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Thread: 300hp johnson?
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08-31-2006, 09:05 PM #1
300hp johnson?
I'm buying an older Checkmate with a 300 Johnson on it.Anybody with any imput,good or bad? Thanks JBS
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08-31-2006, 10:26 PM #2
Mota is junk. They suck!
Get a Merc!!!!!!!!!!!!
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08-31-2006, 10:34 PM #3
300 Johnson
JBS, Buy the boat and contact me regarding the sale of the Johnson. I have several and many Mercs!!! Just ain't no substitue for CUBIC INCHES!!!!!!.
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09-01-2006, 06:11 AM #45000 RPM
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I have had several of those motors and the only problem i ever had with them is if it is eqipped with twin VRO pumps premix you fuel. the VRO pumps work well as fuel pumps but not so good as fuel oil mixing pumps like they should. Other than that there strong motors.
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09-01-2006, 09:19 AM #56000 RPM
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Johnson 300
Lot's of torque, thats for sure. They also are very thirsty. AirRide
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09-01-2006, 01:38 PM #6
As long as you feed it enough it will run good.
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09-01-2006, 01:47 PM #7
v8 john rudes are some of the best motors they ever made, IMO... As long as you can afford to feed them. LOL.
> Stainless steel Merc cowling plates - $110 shipped TYD - LINK <
1979 16' Action Marine/2.5L Merc S3000 - Metalflake Maniac
1984 18' Contender Tunnel/2.4 Merc Bridgeport
"Where does the love of God go, when the waves turn the minutes to hours?"
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09-01-2006, 02:09 PM #8
Give it to the right guy.....,
hand him a die grinder and come back in an hour.
Maybe the only motor on the planet that will make 400 HP's on pump gas. Some of them have porting from the factory capable of 8K R's.
Do your home work before you **** can it based on what the experts are telling you.
They are very heavy and used to be wayyy out there but not anymore! Almost all the direct injected 225+'s are 550 lbs or more. That by the way is the same weight as a V-8
One last thing to consider is...........if the rumors of a V-8 E-Tech are real (I would never say such a thing) all of a sudden you have the basis of one Bad Mammer JammerLast edited by Instigator; 09-01-2006 at 02:35 PM.
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09-01-2006, 02:45 PM #9
I owned a 41' Corsa w/triple 300GT Junkson .............I meen Johnson engines back in the day, sure the tork was unbelievable.........I emphasize"was", cause they suffered overheating & the VRO pumps sucked, & could'nt keep alive for long.
V.R.O. STANDS FOR V. ery R. isky O. peration !!!!!! Just research their track record ! How long were they around? Man save yourself the grief! If someone comes claiming those engines are great, offer to sell it to them and see if they put their $$$$$ where their mouth is! Not being a hater just keeping it real. That was my personal opinion, backed up by the bad experience I went through. There ain't nothing like a MERCURY ........... MERC4LIFE!!!!!!!!!!!!!!!!
Peace! FIG
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09-01-2006, 03:22 PM #10
im gonna go get me some popcorn right now.
> Stainless steel Merc cowling plates - $110 shipped TYD - LINK <
1979 16' Action Marine/2.5L Merc S3000 - Metalflake Maniac
1984 18' Contender Tunnel/2.4 Merc Bridgeport
"Where does the love of God go, when the waves turn the minutes to hours?"
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09-01-2006, 03:35 PM #115000 RPM
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The ignition is weak and the carbs are bad but at the end of the day the lower unit is the show stopper if you want speed.Mine burned 50% more gas at 90 than a 300promax on the same boat.
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09-01-2006, 04:04 PM #12
last post on this thread for me but...
FYI, V-8's had the same ignition, same carbs, and same VRO pumps as the V-4's and 6's that are still running every where.
I've run the 4's and 6's since the 80's and NEVER lost a VRO, carb and have only replaced one stator (not sure that was even the problem) on one motor that entire time.
The FrankenRude (V-6 looper) ran those same junk carbs and ignition and with the rev limiter removed (box freagin stock ignition and carbs) turned 8500. (I'll buy all the early junk V-8 carbs you guys can come up with!)
I have a friend running a V-8 on a 22' Talon that is running just a tick under 100 @ 7K + w/a near stock motor.
Another friend w/a 25' Action Center Console w/twin V-8's that has also been near 100 depending on state of tune.
He's had that boat and those motors for I think at least ten yrs. And motors have been together for a long ass time!
I was down here last Spring and picked up an '84 I think (one of the first yrs), V-8 from a scrap pile.
I took it home, pulled off all the butchered up wiring (from a previous life), ran fuel to it and jumped it while it was laying on it's side on the trailer.
It started!
My buddy w/the Talon has that motor now and I saw it dissasembled at the Rumble last month. The entire power head could pass as new!
He only opened it up to add 100 or so extra HP's.
Most people that bad mouth them either got one that had already been screwed with by someone that didn't know what they were doing or never gave them a chance. (how many people can sink 8 carbs??that's all it takes to make em run like ****!)
So again, you guys with all the bad experience and wealth of knowledge with these things remember I'll do you a favor and take all the junk you have laying around! You're right, they're all crap!
Thats why they only built them for what?? 10 or 12 years?
The guy just asked for help.Last edited by Instigator; 09-01-2006 at 04:09 PM.
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09-01-2006, 04:09 PM #13
John rudes just SUCK!!!!!!!!!!!!!! Nuff said
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09-01-2006, 04:40 PM #14Originally Posted by Little Jon20 SHADOW 300+ V8
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09-01-2006, 05:30 PM #15
v-8 omc
I enjoyed my 235 cross-flow on a 20 Vegas,then I bought a V-8 on a 21 Daytona.I rowed back more than I rode back.No bull$hit,V-8 omc is straight up junk!!!!Oh yeah,it was fast as **** but was broke all the time.Switched to the BLACK ATTACK and have never looked back.PRO MAX MERC made my boating fun instead of fuked.