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Author Topic: Jetting help  (Read 1232 times)

Offline MotorGeek - Jerry Hall

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Re: Jetting help
« on: June 07, 2018, 07:37:16 am »
Man, do the 2.0 pipes need that much main?

How worn is the slide on your carb?

If it was me, I'd start around 35/440-450

What position is the needle?

A worn slide or slide channel will not affect the main jet size, it affects the idle mixture and the repeatability of the idle speed each time the throttle is closed. 

The main jet size is affected by the restriction of the muffler/stinger and the restriction, resonance of the air filter and intake pipe design.

An exhaust system that has more restriction in the muffler and stinger will require smaller main jets than an exhaust system that has a larger and or higher flow rate outlet.  An intake system that has more restriction will require smaller main jets.

Porting does not affect the main jet size very much unless the porting is really screwed up, it is the exhaust and intake restriction that has the largest effect.

Stingers and mufflers that have a lot of time on them will have more restrictions because the layer of carbon inside of the these passageways reduces the flow. 

Highly developed pipes will often need the inside of the pipes cleaned/ decarbonized every 50 hours or so.  Pipes with too much carbon on the inside of the pipe will also raise the RPM where the engine makes its peak power and torque.

 

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