Was looking at buying a 2007 290 Sherco, Its going cheap but he says it was ran for about 5 mins without coolant. It is starting first kick now. Whats the chances on it having seized after that long running without coolant? if I went to look at it and left it to heat up real well would it be safe to assume it not heat seized?

Worst case scenario . . .piston and rings, head gasket and maybe a rebore. Anyone idea on approx proce on that parts wise?labour I can do myself.

Cheers, appreciate any input

Was looking at buying a 2007 290 Sherco, Its going cheap but he says it was ran for about 5 mins without coolant. It is starting first kick now. Whats the chances on it having seized after that long running without coolant? if I went to look at it and left it to heat up real well would it be safe to assume it not heat seized?

Worst case scenario . . .piston and rings, head gasket and maybe a rebore. Anyone idea on approx proce on that parts wise?labour I can do myself.

Cheers, appreciate any input

difficult to be sure as he could be telling you anything. I think its possibly more than 5 mins and hes just covering his back but you need to judge that. Its a nikasil liner so you cant rebore it you would need to re coat the liner and I think thats over

my 290 has great compression and takes a good boot to start it, if it has nipped up it often traps the rings and compression goes so a quick compression test would reveal if compression has been affected

if you can get the exhaust off at the barrel have a look up the exhaust port and you'll see any scoring on the piston as it's more likely to nip on the exhaust port side

i think the bore is nicosil plated so it wouldn't be a rebore it would be a costly re-plating

difficult to be sure as he could be telling you anything. I think its possibly more than 5 mins and hes just covering his back but you need to judge that. Its a nikasil liner so you cant rebore it you would need to re coat the liner and I think thats over £100, check with Langcourt they should be on the web. Pistons are quite pricey for a sherco but you can get all the prices off Chris at Splatshop, they have an easy to use website.

Normally when one of these overheats it damages the head rubber o rings and when you put coolant in it leaks out of the cylinder head / cylinder joint.

I had a 2007 290 a while back, great bike by the way.

yeah had a look at a piston set, £150. . . fook that!!! Its a tough one to call its either go look at that or there is a 06 250 pretty close, just rebuilt, has black frame so thats the later model yes?

would prob be the better option I think

What ye think?

Edited November 30, 201015 yr by tayto94

yeah had a look at a piston set,

Did the piston sieze? Does it rattle too much? That would be the question?

no says it didnt seize, its still running like.

Walk away, plenty of others to choose from.