1986 60hp johnson

[netting one]

after many new parts my buddy calls says hes on the water and boat wont go over 5 mph! ran fine all summer then this. he made my a video and sounded good no missing. god it in and did compression test top cyl 110 middle cyl 80 bottom cyl 110 could this cause the boat only to do 5 mph? put muffs on it in driveway and seems to run fine and revs up good? parts list plugs,wires,coils,stator,power pack,starter,fuel pump(non vro) i think thats it. thanks

 

[GA_Boater]

As has been said here many times - Running on muffs means nothing without a load on the prop.

None of the parts listed will fix the compression on #2. Gonna have to dive in and see what's up.

 

[racerone]

Take cylinder head off for inspection.----Could be a bad head gasket.-----I doubt he or you will like what you see when the head is off.-------This sounds expensive to me !

 

[Bosunsmate]

Ask him what he was up to before it went down to 5 mph
Rebore and new rings, if you do it yourself, easy job its not that pricey, a couple of hundred or so. Need to work out what happened, impellor, oil, running lean, pin in the piston to stop ring rotating falling out came out etc

 

[netting one]

i was also thinking that 30 lb was going be a problem. said he was out fishing went to start up and that was it. seems od that only 5 mph thanks guys after all the money on those new parts i hate to tell him this. he did say he put a new tank of fuel in maybe he didnt mix right or at all? it smokes pretty good now but that could be the blow by after burnt the rings up? thanks again

 

[racerone]

I doubt smoke is caused by " blow by " on the rings of a 2 stroke motor

 

[Bosunsmate]

yep 5mph does seem low, its not like that cylinders on zero
It could also be flooding a cylinder from a malfunctioning float/valve

 

[netting one]

are you talking carb problems or in the motor?

 

[racerone]

Just 18 bolts to remove cylinder head to do an inspection.-----That is the next step on this motor -----This sounds like it might need some $$$$ to correct.

 

[Bosunsmate]

are you talking carb problems or in the motor?

Carb, but if not that then id suggest doing as ^