Vintage Dirt Bike Q & A

I have a new to me 1974 mt250 I am installing a original carburetor back on , I would like to know the original needle clip position or if someone has a better suggestion , I live at 480 ft above sea level and will be using 90 octane no ethanol fuel. I plan on using the original low speed and main for a baseline, my clymer Manuel does not mention clip position , thank you for your help

The original needle clip position is in the #3 down (center) groove. I found the #2 position to be too lean, for what that's worth.

If your bike has a 122 main jet that should be pretty close, and if it has a 60 pilot you may find that to be one or two sizes too rich. I never tried a 3.5 throttle slide, but that made a big improvement on my MR175 (basically the same carb).

If the carb leaks no matter what you do, make sure the fuel cap vent is clear.

Ray

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'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric

Ok i will try the number 3 position , and thanks for the tip on the vent! I will be testing soon I hope