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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 Daniel Gibson
Working on a bayou 220 that has been ran extremely hard it's whole life. Literally had almost an inch thick dirt/oil covering the motor. Yeah that bad. Surprisingly it runs though. I cleaned the carb and tank multiple times. They're clean enough to eat off of. Readjusted valve lash and set timing. Was about 3 teeth off. It cranks good and runs good only problem is I have to cover the carb intake basically choking the hell out of it for it to start. The com choke works fine. It does this each time I start it regardless of temperature both ambient or motor. Wth? Compression is at 115psi I get 130s if I put a little oil in the piston chamber. Please help. Thanks
By Dwight Williams
Hey everyone, I've been scratching my head over this for most of the day. I bought a couple of Bayou 220's, got them running (they've both been sitting), and started tweaking and fixing small things. One of them is mostly done, the other had an aftermarket carb on it and I've been trying to sort that out.
Anyway, while adjusting the carb it died a few times, I restarted and moved on until it died and wouldn't restart. I figured maybe I'd flooded it or something - after further attempts I realized I had no spark. Since I have two identical machines I have many parts at my disposal. I've swapped the CDI, spark plug and coil with no luck. I have good resistance readings from the stator and pick up (135 and 110 respectively), I don't have a peak voltage meter but I measure around 53VAC on the stator when cranking. I have a 4 wire stator, not an alternator like the newer ones. Grounds look good, I've checked the kill switch by verifying that it and the ignition switch grounds the black/yellow wire to the CDI. I can turn the engine slowly and see the pickup short the meter as well, seems normal right? So far everything I've checked looks the same on both machines. I've got the service manual and wiring diagrams. Do these readings make any sense? I'm obviously missing something but I'm stumped. thanks!
By Dwight Williams
Ok, so I bought a 2006 bayou 250 for 200 bucks, kid couldn't start it and had no idea why it wouldn't run, I pulled the rope and felt what I thought was valve to piston contact, he wanted 500 and I talked him down to 200 and brought it home. Sure enough, timing was way far out, timing chain incredibly loose. So for fun I re-tensioned the timing chain and re timed it, got about 120lbs of compression, pretty low. I cannot get the chain very tight but the the tensioner seems to work fine, the chain guides don't look very worn. Also, when I took the head off the valves don't look bent and the piston has no discernible marks on it. Is this an interference engine? I sure thought I felt some contact with the pull rope but maybe no permanent damage was done? Anyway, I plan on doing a full top end job as well as timing chain tensioners and hopefully that'll cure it. Is there any reason other than chain stretch (I measured it and it's ok) or guide wear that would cause the chain to be so loose? Thanks!
By Mike Johnson
Does anyone know what the 3rd item is behind the battery on this ATV ? I know 1 is the, solenoid1 is the CDI box, what is the 3rd.
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By Anthony Marceau
Hi everyone! I have a 1986 yamaha moto4 200 that's been sitting for a while! Cleaned the carb, replaced engine oil, put fresh gas in it. Got it running and went for a ride! It was running great just a little backfire once in a while! I barely made it home on the way back and now the bike won't run at all since then! It will start if I give a little bit of throttle but dies instantly as soon as I let go off the throttle! And even if I try to rev it up it'll sound like its not getting enough gas.. it revs up a couple hundred rpm's and backfires through the carb.. it almost sounds as if I was trying to take off from zero in 5th gear! Nothing is seized though! I dissasembled the head and the piston and cylinder are fine! Rebuilt the carb, replaced the ignition source coil.. I don't know what to do anymore.. compression test shows 90 psi Specs are 128 psi but i'm not sure if I trust my compression tester.. any ideas? Thanks!!
Hi! I'm new here, and I'm striving hard to learn about doing my own quad repairs. That's how I stumbled on this forum, and I wanted to introduce myself.
I wrote a little article about my travails with wrenching on my website, Raventurous - My Life Outside My Comfort Zone (specifically, Mechanics Make Quad Repair Look Easy). I'd really love for you to check it out ant tell me what you think. I've been riding quads for about five years and have been working on my own repairs for nearly that long.
Thanks for checking out this post! I’ll hope to get to know people soon.
Long story short. I bought this off my neighbor and only has 3 gears. The part that holds the shifter rod on broke, this is on the inside where the clutch is. The rod moved out of its spot and when they welded it back together only has 3 gears. I have a new case for it just need to know how to get the shifter in the right spot before I put it back together. I am missing the indicator that shows me where neutral is. A link to a good Manuel would be great. Thanks
Hey all, I just want to start by saying I am brand spanking new to the wide world of ATV's. I had one as a kid, then didnt step foot on one again till yesterday. And that brings me to this site. I just got a used Timberwolf 2wd of Craigslist. I am a very excited new quad owner. Its not perfect, it smokes and if you dont stay on the gas it turnes off most of the time. Also there is no battery atm so I am using the pull start. So heres my deal. I got it right around sun down. Rode it around for about 10 minutes, bought it. Rode it around again for another maybe 20 minutes as the sun was fully set. (It needs a battery before the lights will work I am told). So I park it. Next morning. I go outside, pull the choke. And she fires right up. Rode her around for about 30 - 45 minutes. I got home from that ride and was going to go park it. I down shifted into neutral so as to put it in reverse, and before I could get it in gear it died. And I hanvt been able to get it started again. Choke in choke out nothing. I have a couple ideas, let me know what you all think.
1. Clean the very very filthy air filter, not sure though it would make it die and not start.
2. Clean the carb. I am very confused though because it worked and worked then all the sudden nothing.
3. Get a battery. I am hoping that in getting a battery it will work with the electronic start.
4.Change the gas. The gas that came with it is discolored and looks old. Still, it got me 10 miles at least no problem.
I kinda think maybe the fact that it cant hold an idle withoout being on the gas may have something to do with why it now wont start.
Other than that, all I can think is to take it to a shop. But I am a broke ass so I really dont want to have to do that. Any questions or suggestions would be great.
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