RM125A jetting specs

[suzuki27]

Have you checked the output of the coil/plug lead; stator high/low speed coils etc with a multimeter.It still  might be worth doing a "leak down "test, if you still can't get it right.Also,check that your choke is sealing properly-that had me stuffed for ages on an old RM-someone had changed the choke and it wasn't sitting /sealing off completely when it was turned off-when that was fixed,a very rough running bike ran like a train.

[pmc57]

RM1976,
Your're still way to lean on the main for a RM125S. If you're running out of legs at the top, the bigger main should help, or like said earlier, you may end up witha hole in the top of the piston. Are you sure you have an S, they have a 34mm carby.

Standard carby spec's for a S is:
Main #280
Pilot #35
Needle #6DH3 (third clip from top)
Needle jet P-3
Air screw: 1 turn out

[rm1976]

Thanks for your tip about the choke on the carby but it all seems fine
Jetting is now 270 main 27.5 pilot 3rd clip 11/4turns out
I will check the resistance on the hi & lo speed coils
Racing at Tamborine this weekend lets see how she goes

[rm1976]

all jetting questions have been answered little rm is flying
holeshot buddy rode the last race at tamboreen and won by a mile
think i might retire and just build bikes for russ buddy