thanks for reply billy you seem to know what you are talking about i have previously tuned a race winning proddy bike ( 250 lc yam ), so i was also aware of the folly in removing reed stops for power on trials bike as for the boyesens the last ones i bought were two stage affairs with a small reed covering a window in larger reed and these did in fact help the low rpm power and torque, i was hoping that would be the type of reed boyesen would sell for 125 pro. i like the idea of sleeving carb as 26 mm seems too big for bottom end power on 125 trials bike but how would you go about sleeving carb, the other things you mention seem a possible source i assume you suggest taking 0.5 mm off cylinder to increase compression and bring power a little further down rev range by lowering height of ports i could then lift exhaust port 0.5 mm to give it back its top end, last point re ignition do you mean get it reprogrammed for more advance as timing is fixed, thanks jeff

Wow!!!

Just reporting back.

My bike has had the throttle cable the same since i bought it, but just today i tightened the throttle cable right up, i didnt think it would make a difference, but it is a completly differnt bike!!!

Thanks for the suggestion whoever it was

Thanks.

Richard

Gearing should be 9-46.