no top end power under load.

[biggary]

ive got a 4hp 2 stroke, all was going well till i killed the water pump and over heated it. since then ive replaced the rings head gasket, water pump, all the gaskets, but it wont rev its head off when its pushing the boat, but in netrual and revers its fine and goes the hole hog. ive got new reeds comeing but if thats not it then im stumbed, anyone eles had this problem with there 2 stroke?

 

[WillyBWright]

Re: no top end power under load.

Had a Yamaha 4Hp once that everything external checked out well after an overheat. Finally I removed the cylinder head and found that the sleeve had rotated partially in the block and the ports weren't aligned anymore. Otherwise it survived the overheat just fine. Not sure if that's possible on your motor.

 

[biggary]

Re: no top end power under load.

wow, that somthing i havnt heard of <br />just checked it and you rock, it has<br />what did you do to get it back in line

 

[WillyBWright]

Re: no top end power under load.

The customer didn't want to spend the money. But I would have had to disassemble it and put the block in an oven. Once it's heated, the sleeve should turn. I don't know what the temp would need to be. Start at 120C and work your way up. Using a torch wouldn't work. The heat has to be even and the best way to do that is in an oven. You might want to send the wife out shopping before she catches you doing that to her stove.

 

[biggary]

Re: no top end power under load.

lol, the man at the motor shop said 260dc in the oven.<br />good thing i dont have a girl then <br />thanks for that ( i owe you a beer next time your in new zealand )

 

[Clams Canino]

Re: no top end power under load.

For good overkill heat it to 300 and try to take the sleeve OUT. Then cool the just sleeve and use Locktite sleeve retainer on the sleeve and drop it back in the right place.<br /><br />-W