Engine specs

Anybody have the engine specs for a 1981 Express Sr NX 50?

I want to build an expansion chamber using the exhaust calculator app. Need to know exhaust duration, port size, width, height, length, and a coefficient. Thanks on advance.

Re: Engine specs

You'll need to do the measuring yourself on that. It seems just about every variant of express has slight differences about some or all of it's details.

Re: Engine specs

Bob Payne /

I was hoping to not have to tear it apart.

Re: Engine specs

It's a scooter with tiny lil tires...………..should be in OFF TOPIC forum Bob.

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