dcole5

I agree, easiest thing to try is a 120 main and see what happens. It runs perfect right now and big revs for a splatter are ok, it is only after a bit on a big hill or road and yes, it seems like it just is running flat and starved for gas. Plug reading is a light brown. I will clean tank and carb and fuel pump also.. Thanks !!

It is a short distance before starving for fule. It does seem to be a fuel pump related issue. Not worried about going hard on a road, but what happens when I have a hill climb section at a trials ? I will check all the fuel inlets on the carb. In the mean time, perhaps a 120 main will help a bit, but if there is no fuel in the float this will not make a difference. Thanks for the insight

I will check out the fuel inlet float jet. This sure seems like the symtom. Thanks for the tip

I live at 6000ft elevation and trying to jet the 2012 290 Sherco. I have everything stock and put in a 118 main jet. (125 is stock) Seems to be pretty good, the plug is a light brown and all is good except it really seems to be starving for gas at really high RPM's going down the road. I might try a 120 main, but just wondering what everyone else is running at this altitude range. Overall the bike is truly amazing ! Thanks