Apparently I have an elusive air leak.

• Author: ZackE (---.hsd1.co.comcast.net)
• Verified User: zakre
• Date Posted: 05-15-08 21:45

Yes, I know how to do a quick test for one. I’ve done it a few times now, and found nothing.

Sprayed around pipe, case/jug, jug/head, intake, and decomp.

No change in RPMs at idle.

I’m told I might have an air leak, as I’m running lean a 109 jet.

Peugeot 103, polini bottom end, 50cc polini kit, stock head (for the moment).

4-petal reed valves, 19mm dellorto phbg with rubber mount, currently held with pvc tubing clamped to a shortened intake, barely slides over both ends, and I’ve got clamps on those.

So it’s a 109 main jet, 45 idle jet (which is lean at idle, but it’s the highest I was able to get my hands on for the moment).

Needle pulled up all the way.

Mixture screw cranked out quite a bit.

Getting mostly white, with a bit of a brown smear on plug chops.

I was about to drill out a jet to 120, to see what it did, when I started hearing that I probably had an air leak.

So before I go killing jets I might need, I figured I’d run it by you guys.

Does it sound like I have an air leak, even though I can’t find one?