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1974 mx360 jetting with 38mm Mikuni
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Author:  mrmikkelsen [ Thu Jul 08, 2010 3:53 pm ]
Post subject:  1974 mx360 jetting with 38mm Mikuni
I don`t have the original carb with the basket case I am putting together, so I grabbed a 38mm Mikuni round slide I had hanging around and I figure I'll try it out. I am thinking the numbers below are pretty good start at the jetting, but I have no experience with these 360's at all. Mine is stock with the exception of this carb, Boyessen reeds and a new 1st over piston. How close is this going to be for near sea level use? Any input will be appreciated! Thanks! Jon

360 main jet
50 pilot
6F15 needle, middle groove
159-P8 needle jet
2.0 slide cutaway
Author:  rossvickicampbell [ Mon Jul 19, 2010 8:23 am ]
Post subject:  Re: 1974 mx360 jetting with 38mm Mikuni
might be a little rich on the pilot but not too far off to start with.
Author:  mrmikkelsen [ Wed Sep 01, 2010 9:14 pm ]
Post subject:  Re: 1974 mx360 jetting with 38mm Mikuni
Here's a post-track run update.

I am down to a 270 main now, and the top end really cleaned up. It was blubbery fat with the initial settings. The pilot is at a 50 or 45 - oops, I forgot. The needle is unchanged, except that the clip is now at the very top groove, or leanest setting. It runs cleans everywhere with good throttle response.

The only real unknown I might look into is which step would be the next leanest needle jet set to install so I could be in the middle groove and have some more experimentation room?

I shouldn't be surprised that the low end isn't a super grunt monster, but man alive does it ever rev out great!

Anybody got a set of Works shocks you want to sell for it?

Thanks for the advice. It was good to know the initial setting were a reasonable starting point.
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