yamaha 225 how to make faster?

[stratos200vt]

I been looking on the board on scream and fly on how to make my 1987 yamaha 225 2.6 faster. I seen where you can by reeds, light weight flywheel, light cowling, exhaust tuner, and on and on. Will this stuff help out enough to tell the difference? I am new to stuff and need all the opinons i can get. The motor is very strong and pushes my 200vt in the low 80s but wanting to do more....Thanks.:smiletest:

[ChrisCarsonMarine]

reeds and tuner will improve accelleration,compression helps too...reeds and
compression are easiest,noticeably difference,chris
BTW we can cut your heads,and have your reeds...

[Markus]

I been looking on the board on scream and fly on how to make my 1987 yamaha 225 2.6 faster. I seen where you can by reeds, light weight flywheel, light cowling, exhaust tuner, and on and on. Will this stuff help out enough to tell the difference?

Reeds: No
Flywheel: No
Cowling: No
Tuner: Maybe, but you can probably just as well cut the one you have, and you risk losing bottom end.

The 225 Excel has some of the best heads of any Yamaha V6, but you can still increase compression by cutting them.

Big gains would come from porting.

With different porting, you could make use of 36 mm carbs.

[ChrisCarsonMarine]

I've installed our glass reeds in several excells,not making claims for top end gains,but assure better idle and accelleration,noticeable improvement.Porting work will certainly achieve the most gains at top end,but at the loss of torque and low end effeciency and the engine has to be completely torn down to do it....something to consider when the motor needs to be rebuilt,if top end is what you want.The heads and reeds can be done in an afternoon,at minimal cost,and you'll feel you got more than your moneys worth in overall performance improvement,and you may see a little top end as well,chris:thumbsup:

[scc82]

Reeds: No
Flywheel: No
Cowling: No
Tuner: Maybe, but you can probably just as well cut the one you have, and you risk losing bottom end.

The 225 Excel has some of the best heads of any Yamaha V6, but you can still increase compression by cutting them.

Big gains would come from porting.

With different porting, you could make use of 36 mm carbs.
reeds will most definatly make a noticible difference in that yamaha.

we have done more testing on reeds then anybody out there i can promise you that. and i have found that yamahas get the most noticible gains every where from our reeds. you obviously have not tried them in a 225 yamaha or you would know this as well.

stan carson

[DoktorC]

reeds will most definatly make a noticible difference in that yamaha.

we have done more testing on reeds then anybody out there i can promise you that. and i have found that yamahas get the most noticible gains every where from our reeds. you obviously have not tried them in a 225 yamaha or you would know this as well.

stan carson

Are we talking topend gains here?

[jphii]

Are we talking topend gains here?


I've installed our glass reeds in several excells,not making claims for top end gains,but assure better idle and accelleration,noticeable improvement.

:thumbsup:

[Markus]

reeds will most definatly make a noticible difference in that yamaha.

we have done more testing on reeds then anybody out there i can promise you that. and i have found that yamahas get the most noticible gains every where from our reeds. you obviously have not tried them in a 225 yamaha or you would know this as well.

stan carson

No, I have never tried your reeds in any engine. My current reed of choice is TDR.

We have tried a number of other reeds in vertical and horizontal front half V6Yamahas (L&S, Boyesen, MAD, home made in various thicknesses).

With the exception of some of our home made reeds that were too thick to open fully, we have not seen any top-end performance difference, or felt any seat-of-pants bottom-end difference.

What kind gains have you seen?

[DoktorC]

:thumbsup:

I was wondering since the two guys are obviously from the same shop (maybe one hand didn't know what the other was up too lol)...

It's pretty difficult to gain top end buy just replacing one reed for another...since the hole is the same size... and Stratos seems more concerned with top end.

[aaronmt73]

Assuming this is an excel.Send your heads to Bottman.Jet it up a bit.The tuner you have is the best factory yamaha tuner so its fine.You can modify your airbox a bit.You already preety much the best of yamaha performance parts.You cant do some work on the front half including stuffing the front half and cleaning up the front intake.Its showuld be a horizontal fron if its an excel,if its not you need to to switch it to one.Yamaha reeds are very good,but for safety reason switch to others is a big plus as well as the can be a bit crisper,Id go with Carson or TDR.You also need to decomputerize it which will allow you to add timing as well as eliminate the rev limiter.Ray Neudecker is incredibily helpfull im sure he will chimein.The mods I have said will change the motor completly with lil effort.Aaron

[stokernick]

doesn't Wayne Worthy do all the ''mods'' on Yamahas ??

[Dingie 2]

220 special heads and tuner may be as good as it gets. I think the 220 special head is about the max compression that you can run on 92 or 93 octane pump fuel. with 28 timing. Joe R

[scc82]

ask tony brucato if he got any gains with our reeds in a yamaha 225.

and yes i am stan carson, chris carson's son, and have tested more reeds than most people have ever seen, not braggin, just the facts.:thumbsup:

[DoktorC]

ask tony brucato if he got any gains with our reeds in a yamaha 225.

and yes i am stan carson, chris carson's son, and have tested more reeds than most people have ever seen, not braggin, just the facts.:thumbsup:

We don't need to ask Tony...we can ask you lol.

What gains have you seen? Personally I'm 100% focused on top end improvement.

[Markus]

ask tony brucato if he got any gains with our reeds in a yamaha 225.

and yes i am stan carson, chris carson's son, and have tested more reeds than most people have ever seen, not braggin, just the facts.:thumbsup:

Show us the numbers!

[stratos200vt]

I mostly want more top end. So there's a bunch of different options. How do i decomputerize it? I just getting into speed boating and dont know much bout engines and building them or anything. So I prob need alot more help than most.lol.

[whatsamerc??]

talk to ray. he has talked me out of spending money several times when i had sense enough to listen. i think reeds are more of a safety factor than anything. not much gain from the tuner. the light flywheel might help with harmonics. the light cowl couldnt hurt but its expensive. i think the intake mod for one of those is good for about 5 hp. old style electronics are the best, dont know if the decomputer kit is still around. other than that porting is your best bet for any real gain. ccm, when yall cut the heads do you rework the squish area? if you do,how much to cut a set?.................benji

[David]

If you are just getting into performance boating it's best to work on set up first, before going for more power.

Sometimes a faster boat is easier than a more powerful motor. I picked up around 15 mph by switching boats with the same motor.

[aaronmt73]

No need to change the cowl the excel style is as light as it gets for factory yammie cowls.

[Markus]

No need to change the cowl the excel style is as light as it gets for factory yammie cowls.

Yep. The have become a lot heavier (and quiter) since. The Hydro Tec race cowls are still lighter, but I would not bother....

[DoktorC]

Yep. The have become a lot heavier (and quiter) since. The Hydro Tec race cowls are still lighter, but I would not bother....

The new (2000+) hpdi hoods are the lightest. I run one and it's 1/3 of the weight of my stock hood (91)...but only slightly lighter then that excel/prov hood. It's not worth anything performance wise but it updates the look.

[espen]

Yamaha engineers where involved at a point to make a 260 yamaha.
If my memory serves me right the major thing was porting, the small ports where rised gradualy more and the back port about 1 mm more than the closest part to the exhaust port. The exhaust hight and witdh and ports where rised 1,5 -2 mm . They made a big V of the rod slot . carbs where bored off center to a flat floor to about 36. Yamaha made a 2 " shorter exhaust tube with a steaper angle maybe 8deg and it was copied by Hydrotec for sale to public.You could cut the oem exhaust 2 " and I think I remember the gain was reported from Yamaha to be 1,5hp over 5000rpm. The mid was opened and the can was taken out of the mid, cut the holder of the water tube free from the can , makes the engine sound real nice ;-) and some boaters clamed increases like 5mph from this mod. Read stoppers where cut so just 1/3 left of it.
I used to port the read cages because the transition from roof to reed is not smooth. I think the back plate is pretty restrictive to and I know there was one plate made that made the runners inside bigger inside for high rpm use. Later they made special long rods that look like the 260 merc rods and a shorter piston to make the piston stay longer at bottom and top for increased porting time and increased combustion time. They changed the computer stuff to 150-200hp electrics and a special cam was made to pull the ignition and carbs right, a stopper was also made. To cut the Yamaha heads is not as easy as on the mercs , it has to have the squish bands in a curve like the piston , one thing we did once was to TIG weld equal amount alu rods into the combustion camber , this worked great . During the days of the early 90s the tuned Yamahas where much more reliable than the 2.4 EFI mercurys but slower than the 2.5 Efis in offshore racing. Lower unit, especialy the carrier and shaft where weak points and they where snapping so easily that they made less dia like 13 3/4 inch props to lessen the stress on the main shaft. They also made it thinner to absorb the peak torque.

[wildcatt]

Interesting discussion guys.

I have an 88 Excel. Totally stock. Not really looking to do much as I'm pretty happy with it overall, but I am interested in the History of the Excel.
Was it designed to be race type engine, high performance etc.
I've heard that it's lighter than others?

Any other tidbits of information?

The stuffing sounds interesting. Any tips on that?

thx

Tom!

[whatsamerc??]

The new (2000+) hpdi hoods are the lightest. I run one and it's 1/3 of the weight of my stock hood (91)...but only slightly lighter then that excel/prov hood. It's not worth anything performance wise but it updates the look.

do you have a good pic of your cowl? what motor and year did it come from?


espn, do you have a pic of the cut tuner? which one of hydrotechs is it? ...............thanks benji

[espen]

Sorry I have not any picture of the tuner, but its very easy , just cut of 2" of the end of the tuner ,you have to keep the unequal length offcorse.
Take the can out of the mid and cut of the part of the can that has the bolt holes for holding the watertube from the loverunit.
I forgot one thing ...the 260 Yamaha had offset combustion cambers, like the 250 (YT) roadracing 2 stroke engine , it was to take some of the combustion heat away from the part of the piston close to exhaust port.

[Markus]

do you have a good pic of your cowl? what motor and year did it come from?


espn, do you have a pic of the cut tuner? which one of hydrotechs is it? ...............thanks benji

It is not the megaphone. It is a short piece. But you can just as well cut a stock tuner.

[Markus]

I think the back plate is pretty restrictive to and I know there was one plate made that made the runners inside bigger inside for high rpm use.

Wayne Taylor made one.

[DoktorC]

do you have a good pic of your cowl? what motor and year did it come from?


It's the standard 2000+ Vmax HPDI cowl. The new 3.3 stuff is light too.

http://i37.tinypic.com/2rgnn78.jpg

[whatsamerc??]

i believe i like that one better than my hydrotech one. gonna have to see if i can come up with one..........benji

[stratos200vt]

I also wandering about drilling holes for the exhaust. I heard it helps then i also heard it hurts you? So which is it. My props always got bunch of smut on it. Friends boat has exhaust holes and not nearly the smut on his prop. I seen a bunch of boats have 2 pee holes. Does that help or that just for looks? Thanks.

[hydro]

Come on Ray Nuedecker !!!

[87gtNOS]

Hey guys, I am looking for 225 or 200 heads for my 97 ProV 150.
Anyone got any for sale? I have asked Ray, so if he hasn't anything, then I'll be looking!


Also, as DoktorC says, the newer hoods are very light! We had his hood and my 97 hood on the dock the other day and my hood is WAY heavier!! Our other buddy has a 08 300 HPDI and his hood is VERY light also!

I installed the 89 Excell tuner in my 97 150. Espen, are you saying that we would need to cut 'another' 2" off this small tuner? I have included a picture of the two tuners....stock 97 Prov150/175/200 and the Excell unit!


My email is [email protected]

Thanks


http://img195.imageshack.us/img195/5626/motorwork1.jpg

[jkassu]

Hello Guys,i need more power.
i have 175hv yamaha 1985 with 225 excel heads and carbs,exhaust ports are 225 specs.
Horizontal and vertical reeds,what's To difference?Dyno specs?

[Markus]

Have not seem dyno specs, but the 225 Excel got the horizontal reeds when it replaced the 220 Special.

They could not make enough power with reasonable compression with the vertical reeds.

The horizontal setup has much more reed area.