40hp 1981 merc thunderbolt

info404

Cadet
Joined
May 23, 2009
Messages
20
ok, gonna seek more help by makeing another post.
2 cycle 2 stroke ser#5992675. after every trip to the lake, i clean plugs and add fuel 50:1 this time i added some marine stabil for the first time after all the ethanol write ups. it started fine, and idled ok, then powered up and no speed. when i throttled all the way it seemed like the power was gone and like it was running on one piston. i changed the plugs on the lake and took it out again and still no hi end power. felt like it was lugging or flooding but it kept running. checked compression and its 120psi on both ports. spark is present although did not measure with gauge. any ideas? it says theres a duel speed circut which i wouldn't know how to check. but found nothing in trouble shooting as to it being a fuel problem or electrical. it seems to be getting enough fuel though. thx...04
 
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