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I picked up my first ever ATV on friday. It's an 89 Big Bear. It has some cosmetic issues, but seems pretty decent mechanically. I did have trouble getting the idle tuned to the book spec of 1,300 - 1,500 RPM. I took the carb apart and cleaned it out. Somebody must have lost the spring for the pilot screw, as it's no longer in the carb. Also, I have a dual cable carb, I noticed all the IPL's show the single cable carb, but I see others on youtube had dual cable carbs. When I would adjust my idle speed screw, nothing would happen. I bottomed it out and it didn't seem to make much if any difference. When i pulled the carb apart I saw the screw doesn't even touch the linkage, it's too short. Do the two different versions have different length carb screws? I'm wondering if somebody lost the ordinal, replaced it with the IPL number for a single cable carb which is shorter, and gave up on getting the ATV to idle. If you hold the throttle just a bit to get it to the RPM range listed above, it "idles" great. Any ideas? Or any links to the dual cable IPL?
Have you guys have good luck with the aftermarket intake boots? Or is this a buy once, cry once deal? I'm guessing the OEM units last longer, but there is a huge price difference. If you have had good luck with aftermarket, where did you get it? My current boot doesn't seem to have any air leaks, but it's encased in JB weld...
I'm getting a 9th digit check sum error on the ATV when I put the VIN in. Has anybody seen this before on a Yamaha? The VIN number looks original as well as the paint around it.
A friend of mine has this Bayou 220 that started running bad and parked it a few years ago. I foolishly volunteered to take a look at it. I noticed right away the choke plunger on the carb was broken and probably the reason it was running bad but now the old gas was evaporated and like turpentine. Before i even tried to start it, i drained/ thoroughly washed the tank out, new fuel filter, new fuel lines. Blew air through the petcock etc. Changed the oil and filter and air filter and new choke plunger and cable. I disassembled the carb and rebuilt it with a kit. I cleaned the main jet with solvent and poked a wire through it to make sure it is clean.. the engine now fires right up with the choke on and dies when i take the choke off. I adjusted the air/fuel screw to about 1.5 turns out and the idle screw about 2.5 turns out. The rubber boot between the carb and head does not have any cracks in it so I don't think it is leaking air. I originally had the clip on the needle on the second from the top ring... when i moved it all the way to the bottom it starts, runs and idles really fast and will idle eeally high with the choke off but if i adjust the throttle cable and/or idle screw to a slower idle it will sometimes stall but the idle will go up and down every few seconds and when you give it gas there is a hesitation... i tried moving the clip down to rhe second from bottom and same problem... i replaced all the parts in the pic to the top right. However, there appears to be a small o ring, washer and spring left over from the kit... i did not see these get removed..... a) any idea if where these extra parts go and if i need them and b) any other ideas on why i cant get it to idle right or carb adjustment ideas?
Ok got a quad if a mate that's helped me out a few times said I look at it for him
Been sat for 6 years in a barn checked spark and also changed the spark plug after a sonic clean of the carb started and started easy but when you use the throttle it bogs and near dies
Now this unit has 2 tanks one for oil and one for fuel for the moment I'm bypassing the 2 tanks and using only a fuel mix direct in to the carb could this be causing the problem ?
I've done a second clean and refitted and still the same even as the air screw was near fully in it was said from watching a few vids that is was starving of fuel so I've increased the pin on the throttle up a notch but still no difference
There is not much adjustments on the carb so assume there's not much to go wrong but I was going to buy another carb but I can't find the right one here a pic of the actual carb
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