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440's necessary
01-07-2004, 04:15 PM
I have a duncan national 440:

I have an fcr 39 mm carb:160 main, needle is in the middle,
I run lrd exchaust and I cut half the lenght off my lrd silencer.
I gained horsepower, I can go through 10,000 with power. It screams like a two stroke. Once I got it dynoed, My quad came alive.

I definately recommend a dyno.

smiley