I've only started my bike a few times since the rebuild, but it seems to (backfire?) (pop?) a lot, when warming up on choke.
That, and choke doesnt seem to work properly. I have to hold throttle for a while (10 seconds?), before it holds idle high any more. Didnt used to do that.
ANy hints on either of these two issues?

A recap of what I did:

1. took carbs off, in unsuccessfu attempt to rejet. Couldnt split it open, so reassembled. my very first time.
2. I checked the spark plugs. Put em back. But I'm new at this. so may be I didnt put em back juuuuust right. They kinda feel like they screw on, but you just "shove em on", right?
3. Took out the drop-in K&N filter. Saw a dry spot. Put the special K&N oil on it, and put it back in.

I can just barely observe the slider moving, when I move the choke lever. So that seems... functional.
Hmm.. I might have hit the idle screw when messing with the carbs. But when the bike is warmed up... it seems to idle happily, so its not like I killed the idle setting or something... ?

Any other ideas?

Re-check how you have the end of the choke cable connected. Possibly you got the spring in the wrong place or end of cable not seated properly.

The spark plugs screw in - obviously. The caps just push on. Not sure what you meant by your comment on plugs but though I could rag on you a little for fun anyway.

You could have an air leak.  Make sure the carbs are all the way into the intake boots, and make sure the airbox boots are properly seated around the carb throats.  Easiest way to check the airbox boots is to take out the air filter and reach in and feel with your hands to get the rubber boot nicely seated.  Then make sure your clamps in the boots are snug.

Quote from: adidasguy on September 21, 2012, 10:51:58 PM
Re-check how you have the end of the choke cable connected. Possibly you got the spring in the wrong place or end of cable not seated properly.

Forgot to mention that I didnt ever actually disconnect the throttle and choke cables.

I've seen this happen when the intake valves are too tight.   (You will also see flames spit back though the carbs.<<BiggestClue)

huh.  thanks for the idea.  I didnt touch the valves, though.
also, by "this happen", are you referring to the popping, or the lack of idle change?
I'm guessing the popping, but thought I'd check

Quote from: Phil B on September 22, 2012, 12:15:28 PM
huh.  thanks for the idea.  I didnt touch the valves, though.
also, by "this happen", are you referring to the popping, or the lack of idle change?
I'm guessing the popping, but thought I'd check

The popping, the intake valve wasn't closing/sealing, when the mixture would light off in the cylinder, the flames would blow back into the carb.  It was an extreme case, but it was accompanied with a "POP"

here's an odd thing.
it was a very hot day today so the tank was warm when I got on for the first time today.

I started it without the choke accidentally.
and it started right up more or less.
right at 1100 rpm.

I grabbed the throttle too much and it stalled.
so I put on full choke and cranked it.
didn't want to start.!

so after only the one try on choke,
took choke off, cranked it... and it started right up. idled happily, so I let it run for 10 sec and them I was off.

no problems, no pops....

wth is going on?
I mean... I thought I didn't really DO anything, but its running better than ever, lol?
are the higher revs on choke separate from the slide on the carb?
is it possible I'm stuck on a little bit of choke, but the rev raiser is not kicking in at all?

I'm stuck at the last sentence........."revs raiser"?

FWIW, the choke lever actually doesn't starve the carbs of air - it's technically a fuel enrichment circuit. So it adds gasoline to aid starting up a cold motor.

Quote from: Big Rich on September 22, 2012, 09:12:02 PM
I'm stuck at the last sentence........."revs raiser"?

when you put choke on, the revs go high? It makes base idle be around 3-4k, instead of the usual 1.2k rpm?

Its something specific to actual idle, rather than "more fuel=higher rpms", because (prior to this), if had the throttle a little open, I could get the engine to be at 2k rpm, but then when I let go fully, the choke actually *raised* the revs to 3k, lol.

Well, with the choke on it adds ONLY gasoline, no air. Which is needed on a cold startup.

I don't know what to tell you about any of your other problems though.

Huh.

After 3 rides, and 30 miles on it....
it's now back to normal.  Full choke, no longer stalls it when cold, and the revs go up to the usual 4k within 4 seconds or so.

weiiiirrrddd



I just hope it stays that way.

"And he never messed with his carburetors EVER again.  The End."