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Rejetting Carbs: In Search of Free Lunch

LeeGS550E said:
They mislead you in that part of the article. If you read to the end, they go on to talk to a Mikuni engineer who points out there are different types of pilot jets. Turns out they're using the wrong ones when they drop to a 30, and by the end of the article, after getting the proper BS type of pilot jet, they jump UP to (if I remember right) a 47.5.

I think I'll end up shimming my needles up, not down. Still stumbling from just off throttle to 1/4 throttle.
Click to expand...

You are right, the CW guys were not experts. They were using VM jets in the BS carbs. :p The experts in that article was the Mikuni engineer that caught their mistake
 
My closest GS tuning buddy, Distraction628, has also recommended I use the pilots with the emulsion holes - were those available back in the day?
 
LeeGS550E said:
They mislead you in that part of the article. If you read to the end, they go on to talk to a Mikuni engineer who points out there are different types of pilot jets. Turns out they're using the wrong ones when they drop to a 30, and by the end of the article, after getting the proper BS type of pilot jet, they jump UP to (if I remember right) a 47.5.

I think I'll end up shimming my needles up, not down. Still stumbling from just off throttle to 1/4 throttle.
Click to expand...


That makes more sense. Selective reading on my part. When the numbers were not adding up suppose I read through the rest with not much interest.

The pilot jet for the VM the orifice is above the emulsion holes, then the BS pilot is at the base. You would think with all the work they were doing jetting it would be obvious visually. From the article quiet a bit of difference in fuel delivery between the two. Dropping the height changes the pressure feeding the orifice. Interesting enough. Will put that into the mix of jetting these VMs just to see what happens with the AFR.
 
So, the solid ones were more like a "Bandaid"? :eek:


Sort of like the little rubber caps.

Or, Mikuni decided that they need to switch it up some to gain more sales on parts, given most tuners had a vast selection of jets.

We may never know the truth...:D


I believe you are right on the pilots bleed holes came first.
 
ANyone have a set of 47.5s that are KNOWN to be not screwed with that have emulsion holes? I have a set of them, dunno if they'd been monkeyed with (drilled?) but MY 1100ES (which did NOT have emulsion type pilots) simply WOULD NOT idle with those jets...again, I dunno if it had to do with the emulsion holes, or if the jets had been drilled (i pulled them from a bike that was used as a drag bike..those crazy guys do all kinda stuff) but id be curious to see. I ALSO had VERY large Air Correction jets in my carbs (180) when everything ive read says they're supposed to be 160s or 170s... I wonder also if the type of jet had anything to do with it...
 
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