6 replies to this topic

[gasgas249uk]

Ive a friend who runs a 2009 Scorpa 250 fitted with the Yamaha engine.Its a clean bike that doesnt look like its had much use.
The problem is that It smokes a lot all of the time , low revs , high revs you name it. Im suspecting the crankcase oil seal on the right had deteriated.It does rev cleanly and is mixed on 80/1 silk sythetic.

Is this a common problem on this engine?
***Can the seals be changed without an engine split ?***
Anything else peculiar to this engine look out for ?

Ta in advance

[airwave]

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[airwave]

Mine (a 2002 model) does the same.

Have researched and the plan seems to be;
drop oil / water
remove RH engine cover
Remove Clutch Basket
(possibly bits of water pump too?)
two self tappers into the old oil seal
pull the old seal
push in the new one
rebuild

If you say it really quickly, it sounds simple.
the only real issue is going to be getting the clutch basket off.

as you can tell, this is theory.
I have the bits gasket / seal, just not got round to doing it yet . .

someone must have done it tho, is it really that easy?
are there dodges to getting the clutch basket off?

[gasgas249uk]

airwave, on 02 April 2012 - 11:24 AM, said:

Mine (a 2002 model) does the same.

Have researched and the plan seems to be;
drop oil / water
remove RH engine cover
Remove Clutch Basket
(possibly bits of water pump too?)
two self tappers into the old oil seal
pull the old seal
push in the new one
rebuild

If you say it really quickly, it sounds simple.
the only real issue is going to be getting the clutch basket off.

as you can tell, this is theory.
I have the bits gasket / seal, just not got round to doing it yet . .

someone must have done it tho, is it really that easy?
are there dodges to getting the clutch basket off?

Well at least its not an engine split. Thats not to bad then . My typo above should have read that is does NOT rev cleanly- dooh

[zzr14]

Yep dead easy job to do, If you don't have a impact gun 1st gear and hold the rear wheel to get the centre nut off!

[gasgas249uk]

Heres one of those rare "im updating you after the repair posts"
I complete the seal replacement yesterday and it transformed the bike letting it rev properly. The old seal had flattened off completely. Im quite surprised . Id have thought it would have been better being Yamaha. Spanish engine seals last 20 years. So its official the Spaniards make more reliable engines than the Japanese . Also... the metal bush that slips over the crank shaft and into the new crankshaft oil seal has no internal oil ring, meaning oil can slip between the crankshaft and the bush from the clutch area into the bottom end.Hmmmmmm. I suppose the tight is fairly tight and they dont smoke normally.
My poor mate paid £38 for both seals. They were better quality than the usual cheap rubbish you get off tinternet. 2 hours to complete including using old gaskets again with sealer, which takes time but saves another £30. Pretty straight forward.Whizzy gun got clutch nut off. The nut holding the crankshaft gear on was 14mm and much harder to undo. Lots of Rag between the cogs did it.

[scorpa01]

i've done this job on my 2001 as smokes heavy but is still the same as before so not gauranteed fix

[copemech]

Others could come accross this issue as I figure none the standard black seals were designed for the alcohol induced fuels.