skrapiron -FSO
Serious Thumper
Offline
Instant Human.... Just add coffee..
Posts: 1456
Pittsburgh, Pa
Gender:
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I feel SOOOO stupid....
Why has my bike started the 'honey I'm home' backfire and it wasn't doing it (as badly last summer)? Why has the pilot circuit leaned out, when nothing else has changed? Do I have a leak? A loose bolt? A stripped screw? A pack of M-80s in the muffler?
No. (Idiot) Its cold.
I tuned the bike when the air temps were in the high 80s and low 90s with some pretty good humidity. It was running great in those conditions. But lately, I've been riding in mid 30s to low 40s. Cold air is more dense than hot air. With my K&N cone, I'm sucking in ALOT of cold air. The change in air density has caused my bike to become a tick lean.
So what do I need to do? For starters, I re-tuned the a/f mixture screw. 3 1/8 turns out (2 1/2 turns out in the summer). That reduced the boom to a pop.
I also figured out that if I pull my choke out 1 notch before I shut down, it doesn't backfire at all.
Man, some engineer I turned out to be.....
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