Blow Engine?

[jakey]

Hey
Riding my pit pro 125cc rr
it started with having jerkyness in 3rd gear. I thought it was because the sparkplug lead was burnt put new lead on still did it. This afternoon the bike stalled and has no compression like you can move the kick starter up and down?

blown engine?

 

[unitrider08]

doesnt sound good maybe u blew ur rings or sumthing happened to ur piston i duno aye lol ive never blown an engine yet myn just seized or had too many problems to fix it

 

[jakey]

yeah sucks anyone??

 

[no_crf50_here]

check your valves

 

[jakey]

im thinking gear box how do i "check valves"

cheers

 

[no_crf50_here]

i could search how to check valves but i'm very busy

 

[Dabomb]

likely suspects:

oil level - is it too low or too high?
fuel cock - is it on reserve or empty or off?
Spark Plug - is it covered in fuel or oil?
CDI - may be on its way out, try another one to verify.
Carby & Air Filter - may have dirt in it may need a clean out.

Valve Clearance
(remove valve inspection cover(s) and while at TDC check the gap between the rocker arm and valve with a feeler gauge.
nominal sizes, .003" inlet and .005" exhaust)

 

[mattbombers]

thats the same as my bike it even stalled in 3 rd but i have a fair bit of compression and only replaced the rings a few weeks befor the bike conked it but im might be buyin bigM's engine if i get the cash and he still wants to sell