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Main Jets for Techumsey Engines

Posted by rolm (My Page) on
Thu, Jul 15, 10 at 10:24

I see numbers on the buttom of the jets example 169 or 172 or 174, is the larger jet with the higher or lower number.

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RE: Main Jets for Techumsey Engines

Rolm: My working knowledge indicates that the Higher number indicates
Larger Jet Eg: Mikuni #140 , #160 , #180 Main Jets were sized accordingly . Same with Keihein and Walbro Smooth Bore which required re-jetting even when a temp change of 20-30 let alone Barometric Pressure via Altitude Changes occurred back during my Snowmobile Racing Days lol . I would assume same for your application , have you checked the Tecumseh Site ?

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