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Author Topic: 1988 Duncan national motor  (Read 783 times)

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1988 Duncan national motor
« on: April 06, 2014, 06:06:28 am »
I have a Duncan national motor that I took on its first long ride yesterday. I am running the national kit with a dyno port big volume pipe and vforce reeds. Being around two strokes my whole life the motor felt normal with tons of power. I let my younger cousin ride it who is a die hard 4 stoke guy and he said it felt like it was breaking up at a lower rpm. To me it seems like the 2 stoke chop before power band. Like crushing down the road with a load it feels super smooth. Lower rpms just putting its choppy. My opinion is he's not used to a big bore 2 stroke (aka mans quad).  Any thoughts?
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Re: 1988 Duncan national motor
« Reply #1 on: April 06, 2014, 10:42:23 am »
Well opinions are like asoles, everybody's got one!

Could be the pipe/port combo where its not on the pipe and pulling as hard.

I'd agree with you, your asole cousin is dispensing advice from his knowledge base where he might not be so proficient.

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Re: 1988 Duncan national motor
« Reply #2 on: April 06, 2014, 11:00:03 am »
Breaking up on the low end....

Tell him you need to get it on the pipe and twist the throttle !
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Re: 1988 Duncan national motor
« Reply #3 on: April 06, 2014, 11:41:38 am »
Probably the pipe not matching the port work. 
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Re: 1988 Duncan national motor
« Reply #4 on: April 06, 2014, 11:58:44 am »
What is meant by "breaking up?"  To me, this sounds like a jetting issue.
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Re: 1988 Duncan national motor
« Reply #5 on: April 07, 2014, 05:42:21 am »
x2, i am with moto
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Re: 1988 Duncan national motor
« Reply #6 on: April 07, 2014, 08:25:42 am »
'The motor felt normal with tons of power'

That's why I said 4 stroke pilot needs to get it on the pipe/wind it out more
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Re: 1988 Duncan national motor
« Reply #7 on: April 07, 2014, 09:42:32 am »
The last time a 4-stroke rider piloted my 500 they fouled the plug. I agree with Dez.
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