Several months ago I purchased a 95 YZ 125 that needed a top end rebuild, or so I was told by the previous owner. As such the motor was disassembled and in a box. After sorting through all the nuts, bolts and various top end components, I purchased and installed a new piston, rings and gaskets as needed. I also drained the gas and radiator. After getting everything back together it started on the first or second kick. I then rode it for a minute or two then shut it off and let it cool down. Since that first start it continually got harder and harder to start until it finally just would not. ( The new piston did not even get an hour of ride time).
Frustrated I let the bike sit for several months- today I dissassemble the top end to find the piston pretty chewed up (right and the ring gap), thus the low compression. I happened to have a new ring in my shop so I cleaned up the old piston and installed it with the new ring. The bike now seems to have decent compression but will still not start. It seems to be getting gas (I tried starter fluid). It is getting spark (altough it looks weak).
My two stroke skills are limited- Is there anything I can do to pin point the problem? How do I know if the spark it too weak. The compression will blow your finger off the plug hole. I am sure some of you two stroke gurus will have some insight and it will be much appreciated.
Also carb has been cleaned and reeds are new.
Frustrated I let the bike sit for several months- today I dissassemble the top end to find the piston pretty chewed up (right and the ring gap), thus the low compression. I happened to have a new ring in my shop so I cleaned up the old piston and installed it with the new ring. The bike now seems to have decent compression but will still not start. It seems to be getting gas (I tried starter fluid). It is getting spark (altough it looks weak).
My two stroke skills are limited- Is there anything I can do to pin point the problem? How do I know if the spark it too weak. The compression will blow your finger off the plug hole. I am sure some of you two stroke gurus will have some insight and it will be much appreciated.
Also carb has been cleaned and reeds are new.