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 20 hp loss compression 
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MMT Pro Member

Joined: Sat Apr 06, 2013 12:07 am
Posts: 487
Location: port barre,la
Post 20 hp loss compression
Hunted saturday and my go devil ran like a dream. Sunday I launched and it wouldnt start. Got it started for like 2 min and died and never started again. Normally the compression is so hard that if u pull in the wrong spot it will rip ur arm off. Sunday I could pull and pull with no kick back. Anything I should check first thats easy before I completely rebuild the engine?

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25 yamaha pushing a 1642 welded flat
20 hp go-devil longtail for hunting
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Mon Dec 23, 2013 11:53 pm
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MMT Pro Member

Joined: Sat Apr 06, 2013 12:07 am
Posts: 487
Location: port barre,la
Post Re: 20 hp loss compression
20 horse vanguard is what it is.

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25 yamaha pushing a 1642 welded flat
20 hp go-devil longtail for hunting
.


Mon Dec 23, 2013 11:53 pm
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MMT Member

Joined: Thu Oct 11, 2012 3:08 pm
Posts: 42
Post Re: 20 hp loss compression
Check the valves sounds like rockers they just need adjusting.


Tue Dec 24, 2013 7:34 am
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MMT Pro Member

Joined: Sat Apr 06, 2013 12:07 am
Posts: 487
Location: port barre,la
Post Re: 20 hp loss compression
I figured I might have broke a valve spring or something. Gonna check it out

_________________
25 yamaha pushing a 1642 welded flat
20 hp go-devil longtail for hunting
.


Tue Dec 24, 2013 10:50 am
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MMT Pro Member

Joined: Sat Apr 06, 2013 12:07 am
Posts: 487
Location: port barre,la
Post Re: 20 hp loss compression
Found out a pushrod had come off the rocker arm. What could be the causes of this? Does it just happen some time?

_________________
25 yamaha pushing a 1642 welded flat
20 hp go-devil longtail for hunting
.


Thu Dec 26, 2013 3:10 pm
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MMT 1000 Club

Joined: Thu Dec 29, 2011 10:46 pm
Posts: 2342
Location: Mandeville, LA
Post Re: 20 hp loss compression
Loose rocker studs will cause it...not sure what else.


Thu Dec 26, 2013 3:31 pm
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