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197/250 change

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197/250 change

Post  bart on Tue May 10, 2016 7:41 am

Can someone tell me which is a direct replacement for a 10e piston/barrel to convert it to a 225/250 ? a 1H maybe,   just considering it for the future..

bart

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Join date : 2011-03-15
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Re: 197/250 change

Post  Ted Snook on Tue May 10, 2016 9:39 am

1H pistons are like Hens Teeth....due to b****ers using them up to make 225cc trials motors from 197s. They were no faster anyway - just a bit more torque.
A good re-bore mod nevertheless, but if you find a piston, tell John and get it to a deserving Cruiser person. Best way out is to get a 250 motor.
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Ted Snook

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Re: 197/250 change

Post  bart on Tue May 10, 2016 10:05 am

no matter, thanks anyway, i will keep looking for one .........

bart

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Re: 197/250 change

Post  fulmar88 on Tue May 10, 2016 11:13 am

I didn't want to mis-remember the facts so did a search and found this posting from JH a couple of years ago.

'The engine should be capable of 50mph on the flat with relative ease, but top speed will only be in the region of 60mph in favourable conditions, boring the barrel out to 63mm and fitting a 1H piston will improve it , or the complete top end from a 31A will fit straight on and increase the capacity to 250cc ( it does have to be a 31A top end as the 32A will necessitate the change of conrod as well) look for a 250 cc/ 66mm bore cylinder with the same flange thickness as your 10E engine.
JH'

regards,
Steve.
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Re: 197/250 change

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