Re: Tomos A3 wrist pin bushing, 50cc kitted engine

Paul Archibald /
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Treats told me just a few days ago that the bush to use a 10mm pin in a 12mm piston does not exist.

My question to Treats followed by their response.

Hi,

I have a 1986 Tomos A3 and a 50 cc Airsal kit for a Puch Maxi of a similar era (1980). I would like to fit the Puch kit to my Tomos can you please tell me what I will need apart from a 12mm internal diameter bearing for the wrist pin? I also have a 15mm Bing carburettor which came with the kit and would like to use this too if possible. Can you supply an inlet manifold which would be suitable for the Bing or perhaps a Dellorto sha15?

Thanks in advance for your help, any advice will be appreciated.

Regards,

Paul

Q

questions@treatland.tv

to me

4 DecDetails

Hi Paul, You would need to change the crankshaft, cut and reweld the pipe to a different angle, and perhaps make a custom intake for this to work, so it will for sure not be worth it. I would probably get https://www.treatland.tv/tomos-A3-airsal-kit-p/tomos-a3-airsal-kit-02210544.htm plus intake and dellorto SHA instead or find a good stock A3 replacement cylinder. We may have a used one around if you want us to look. Thank you!!! Treats

Hope this clears things up, their answer is to change the crankshaft or buy their 44mm Airsal kit with a 10mm pin. The answer re the Bing carburettor was what I suspected but I had thought they would suggest the bush if the roller bearing wasn’t available as a few people have mentioned it before. If it does exist can someone please give me the part number. (edited)

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Subject Written By Posted
  Tomos A3 wrist pin bushing, 50cc kitted engineTopic by: Aled Williams Aled Williams 05/18/19 10:32AM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Brad William Brad William 05/18/19 10:46AM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Aled Williams Aled Williams 05/21/19 03:00PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Graham Motzing Graham Motzing 05/21/19 05:48PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Graham Motzing Graham Motzing 05/18/19 10:51AM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: spencerrrrr r spencerrrrr r 05/18/19 12:06PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: pat splat pat splat 05/18/19 01:09PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Brad William Brad William 05/21/19 01:25PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Daniel '' Daniel '' 05/21/19 01:16AM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Paul Archibald Paul Archibald 12/18/20 04:26PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: EH 📣FCC of the QCB EH 📣FCC of the QCB 05/21/19 10:11AM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Aaron Blair Aaron Blair 12/18/20 04:30PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Paul Archibald Paul Archibald 12/18/20 05:12PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Matt Mulligan Matt Mulligan 12/18/20 06:26PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Paul Archibald Paul Archibald 12/18/20 05:27PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: P D P D 12/18/20 05:30PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: b to the eff b to the eff 12/18/20 08:04PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Andrew Wrase Andrew Wrase 12/21/20 08:18PM
  Re: Tomos A3 wrist pin bushing, 50cc kitted engineRe: Totally normal JBOT Totally normal JBOT 12/21/20 08:56PM

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