Re: Proma or Tecno circuit for magnum

Totally normal JBOT /
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I think you might be better off just to do a little bit of porting and surfacing of the head.

If you don't run an expansion chamber you can get away with pretty high compression.

So here's some good specs for your stock exhaust and 15 mm carb.

So this is what you should do get a intake manifold that has a smooth bend in it.

Your piston Port timing should be about 135° to 138 degrees.

Shimmy your cylinder up 1 mm to raise the transfer ports.

But if you're patient want to open up the transfer ports you want to get those in about a 120 to a 122° range.

And your exhaust Port timing in the range of 160° to 164°.

That should get you close to about three and a half horsepower and you should be able to cruise close to 40 mph with your stock exhaust.

And set your timing at 18°, you might even be able to get away with 19° since you're not running a pipe just watch your temps (edited)

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Subject Written By Posted
  Proma or Tecno circuit for magnumTopic by: Erin L Erin L 07/31/21 06:07PM
  Re: Proma or Tecno circuit for magnumRe: Sir Clip Sir Clip 07/31/21 06:12PM
  Re: Proma or Tecno circuit for magnumRe: Probably Fred Probably Fred 07/31/21 08:09PM
  Re: Proma or Tecno circuit for magnumRe: Totally normal JBOT Totally normal JBOT 07/31/21 08:14PM
  Re: Proma or Tecno circuit for magnumRe: Erin L Erin L 07/31/21 09:17PM
  Re: Proma or Tecno circuit for magnumRe: Graham Motzing Graham Motzing 07/31/21 10:11PM
  Re: Proma or Tecno circuit for magnumRe: Erin L Erin L 08/01/21 08:47AM
  Re: Proma or Tecno circuit for magnumRe: Graham Motzing Graham Motzing 08/01/21 09:36AM
  Re: Proma or Tecno circuit for magnumRe: Totally normal JBOT Totally normal JBOT 08/01/21 10:41AM
  Re: Proma or Tecno circuit for magnumRe: Full Tuck Full Tuck 07/31/21 11:31PM
  Re: Proma or Tecno circuit for magnumRe: Totally normal JBOT Totally normal JBOT 07/31/21 11:38PM
  Re: Proma or Tecno circuit for magnumRe: Erin L Erin L 07/31/21 11:49PM
  Re: Proma or Tecno circuit for magnumRe: Totally normal JBOT Totally normal JBOT 08/01/21 02:14AM
  Re: Proma or Tecno circuit for magnumRe: Graham Motzing Graham Motzing 08/01/21 09:38AM
  Re: Proma or Tecno circuit for magnumRe: EH FCC of the QCB EH FCC of the QCB 08/01/21 10:13AM
  Re: Proma or Tecno circuit for magnumRe: Erin L Erin L 08/01/21 11:23AM
  Re: Proma or Tecno circuit for magnumRe: Totally normal JBOT Totally normal JBOT 08/01/21 12:05PM
  Re: Proma or Tecno circuit for magnumRe: EH FCC of the QCB EH FCC of the QCB 08/01/21 01:22PM
  Re: Proma or Tecno circuit for magnumRe: Totally normal JBOT Totally normal JBOT 08/01/21 01:44PM
  Re: Proma or Tecno circuit for magnumRe: josh n josh n 08/09/21 02:58AM
  Re: Proma or Tecno circuit for magnumRe: Probably Fred Probably Fred 08/09/21 04:53PM
  Re: Proma or Tecno circuit for magnumRe: Totally normal JBOT Totally normal JBOT 08/09/21 05:04PM
  Re: Proma or Tecno circuit for magnumRe: josh n josh n 08/09/21 07:38PM

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