Posted 22 January 2012 - 05:14 PM
Does anyone have any ideas what maybe up with it? I'm hoping it's not the crank as iv looked on splat shop and they are like £450 :-(.
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Posted 22 January 2012 - 07:00 PM
Posted 22 January 2012 - 07:26 PM
Posted 22 January 2012 - 07:32 PM
Any play there would indicate a blown crank (if it is the bigend you can have the crank rebuilt with a new con-rod kit)
But two strokes will tend to run even with a knackered big-end (very noisily until something gives!)
how old is the bike?
Edited by Monty_Jon, 22 January 2012 - 09:23 PM.
Posted 22 January 2012 - 07:33 PM
Posted 23 January 2012 - 03:36 AM
With piston halfway down, rotate flywheel to ck for lost motion in the conrod.
Posted 23 January 2012 - 05:24 PM
Posted 23 January 2012 - 07:42 PM
It shouldnt cost a fortune to rebuild, new rod kit, main bearing +seals, gaskets and a new set of rings
It would be better than buying a second hand motor as you may buy another rough one!
(Also check the barrel, any flaking or score marks then you can add £££'s)
Edited by Monty_Jon, 23 January 2012 - 07:43 PM.
Posted 09 April 2012 - 06:23 PM
The engine tone changed, then the bike felt sluggish, when you closed the throttle rather than just coasting like its always done it was like I was applying the brakes. Then the engine stopped. Tried kick starting it but the kick just felt totally lifeless when being kicked if that makes sense?
Anyway, got home removed the head, carb and fly wheel cover and when I tried to rotate the flywheel it would at certain positions be almost impossible to rotate then it would free up. Couldn't even get it past these sticky points using the kick start by hand.
Then after sometime rotating the flywheel backwards and forwards it started to free up and seem fine but then suddenly the stickyness appeared again.
On inspection the barrel looks quite good and there's no obvious signs that the piston is worn. Does this point to main bearings?
The bike is a 2004 Sherco 250, if it's main bearings is it a crankcase split job, never done that before and at the moment it all seems a little daunting.
Any help much appreciated.
Posted 09 April 2012 - 07:13 PM
Edited by ZIPPY, 09 April 2012 - 07:14 PM.
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Posted 10 April 2012 - 08:28 AM
If it is the crank big end whats the most ecnomical route to repair, is it £400+ from Splat / Rathmells or can it be reconditioned?
Whats the best was to determine if its the big end bearing or the main crank case bearings as from the following copied and pasted thread it seems fairly economical if its main crank bearings.
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...
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 £90 for all the bits/ bearings ,gaskets, oil n coolants etc, oh an a new spring in me kickstart mech.... but worth every penny.....
Posted 10 April 2012 - 07:10 PM
Posted 10 April 2012 - 08:59 PM
Many thanks for your help and advice.
Posted 15 April 2012 - 11:25 AM
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