99 Yamaha 115 V4 Inshore - seems low hp

bbazinet

Recruit
Joined
May 19, 2015
Messages
1
My engine does not seem to be getting the performance that I see others getting from the same set up and I am looking for reasons.

The engine was rebuilt last year, compression in all 4 cylinders is right at 120 after running on hose for 5 minutes. It starts every time, runs steadily.

A couple weird issues going on:

Doesn't seem throttle is opening all the way up.

2 spark plugs on starboard side are very corroded, 2 on port look brand new - put in at same time.

Could the lack of power be a coil issue? CDI?

Any help is appreciated.
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
8,851
you need to explain what you mean by plugs being very corroded

Pic would help too
 
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