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General Category >> Rubber Side Down! >> Murray's carb jetting (calling all thumper Paul's)
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Message started by Surviving Philly on 10/23/25 at 06:26:17

Title: Murray's carb jetting (calling all thumper Paul's)
Post by Surviving Philly on 10/23/25 at 06:26:17

Yo savages,

The vm36 offered by Murray's carbs -- does anyone know the jet sizes he provides? I need to step up my pilot jet, it's idling too lean, want to know where to start without pulling the jet.

Thanks all

Title: Re: Murray's carb jetting (calling all thumper Pau
Post by LANCER on 10/23/25 at 08:56:30

What is the number on the pilot jet in the Murray carb ?
I assume he is using genuine Mikuni jets…hopefully.
Most of the VM carbs I have sold are setup initially with a #20, or occasionally a #17.5 pilot jet. I also include extra pilot jets, higher & lower, in case they are needed.
The same goes for main jets, my initial setup is with a #195 or #200 main, plus extras.

Title: Re: Murray's carb jetting (calling all thumper Pau
Post by ThumperPaul on 10/23/25 at 10:03:47

You’re going to make me find my old post about the Murray jetting….

Murray uses a 27 pilot jet (maybe it was 27.5…can’t remember exact increments for those jets) and a 165 main jet if I recall correctly. I never did understand how Lancer was using a 20. Lancer was also recommending a 180-200 main jet.

I ended up keeping the 27 pilot jet and bumping up from 165 to 200 main jet. So, I kinda mixed and matched these guys guidance. My idle was never a problem, but I was missing a lot of top end with the 165 main.

I think Lancer also recommends the middle grove for the clip on the needle. Murray had it at the 2nd groove from the top (leaner). I moved the clip to the middle groove.

Murray got all pissed off, offended, and defensive when I tried to discuss it with him. He said he used a dyno which I think was total BS. If he had, he would have posted a dyno chart to sell his genius.

I can’t remember exactly where I had the air fuel mix screw set with the 27, but it was in a normal range of 1.5 - 2.5 turns out. Have you tried adjusting it? You’ve been running and idling fine until now - I suspect your pilot jet is partially gummed up and dirty. The 27 should NOT be too small and lean.

In 20/20 hindsight, a 27 pilot and 190 main with the clip in the middle would have been better. The 200 main was a little too big with the dyna muffler.