Home Forums Shifter Karts CR80 Jetting help

This topic contains 3 replies, has 3 voices, and was last updated by  Bob Schabel 3 years, 3 months ago.

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    Bob Schabel

    I have a CR 80  modded engine, Mikiuni car, pump around system. 85 degrees F  Need a suggested main jet starting point.


    Greg Lindahl



    Gary Smith

    Hi Bob,

    Are you running an airbox or a K&N style air filter?

    What altitude are most of your tracks?

    Most of my tracks are about 1,000 feet above sea level, I run a K&N style air filter, I am running a 195 main.

    If you are running an airbox, I would try 190 or 185, I’ve heard go down 2 jet sizes for an airbox.

    What ever you do, check your plug every time you make a jetting change. You are looking for the center insulator being brown to light tan, if it is white or gray, you are too lean.

    Hope this helps.


    #55 Honda CR80


    Bob Schabel

    thanks, I run  KN style air filter, alt=700ft.   I run a 195-200 in my stock motor. was told by someone for the mod motor needed a 380-360 jet?    So, thanks for the help, I’ll start at 200 and see what the plug tell me. bob

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