max power Posted August 24, 2009 Report Share Posted August 24, 2009 I am trying to figure out a problem that has recently occurred with my quad.It will only run with the choke full on. I if I shut the choke off, it dies. If I touch the gas, it dies. I removed the carb from the engine and gave it a thorough cleaning with some carb cleaner. Reinstalled it and fired it up. It now runs with the choke on (although it doesnt idle well) and will rev, but if I shut the choke off, it dies. It will also run with half choke, which is an improvement, but also doesnt idle well. I cant find any cracks in the boot, so I am somewhat stumped.Just to eliminate the possibility of it not getting enough gas, I bypassed the original fuel line and filter with a straight gas line I had laying around.any ideas? Quote Link to comment Share on other sites More sharing options...
DTM Brian Posted August 24, 2009 Report Share Posted August 24, 2009 Might want to pull it off and clean it with some carb cleaner. I have had old bikes do that very same thing. Quote Link to comment Share on other sites More sharing options...
max power Posted August 24, 2009 Author Report Share Posted August 24, 2009 I removed the carb from the engine and gave it a thorough cleaning with some carb cleaner. Reinstalled it and fired it up. Might want to pull it off and clean it with some carb cleaner. I have had old bikes do that very same thing. I did. Quote Link to comment Share on other sites More sharing options...
DTM Brian Posted August 24, 2009 Report Share Posted August 24, 2009 LOL.I guess I should do a better job of reading the entire thread. Quote Link to comment Share on other sites More sharing options...
Wheezle Posted August 24, 2009 Report Share Posted August 24, 2009 Vacuum leak or clogged jet Quote Link to comment Share on other sites More sharing options...
max power Posted August 24, 2009 Author Report Share Posted August 24, 2009 Im leaning towards clooged jet, (even tho I cleaned the shit out of them) but the erratic revving at idle makes me think it could be vacuum. Problem is, I cant find any vacuum lines on the thing. its a 2001 Warrior 350. Quote Link to comment Share on other sites More sharing options...
Wheezle Posted August 24, 2009 Report Share Posted August 24, 2009 How long has it been sitting not being used?? Quote Link to comment Share on other sites More sharing options...
max power Posted August 24, 2009 Author Report Share Posted August 24, 2009 (edited) since it tried to kill me on May 16.It gave me some trouble that day also. barely idled for a while all of a sudden as I was trying to climb a hill. Every time I tried to give it gas, it tried to die. I had to chug slowly down the road at just above idle for a while and it cleared itself up and ran great for the rest of the day. Edited August 24, 2009 by max power Quote Link to comment Share on other sites More sharing options...
ReconRat Posted August 24, 2009 Report Share Posted August 24, 2009 (edited) One carb down out of four will make it bog down. Barely run. It's lean. Fuel isn't getting to one or all carbs. The problem is in there somewhere. About half the time I have to clean a carb twice to get the problem out. So I just clean them twice in the first place and save some time. If it's not idling, it does sound like either an air leak or an idle jet. The problem is, with that type of problem the bike should still run when throttle is applied. I think I'd look for a slide or needle or diaphragm that isn't moving, or isn't positioned correctly. These are CV? Look for an air leak around the top of the throttle slide diaphragm cover, or the vacuum lines. You probably have the correct carb isolated, if it's starting to respond to attempts to correct.You ever find the "won't run when wet problem"?edit: oops, thought you meant the Vmax... Edited August 24, 2009 by ReconRat oops Quote Link to comment Share on other sites More sharing options...
Wheezle Posted August 24, 2009 Report Share Posted August 24, 2009 Oh man, that screams rebuild kit for the first thing. Then new jets and possibly floats as well. Sounds as if the carbs have formed laquer in them. I would even be willing to go and say the needles have become gunked up. I would reuild the carb and make sure to replace any gasket or O ring it has. I would also replace both jets and the needle. Quote Link to comment Share on other sites More sharing options...
max power Posted August 24, 2009 Author Report Share Posted August 24, 2009 You ever find the "won't run when wet problem"?Yeah, stinkin $30 part. Diode assembly. It had a rubber cover that got loose. water got in it and stayed. I disposed of the rubber cover and plasti-dipped it. works great now. Quote Link to comment Share on other sites More sharing options...
max power Posted August 24, 2009 Author Report Share Posted August 24, 2009 Oh man, that screams rebuild kit for the first thing. Then new jets and possibly floats as well. Sounds as if the carbs have formed laquer in them. I would even be willing to go and say the needles have become gunked up. I would reuild the carb and make sure to replace any gasket or O ring it has. I would also replace both jets and the needle.Had it open today when cleaning it and it seemed pretty clean inside. no lacquer to speak of. I guess it could need rebuilt, but would it happen overnight like that? It was starting and running fine up to a week ago. Quote Link to comment Share on other sites More sharing options...
Wheezle Posted August 24, 2009 Report Share Posted August 24, 2009 With out being run regularly yes it could need rebuilt. Also if you have just been idleing it, You may need plugs b/c excessive idle time can burn up plugs. Quote Link to comment Share on other sites More sharing options...
magifesq Posted August 24, 2009 Report Share Posted August 24, 2009 Any small crap in the carbs could do the same thing, I usually buy new jets since they're cheap Quote Link to comment Share on other sites More sharing options...
max power Posted August 24, 2009 Author Report Share Posted August 24, 2009 alright. I'll pick up new jets and a new plug tomorrow. maybe even get a rebuild kit if they have one in stock. Quote Link to comment Share on other sites More sharing options...
max power Posted August 25, 2009 Author Report Share Posted August 25, 2009 alright. found a clogged pilot jet. Drained the tank, cleaned the pilot and the main and reassembled. Fresh gas in tank.Started up, and it back fired like crazy. Still wont idle with the choke off because the back fires cause it to stall. Replaced the spark plug and it still back fires almost constantly. Any clues what could be causing the back firing?BTW, the rebuild kit was on back order. Quote Link to comment Share on other sites More sharing options...
Wheezle Posted August 25, 2009 Report Share Posted August 25, 2009 How were the floats? Were they free or sticking? Quote Link to comment Share on other sites More sharing options...
max power Posted August 25, 2009 Author Report Share Posted August 25, 2009 they are free and appear to be adjusted correctly. Quote Link to comment Share on other sites More sharing options...
John Posted August 25, 2009 Report Share Posted August 25, 2009 running only on choke = clogged pilot jets/circuit. IMO Quote Link to comment Share on other sites More sharing options...
max power Posted August 25, 2009 Author Report Share Posted August 25, 2009 The pilot was clogged. I cleaned it. Quote Link to comment Share on other sites More sharing options...
John Posted August 25, 2009 Report Share Posted August 25, 2009 oh, i see you already discovered that. sometimes pilots are down in a counterbore and ppl miss them the first time through did you measure the float level to make sure they are within spec? i would backflush the line through the float valve. do it over a piece of paper so you can see if anything comes out. maybe hook up a gas line to the carb with the bowl off, and manually operate the float to make sure that it is indeed stopping the fuel flow. sometimes the seat can get worn or whatever. if everything in the carb is fine, then id start looking at your spark. Quote Link to comment Share on other sites More sharing options...
max power Posted August 25, 2009 Author Report Share Posted August 25, 2009 maybe hook up a gas line to the carb with the bowl off, and manually operate the float to make sure that it is indeed stopping the fuel flow. sometimes the seat can get worn or whatever. if everything in the carb is fine, then id start looking at your spark.Good idea. I'll hook up the line and check the float. It seems to have good spark and I replaced the plug just in case. Quote Link to comment Share on other sites More sharing options...
Angrish Posted August 25, 2009 Report Share Posted August 25, 2009 I am trying to figure out a problem that has recently occurred with my quad.It will only run with the choke full on. I if I shut the choke off, it dies. If I touch the gas, it dies. I removed the carb from the engine and gave it a thorough cleaning with some carb cleaner. Reinstalled it and fired it up. It now runs with the choke on (although it doesnt idle well) and will rev, but if I shut the choke off, it dies. It will also run with half choke, which is an improvement, but also doesnt idle well. I cant find any cracks in the boot, so I am somewhat stumped.Just to eliminate the possibility of it not getting enough gas, I bypassed the original fuel line and filter with a straight gas line I had laying around.any ideas?pilot or main jet period. Take them out poke and clean, get the shit out of the fuel you should be ready to go.Or bring up to HNW and will fix it. Quote Link to comment Share on other sites More sharing options...
Angrish Posted August 25, 2009 Report Share Posted August 25, 2009 alright. found a clogged pilot jet. Drained the tank, cleaned the pilot and the main and reassembled. Fresh gas in tank.Started up, and it back fired like crazy. Still wont idle with the choke off because the back fires cause it to stall. Replaced the spark plug and it still back fires almost constantly. Any clues what could be causing the back firing?BTW, the rebuild kit was on back order.You have gas in the cylinder take out plug,turn off pet cock, turn over motor "disconnect coil" keep doing it till all the gas is out "it will go everywhere" check your valve lash and try thenPS sorry I didnt read the whole thread first.I'm in ashville you could always be it by just PM me Quote Link to comment Share on other sites More sharing options...
Jsvob03 Posted August 25, 2009 Report Share Posted August 25, 2009 the backfiring could be an exhaust leak. basically it pulls in air from the leak, and causes the unburnt fuel from combustion to burn in the pipes. and thats IF its leaking close to the head.it sounds like the idle circuit is either plugged, or improperly adjusted. Have you tried adjusting the idle screws? a good start is to lightly seat them, and then back them out to two turns or so (it just so happens 2.5 turns runs good on my ex500). then set your idle. You can feel out your proper a/f idle mix by adjusting one screw1/8 turn, then the other. if the idle goes up, its getting better. just make sure whatever you do to one screw, you duplicate to the other. I have no idea how many (if more than one) carbs your bike has. im assuming two..but i dont know. Quote Link to comment Share on other sites More sharing options...
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