December 19, 201015 yr Hi there,was wondering if anyone could help with my sherco 290 2001 model. The bike starts no problem and runs well but once you get into higher rev range its like its starving itself of fuel and loses power but runs great until higher revs are needed,I done piston rings and top end bearing and put new top end gaskets on as well as there was a top end rattle when i bought the bike so i stripped it straight away and as i never took bike out after i bought it,im unsure if it was like this before i done the work,I have had the carb off and cleaned everything twice with carb cleaner etc but still the same although it feels like its a carb problem to me,its like when the chokes left on on your bike and it wont rev properly until you put it off,,,Any ideas anyone???? thanks
December 19, 201015 yr I believe some of these models had a problem with the fuel tap. Have you tried running it on reserve. The Sherco site covers a modification.
December 19, 201015 yr Author Hi, have you put a new plug in it and checked air filter is clean ? cheers
December 19, 201015 yr Author Hi, have you put a new plug in it and checked air filter is clean ? cheers Hi, i put a new plug in when i put it back together and cleaned,oiled the air filter,thanks for reply!!
December 19, 201015 yr ok, it might be worth trying a different plug just in case that ones faulty ? unlikely but you never know cheers
December 19, 201015 yr Author I believe some of these models had a problem with the fuel tap. Have you tried running it on reserve. The Sherco site covers a modification. Hi there,I havent tried that but i will try it asap to check that,do you know what the problem was with the fuel tap,thanks a lot for reply!
December 19, 201015 yr Author ok, it might be worth trying a different plug just in case that ones faulty ? unlikely but you never know cheers That was what i thought too originally but i bought a set of 6 new plugs and so far i`ve tried 3!!!!! its a strange one why it wont rev because at lower revs it runs great,thanks!
December 19, 201015 yr it is yes, try the fuel tap, as was sugested, but it could also be electrical, poss cdi ? fuel and electrical problems have pretty much the same symptoms. good luck
December 19, 201015 yr Author My gas gas 250 has the same carb as my sherco 290 but i take it the jetting would be different with it being the 250?? would it be worth while trying that carb on the sherco to see if it ran ok with that one??? thanks..
December 19, 201015 yr That was what i thought too originally but i bought a set of 6 new plugs and so far i`ve tried 3!!!!! its a strange one why it wont rev because at lower revs it runs great,thanks! Blockage in the exhaust ???
December 19, 201015 yr Author Hi,i dont think its the exhaust as i cleaned all the front pipe and shook all the crap out of it before i put it back on,thank you
December 19, 201015 yr Author Thunk i`ll try the fuel tap,run on reserve and at least that will eliminate that anyway if its still the same!
December 19, 201015 yr i'm no expert on this at all, but i had a problem with mine which was traced to a perished "o" ring on the idle screw which was letting air in. maybe shove a bit of grease on it, see if that helps.(if it does, then you can replace it) what size jets are you running? maybe a kink in the fuel breather pipe too? good luck !! Caddabs
December 19, 201015 yr Author Hi,im not sure what size the jets are,im going out to the garage just now,will try the things that people have said and see if i have any joy,,wish me luck!!!!!!
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