Author Topic: B1 Scooter 175 piston advice please  (Read 107 times)

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FizzyG

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B1 Scooter 175 piston advice please
« on: 20 October, 2021, 20:27:14 »
Hi all

Just asking if anyone could help with this issue please ?

On the parts list from an library archive notification, it denotes the part number for a standard piston as 44290 -1430

This is shown as a 2 ringed piston, however the removed piston has 3 rings,

Looking through replacement options it looks very similar to a D7 piston.

Could this be correct?, or what are my options to get a replacement please.

If we have any scooter advice available, I would be grateful
Kind regards
Andy

 

Dean Southall

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Re: B1 Scooter 175 piston advice please
« Reply #1 on: 22 October, 2021, 09:19:17 »
The B1 scooter engine is based on the Bnatam engine so I would not be at all surprised that its takes a D7 piston.
I would expect to to have  2 rings.
You should be able to pick up a second hand Bantam piston cheaply enough to trial fit and measure up.
BSA: turning ordinary men into mechanics since 1910

JulianS

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Re: B1 Scooter 175 piston advice please
« Reply #2 on: 22 October, 2021, 10:26:13 »
Bantam piston 90 1430 was superseded by piston 90 1459, which had 3 rings, on this 1962 parts service bulletin. So may explain.

FizzyG

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Re: B1 Scooter 175 piston advice please
« Reply #3 on: 22 October, 2021, 12:11:06 »
Thanks all

That explains why

Thanks again this is most helpful

Andy