Carb Jetting Revisited

External Since: Apr 29, 2005 Posts: 762

After work this evening I went and picked up the old RM from
storage, brought it home, and tore into the carburetor to see exactly
what the jetting was...

Just as I figured, totally stock. 320 main, 50 pilot and needle in
the second (from the top) groove.

I already ordered 310, 300 and 290 mains of the correct fitting,
but I apparently screwed up by ordering NON-BLEED 45 and 42.5 pilots
(because the pilot in there now has four bleed holes). Am I correct in
assuming that these non-bleed pilots won't work in my application?

Also, from Motorcycle Superstore both the regular and non-bleed
pilot jets come in 42.5 and 47.5 in addition to 45. Since the
suggested size for Baumgartner altitude (and my application) is 46 (as
provided by David Smith), should I acquire all three sizes and put in
the 45 before departing?

Thanks for the help!

CrashTestDummy - '85 RM-250
f.j.bradfordREMOVE DeleteThis @verizon.net

External Since: Apr 23, 2006 Posts: 218

I was at the Mammoth Motocross a few years back and had a chance to
talk to Ty Davis between motos. I asked him about jetting and he said
he goes down two main sizes for that race and leaves the pilot jets
stock. (8000 feet). OF