engine fu*k up

[hopoffbaby]

engine fucked up yesterday!
i was riding down the a610 at full throttle for about 30mins. was running fine until "pop" stops dead. it now wont start or even try to start!
what colud be wrong?
the bike cost £725, ive already spent £300 for repairs on crash damage(although my mate is paying me this back in installments cuz he crashed it) and now i may face another big bill. what shall i do

[Demonic69]

Petrol...Ditch...ahem.
Any NCB??
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Back on a Blade. Just feels so right.

[G]

/me goes to look for rubber band


err... sorry, my very limited knowledge of engines doesn't extend anywhere near scooters

[Demonic69]

[Scotty]

Is the piston still going up and down in the barrel??
Ie you can kick it over?? although it wont start?

Could be that the piston rings have seized and closed on the piston.
Therefore losing compression.
This could have happened because a loss of oil into the barrel, and the
fact you was on full throttle for 30mins......maybe...

Think keith would have a better explanation than me.

I supose if the engine wont spin round then you have seized the top end...


hope this helps a little.
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Regards
Scott

[TiN]

I assume that you are referring to your scoot?...unless you've got yourself a proper bike recently
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TiN
dotgems.net

[JimboJ]

push it do dover, and then over the edge, claim it was robbed
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[hopoffbaby]

[Scotty]

yes this probably means the engine has not seized.
But if i am correct about the problem it might cost you a

new piston
Barrel
Rings
and gaskets

But i'm not too sure on this.
I think what happens is that becase the bike is reving so much that the oil
has trouble getting to all the parts, and eventually the rings dont get enough oil, and instead of springing out like there suposed to they close.
Which causes lack of compression and hence no brum brum.

Well this is my theory, but i'm sure someone has a better reason than mine.
But i'm not entily sure my self.

Bare in mind i'm 17 and not a mechanic!!!!
____________________
Regards
Scott

[Dylan]

Could it just be the variator belt??? Never actually had a scoot. Did it actually go bang, or was this just for the story!!??~
Dyl

[hopoffbaby]

didnt go bang as such i kinda went hissssssss (like a punture)

[Robby]

check the plug. my CB did a similar thing and got very unhappy and it had just chewed thru a plug and blistered it all up. luckily it died as i was pulling into halfords car park.

[Scooby]

Full throttle for 30 mins dude, that's bad. I would expect the worst. Peds aren't very complicated so whip all the plastics off and find a baked bean can size cylinder.... that's where your piston will be

The cylinder head will be held on by bolts, so undo these and your piston will be in there. See if it moves up and down, if it does, it might be the piston rings siezing to the piston like Scotty said.
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A big enough hammer fixes anything!

[Ropehead]

My old tzr was totaly Nacked up (scored siezed spitting out bit of metal) but it still got me home.. had 2 rebore 2mm of it.

Its probably going to need
re-bore
piston kit
gaskets
£80+

Plus labour (i did it myself saves £££)

then uv got running it time a Good 700miles

U might get £250 scrap i got that for a sized up Kreg (crap) AR80

[Kickstart]

HI

I agree with Ropehead. When you kick the engine over is it very easy to do compared to normal? If so then it is probably down on compression. Likely cause of that is a hole burnt in the piston (unlikely, normally caused by using too low a grade of fuel which isnt really an option any more with only a single grade in most places) or snapped rings. If the rings have snapped (can easily happen if the engine nips up) then you may well have damaged the bore. If the bike has a steel bore you can rebore it to a slightly larger size and put an oversize piston in it (a rebore is cheap, £20 tops really). If it has a plated bore then you will either need to get it repaired and replated (~£100) or replace it with a new / 2nd hand one. You will also need a new piston with rings, and new gaskets to reassemble it.

All in all, depending on spares prices, likely best case scenario is about £60 (doing it yourself), worst case about £400 (paying dealer).

However, it could be other problems. Is it sparking? Main bearings could have failed and left you with knackered seals, leading to it drawing air in. However, the piston / rings are the most likely problem

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Scotty]

Wow, keith is actually saying what i said, i am privlidged.
Muhaha i do know something. not much but something!!
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Regards
Scott

[Ropehead]