Posts: 1
Joined: 4/1/2018
Location: CAN
I helped a friend rebuild his 1997 rm125 it took like 10 kicks to start up the first time. He took it out for a ride today and ran fine for 2minutes then started sputtering. Now the bike wont start and ge said it has low compression. Any causes and how do I fix this? Thank you!
Posts: 5799
Joined: 1/31/2018
Location: Mansfield, OH USA
Posts: 741
Joined: 7/30/2013
Location: Louisburg, KS USA
Posts: 3593
Joined: 4/3/2013
Location: Benton, LA USA
Also if the ring end gap was to tight will cause the ring to stick.
An air leak will cause a lean condition that will cause it to over heat and stick the ring. A bad crank seal caused by a bad crank main bearing will do the same.
A rod bearing can cause the same thing as the excess heat will travel to the piston.
Paw Paw
