No power after 2nd gear go's a little faster in 3rd but not much

S

Slowgo

Member
Clutch pack was replaced yes it does not rev out. cylinder and piston and rings were from tb parts piston at top dead center
 
JHminitrails

JHminitrails

Well-Known Member
I'm just getting caught up on this thread. From what I gather, you say you ONLY have 90psi compression AFTER the new top end was installed?? If that is correct, that IS your issue, not something else mechanical. @OLD CT had mentioned this earlier and it seems you've glazed over that reply. All of the CT engines I've built will make 150 to 180psi right after assembly....before I even fire them! Like others said, a picture says 1000 words. There are alot of JUNK incorrect cheap top end kits advertised and sold, and if you have the wrong parts installed, you have the wrong parts, period. Until you confirm you have the right head and piston configuration you're chasing a ghost looking for a problem that doesn't exist, or looking in the wrong areas for another problem. When really the issue has been staring you in the face the whole time, one that may have been created unknowingly by yourself because your bought something that was falsely advertised by a vender strickly concerned about money. Honest mistakes happen, you trusted what you read, doesn't mean it's true though. Everyone here WILL help you, we just NEED more info as we are not there and did not build your motor. You're in the right place for help, don't give up!
 
kirrbby

kirrbby

Well-Known Member
You mentioned tbparts top end...but if you got the wrong piston...one made for a newer engine...the piston would be too short to reach the top of the cylinder at TDC. In the hole...too low deck height...low compression and power.
If it's not winding out on the top end...it could be caused by a lot of different things...gearing, restricted air flow, carburetion...I need to read thru the thread again to see what you've covered already.
 
B

Blaine

New Member
My 90 had little power when i got it. Previous owner assembled the chain incorrectly. I can’t remember if it was off by 1 tooth or 2 teeth, but either way, it didn’t have any power.
 
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