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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.
Looking for Yamaha ATV VIN (Vehicle Identification Number) Number Decoders? Once you find your ATV VIN number off the tag on your Yamaha ATV, you can go to all kinds of websites that have VIN Decoders available. The best ones are backed by the Yamaha ATV manufacturer, however there are plenty of aftermarket Yamaha ATV VIN Decoder websites on the web. This topic will stay pinned and if you find any to add, please do it with a reply.
The following Yamaha ATV VIN Decoder websites are available where you can just enter your VIN number and it will shows you some of your ATV model details:
NICB Theft Check https://www.nicb.org/theft_and_fraud_awareness/vincheck
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