Basically, i picked up a cheap 90 katana (gsx-600), was sitting for several years (had a 94 inspection sticker on it), needed a clutch, replaced it, drove great for about 3 days. Then ofcourse the carbs fouled out from all the old varnish. Had a guy clean them, and was suppose to sync (he didnt), but now it's running way too rich, he said he thinks it's the jets??? but it ran fine before, could I have burned my jets out by putting too much additives in the tank (and a good amount of carb cleaner sprayed directly into at full throttle) to clean it myself (seafoam and small acetone mix....(about 5 percent) if you dont know about acetone in the tank, dont reply, it's safe in small amounts). Are there rubber seals and stuff associated with the jets, or are they just metal on metal??
2007-09-06 07:00:19 · 5 answers · asked by Eric 2 in Cars & Transportation ➔ Motorcycles
You didn't state which RPM range (throttle opening) it's running rich at, or across the entire range, but here's a few ideas:
Running rich at idle, there is an idle mixture and idle speed screws. Some idle mixture screws richen when turned out, other lean out, so you'll have to experiment. Usually set for highest idle speed.
Off idle to 1/2 throttle, basically jetting. Possibly, the guy that cleaned out your carbs used either a drill bit, or a welding tip cleaner to get the gummed up varnish out. Bad news either way, as one can easily enlarge the size of the jet this way.
1/2-3/4 throttle, there is a needle (on slide type carbs) that fit into the main jet. Everyone I ever seen had a series of grooves, and a clip that fit into the groove, to adjust the needle in the jet. Maybe the guy put the clip in the lowest groove, moving the needle all the way up, enrichening the mixture.
3/4-wide open, main jet, plain and simple.
2007-09-06 07:39:14 · answer #1 · answered by strech 7 · 0⤊ 1⤋
Did you consider a piece of old gasket material, or a chunk of some other gunk, in the needle valve seats for the floats? Possibly kicked loose during the rebuild, and not spotted during the re-assembling, or popped loose after the rebuild during a ride? You are just flooding the carbs if the needles don't seat completely. Maybe that's why the carbs do not seem to be in sync. (Or maybe just one.) Forget the jets. Look elsewhere.
Know about acetone, worked as a cabinet maker. Works on more than just stains and sprayers. Heard of Seafoam. Mostly good things if used on the problem it will help. Useless otherwise. And no, you can't burn out a jet unless you use a welding torch. (I've heard stranger things.) Never stick anything in a jet hole that is not softer than the jet material. You will ruin it.
And we didn't use acetone in the "old days", we used wood alcohol. A few ounces to the gallon size of the tank. The bigger the tank, the more wood alcohol per ounce, per gallon.
Look on the bright side. Rich is better than lean. For a while anyway. Until the excess fuel keeps the oil from properly lubricating the cylinder walls, and/or valve stems. Lean can kill a motor quick before you even know you have a problem.
Consider yourself lucky. And park the bike until you find the problem. Not sure what I'm trying to say? Drop me a line. I do e-mail and IM. Good luck. Ciao!
2007-09-06 18:34:09 · answer #2 · answered by rifleman01@verizon.net 4 · 1⤊ 1⤋
No they don't burn out.
A lot of "backyard" mechanics will use a peice of wire to clean out small holes(like your jets). It's one of the worst things you can do. The jets should be metal to metal, no seals. Acetone is safe in small amounts, but only small amounts, and not for a long time. Never tried Seafoam, probably not a good idea to mix. There is a possibility that your "mech" didn't do anything bad. If the bike had been tuned while the carb was dirty, it would have partially plugged holes. Over time, these would close up more. Then when it gets cleaned, it ALL comes out, leaving you out of adjustment, but in the other direction.
2007-09-06 17:25:24 · answer #3 · answered by Firecracker . 7 · 0⤊ 1⤋
no you cannot burn the jets out. They are usually made out of brass or other metals. But they can get clogged if not regularly cleaned....
I would recommend against acetone, and use carb cleaner.....
2007-09-06 14:09:14 · answer #4 · answered by SWT 6 · 0⤊ 1⤋
Sounds like the guy that cleaned your carbs might have accidently jetted them a little bit. It's pretty easy to do by running a pipe cleaner through them since they are brass. Probably need to get new jets though. Another thing you might try is getting more air by removing the air box and replacing it with a high flow filter, that will even out the excess fuel and get you bettter hp.
2007-09-06 14:28:15 · answer #5 · answered by This Guy 4 · 0⤊ 4⤋