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I have a 1999 Yamaha Big Bear 350 4X4 and I need to rebuild the carb. I have the dual-cable throttle model and I'm having a terrible time finding the correct kit for it. I'm not opposed to replacing it, but the only ones I'm seeing do not have the dual cable throttle system. Any help would be greatly appreciated.
Jay in WI
P.S. I can send pictures if necessary.
picked up this pos bike for $80 not running. took it home, cleaned the carb and bypassed the fuse- ran great (other than the rev limiter- those things are so stupid) Then one day out of the blue it starts flooding on cold startup and wont idle cold, but idles to fast warm. (too fast being about half throttle speed heh). I tried a new carb ($10) and new sp. new carb wouldnt make it run except on choke and then it was gushing white smoke. I had better things to do with my time so I parked it in a shed and used it for a work bench for a while... this last weekend, I wanted to take it along with the sportman to a mens retreat to let the younger boys have some fun on it-- took about 30mins to pull all the crap I had accumulated on it and then rolled it down to my workshop, put the old carb back on after adjusting the needle clip up two notches (leaner) and threw it back on the bike. Will turn over, but no fire. I didnt have time to check sp that day but just wanted some incite on what could be wrong with this quad (if it even qualifies as being called that)
By Dra O
posted a while back - it was running at one point - I have all the plastic shroud off - it's down to frame and engine now
-fuel pump: when line from petcock is attached, no fuel comes out other side to carb; the line to the carb is open (can blow through it); I thought when I cranked engine that the pump would spit out fuel on other side but it does not; I removed fuel pump and opened it up - diaphragm looks good - but internal areas had lotsa calcification build up - I cleaned this out and dried it good - the clear plastic pieces (?diaphragms) aren't broken - the spring w/ steel ball on end moves freely; am putting it back on tomorrow; but can anyone answer about the pump? isn't it supposed to pump fuel through it... to other side... to carb? puzzling
-along with fuel pump: I replaced petcock 3 weeks ago (gas tank had rusty fuel in bottom - cleaned it out prior to new petcock); when I turn petcock arrow NOT to on or reserve, fuel comes out of line; when I turn it to on or reserve, fuel doesn't come out; puzzling
-I don't know what's on back of fuel pump - it's a valve that has a hose coming out of it - looks like it goes to engine/carb - I haven't traced this out yet - what is it?
-can squirt gas on air filter and engine will run for 2-3 seconds then stop - fuel in top of carb (under diaphragm) does same
-it likely needs carb rebuild - will get to this - but something isn't allowing fuel to get from fuel pump to carb
-I THINK it has a mikuni model x carb - diaphragm is ID 26mm OD 68mm - hard to find inexpensive diaphragm, I guess because it's a model x
-last thing - I replaced solenoid due to old one clicking; I HAVE to be charging the battery or it won't start/turn over - battery just goes dead; but if charging, it'll turn over nicely; i'm guessing it's a bad battery
-any help appreciated - I've never owned an ATV before - inherited this beast from grandparent in-law
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I had a quad fall in my lap a couple weeks ago. The only things I knew about it was it was a Kawasaki Bayou 220, was in pretty rough shape and was free. I couldn't say no to a fun little project. I've been looking a different ATV forums gathering quite a bit of info and decided this was the one I wanted to join.
Thanks to this forum, I found the VIN under about an inch of mud and cross referenced it to be a '98. It had been sitting outside for at least 5 years and was told it ran when parked, but had no brakes. Squirrels or mice had been chewing on the handlebar controls and it's generally just kind of beat up.
So far, I've gone through the carb (not near as bad as I expected), freed up the brakes (will probably need new cables), replaced the spark plug, air filter, petcock and put a new battery in it.
The gas tank had been empty and looked clean so I put some fresh gas in it and tried to crank it today. I got a neutral light, but the starter button did nothing. I tried pull-starting it and it wouldn't fire. I checked the plug and wasn't getting a spark. I started digging and found some potential issues and some definite problems.
I have a wiring diagram I found on here but it's just a picture or scan out of a book and hard to read. I don't see a reference to a black/yellow wire, which is my first problem.
First, it that a factory crimp? One of those wired looks like it goes to the connector in the 2nd pic. Is that just a spade lug type connector? I pulled on it with some needle nose pliers but it didn't seem to want to come off. In the 3rd pic, should there be a fourth wire?
I've read through and bookmarked the threads Andrew Baker and Arizona have going but I figured I needed to start with these obvious issues first. I have lots of pictures, so if there is something else you want to see, just ask. If I don't already have a pic, I'll take one.
By Mike Strayhorn
last year I bought led lights when I was riding my 4 wheeler the lights started getting dim shut off
now my 4 wheeler will not start the battery is hot everything is dead I checked the fuse and its good
would there be another fuse I am missing I'm took the led bulbs out and replaced them with the ones that was in there
wonder what meh problem is
By Grant Fellowes
Hi guys New to the forum. i ended up here google searching for info on a bayou 300 i have here which has a nice squeek to it. looks very much like its not getting oil fed to the head.
it was one of 2 bayous i got hold of to add to a third one i already had here. it looks like the previous owner had diesel in the sump instead of oil. its had fresh oil /filter in it but develops a squeek once it warms up. ive managed to work out the oil feed to the head is not getting anything so if anyone has a circuit diagram not just the parts manifest that would help out as im still looking for a service manual to download.
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