wombat

ill try the plug first and see how it goes..thanks all.

my 2003 Sherco 250 is hard to start after about an hour of riding, stop starting at a trial. Its been happening alot more over the past 2 or 3 months. I was told when I bought the bike(but no receipts) it had a top end done before i bought it about 4 years ago. Im thinking Crank seals maybe on the way out. Are they an easy engine to rebuild? Ive rebuilt my Ty250a a couple of times, so its about on par with that? Cheers. as an add on: I have cleaned out the carby time and time again, new airfilter, checked the float height as well.

I still have the TK on mine and is running nice after 30 years of competition. I have looked a mikuni replacement later

used ATF Dexron III for years without any trouble..

A good mate has cracked the main case behind the kickstart. At a local trial, he went to kick it to life and all he hears was a big BANG, as if someone hit the bike with a hammer. On 1st inspection he found the kickstart was not working, just loose when using his hand and a piece of alloy under the carby. GAME OVER! At home he took off the carby and found the crack had extended to under the carby position. He checked the oil carefully and there was no evidence of alloy or gear pieces in the drained oil. We are both at a loss as to how this happened. How easy is this to repair? Or are parts available?

I finally found a Woossner piston, a full kit was A$160 I think, then had the bore honed to suit.

Im thinking it maybe fuel issues here...as I dont have anyone close by who would let me strip their stator out of the bike (Closest 1 would be 200kms away...) Ill look at the carby again. Thanks for your input.

Ive had teh stator checked out and its ok. Almost imediately it stalls i can re-start it 1st or 2nd kick.

checked tank vent, all clear, I thought of that as well..no fuel filter as I cant find one small enough!! Its pretty tight under there..

ok finally got the bike to run, and run it did!!! did some practice work, then it just stopped..1 kick and it fires back up and off I go again for another 1 minute, then stop. I cleaned out the carby, the gauze behind the inlet too, blew it all out with the compressor, checked the floats not sticking etc. there is no kinks in the fuel hose and its stock tuning. Can anyone help with this one?

he showed me a pic of the oil, and it would have done the ice coffee manufactures proud! He's taking the bike back to the workshop where he bought it a few months ago for a full check over( waterpump reco, fork seals and tune up) this week. It could be just condensation as you have pointed out, but he would like it sorted before he rides it again. Ive had milky oil in my TY250a ages ago and once the engine warmed up it wasnt too bad after. I changed the oil completely the next week.

thanks for the info, he does have a Yamaha WR400, so he is familiar with watercooled bikes, but this one had him stuffed. When my '03 Sherco's waterpump was failing, it dribbled coolant thru the small hole to let me know something was amiss there. The Beta has done none of this.

A friend has a '94 Beta and drained his gearbox oil and found it a coffee colour mess. There is no obvious sign of missing oil or water coming from the engine. How can we determine where the water is getting into the oil? I thought it maybe a water pump issue. Thanks.

I cant contact him via phone from OZ, would you be able to ask him if he has TY250a .75 piston and ring kits, please?

after a couple of days away from the bike I checked the wiring and it was still no go til I went to put the tank back on, I moved a wire and a black wire pulled out of the connector. I found a new connector, put the tank on and it fired up almost straight away! Now to test it properly, going for a ride! thanks for your help.

just cleaned the earth points with a wire brush and fine grit paper, replaced all and sundry, and still no spark. I found the CDI values online and I'll be sending the bike to the workshop next week......

oh hell now I read this, there was some corrosion on the mounting...mmm it could be it! I'll clean it up and the other earth point tomorrow Thanks for the help!

taper is good, no loose wiring inside, all clean. Key is in good condition also. retorqued nut on re-assembly. Still no spark. Sprayed electrical cleaner into kill switch, still nothing.

A couple of days ago I had the Sherco running just fine and now when I need to wash and check it over it has no spark! I'll be getting a new plug tomorrow and try that. I disconnected the kill swith from the handlebar as well when testing for spark. I hope it hasnt spat yet another crank key.. Any ideas?

If you try that sort of riding on the streets in OZ you'll be locked up real quick!

tuck it all up on the left side, refit the cdi/coil unit as required. It does fit, just a bit of patience...Ive done it a couple of times, make sure the thermostat isnt making contact with the tank, if it does, just loosen the jubilee clips and move it round a bit.

My Sherco spat the stator early this year. Thanks to Chris at the Splatshop, Don at motocentral(ACT, Australia) and all on here. My '03 is now running just perfect! All the bits went in ok, but no go...mmmmmmmm. OK over to Don's to get it checked out properly. Liam, the mechanic had it running spot on within about 10 minutes! LEGEND! The stator from Chris combined with the parts from Don,Liam had snipped the wiring loom and saved me about 30gms in weight! Liam had retarded the timing just a tad and its just how I need it. I'm waiting now on a rear brake caliper kit to arrive, i'll have that fitted then its summer training!

DONE!

Help! I've trawled thru the net over the past few weeks for a set of 3rd oversize rings for my TY. I cant find any...do I need to go to the 4th oversize? The bore is within spec for the 3rd oversize.

thanks to you all, the Sherco is back in 1 piece and going strong! Now to get the brakes working as they should!!!