The Big Bear's engine was fed a by a single carburetor. Thanks for the help. Yes, fixed starter and starter driveand carburetor leaked at bottom of fuel bowl overflow tube. Most Improperly purging the exhaust system. Hi, I have a 2003 yamaha big bear 400. I have been having trouble with the carb. how do you adjust Carburetor on a polaris predator 500. I know the air screw should be turned out 2 1/4 - 2 1/2 turns. Use the base manual for everything not contained in the supplement if your model or year requires a supplement. With the earlier versions as well as the later versions, 1997 and above, there are a handful of problems that riders can and may experience. I pulled the carb and its beat up just like his other bike I worked on for him (the bayou 220). Page 129: Carburetor Adjustment The carburetor is a vital part of the engine and POTENTIAL HAZARD requires very sophisticated adjustment. It could be a car, motorcycle, scooter, ATV, or anything else with a carburetor. I'm working on a 1988 Big Bear 350 4X4 for a friend of mine. The Web's most trusted source for 1998 Yamaha Big Bear 350 4WD (CA) YFM350FWBKC CARBURETOR OEM Parts. trussmanypb '02 big bear 4x4 The bear's running like crap, very rich, fouling plugs. A Big Bear 350 is an all-terrain vehicle first introduced in 1987 by Yamaha. This will take some time to get it right but it needs to be done! who has the professional knowledge and ex- WHAT CAN HAPPEN perience to do so. Adjust the string by moving the Jack Stands in or out untill the string just touches both of the side surfaces of the rear tires on each side of the ATV. 1998 Yamaha Big Bear 350 4WD (CA) YFM350FWBKC CARBURETOR Parts at BikeBandit.com. Dear valued customer, due to extended delays with OEM suppliers and the ongoing COVID-19 crisis, most parts are being placed on backorder status. Always make air fuel mixture screw adjustments with a warm engine and the engine running, so you can listen to how the adjustments affect the engines idle speed. LKV YFM350 Carburetor Carb Replacement for ATV Yamaha 350 YFM350 Moto-4 1987-1990 & 1992-1995 BIG BEAR 4WD 1987-1996 BIG BEAR 2WD 1996-1998 WARRIOR 1987-2004 WOLVERINE 1995 KODIAK 400 YFM400 4WD 4.4 out of 5 stars 38 This fact prompted Yamaha to produce its first camouflaged ATV in 2000 with the Buckmaster Edition Big Bear. What about the other screw? I cleaned everything up, installed the carb, and it ran, but crappy, and would leak out the overflow tube on the bowl. got a big bear Im working on for a guy and it was flooding gas out into the air box, but still running. Which of the 2 screws on the carb is the air screw.What is the other? In most cases, these issues can be fixed by making a few adjustments Here is a picture gallery about yamaha big bear parts diagram complete with the Throughly cleaned carb adj valves pipe is glowing red backfires and misses ran the pilot jet out 1 1/2 what do i do please help i need it in a bad way tightend the boot on the carb engine side even put a new clamp on cant tell if its missing or backfireing through the carb does backfire through tail pipe was backfireing through carb for shure before i messed with the intake boot Some models may need supplemental manuals which have blue titles. The Yamaha Big Bear debuted in 1996 as a 400 cc utility-type all-terrain vehicle that quickly became popular among game hunters. We need help with a Polaris scrambler 500, 1998, Yes, fixed. Page 111 This service manuals covers the 1987-1999 Yamaha Big Bear 350 4x4 series. Note that this process is the same for any type of engine with an air fuel mixture screw. When I opened it up to clean, there was a substance that looked like jelly in it. it has a plunger and a butterfly. It hadn't been run for a long tiI Ime, and one thing was to clean the carb. Its a weird carb tho: the throttle comes in at two locations. Anybody out there good at screwing? Description: Carb Adjustment For Hmf Yamaha Grizzly Atv Forum with Yamaha Big Bear Parts Diagram, image size X px, and to view image details please click the image.. adjusting should be left to a Yamaha dealer Hot exhaust system.