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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
By Christy Miller
Need a wire diagram for
99 big bear 350 4x4 can anyone help I have no spark my roommate drove it ended up losing the battery and it grounded out a.wire in the middle of harness was burned to BEAR any suggestions ty
By Flipper Tiffany Roper Jones
hi guys I'm back again lol. Last year I bought a polaris 500 magnum had some issues we banged our heads together and Finally fixed the problem well im back. So it ran fine for a long while then just lost spark. So bought the same exact stator and pickup coil I bought b4 boom fired right up now the kicker runs for 7 sec then dies ok so hear we go with what I've tried
Gap in throttle good unplug black wire did it no go
Reflowted bowl just incase fuel stopped not and didn't fill up not it
Bought a new fuel pump stator pick up coil twice now
Bought cdi box nothing
But if you hold it half throttle when you start it runs for ever
So new spark plug new wire
Coil nothing ill take any ideas besides fuel even mention it
By John Victor
My father-in-law gave my boy a 1999 350 Big Bear. It's been sitting in a barn for a bunch of years. It runs great! My boy has been riding a couple weeks now and it has developed a squeal coming from the front end when you get off the gas at speed. No noise during acceleration. At first I thought brakes. I took it for a ride and I don't think it is the brakes. I feel it is the front prop shaft U-joints, front differential or one/both axles. I pulled the fill plug on the differential and I can't find anywhere how much gear oil should be in there. My gut says up to the fill opening. It doesn't have a manual. It's wet in there, just don't see any gear oil.
#1 Should I fill the differential with gear oil up to the fill opening?
#2 How do I check or know if the u-joints are bad? That looks like a "Big Bear" of a job if they don't need to be replaced.
#3 What else could it be? I don't think it is the front bearings. I jacked the front wheels off ground and no play in the right wheel. Very little play in the left wheel, looks like the lower control bushing is where that play is coming from. The rubber CV boots look original but all still intact. Wheels spin easily without any noise.
Thanks for any help!
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Little background on my ATV history...I'm 39, been riding since I was little kid, first ATV was a Honda ATC 70 3 wheeler back in the day "late 70's, early 80's, cant remember"...Had a pile of dirt bikes over the years, then got into quads when they first came out...Raced MX for years in my late teens & early 20's...Yamaha Banshee in open 2 stroke, and Honda 300ex when it first came out "and was the hottest 4 stroke going"...Got out of riding after that and haven't owned a quad since then "mid to late 90's"...Looking to get back into trail riding and maybe race some XC once I get back into riding shape again.
We "me, wife & kids" are getting ready to buy a Polaris Ranger Crew Cab so we have room to put around with the kids and I hunt a lot and will use it for that...But I want something fast to ride again, I'm not a utility quad kinda guy when it comes to trail riding, they are to slow and heavy for my taste...So now I'm looking for a good used race/sport quad, really want to stay with a 450...
So between the YFZ 450, TRX 450, LTR 450 & KFX 450 which one should I really consider??? I was always a Yamaha and then Honda guy. Looking for something in the 2006-2009 model range. I've been hitting the local shops up here in South Dakota "just moved here" and have found a few but not a lot, not much in the way of sport/race bikes in this area...Been looking a lot online but not finding a ton in the immediate area.
I'm just not up to date on the modern 4 stroke race bikes, I was always a 2 stroke guy back in the day and knew all about the Banshee, 250r & Quadracers back then but those are all ancient history now days.
well i had an unexspected thing pop up with enrolling my son into school he will be starting Pre-K the end of summer and with us having 1 vehicle and the school saying he cant ride the bus with his sister it brought up an issue that needed to be adressed not to mention he will only be going half day so the wife made me sell off all my wheelers to get a 2nd vehicle lol it was heart breaking yes buttttttt
me trying to think of anyway possible to be out on the trails having fun
i devised a plan and got another toy so to say
ended up buying an 87' sazuki samarai 4x4 its a lot like riding in a side by side lol fits down the trails just the same as any 4x4 utility atv does and will go anywhere and to top it off its street legal and will get the kid to school and he can ride passenger on this lmaoo so im not toally out of the game
and here is a pic of me testing it out lol its all stock at the moment but im changing that asap
doing a spring over lift thats gonna bring it up 4 1/2 inches then put some 31' mudders on it and a winch and plenty more mods
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