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Intake & Exhaust The ins and outs - carburetors, manifolds, mufflers, expansion chambers and more to keep your engine running the way you like

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Old 11-06-2016, 10:56 PM
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Chaz Chaz is offline
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Default NT carb - basic and speed jet size

I've done some research here and am still unsure about whether or not there is a different size jet for the stock basic nt carb compared to the nt speed carb. Has somebody measured? I don't have the tools to measure myself.

thanks,

Chaz
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Old 11-07-2016, 01:48 AM
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Default Re: NT carb - basic and speed jet size

I found that they were the same, 70.
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Old 11-07-2016, 01:58 PM
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Default Re: NT carb - basic and speed jet size

Thanks for the reply, MBR. I guess I'm going to have to get a pin vise and micro bits to dial this thing in.
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Last edited by Chaz; 11-07-2016 at 02:08 PM.
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Old 11-07-2016, 05:00 PM
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Default Re: NT carb - basic and speed jet size

I found biknut's dissertation on the speed carb. Up until now, I thought they were identical with the exception of the filter.

http://motorbicycling.com/showthread.php?t=37986
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Old 11-07-2016, 08:30 PM
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Default Re: NT carb - basic and speed jet size

Thanks for posting that link, Agreen. I can see the throat is bigger on the speed carb if I look at them side by side. I was hoping the stock carb had a smaller jet.

I suppose I should just bust open my wallet and get my yz80 expansion chamber put on. If I do that, with any luck I might get away without having to change jets.
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