1989 Mariner 150 2 stroke RPM issues

usflyboy64d

Recruit
Joined
May 12, 2014
Messages
1
Ok I am having an issue getting my boat up over 2000 rpm's. Its a oil injected mariner 150. I have already rebuilt the fuel pump, replaced the plugs and verified gaps, replaced impeller, and checked compression. The compression is at 115-125. It is vibrating really bad at around 1500 rpms. The last time on the lake after about 30-45 mins of running and a half a tank of fuel it starting running perfect. I was trying to see if maybe I had bad gas. but the next time I took it out it was the same thing all over again. it had this problem at the end of the last season. but it was only this way if I had a full tank of gas.... any ideas?
 
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