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lam1962brettagg wrote:thanks for your input Nick.
cant see any cracks on the cylinder but find it odd that it only partial seizes at 6 miles or so.
no marks on the piston apart from small seize score on exhaust side. will check clearance again though. and have the cylinder honed anyway.
NorthernJordan wrote:After 6 miles or so it's likely that the piston is only getting up to temperature and then expanding leading to a seize.
Like I say the exhaust port side is always hotter so you are likely to see the results of a soft seize in this area.
If you can't see any cracks then I think you might be over thinking it - easy to do when you are having issues with your own scooter....
Check bore clearance with piston(stickies book has good advice), rebuild and perform a leak down test (plenty of good threads on how to do one on here). Once you have done that report back with your findings and maybe supply a picture of your plug colour.
hullygully wrote:"the i had a new piston and rebore. the engine would seize after six miles or so. (soft seize)"
how many miles had you done with the above rebore & new piston?
gp200ts1 wrote:I've got a 150 barrel you can have for the price of postage. i have a few which could be li, sx or gp. all 150 but would benefit from a rebore and a new piston fitting.
lam1962brettagg wrote:hullygully wrote:"the i had a new piston and rebore. the engine would seize after six miles or so. (soft seize)"
how many miles had you done with the above rebore & new piston?
Hi
went out on it a number of times. probably 5 or 6 times. every time the same. all in all probably did about 30 or so miles.
hullygully wrote:so, if you've only done 30 or so miles on a new rebore & new piston, presume you're only doin 30 miles/hr @ 25:1?
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