Mikuni Jetting?? - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 4 (permalink) Old 01-02-2013, 04:25 PM Thread Starter
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Mikuni Jetting??

I have had a varriety of mid 80's sleds with Mikuni carbs,
but the ones in question are 1986 safari 377s.
i am used to the jet being about 1 3/4" long(on just about every sled ive worked on)
my 86 377 is just like that, but i am helping my neighgbour work on his 86 safari 377(identical to mine) and the jet in his is about 3/8" long.
Ive never seen one so small, i dont understand jetting, so im looking for a quick rundown,
ps.. we are in the rocky mountains, i believe a fare elevation, mine runs great, his wont idle, both are single carb setups.
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post #2 of 4 (permalink) Old 01-02-2013, 05:41 PM
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www.hlsm.com should show you the differences. Which jet?

1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
1992 Ski Doo Mach 1 original
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post #3 of 4 (permalink) Old 01-02-2013, 07:18 PM Thread Starter
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i believe it is the main pilot jet, it threads up into the bottom of the carb from inside the bowl, the diagrams on hlsm show very little detail. im wondering about the theory behind jetting, more holes, different sizes, length of jet tube, etc
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post #4 of 4 (permalink) Old 01-03-2013, 03:55 AM
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The jet itself is a small (3/8) screw looking thing that has a hole in the middle of it t osuck fuel up into the carb. They have different size holes (jet size) screws if you need to change jetting. The long screw types are on the older Tillotson carbs. Go to the carb cleaning tutorial in the how-to's section of this forumand you'll see a better picture of the main and pilot (idle) jets.

1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
1992 Ski Doo Mach 1 original
2006 Ski Doo MXZ 500SS
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