V4 Yamaha hot ups

[Bullshot]

I am about to build a 140 yamaha to go on a 14'6" tunnel deck circuit race boat. i have only ever done Merc stuff before so am lookin for any info on port heights and head cc,s. Also any other tips such as how to get rid of the rev limiter. I can use either the old screw in power pack or the later cdi unit. I work for a Yamaha o/b wrecker so parts are not a problem.Also who makes velocity stack,s?Hot up parts for these engines are not available in Australia so any help would be apreciated.:D
Bullshot Racing

[berg969]

on the later cdi you can just snip the gray wire that comes out and goes back in.

also if you can put one of the horizontal intakes from a 225 on with some mods and swap to a v6 200-225 exhaust

[Bullshot]

Thanks for the reply. I,m sure there are more people out there with some knowledge of how to get these things to go.Any more help??

[Hero]

talk to hydrotecmarine.com ([email protected])
maybe they can help

[Bullshot]

Come on guys, some one must know how to get these things going. Surely there are some fast v4 Yamahas out there:confused:

[Bullshot]

Thanks for the reply. I have had a look at Hydro techs web site so I at least have a place to start. Still looking for help with port heights?

[mackeral5]

bullshot- if you'll search the archives you'll find a good bit of info on yammie v4 mods. you likely won't find much on specific port timing and cc'ing of heads but you will find a good bit of info.

since you are modding a 140, some of the info may not apply---I'm not sure of the 140 specs. most info applies to folks with 115's and 130's.

I had a 2002 115 with most all bolt-on mods pushing a 2800-3000lb (1950 dry hull weight+ all rigging, 47 gallons of fuel, etc.) center console 48mph, with an all time best of 49.5. No grinding on the block, just a few bolt on mods. bone stock the boat would only run 42-43mph. My neighbor that lives by the no wake bouy in my slough swears the v4 left harder than the v6 that is on it now. I'm not really sure about that but that's what he says:D

I hope to put the v4 on a light boat someday to see what it will really do. max speed without sacrificing holeshot only produced about 6300-6400 rpm due to the v4 running out of torque and a heavy hull. On a light hull where you could spin it upwards of 7K it should surprise a lot of people that underestimate the v4 cowl.

good luck with your project and please keep us up to date.

[Bullshot]

This the boat I am setting up for the Yammy.

[Markus]

Give Wayne Taylor (MADEFI) a call. He has built some big hp V4s.

[Bullshot]

I have my block ready to port. i am using a current model 130 bored to 20" o/size. I am going to match port the pistons and machine the block to zero deck height. I have checked out the rear exhaust plate and have found that the old 140 plate is much better in design(flow) than the 130 plate. Also got 140 heads which have a lot smaller combustion chamber than the 130. Still looking for further tips. :confused:

[soren]

go 2 mm up whit all ports,cut your heads 3mm and use a 225 pipe.you can also make it fingerportet.

[mackeral5]

are you sure about going with a 225 v6 tuner?? I used the hydrotec v6 tuner on a v4 and it hurt performance. this was on a heavy boat, but unless you're turning upwards of 8k on an ultralight boat I'm thinking a v6 tuner will hurt performance.

[Markus]

go 2 mm up whit all ports,cut your heads 3mm and use a 225 pipe.you can also make it fingerportet.

Soren, welcome to S&F.

Guys, listen to what Soren says. He knows his stuff when it comes to Yamahas.

[Markus]

Dingie, have you tried Hardcore Marine?

They have lots of Yamaha parts.

[Bullshot]

----Where are you guys finding 140 heads and exhaust plates ? Can you give the part numbers for them ? What carbs are you guys running on your hot V-4's ? The fastest carb that I have tested so far on my V-4 are the 220 special single bowl 34mm"s . I have the main fuel jets close but haven't come up with a winning combination for the air jets.Have any of you guys run the 220 specials on your v-4's if so what combination is working for you ? Will the 225 tuner bolt on ? Joe R

140 head part no is 6L1-11111-00-94
140 exhaust plate is 6L1-41111-00-9M
I have plenty of exhaust plates but heads are a bit scarce. Havn,t built the engine yet so any carby + jet advice advice will be handy.

2mm up on all ports? inc intake? Thanks for the replies

[Dingie 2]

Bullshot,I have tested a few carbs and narrowed it down to these two. The old original 1986 130 Nikki 34mm 6L101 carbs with 185- 190 main fuel jets and 290 main air have worked great but the 220 special Teiki 34mm carbs 6G700 are 1.5 MPH faster on my rig . These 220 special carbs are the single float type,I have run giant 196mm main fuel jets but dont have them 100% dialed in yet If anyone has run these on a V-4 and could tell me there jet combo it sure would help. ( HINT HINT RAY NUEDECKER). Thanks for the head and exhaust part numbers. Joe Raimondo

[soren]

use cabs from 225 new style ,you can make them 36mm

[Ray Neudecker]

The old model US 130 used the same plate as the 140 European version. It could have legally been called a 140. Yamaha tended to be on the conservative side of the 10% with their HP ratings on their introduction into the American market. I suspect most parts will be the same.
Joe you already know the answer from your own testing on the plates. You may need to go out some on those main jets. Read your plugs and keep going out until it gets too rich.

[Markus]

The old model US 130 used the same plate as the 140 European version.

So, there never was a 140 in the US?

Interesting.

[Ray Neudecker]

There has never been a 140 Hp Yamaha distributed in the US by Yamaha, that was called a 140.

[Dingie 2]

Ray Nuedecker , I had my jets up to .080 or 2.04 and still wasn't to rich. I increased them to 2.16 or .085 and will test it again friday and see what happens. I can't believe how much more fuel I am pushing into the motor with these 220 special carbs. Joe R

[Bullshot]

On the left is the Aus 130 yamaha exhaust plate and on the right is the old Aus 140 plate. It appears to me that the old 140 plate would flow better. Is that the same plate your refering to?I am also going to use the early 140 heads with my build.

[Bullshot]

Finally run the boat with the 130/140 Yamaha. only ended up doing a mild port job/early 140 heads + exhaust. Top speed first time in 73MPH with a 26 laser II at 6000 rpm. also tried a 26 Yam drag prop but only 71MPH at 6500. Boat is being cicuit raced next weekend.

http://i207.photobucket.com/albums/bb238/bullshotvoc/quintrexfishseeker004.jpg

http://i207.photobucket.com/albums/bb238/bullshotvoc/quintrexfishseeker002.jpg

http://i207.photobucket.com/albums/bb238/bullshotvoc/yamawreck001.jpg

[kiaer4me]

Very Cool Pics, nice Mota.

[skeeter ss140]

Hey guys its cool to finally hear of some other guys building yamaha v4s! I run a 1998 115 v4 on my little bass boat, and have had some work done on it. I added 130 carbs with no. 86 jets and a set of boyseen reeds, and added the hydrotec heads they raised my compression to 145 and had the hydrotec hp tuner put in, It really woke my motor up, when it was stock my boat ran 55mph @ 5500rpms. With a 21 pitch prop after the hydrotec stuff and 130 carbs it runs 61.4mph @ 6050 rpms with a 23 pitch prop, and the holeshot went from good to really good! I've been trying to decide between getting a v6 or having hydrotec port my block(they say that they can get 25hp porting it) and try to get all that I can out of my v4 since my boat is only rated for 140hp. So what's the deal with the 225 carbs? I've never heard of them working on the v4s, I'm very interested what year and no. Carbs will work? Also I have the stock 115 heads off of my motor if they will help you, I would give them to you, just give me a pm so we could figure something out for the shipping. I talked with the guys at hydrotec when I was getting my stuff and that's why I got 130 carbs, they offer a big bore carb package but they couldn't do it to my year 115 carbs because if they bored them it would ruin them, something about messing up the accelerator pumps?, I was told to find 130 carbs(and believe me I had a hard time finding 130 carbs) or to find 115s from a 1995 or older, they never told me about the 225 carbs! I would like to give them a try.

[skeeter ss140]

I'm not sure of the tuners no. Its the one that hydrotec sells on their site for the 115\130, I had my local shop install it, I used to be a tech at a chevrolet garage but im no marine tech by along shot lol, So I thought it would be best to leave it to the pros, the no.86 jets that they put in my carbs are the main fuel jets, I guess, the stock ones that were in the 130 carbs were 80s I still have them and the 76s that came out of the 115 carbs and I believe that the 130 carbs I bought are 34mm they were off a late 80s model 130, I am curious how much one of these v4s can make if they were totally tricked out, any idea? The horizontal intake front half sounds interesting what all would that involve? Could or would hydrotec do that mod (I've never heard of it before)or would someone else be better suited for it?

[Dingie 2]

It would involve removing the stock frt half of your V-4 block and installing a cut down / modified V-6 horizonal reed frt have, You also would have a few other things that would have to be changed like the starter mount.This modification would have the reeds lined up behind the carbs,it would flow way better than the way the V-4 flows. It's amazing that I have never seen one for sale. I have been wanting to build one for three years but am still running the stock vertical reed frt half. Hopefully I will have one on my boat this coming year if all goes well. What gains did you see and feel when you changed out your stock 115 tuner for the HT one in the add. it must be the ht5115 tuner that they sell. is that correct. How much does your hull weight ? Some say the short tuner didn't work well on heavier boats. Joe R

[skeeter ss140]

It is the 5115 tuner, I looked it up, I really couldn't say what the tuner did by itself, because I had the heads, carbs, reeds, tuner all of it done at the same time, but the holeshot difference alone was amazing and it didn't have a bad holeshot before, I only gained 6.5mph on top speed but it gets there quick for what it is, my hull is 17.5ft skeeter and it weighs around 1,000lb one of the guys in my bass club has a 18.5ft Stratos with a 150 fast strike on it and he was a little bewildered when my 115 beat him out of the hole all the way to 60, by that time he was around 8 or 9 boat lengths back, after the tournament was over he was scratching his head looking at my boat lol, I'm wanting to get in the 70s in my boat but I'm afraid without getting a v6 I might have a hard time doing it, if I get my v4 ported and do the horizontal intake mods I might be able to, but the front half mod sounds like it would cost a fortune and I already got more money in this boat than I could get out of it, but it looks like new and runs pretty good too, but I'm always gonna want more speed, - unless I strap a 300 drag with nos on it lol! Heck if you build yours and it kicks ass, let me know what it cost to do it, and if you want to do another one I might just hire you to do mine!

[Markus]

The horizontal intake front half sounds interesting what all would that involve? Could or would hydrotec do that mod (I've never heard of it before)or would someone else be better suited for it?

Wayne Taylor supposedly did a few.

[skeeter ss140]

Cool, I thought he was mostly a OMC guy, I would like to know what one of his v4 yamahas put out hp wise, I'd imagine if he built them, they were screamers! Do you know if he had his fuel injection set up on them?

[skeeter ss140]

Hey guys I just asked the main guy at hydrotec about the horizontal intake front half mod for the v4 yamaha and he said that he had seen it done one time but it was a bad job and didn't look good and “he had thought about trying to do it but there we're to many obstacles to do it where it would look and run right ”, this came from the Wayne Worthy at hydrotec, and he is the man when it comes to making yamahas fly! and he has the facility and know how to do it, so I don't think this is a mod for the v4 that is worth messing with right now, maybe in the future it will be, it sounds good in theory I saved the email that he sent me but I can't figure out how to add it on here though, but those were his words. Hope this helps

[Dingie 2]

Skeeter ,wow this is not the same information that I got from Wayne at HT . I have to talk to him this week about another project. I hope that this project didn't get the boot since Wayne and I talked. Joe R

[skeeter ss140]

I emailed hydrotec (Wayne Worthy) and its not a option that they do right now. I'm waiting to hear from the guy (Wayne Taylor) at mad e.f.I to answer a email I sent him asking about if he has done it before and what kind of power it made, how much it would cost etc.

[skeeter ss140]

I saved the email he sent me if you give me you email address I will foward it to you, I don't know what happend either, if hydrotec can't or won't do it??? Kinda make you wonder if its worth trying. Sorry to get off topic here but I got to go pick up a new toy(match shooting .22 rifle) I will check back in after while have a good day guy.

[whatsamerc??]

Hey guys I just asked the main guy at hydrotec about the horizontal intake front half mod for the v4 yamaha and he said that he had seen it done one time but it was a bad job and didn't look good and “he had thought about trying to do it but there we're to many obstacles to do it where it would look and run right ”, this came from the Wayne Worthy at hydrotec, and he is the man when it comes to making yamahas fly! and he has the facility and know how to do it, so I don't think this is a mod for the v4 that is worth messing with right now, maybe in the future it will be, it sounds good in theory I saved the email that he sent me but I can't figure out how to add it on here though, but those were his words. Hope this helps

some body forgot to tell the boys at jacks marine that it wasnt a good idea. jack and wayne taylor were good friends and worked on the horizontal v4 and made it work. it is a shame we dont have either one of them around today to get info from. that little yellow mirage of jacks was bad ass in the odba 120 class. i think jacks son still has a cut down fuel injection system for the v4 but i dont know if he will sell it. i know he still has the boat and motor that they raced but i dout you could get it either. i think that the little motor turned around ten grand also. so it has been done and it did work it just wasnt easy......benji

[Dingie 2]

I have heard from a few, Ray nuedecker was one(he has always been there to try and help ) that Kothman made a few, Both Nathan and Wayne at HT have come thru in the past so maybe after they talk this could happen if not,the boat runs pretty good like it is. You just always would enjoy a little more. This motor you talk about has come up it the past also. Hop someday my flats fishing boat will have one bolted on the back,it would sure be cool. Joe R

[skeeter ss140]

I hope the guys at hydrotec do try to make one and make it available to the public, I'd love to have one turning 10,000rpms on the back of my boat! They want around 3,000 bucks just to port my block and put new rings in, that's parts and labor, so I'd hate to see what a front halfed mota would cost a guy to have built. Probably still be cheaper than buying a new one though.

[Bullshot]

First race day

http://i207.photobucket.com/albums/bb238/bullshotvoc/0045_glenmaggie_19_10_20081.jpg

[Dingie 2]

First race day

http://i207.photobucket.com/albums/bb238/bullshotvoc/0045_glenmaggie_19_10_20081.jpg That's one good lookin boat/motor don't be afraid to share your V-4 Yamaha secrets with the few of us that lave running these motors . Joe R

[Bullshot]

Another race day. Yamaha still going strong.
http://i207.photobucket.com/albums/bb238/bullshotvoc/yamawreck.jpg

[Dingie 2]

Wow that is one good looking ride. I am so glade that the V-4 is hanging in there. How many RPM are you turning and for how long are you holding it there ? What flywheel are you running ? Joe R:thumbsup:

[Jason Johnson]

Bob Kottman, Nixa MO. No one in the United States of America builds a stronger V4 Yamaha. 314-731-3430, 636-338-4080

[Bullshot]

Hi all, we are running a 26P laser two @ 6000 rpm, Havn,t cut the rev limiter or played engine height yet as the driver is still learning.130 with fibre reeds, 140 exhaust plate and heads and light port clean up. Std flywheel, nose cone on gearbox. used for circuit racing 4 laps approx 5 minutes a race, and drags:thumbsup:

[Bullshot]

http://i207.photobucket.com/albums/bb238/bullshotvoc/dancrafthume.jpg

[soren]

http://i207.photobucket.com/albums/bb238/bullshotvoc/dancrafthume.jpg

the fronthalf is made from a 225 or pro`v 200,base is too cut number 3 and 4 out,weld,milling it and then line bore it.


soren

[Dingie 2]

the fronthalf is made from a 225 or pro`v 200,base is too cut number 3 and 4 out,weld,milling it and then line bore it.


sorenAre you saying that your are running a 225 frt horizonal reed front half on your motor ? If so when you get time can you send a couple pics to my E mail? [email protected]

[soren]

[Quote = Dingie 2; 1.815.976] Siger du, at dine kører en 225 FRT horizonal reed foran halvdelen på din motor? Hvis det er tilfældet, når du får tid, kan du sende et par billeder til min e-mails? [EMAIL = "[email protected]"] [email protected] [/ email] [/ QUOTE]

no,only saying how to do it
soren

[mcyama]

sketter ss 140, I have built and run a horizonal front on a v4 yammi, yes there was a slight improvment at wot. It is not worth building for the gains you will receive. the intake trec is to long. I had to change gear ratio and run 200 psi. the 1.7 litre and 2.6 litre yammi's crankcase will only build hp (on a Land and Sea dyno) to appx. 7500 rpm. the transfer volume is not there. reguardless of boost or transfer timing. you would have to go behind the sleeves thanks martin conrad

[Dingie 2]

mcyama what are you calling small WOT gains ? 2-3 hundred RPM ? Are you talking less than that ? Did you try moving the reeds closer and stuffing the intake to the max with the horizonal front that should help air speed ? I am very interested in this mod but have not seen one. Do you think that finger porting is a better mod for the v-4 than changing frt halfs ? Have you done both ? Joe Raimondo

[mcyama]

Dingie 2, yes I have reduced crankcase volume in the front half,using marine tex. if you look at a yammi 2.6 litre front half there are major volume differences in them. the reduction does help,across the band.(very small step foward). yes, i have run finger ports in my 1.7l since 1984. (ANOTHER SMALL STEP FOWARD). what ever you drream up to deliver more air into the cylinder is a good thing. the crankcase in the stock form will not deliver the air required to build a fire breathing dragon. you must go behind the liners to create the dragon. Dingie,you did touch on one very good point -air speed- but you to add volume. Always remember pressure is power BUT volume is speed. This unit would create 162 hp at 7900 rpm. Using a land and sea dyno.

[Dingie 2]

mcyama, it looks to me that I have just about done everything that I can to my V-4 combo mounted on a 850 lb hull. Not a light racing hull a shallow water flats fishing hull. My # 1 Yamaha Guru told me that it may be time to look for a V-6 power head ,that the V-6 would most likely last longer and be less expensive than any further V-4 work.

[mcyama]

well dingie 2 -yeeeaaa- there are no subsitutes for cubic inches. If the boat you have is safe to operate and does comply with state regulations then go for it . Itotally agree with your tech. The 1.7l yammi comes in at 348 pounds, a 2.6l add another 100. Have a happy Thanksgiving. It's been a pleasure working with you. martin conrad

[Dingie 2]

IM at the max HP IAW the coast guard plate. I have time to save up for a project motor . No hurry because I have a fresh power head -all new bearings-just had Hydro Tec bored .020 installed new wiseco pistons,new rods, so I have time to save. I really dont want to add any additional lbs. or draft to my shallow water fishing boat. I would love to get another 3MPH out of this rig. Always open to ideas. Joe R

[mackeral5]

joe, take a look at benji's tube port post.....that may be a way to get another couple mph out of your rig. I'll donate the block/front half, you just pay shipping. no joke.

[mcyama]

DINGIE2. Did you have to go with Wiseco pistons? I never had much good luck with them,except when I needed to go 0.60 over. Yamaha offers a 25mm and 50mm also the same manuf. for yamaha is at pro with a 100 over. If all you want is 3 mph then dump the expansion or reflection type tuner tou have and install a 1984 115hp pipe,plate and exhaust guide. Never take the CAN out you will loose hp. you will loose a little on bottom but it pulls real hard on top. make sure you have thermo's installed. Martin Conrad

[Dingie 2]

DINGIE2. Did you have to go with Wiseco pistons? I never had much good luck with them,except when I needed to go 0.60 over. Yamaha offers a 25mm and 50mm also the same manuf. for yamaha is at pro with a 100 over. If all you want is 3 mph then dump the expansion or reflection type tuner tou have and install a 1984 115hp pipe,plate and exhaust guide. Never take the CAN out you will loose hp. you will loose a little on bottom but it pulls real hard on top. make sure you have thermo's installed. Martin Conrad -- I played with a few tuners none really made any seat of the paints gains, I found a picture of the straight tuner that your talking about, Do you have any or all of these old 115 exhaust parts that you are talking about. Joe R

[mcyama]

yea man , could proberly go either way new or used. used only if bolts will come out. thanks martin conrad

[Dingie 2]

I sent you a couple Private Messages. If you have a tuner like your talking about I would be interested in it. Joe R

[Bullshot]

Yamawreck V4 still running and doing well. The competion was getting faster so we increased engine height by an inch. GPS speed 77.7MPH @ 6100 rpm still with a 26P laser 2.
I now have a spare powerhead waiting for a rebuild. Still looking for some porting specs. head cc's and carby improvments for next season..

[Mr. Demeanor]

I also have a V4 Yamaha 130 that came with the little boat i recently purchased. I have been following your thread and a few others. The engine had some issues that I now have resolved but in the process I made some small modifications since it was apart anyway. Because it wasn't running right I really don't have any before and after comparisons.
I pulled the carbs and intake in order to replace the reeds with Chris Carson Sportsman reeds. I had removed the oil injections system to save weight in the boat. When I pulled the intake I removed the oil injection ports by pulling them out with pliers. I tapped the holes and put in screws to block off the holes. I then went to work cleaning up the intake. Nothing much, just removing the rough casting edges and smoothing out the flow a bit. I ground the screws I used to plug the oil ports flush. There is also about a 1/8" lip in the intake that stick out in front of the reed cages that I removed.
I cleaned up the reed cages. There was some excess rubber inside the ports under the reeds from casting. When I put the reed cages back in, I noticed the gaskets stuck out a little in front of the cages where I had removed that 1/8" lip so I went back in with an exacto knife and trimmed it flush after they were installed in the intake.
All in all, I picked up about 250 rpm but there were carb issues I fixed at the same time so its hard telling what made the improvement. It probably helped a little and it only took a little time.
Thinking about heads eventually. Easy cheap HP.

[Mr. Demeanor]

Bump for a good old thread.