Compression Question

[micah1234]

My rm125 motor took a shit so i got a new one, however the new one i got has very low compression, would low compression not make it start? It kicks over and has spark and every fourth kick it back fires. Should i get new rings and a piston and would this make it start right up?

[ttbanshee_rida]

Compression test!!!!!!!!

then tell me how low it is

[climb any hill]

Yes, low comp will make it hard to start. It has nothing to do with the backfire.
check your air filter, intake, seals, jetting for the backfire problem..

[ltfirebreather]

back fire plug going bad