Vintage Dirt Bike Q & A

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 Post subject: 1974 MX250 Jetting
PostPosted: Wed Jun 08, 2016 8:15 pm 
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Joined: Sat Jan 04, 2014 1:07 am
Posts: 19
Hello,

I just picked up a 74 MX250. The bike starts on the first kick and pulls strongly at the bottom of the rev range, but sputters and will not rev out.

Does anyone know the spec jetting and initial needle settings for this bike?

I plan to check the carb internals to make sure jets are not clogged.

Thank you,
Ben


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 Post subject: Re: 1974 MX250 Jetting
PostPosted: Mon Jun 27, 2016 2:00 pm 
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Joined: Fri Jan 24, 2014 12:39 pm
Posts: 55
Stock main jet is a #280 and it used a 6dh3-3 needle. Clip should be in the middle groove. #60 pilot jet.


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 Post subject: Re: 1974 MX250 Jetting
PostPosted: Tue Aug 09, 2016 1:35 pm 
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Joined: Sat Jan 04, 2014 1:07 am
Posts: 19
Tnr - thank you for the jetting information.


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