The KT100S pistons are 56mm long and 23mm compression height.
It doesnt look like it would fit without machining a fair bit off the bottom of the cylinder and if piston ported may be too short?
The KT100J's are made for a bore of Ø50.0mm and would be very heavy at 56mm, the biggest i recall making was around Ø54.5mm for some agricultural/lawnmower situation.
Dimensionally they would suit better. 60mm length 33mm compression height.
You would have to spend alot of time lightening them.
They use the same outer die set as the KT100S which is roughly 58mm cast, but would also only clean up at around 56.5mm max.
Their gudgeon pin boss is thinner than the KT100S.
Yeah i remember getting all excited about the Js for 100cc -until I saw one
Don't you look at my accountant.
He's the only one I've got.
Yeah its a lot of space above the pin
here is Yows attempt
The pictures speak for themselves
No wonde everyone destroked.
Tis a shame as the KT100S pistons are just what the class needed only just a little too big in the bore.
if only there was a Strike KT100S piston on 50mm and above sizes.
Plus a strike KT100s up to 58mm
Pity Euro didn't make an AM8 engine. 100cc version of the AM5 or 6 but 99cc.
Hell I'll take it as a scaled down RSA but with crude restrictions to make it a roadbike while I'm dreaming.
Then we can spend our time tuning it to a standstill.
Don't you look at my accountant.
He's the only one I've got.
For destroking have you seen the eccentric big end pins:
https://www.sip-scootershop.com/en/p...tric_4043ad178
These can be used either for stroking or destroking or even illegally changing ignition timing on very controlled classes as someone got caught out for years ago.
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