force crankcase pressure

[ggermain]

I have a force 89 - 85 HP. It's a 3 cylinder. The upper 2 carbs don't have nearly the suction as the lowest one ; good spark ,compression etc. <br />fuel supply OK. My mechanic thinks air is exchanging between upper two cylinders and recommends taking block apart and rebuild. Does this make any sense?

 

[DJ]

Re: force crankcase pressure

Yes, it does make sense. There are seals on the crankshaft to stop that from happening. Force is not unique in that aspect.<br /><br />It has to come apart to have those seals replaced.