myzeneye Posted April 10, 2011 Report Share Posted April 10, 2011 (edited) i think the main crankshaft bearing on my 2003 sherco 250 is on its way out..... its making a horrible noise.... can anyone helps with advice on doing the job myself... as cash is rather tight at the mo' my brothers a mechanic, but to be fair, he fix's bus's...! he's pretty good tho...hahahah will i need any specialist tools/pullers /presses etc.... does any one know where to buy the best replacment bearings.... i really need help on this one.... i can removed the engine for him and take it to his work shop, but ill need a few clues on telling him what to open up,spilt etc etc... me, i havent a clue..! hahah just a basic run down on what to remove, etc would be a great help, im not asking for an in depth how to, just a basic step to step account of what to do.... is there such things as manuals for these bikes ? only ridden the bike 3 times, my first trial it throws its bloody hand in...... got to get it sorted before toatl despair sets in !!! any help is appreciated.. Edited April 10, 2011 by myzeneye Quote Link to comment Share on other sites More sharing options...
shercojay Posted April 10, 2011 Report Share Posted April 10, 2011 Here's a start for you http://www.sherco.com/wayne/Sherco_Engine_Teardown_and_Assembly_Manual.pdf Quote Link to comment Share on other sites More sharing options...
myzeneye Posted April 10, 2011 Author Report Share Posted April 10, 2011 Here's a start for you http://www.sherco.com/wayne/Sherco_Engine_Teardown_and_Assembly_Manual.pdf brilliant jay ! thanks alot for that mate .........that should get us on the right track..... if any one has any advice, pointers etc...please, nows the time to speak up ! hahaha such as, should i use any bearing in particular ? what parts will i need to order in advance, such as , crank case gaskets, any other bits and bobs im gonna need to hand... any particular gasket sealant to use etc etc.... Quote Link to comment Share on other sites More sharing options...
chewy Posted April 10, 2011 Report Share Posted April 10, 2011 I reckon Chris at Splatshop advert /link on this site will put you right for parts. Quote Link to comment Share on other sites More sharing options...
scraggydog64 Posted April 10, 2011 Report Share Posted April 10, 2011 I did mine and it was no problem with the manuals down loaded from the Ryan Young website. What I did do wrong was not undo the both crankshaft end bolts with the engine in the frame. However if you have an impact wrench it won't be a problem. Quote Link to comment Share on other sites More sharing options...
myzeneye Posted April 10, 2011 Author Report Share Posted April 10, 2011 I reckon Chris at Splatshop advert /link on this site will put you right for parts. yeah cheers, splat shop was gonna be my first port of call, its a crackin site, ive had a look and i think they should have everything i need, no problemo Quote Link to comment Share on other sites More sharing options...
myzeneye Posted April 10, 2011 Author Report Share Posted April 10, 2011 I did mine and it was no problem with the manuals down loaded from the Ryan Young website. What I did do wrong was not undo the both crankshaft end bolts with the engine in the frame. However if you have an impact wrench it won't be a problem. thanks , that is exactly the kind of help/info im looking for....any other pointers you may have are welcome, no matter how obvisous you may think them, all information is gold to me mate... Quote Link to comment Share on other sites More sharing options...
copemech Posted April 11, 2011 Report Share Posted April 11, 2011 Uh, well lets see, hopefully tour lad is worth his salt, so with the guide things are fairly self explanitory. Parts list from Splatshop: Flywheel puller Cyl base gasket(pull cyl with head attached) Clutch side cover gasket(don't bother with the small round cover) Center engine gasket Intake gasket 2 bearings(new style) 2 main seals(specify Viton if possible) Coolant Oil Hopefully I hav not forgot anything. Optional(depending upon budjet)for a really good freshen! New piston rings(and /or piston as well, depending upon condition) New water pump seals(and shaft if it is badly grooved) Pump cover seal(if removed with above) You can probably get all new engine screws and cyl base nuts for a tenner, this makes things look new throughout! If your lad has air tools, then be sure to properly scribe the three main engine nuts on either end of crank and clutch hub for bringing back to torque properly(or slightly beyond marks). Careful with the clutch hub nut. There is a separate guide on the pump seal replacement. Ck the pinned topic listed above the threads for a full list. Remember, if you do not read, and skip steps, you will pay double in the long run. Have fun, Quote Link to comment Share on other sites More sharing options...
myzeneye Posted April 11, 2011 Author Report Share Posted April 11, 2011 Uh, well lets see, hopefully tour lad is worth his salt, so with the guide things are fairly self explanitory. Parts list from Splatshop: Flywheel puller Cyl base gasket(pull cyl with head attached) Clutch side cover gasket(don't bother with the small round cover) Center engine gasket Intake gasket 2 bearings(new style) 2 main seals(specify Viton if possible) Coolant Oil Hopefully I hav not forgot anything. Optional(depending upon budjet)for a really good freshen! New piston rings(and /or piston as well, depending upon condition) New water pump seals(and shaft if it is badly grooved) Pump cover seal(if removed with above) You can probably get all new engine screws and cyl base nuts for a tenner, this makes things look new throughout! If your lad has air tools, then be sure to properly scribe the three main engine nuts on either end of crank and clutch hub for bringing back to torque properly(or slightly beyond marks). Careful with the clutch hub nut. There is a separate guide on the pump seal replacement. Ck the pinned topic listed above the threads for a full list. Remember, if you do not read, and skip steps, you will pay double in the long run. Have fun, thankyou copemech, im begining to feel alot less daunted by the hole thing, now with this kind of advice and the sherco rip down info etc.... our kid is pretty good to say the least and should cope fine if i give him the right info and any golden nuggets of advice you guys are coming up with..... we all know, sometimes manuals etc arn't so clear in places......and they certainly cant account for some elemenst of common sense..... thanks guys.... just wanna get started on it and get my bike back to perfect working order..... Quote Link to comment Share on other sites More sharing options...
myzeneye Posted April 11, 2011 Author Report Share Posted April 11, 2011 also, i can see ill need a fly wheel puller, but the "rip down" also says ill need a clutch tool ? is this right ? or is it not nessesary ? Quote Link to comment Share on other sites More sharing options...
scraggydog64 Posted April 11, 2011 Report Share Posted April 11, 2011 You will need a flywheel puller I got one from trials bits but I can't recall the size. You may not need a clutch tool if you have an impact wrench, can't recall. I seem to remember it was an absolute bugger getting the engine out of the the frame. With hind sight I would remove the top end with the engine in the frame. Quote Link to comment Share on other sites More sharing options...
myzeneye Posted April 11, 2011 Author Report Share Posted April 11, 2011 well guys, ive copped out im afraid.... i was recomended to use a bloke who's local and after speaking with him thought it easier to hand it over.... cop out i know, but i suppose in theory doing the job is one thing, but i could imagine a whole load of things that could go wrong and i just couldnt ber that sinking feeling of kicking it over to get nothing when ive rebuilt the bugger...hahhaha i took it over to him tonight and we run the bike..... it seemed alot quieter then it did before it threw its hand in....he said he'd heard plenty worse sherco's... he looked at the flywheel and everything seemed ok, he said the bearings just felt a bit notchy, probably due to the bike doing so little work and probably being stood still in the previous owners garage for some time..... but still, something wasnt quite right.... he stripped the clutch housing off and had a fiddle with the kick start mechanism... and allthough there were no teeth broken or any visable signs of damage, it didnt seem quite right either.... ive left the bike with him so he can whip out the clutch and have a look deeper into things... Quote Link to comment Share on other sites More sharing options...
ormplus Posted April 11, 2011 Report Share Posted April 11, 2011 exhaust front pipe packing ring. Quote Link to comment Share on other sites More sharing options...
myzeneye Posted April 24, 2011 Author Report Share Posted April 24, 2011 well, its all done..... what a differance, its like a different bike !! soooooooooo quiet and smooth...... the crankshaft bearings, one of them had melted !!! cost about Quote Link to comment Share on other sites More sharing options...
nelly1 Posted April 28, 2011 Report Share Posted April 28, 2011 hi mate its neil andys mate we met at llangollen when your bike threw the hand in i now have a montesa 315 which needs the mains doing can you recomend the guy you used to do mine ? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.