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Old January 19th, 2019, 08:39 AM   #28
jkv45
Rev Limiter
 
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Name: Jay
Location: WI
Join Date: Jul 2013

Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes

Posts: A lot.
MOTM - Jun '18, Oct '16
Quote:
Originally Posted by mistified View Post
UPDATE: https://streamable.com/gmwv4

I finally got the carbs out, took it a part and it was clean. BUT, the idle mixture screws were ridiculously backed out, something like 5 or 6 turns. I reset them to 2.5 turns out.
Does this mean at idle I was running very rich, thus the occasional bog at idle?

I also replaced the main jets, pilot jets, and shimmed the needle with this kit:

https://www.ebay.com/itm/08-12-Kawas...72.m2749.l2649

(2 one size larger Pilot Jets (#40), a set of 2 two sizes large Main Jets (#102) and one needle shim for each carburetor)

The original jets were clean, I could see through the holes, but were a little darkened at the tips.

Exhaust was also changed to a slip-on leo vince

Looks like my lean spot at 2k rpm is almost gone and idles nicely; took it out tonight and it performed flawlessly. I still get quite a bit of pop, and backfire flames when I abruptly close the throttle. Normal or should I back out the idle mixture screws again to 3 turns.
It's gonna be plenty rich with 40 Pilots and 102 Mains most likely. What do you have for air filters?

With the 40 Pilot jets you would want to be farther IN than the normal 2.5 turns out.

Think in terms of throttle position (1/8, 1/4, 1/2, etc) in addition to RPMs when diagnosing carbs issues. The position of the throttle is more important than the RPMs.

Something still isn't right, you shouldn't get any flames out of the exhaust at any time. I'd say you need to check the valve adjustment and everything else related to valve timing. An exhaust valve may be hanging open - or something like that.

What do the plugs look like?
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