Quote:
Originally Posted by frankiefrank
I have a 150cc roketa. I have replaced as followed
cdi, coil, carb, cylinder, cylinder head, cam,air filter,jets etc.....
will not rev up and pipe gets glowing hot.
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Ok..so you replaced all those items because it was getting glowing hot? Was it running the same before you did all that? First thing to remember when 'upgrading' anything.. ONE PIECE at a time..that way when you have problems..guess what it is? Exactly..it is the last part you put on..
Otherwise who know what part it is and could be a combo the many parts you put on.
Anyway..running hot..not revving ..and glowing pipe is the #1 sign of an obstructed exhaust. If it sat that long the muffler may have a Bees nest..Mud Dauber nest..mouse house or other critters in it. Regardless it must be plugged. Now for the bad part. If the engine got so hot the muffler glowed or was even extremely hot so you could see it or smell it. The engine is most likely burned up by now..
Sad but true. If it was the CDI..it would not even start..if it was a too lean jet..it would still rev higher but get hot. If it were any of the other parts you replaced..it would either run..or not run at all...as they would not cause it to run hot. back in my day..the 70's and 80's..it was a common joke to shove a Potato in a person Car exhaust pipe. The car would run a few seconds..bog then shut down..or it would run super hot. What you describe is a picture perfect example of a plugged exhaust system. If the valves..intake or exhaust were set to tightly the engine would not even start..cause when too tight..they are partly open so no fuel gets in because there is no vacuum and there is also no compression stroke because with both or even one valve to tight..well ya get no compression. What does this all mean? Simple..an obstruction..
