Dyno Jet Jet-Kit Is Crap! AFR Dyno Results;

[JungleJustice]

Nope - I have to get back to the dyno with this machine! (Just got done doing the two 2-stroke V4 bikes on the CarbCon dyno in Kirkland a few weeks ago to get them dialed in a bit more!) The Suzi has been running pretty good, so I haven't felt the need, but I DO want to go and verify it soon - a few minor hiccups here and there...

[1948man]

So is the consensus that smaller Pilot-Air jets do indeed lean out the mixture? How does that work? Do the pilot air jets influence how much fuel is sucked into the mixture? I'm dyno-jetting my 1100 2 valve and have stock 170 pilot air jets.

[1948man]

Bumpity Bump

[posplayr]

So is the consensus that smaller Pilot-Air jets do indeed lean out the mixture? How does that work? Do the pilot air jets influence how much fuel is sucked into the mixture? I'm dyno-jetting my 1100 2 valve and have stock 170 pilot air jets.

Have you read your manual? I woudl gather a bigger air jet would make things leaner ; but the manual would know for sure.

[blowerbike]

i love the misinformed title of this thread

[Billy Ricks]

Yeah, it's news to me.

[1948man]

I'm happy with Dynojet. I don't think the answer to the question is in my manual. I thought it was kind of a general question about carburetors. Dynojet sends 160 pilot air jets to "lean out the bottom end" for 16 valve gs 1100's from '80 to '85. Those bikes come stock with 180 pilot air jets. The original poster thought it was counter-intuitive that smaller jets would result in a mixture with more air in the air/fuel ratio. Crazypaint agreed the smaller pilot air jets resulted in a leaner condition. I was just wondering if there is any agreement on this. It seems counter-intuitive to me also but I was hoping somebody understood the theory of how this works.
Edit: By manual I was assuming my Gs 1100 gl owner's manual. The Dynojet paperwork states the smaller jet produces a leaner condition.

[Katarat]

http://jockeyjournal.com/forum/showt...hlight=dynojet Mikuni to dynojet chart

[1948man]

If I read the chart correctly, the 160 dynojet equals a 150 Mikuni so that makes it even more smaller than the stock 180 jet. Yet the smaller jet (by 30?) yields more air in the mixture?

[chef1366]

I don't think the pilot air jets are different

[1948man]

I measured the 160 pilot air jets by finding different objects like large paper clips, finishing nails etc, that would fit in or barely not fit in the orifice. I measured the objects with my calipers. I agree the 160 pilot air jets from dynojet are 1.60 mm. The reason my kit included the 160 pilot air jets is I accidentally got the kit for the 16 valve motor the first time.