Long story short... I was riding my bike a few days again and started to hear a knocking sound...immedietly stopped and switched the bike up...restarted it and the knocking was gone.... comtinued on my way and the knocking came back and the bike died
I checked around the bike and noticed I had no two stroke in my oil tank...looked clloser and reliased the pipe wasnt even connected... some ****** must have pulled it off..
ive stripped the top end...the sides of the piston are scratched up...rings look ok...top half of the barrel looked fine...but when i took it off completely i saw the bottom half of the barrel (where the piston stops before going back up) is scuffed a bit
rebore? heres some pics
looking down barrel
you can see here it was starting to scuff the top half of the barrle but you cant even feel it
Time for rebore and new o/s piston m8y N get the head and top of barrel checked to make sure it's not warped due to no 2t oil, it would of got feckin hot
Thought so...dont fancy a rebore as i dont to...well cant,wait weeks...the only local place charges the earth and his work is shoddy to say the least..
hmm what to do....what to do...
new from yamaha £500+
athena 170cc kit £450 plus a fortune if i ever need it rebored
gunna have to lose my ebay virginity i guess... lol
average rebore price is £25+vat youl find loads on the net you can post off to but i know what you sayin m8 iv got 2 cylinders that need a rebore an its hassle to get it somewhere specaily if your bikes in bits, its just easier to buy another whole top end barrel an piston for a spare m8 then you still have the transport no matter what
ive heard good things about pjme..and its much cheaper than my other options for sure my only problem is while its away being rebored im losing more money than im saving...so need the quickest fix possible cheers for the replies tho *waits for a reply with an offer of a head and barrle* lol
I'd say a make a few calls to see if there's anywhere else locally that can do it. £25 is about right. I got mine done for £18 at the local little motorbike shop in my small town and picked it up the next day. Order your piston, rings and gaskets from PJME (next day delivery) and take the barrel with your new oversized piston and get the barrel bored to suit the new piston. Try an engineering company too not just specialist motorbike places, it is just a standard engineering process you want them to carry out. Check what the clearance tolerance is supposed to be and tell them if you use someone like that because they won't know (should be in the service manual).
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Is that bits of piston ring firing out your tailpipe?
If you do take it for an over-bore with an engineering company, remember the head, the head gasket, and the power valve, all have to be sorted too, a bike workshop would know the specs to do this, whereas an engineering company won't.
Nev, do you reckon head, gasket and powervalve need to be altered on the first or second 0.5mm over size? I never touched mine when I went to +1.0mm and i never noticed any ill effects??
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Is that bits of piston ring firing out your tailpipe?
Aye the gasket and head deffo, not sure about powervalve mind, I had mine over-bored to 2.4mm and the valve needed grinding down big time, below 2.4mm not too sure.
The gasket because it would have a lip if it wasn't, and the head beacause of the different clearance volume changes. Why they don't make oversize gaskets to suit, gawd knows, but they should do.
-- Edited by NEV on Tuesday 22nd of November 2011 01:32:44 AM
-- Edited by NEV on Tuesday 22nd of November 2011 01:35:20 AM
-- Edited by NEV on Tuesday 22nd of November 2011 01:36:37 AM
