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JAP 80cc timing

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JAP 80cc timing

Post by makedoandmend on Sun Apr 08 2012, 07:49

I am fixing up a little JAP 80cc two stroke and I need to know the point at which to set the timing, can anyone help?

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Re: JAP 80cc timing

Post by Foden on Mon Apr 09 2012, 19:09

Hi, there are various models of the small JAP stroker so I am uncertain which model you have. However, the Model O is timed at 3/32nd" before TDC and the Model 34 is timed at 5/64th" before RDC. There is also a Model 80 but I have no spec for that, but I would think that somewhere similar to above wont be too far out.

Pete.

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RDC

Post by makedoandmend on Wed Apr 11 2012, 16:09

Thanks Pete,
I tried it at 3/32 before tdc and it tries to fire then I timed it at TDC and it really wants to run but won't keep going , but what is RDC?

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Re: JAP 80cc timing

Post by Foden on Wed Apr 11 2012, 16:20

makedoandmend wrote:Thanks Pete,
I tried it at 3/32 before tdc and it tries to fire then I timed it at TDC and it really wants to run but won't keep going , but what is RDC?

A TYPO!!! Embarassed Should be TDC, sorry.

Pete.

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Re: JAP 80cc timing

Post by makedoandmend on Thu Apr 12 2012, 07:33

Thanks Pete,
5/16ths might do it, as I said its close to working at 3/32 so I,ll give it a go and put up a post if it works.

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