May 13, 201016 yr Hi Guys, I have an 08 250 sherco which I love. It starts easily, idles great, it pulls smoothly from low revs through into a nice usable mid range and then it all goes wrong!. The bike absolutely refuses to rev out, its as though it hits a rev limiter!. I have made sure jetting and fuel/oil ratios are correct, fitted a new plug and ensured all electrical connections are clean and tight. Has anyone got any ideas as to what I can try next?, I feel its going to be an electrical issue but was hoping it isn't the stator! Thanks in advance for any advice/ideas
May 13, 201016 yr Author It sounds like the revs are bouncing, a bit like when someone is revving a cold bike that hasn't warmed up properly and I guess it feels a little like that too. It stops pulling and as a result I need to carefully evaluate any climbs and pick taller gears that I wouldn't normally
May 13, 201016 yr Author Sounds like a carburation issue. Thats what I thought but I've stripped and cleaned the carb and used the jetting recommended by Rathmells with little/no improvement. I have also tried larger main jets as I thought it could have been fuel starvation but had no change in the characteristic of the bike
May 13, 201016 yr Gday - is the air inlet restricted in some way? - over oiled filter for example? Your exhaust should be reasonable at this age but it might pay to have a look in there as well. Maybe repack the muffler at least. Cheers, Stork
May 13, 201016 yr Author Gday - is the air inlet restricted in some way? - over oiled filter for example? Your exhaust should be reasonable at this age but it might pay to have a look in there as well. Maybe repack the muffler at least. Cheers, Stork Cheers Stork, I'll check these out
May 13, 201016 yr when does it do it, from cold or when hot???? have you checked fuel breather on tank. I had similar problem but it only happened when fan came on, it was the little black fan voltage reg, only a couple of quid.
May 13, 201016 yr What size main jet is in it? Does it have stock reeds? Do you cary a spare coil in your backpack? Edited May 14, 201016 yr by copemech
May 14, 201016 yr Do you cary a spare coil in your backpack? Never leave home without one, I carry a spare coil for everything I own. Coil of electrical wire. coil of tape coil of rubber bands coil of film (old school not that fancy digital HD stuff) coil of mechanics wire Just gotta be prepared
May 16, 201016 yr Author Hey guys, I'VE FIXED IT!!!!!, thanks for the advice, Just thought you'd like to know what was causing this mysterious issue. As I said before the bike started and ran fine except at high rpm, where it wouldn't rev out. Well after going through the jetting, checking timing, rebuilding the engine and checking ALMOST every terminal for cleanliness and corrosion, I thought I
May 18, 201016 yr Hey guys, I'VE FIXED IT!!!!!, thanks for the advice,Just thought you'd like to know what was causing this mysterious issue. As I said before the bike started and ran fine except at high rpm, where it wouldn't rev out. Well after going through the jetting, checking timing, rebuilding the engine and checking ALMOST every terminal for cleanliness and corrosion, I thought I
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