Marhsall
New Member
- Local time
- 7:54 AM
- Joined
- Jul 12, 2016
- Messages
- 15
Ok so was experience what I interpreted as a lot of compression loss at valve cover. Bike ran like s**t. couldn't climb small hill, no power, and seemed to get hot fast. Can't even ride a block on it. Tore engine all the way down. 49cc 4 stroke. Now the small hole That all that pressure that kept beat with engine rev, Is actually a tubed chamber that goes down to the crank case. Now in my mind as the piston goes up and down that is going to create a suction as the piston goes up and a outward pressure as the piston goes down. Same as it would on the top of the piston. Wouldn't that positive-negetive pressure need somewhere to vent? Wouldn't this be then be normal? Valves look good, very, very slightest wiggle on exhaust valve. piston looked good. Broke rings as I took them off as mine as well replace them while engine is apart. The only thing that was at all noticeable other then a little carbon build up on piston and exhaust valve. Was the exhaust valve more lubricated then the intake valve. I am also assuming the valve guides on these can't be replaced, but it is extremely slight wiggle. So that's my Mr. Wizard question. Wouldn't crank case need to vent through that chamber?