RCU Forums - OS 91 small head df

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tinsletown

11-02-2006 05:37 PM

OS 91 small head df

I installed a new set of bearings and crank shaft into my engine.
I now have a dead spot at TDC is this normal till after break in?

Bax	11-08-2006 12:10 PM

RE: OS 91 small head df

A tight spot when the piston is at Top Dead Center is normal. You have an ABC-type of engine.

Please see: http://www.osengines.com/faq/product-faq.html#q1

While the FAQ describes the ABN engines, ABC engines are very similar in construction and would be handled the same way.

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