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The 2-Stroke Garage => Turning Wrenches => Topic started by: scot511 on July 04, 2025, 12:07:34 PM

Title: Mikuni VM/TM jetting question
Post by: scot511 on July 04, 2025, 12:07:34 PM
I have a 1971 Suzuki TM400 that I converted to a street tracker about 10 years ago.  It's currently has an ordinary Mikuni VM34 and it runs fine on 32:1. Recently I came into possession of a new TM36 flatslide and manifold which seems to be jetted for a jetski.  Does anyone here know of a way to cross-reference the jetting in the VM over to the TM or have any ideas on what jets I should start out with?  I'm running a Circle M pipe.  Thanks in advance.
Title: Re: Mikuni VM/TM jetting question
Post by: m in sc on July 04, 2025, 03:09:18 PM
honestly has more to w the jet tube and needle. you're just going to have to experiment and tune. that being said, def watch out for the needle and seat size for the float. a lot of jet skis use a small fuel pump (vacuum) and the needle and seat isn't big enough for a gravity feed. make sure you're at a 2.5-3.0 seat, minimally.  I've been bit by this myself
Title: Re: Mikuni VM/TM jetting question
Post by: busa1300 on July 05, 2025, 07:59:39 AM
Quote from: scot511 on July 04, 2025, 12:07:34 PMI have a 1971 Suzuki TM400 that I converted to a street tracker about 10 years ago.  It's currently has an ordinary Mikuni VM34 and it runs fine on 32:1. Recently I came into possession of a new TM36 flatslide and manifold which seems to be jetted for a jetski.  Does anyone here know of a way to cross-reference the jetting in the VM over to the TM or have any ideas on what jets I should start out with?  I'm running a Circle M pipe.  Thanks in advance.

What jetting does your current carb have?