Thread: motor recarb or replacement advice

in my opinion if i had the $5500.00 to replace the motor that would be the way to go cause you will have a warranty with a new motor

How many carbs that thing got? I just had a carb replaced with a used one, but was told they cost $300 new (Johnson 50 hp 2 stroke).

Brett,have you got more than one quote??If you know the mechanic,ask him the question about the 50lbs compression.Iam unsure about four strokes but I do know that is very low compression for a two stroke motor.(the four strokes may run lower compression though).I havent used this guy but I hear a lot of good talk of him,out towards the reservation/reservation road area.Johnny Gardner is his name,,JG boat repair I"think" is the business name..I have a friend that really like him.He's sorta up in your neck of the woods.I work with a guy who father is a boat mechanic,and his son does a good bit of boat mechanicing also.I will ask him tomorrow at work about your questions and reply back tomorrow...sam

yamaha has the highest price kits on the market those kits normally run over a 100.00 a piece.. I purchased a ultra sonic cleaner and ill do that job around 450.00 also make sure you open throttle wide open open to do compression test..

Gabo,
4 carbs, one is bad but they said to do them all while in there, this is a 4 stroke motor

BearClaw, I did talk to the guys and I think they are pretty honest with me, they said the compression was low but OK since all four cylinders were the same, one quote, 4 stroke is higher compression than 2 stroke, should be 110-140?

Boatman, are you saying you'll do the repair for 450.00? Yes, the Yamaha kits are very expensive. PM me i about repairing the carbs. I didn't do the compression test, they did.

thanks to all you guys,

a 50 horse 4 stroke with 4 carbs a 50 horse 2 sroke has 2 carbs 3 if a 3cycl man thats nut i think if i was you i would be looking a the evinrude e tecs or a late model 2 stroke

brettw
Something just doesn't sound right about what they're telling you. I'm not a marine mechanic but have pulled a few wrenches in my long life time. The two things that to me that don't go hand in hand is the 50 pounds and needing a carb job. You may need a carb job, but if your compression is 50 pounds that isn't going to help your problem.. An engine with 50 pounds of compression isn't going to hardly crank and run. I have a true shiop manual for my F40 and the min compression is listed at 175 pounds and thats taken with all the plugs out and with the butterflys wide open. I went down that road early on with my F40 with threes carbs and the cost was about $175 to get them cleaned. My shop manual show just a standard looking carb on the inside, but my guy said that they do have some real small passageways that take a littl more effert to make sure there are open... With 50 pounds on all cyl, make me wonder if that was a valid test or has maybe a gasket gone bad and has all the cys open to each other.. Have you run low on oil and wasted the inside of the motor and burnt up the rings. If that engine really had 50 pound on all the cyls, that's a major problem, if it's just a carb problem that is altogether another problem and not that bad. I've never had to replace a carb, most everything is replacable in them. I wish you were here in the center of the state, I could put you in touch with who I think is one of the best yamaha guys around. Fixing those carbs isn't going to fix an 50 pound problem. I think that I may have a F50 CD here, if I can find it, I'll see if I can come up mith some better information fpr you.
Gerald K4NHN
Cayce, SC

I hope I'm not muddying up your puddle here, but I've never in my life paid for Carb work.
Those things are just too simple.

Maybe your the guy who cannot do his own work, so you have to pay, but the first place I'd look is the low compression.

What exactly do you see or experience that makes it seem like it needs all that work done on the Carbs?

Sometimes, leaky intake valves cause back firing in the intake manifold which will sometimes cause Carbon or partly burned fuel to plug up passage ways and Jets in the Carb. Also if your carbs have sensitive synthetic rubber parts, the leaking intake valves will cause you some serious trouble.

If it were me in your place, I'd look into that Compression problem first!