3M 140 Engine tuning

[Park, Ihncheol]

 Hi, All,

I just got back from field trying to run my 3M 140, Asano 140 tuned pipe,
standard header (O-ring).
APC 17x12, Coolpower 15%.  Distance from the center plug to first baffle is
26 and 5/8 inches. OS A5 on center, F in the back.
I get 7800 rpm at full throttle. However, from idle to half throttle
(throttle barrel opened approximately 50%).  The engine vibrate too much
and die.

Since this is my first large 2 stroke (OS 91 was easy to tune), I have no
idea why the engine behave like this.

Any idea?

Thanks,

Ihncheol Park


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