Originally Posted by Lecheroandpuertorro
i dont understand one point i measure the compression of two 66cc engines and the measure is same 150 psi and i measure the 68.5cc engine and have a compression of 250 psi my friend is a maniac with your engine and dont head off only for a suspect i need a biker with this two engines and with the experience of disassembly this engines and compare both s
..i believe this person exist in this forum...thanks my friends
No matter where you look you will never find any parts listings for a "68.5cc" engine.
49cc 66cc are the most common and 66cc is the biggest of the China Girl 2 smokers.....
Myself and many others have rebuilt these engines from the ground up and there is only a 66cc engine that gets called 68.5cc, 70cc or 80cc
As to the 250lbs compression I have no answer for that.
Go to this link and scroll down, read and you will see this engine is called a 66cc, it's called a 80cc and in the final description it is refered to as a 68.5cc engine, the truth of the matter is that this is a 66cc engine and this is the biggest displacement of this type engine that is made
80cc Motor Bike Motorized GAS ENGINE KIT black X-80BK | eBay
I dont see one of these engines being capable of being roll started if the compression was actually that high, that is about like diesel compression ratios and not typical for one of these loosely built chinese engines, that kind of compression would require a much better built engines than these are to have any durability in my opinion.