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Makotosun

VM-30 main jet

  • hackman101
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VM-30 main jet was created by hackman101

Since my original carburetor got eaten up by the dustmeister, I bought a new VM30 and I'm about ready to put it on the bike since it's almost ready to start up. Minus cleaning the gas tank, that I decided I would look at the main jet. I find that the main jet on the new carburetor is labeled 280. It is an original Mukini, it's not a Chinese knock-off. The original carburetor has a main jet marked 250.

Is this something that I should swap over from the 280 to the 250 since my bike originally ran with the 250 jet? Or because it's a newer carburetor all be at the same number and practically the exact same thing in all likes and sizes as the original. Should I stay with a 250 or should I keep the original 280 in it? I am mixing my gas and oil so it shouldn't affect the gas fuel mix at all?

imgur.com/a/gPrvoE7

imgur.com/uvzmVWS
1973 MX250
Past rides 45 years ago (and longer)
1964 Honda 50cc C110
1960s Yamaha 65cc scooter
1960s Honda 65cc w/ 90cc engine mashup
1971 DT1-E modified to MX kinda...
Last edit: 20 Jan 2026 17:40 by hackman101. Reason: added info
20 Jan 2026 17:37 #1

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