Have a carb/vac (?) problem i'm trying to figure out. Gas was overflowing out the airbox. Rebuilt the carbs. I went to drain the engine oil today, figure it was contaminated w/ gas. about 7 quart of gas came out of the engine. Now is there anything i need to do before I try starting it again besides drain throughly and add back the oil? thanks. I plugged the vac line and going to run it in prime to rule out the petcock vac diaphram leak issue.
You have a float needle that is not seating correctly.
Might be a stuck float, worn needle or seat, junk between the needle or seat, bent needle tang, or a few other lesser possibilities.
After fixing your carb problem:
Make sure you get all the gas out of the engine. Dispose of the gas and contaminated oil, then refill. Remove the spark plugs and crank it until the oil light goes out, then keep cranking for another 10-15 seconds once the oil light goes out. This will pre-oil the bottom end again.
Reinstall the plugs and start it up.
GeeP thanks for the advice. The carb is rebuilt already, cleaned and jetted while I was at it. when I put it back together and cranked it, gas still poured out and at much greater rates. When I tried to drain the carbs and put it back together, the bowls were 100% dry, that's when I figure it also could be a vacuum issue. Thanks for the tip about cranking w/out the plugs to pre-oil the thing. hopefully, the vac petcock leak is it, and it did a 1/2 decent job at the carb rebuild.
Ahh... Dry float bowls you say? Well, that takes care of needles then!
Are you certain you're reinstalling the hoses correctly?
Kerry made a fuel hose routing diagram, it is in the FAQ as I recall.
Beyond that, I suppose it could be the petcock leaking back into the vacuum line. I don't have one of the evil things, so I can't comment intelligently. :)
put everything back together today w/ no vac line. now I'm seeing fuel in the bowls. it's about 3 mm above the bowl housing using the clear tube method. is this too high? I really don't look forward to taking the carbs off again. is it possible to adjust the height w/ the carbs still on the bike? thanks
Quote from: flyingmachine on November 23, 2008, 03:37:33 PM
is this too high? I really don't look forward to taking the carbs off again. is it possible to adjust the height w/ the carbs still on the bike? thanks
3mm is a little too high. You can adjust the floats with the carbs still on the bike.
Drain the bowls (or just one at a time, but fuel will drip from the T between the carbs). Remove the bowl and tweak the tang with a small screwdriver or fingernail. Reattach, refill, recheck. Rinse, repeat.
thanks, adjusted the floats a bit. Bike started up on 1st cranks, and I had a quick ride around the neighborhood. Everything felt great, seems like the idle is dropping constantly even w/ adjustment. The gas level in the tank is a bit low, so I'll check again after filling her up. Thanks for the help y'all.
may i ask, when you say idle dropping constantly, can you clarify? liek, happens after what, or before what or, how far it drops, basically describe the idle issue plz. i went through countless gs crbs in the 4 gs's ive had, and had that issue twice. which i solved twice ( mmi training ftw eh? lol) also is power delivery good? any hesitation? etc. i await your reply. and btw on carb issues the buddha is the one tyo go to. even if he types like a crackhead lol
Actually I bought the jets and got some helpful advice from the buddha during the rebuild. The power delivery was excellent, the slight hesitation i had < 3000 rpm is now all gone. The idle issue occur after sitting on neutral for about 20 seconds, then it would drop from 12-1200 rpms or so down to where it stalls the engine. Not sure if this have anything to do with it, but I removed the vacuum from the petcock and pluged both ends (was getting massing flooding w/ no gas to the carbs) now I'll have to look for a fuel on/off only gravity feed setup. Could someone tell me which tank output is the normal and which is the reserve?
I was thinking about getting something like this: http://www.heeters.com/fuel.shtml 4th one down, and manually turn it on/off before after rides.