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Found 3 results

  1. Hello out there, I recently picked-up a 2005 Yamaha Bruin 250 for the wife. When I went to check it out, it started on first pull, idled nicely, drove it around, essentially no problem. The previous owner had recently put in a new Chinese made carb, and all seemed well. I got the Bruin home, unloaded it, and fired it up. Started to drive it around and noted that it would idle fine, but would bog and whitish smoke would come out of the exhaust when throttle was applied. Did some research online and there was talk of possibly a stuck or bad ring, bad oil, or leaking head gasket. Recommendations were to first change out the oil before proceeding further. I changed out the oil and put in 10W-40 synthetic with 20% Marvel Mystery oil ( was recommended on a couple of sites, but not sure if this was the best idea). The old oil in the machine was thick and black, obviously not having been changed in a long time. I also put is a new plug. After starting up the machine, it idles fine with no smoke. I can even drive it around in first gear at low RPMs with no smoke or bogging. If I increase to about 1/2 throttle or shift into second gear, it starts to smoke (whitish), bogs and dies. I've check the plug, and there appears to be black oil residue on it. I am not sure where to start, as I am not sure if it is one issue or a combination. I've seen four strokes drive around burning oil and not bogging. There appears to be some correlation between the bogging and the smoking. I am not sure where to go with this next. Do I swap out the oil with the Marvel Mystery oil in it for pure synthetic? Do I try putting in 20W-50 to see if this resolves the issue? I half question if the reason that the ATV drove fine when I tested it was that the old oil was so thick and dirty that it could not leak past the rings. Or am I looking at performing a top end rebuild with new gaskets and rings? Total frustration here with a new machine to me. Any thoughts would be appreciated. Thanks.
  2. About a year ago I replaced the carb on an Bruin that I bought from a relative, I replaced it because it was gummed up from bad gas sitting in it for a couple years. Replaced the carb, and ran it a little bit and it had a problem of the carb popping whenever giving it throttle. I assumed this was just a fuel air mixture I needed to adjust, but I was lazy and just let it sit for a few more months. I went to adjust it just now, but I don't know if I'm slightly retarded, but I can't find the fuel/air mixture adjustment screw anywhere on the damn thing. I've tried nearly every screw I could find on it without taking the whole thing off (Which is a pain on this atv). I'll link some pictures I have from ebay on this carb. I also checked manuals and diagrams of the carb and could not find anything anywhere. Please spare me from my complete ignorance.
  3. Hello all, I registered on this site because I just purchased a new to me 2005 Yamaha Bruin 250 2wd. This seems to be the only place to get diagrams so I'm hoping I can download them sooner or later. The guy I bought it from said it had no spark. And it truly does not have spark...lol I haven't looked into much on it. Looks like he replaced the ignition switch and the stator. I'm thinking CDI box but I want to check the coil first. I look forward to helping others out on the electrical end of the world. I am an ASE certified automotive electrical technician. If it's 12v, I can usually figure it out.
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