Problem with 70hp 2000 model Johnson no compression in 2 cyclinders

A

antsaccount01

Recruit
Joined
May 6, 2011
Messages
1
Replaced powerpack, regulator compression on top cylinder of 60 bottom cylinders 0 and 0 have been told this may be a stuck valve the manual talks about head gasket being gone does anyone know whats wrong motor has been sitting for a year but before it did sit it was playing up on its last trip you had to keep revs up to get it home? please help
 
D

daselbee

Commander
Joined
Jan 20, 2009
Messages
2,765
Re: Problem with 70hp 2000 model Johnson no compression in 2 cyclinders

Who ever is telling you "stuck valve" doesn't know what he is talking about.
Two stroke motors do not have valves.

At minimum, if you are truly doing the compression test right, you have to pull the head to inspect the cylinder walls and pistons.
 
JB

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Problem with 70hp 2000 model Johnson no compression in 2 cyclinders

Howdy, ants.

Welcome to iboats. :)

I agree that you need to remove the head, but I think it is much more likely that you have a blown head gasket. Easy fix.

Good luck. :)
 
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