Jetting 36 mm Mikuni

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Both those pilot jets sound way too small. Can you get it to idle properly with that jet? I am running a 280 main jet, 40 pilot, same needle jet and needle as you, needle position 2 (same as you) on an 850 Commando. Seems to be about perfect at 2500 feet. I get about 50 mpg at moderate speeds.


Neil said:
Hi,

Sorry to revive an old thread but I'm still not convinced the 36mm is running right. Just to recap; when I got the kit in June 05 it came jetted as follows:

290 Main Jet (280 and 300 also provided)
35 Pilot Jet (32.5 also provided)
6DH3 Needle
159 P2 Needle Jet
2.5 Slide
2.0 Airjet

I found this configuration caused the bike to run too rich. After some experimentation, I found this configuration was the best (so far):

Airscrew 2 1/2 turns out
260 Main Jet
27.5 Pilot Jet
Needle one position away from the weakest setting

The bike now appears to be running very hot and occasionally spits back through the carb. I've since ordered a 22.5 and 25 pilot jet - neither of them would allow the bike idle. The plug electrodes seem to be the correct colour (very clean) but still a little sotty around the centre which indicates to me it's still running rich.

Any ideas/ thoughts as to what to try next would be greatly appreciated.

Cheers,

Neil
 
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