carb drilling.

[Gyrogearloose]

well, here goes; it's 0500 hrs. and I can't sleep anyway. OK, I did the carbs on Ugly Betty (79 SF,.. wish I knew how to post my personal sh-t), and during that time, carb #3's bowl..somekinda vent, was plugged. I messed and screwed with it, squirting liquid stuff (not WD40) in the hole, and I just couldn't get it to open up. I cut off a wire from my wire brush and used that to try and open the hole..no luck. I used tip cleaners from my torch set-up, and, still no luck. Huh. Thought about heat (probably should'a), and finally drilled it. Hey! that worked! Yah, now #3's plug is black, and it misses at low to mid range (below 3500 rpms). Goes like a bat after that. But....now what? Would Yamabond (eluded to in others' threads) work to fill the hole again? If I prepositioned the right diameter "something" in the hole first?...would that ...make it all better? What is that diameter? Ha. Would somekinda' (Idle Mixture Screw, or float adjustment) tweakin' help here? I'm assuming that black plug that I can't make dissappear is the result of my drilling the bowl. Can the Carb Guru's help me here? Thanks ..again.

[John]

Was the offending 'jet' located in the edge of the bowl itself? If it is, then that is the Starter Jet. It supplies the fuel to the choke circuit. It is a very small orifice, intended to meter the fuel for the choke. If you drilled it, then you have basically ruined that circuit, and that is allowing too much fuel to be drawn through when the choke is applied, therefor flooding the cylinder with gas, hence the wet spark plug. You will need to replace the entire bowl, as the jet is pressed into place.

[81xsproject]

Yeah, we need to know which, hole you drilled out. What I have done in the past with VERY nasty clogs like that, is very carefully fill up the hole the clog is in with soak type carb cleaner (such as B-12 Chem-dip) and let is soak. I check it and change out the fluid daily until it can be broken up with the tip cleaners.

[GNEPIG]

Quote:
"If you drilled it, then you have basically ruined that circuit, and that is allowing too much fuel to be drawn through when the choke is applied, therefor flooding the cylinder with gas, hence the wet spark plug. You will need to replace the entire bowl, as the jet is pressed into place."


Or just turn off the choke right after you get your bike started (don't warm your bike up with the choke on) and hold the idle up with your throttle until it idles good enough on it's own. It's usualy idling good after about 3 miles.

I made that mistake with the carbs that I'm currently using, just couldn't get the holes unplugged and had to drill.
Been riding this bike like this for 2 years.

[Gyrogearloose]

Oh, so if I don't use the choke (starter circuit), then it shouldn't affect the rest of the carbs performance? That's good news, since the black plug, then, is the result of something else amiss....like the float level. Hmmm. It only runs rough at rpms below 3500. It goes great when I get on it. ...? would the Idle Mixture screw have anything to do with that missing? I did the "cover the first hole halfway" bench sync method, and rechecked it by sliding a strip of paper under each vacuum piston (?)...slight drag each. Whadda' ya think?

[prometheus578]

"GyroGear... why don't you just shut yer hole for once!"

Actually, what I'd do...
Clean the bowl real nice and such...
Mix up some JBWeld and plug that orifice in the bottom.
You'll then have a starting circuit on the other three carbs, enough to do the job, and no more fouled plug on carb #3.

[Gyrogearloose]

Thanks Prom, I guess it was JBweld that I was thinking of, not Yamabond; good suggestion too, I hadn't considered that.

[boyat68]

Also you could wedge a wooden dowel in the hole so that you could unwedge the hole if need be in the future.

[prometheus578]

The hole is destroyed, Boyat...
Those little jets are pressed in there. It's shot, now.
Would need a new bowl to make it right.

[Gyrogearloose]

Ok, well I think I can run with it now. Thanks. The hole I drilled into is the one that the brass tube fits into....maybe I could mix up some of that JBweld stuff and plug the outlet that's at an angle down in the bottom of the bowl. ? If I knew the diameter of the orfice we're talking about, would that work? I mean a hole is a hole....er...