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Hello all. New member with a question: Where can I find manuals for a 1989 Yamaha 350 Moto 4? Just traded for one and it runs fine but needs oil change, a cover and brake work. Also needs one head light. Thank you.

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      Hey guys, new here, but haven't found ANY answer to my specific problem on a Suzuki dedicated ATV forum, so here's to hoping!
      I acquired a 95' Quadrunner 250, 4x4, (LT4WD) for practically nothing with no spark. The PO had tossed in a used stator which didn't fix the problem... so I went all routes (though cheaply) to narrow down the initial problem of no spark. 
      Plug, coil, CDI (caltric) and stator w/pickup (caltric) were purchased and installed. And it RAN, but bogged horribly and would not rev past 1/4 throttle. 
      I checked fuel flow, vacuum lines, all the normal stuff, no issues. I decided to check the valves and cam... well, there was one problem. The cam was 1mm under the lowest spec in the manual. So, in-came a new cam, Stage 1 Hotcams... also threw in a new set of shindy valves, lapped them, replaced the valve seals, and the timing chain. 
      Back together again (w/stock airbox and new oiled filter). Now it idles even better, still boggs at 1/4 throttle, but will rev past it if you hold the throttle open for a second. Ahaha... success!
      So I was able to ride it above 1/4 throttle once I had momentum... could shift through the gears, all was good as long as I kept it over 1/2 throttle. Took a long enough ride to break in the cam properly at least so I won't have to worry about that. 
      Now, I start fiddling with the carb. It's clean as a whistle, stock, with stock jets (new replacement Mikuni jets). Same problem. 
       
      I start thinking, maybe this is fuel related and the bike is having an issue transitioning from idle jet to main jet... so I LOWER the needle by raising the clip 1 spot. Now it revvs up in neutral with no bog, but it boggs about the same trying to ride it. So I move the needle down again with the clip on the top slot. Better, but still has a bit of bog at 1/4 throttle. 
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      So I feel like each little step brings me closer, but not perfect. I'm now wondering if this is still in-fact a carb tuning issue (I have some jets I can fiddle with and maybe lean-out the idle jet a little.) OR if the cheap-a** Caltric Stator/Pickup is what's causing these issues. 
       
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    • By w_r_e
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    • By Ed Zeppeli
      Hi all,

      I picked up this quad after the previous owner couldn't get it going.

      The issue is that I can't get it to fire at idle or at all.

      I've...

      - replaced plug. Decent blue spark. Also tested with spark tester inline.
      - rebuilt the carb. PO had already bypassed vacuum lines from petcock. There's fuel at the cylinder
      - Checked compression with new gauge. reads 190 psi
      - cleaned all contacts I could access.
      - am currently jumping with car battery. Solenoid jumpered.
      - checked cam timing at TDC and adjusted valve lash
      - put gas directly into cylinder to see if it will fire at least momentarily

      Motor turns over well. Plug gets wet. 

      Motor may fire once or twice but smokes through exhaust a bit as if it's trying to fire or combusting.

      This leads me to suspect timing. As mentioned I checked the flywheel mark versus cam marks. Perhaps someone has been in there before because I can't find a 'T' on the flywheel but there is a very visible paint mark which aligns with TDC position on piston. Possibly a slipped flywheel/woodruff?

      Is it possible that if it had seen previous repairs, that the timing could still be off? I'm reluctant to dig into the flywheel/stator area if there's something else I could have missed but all signs point me to that area. Would a bad CDI cause spark timing to be off?

      Anywhere else to diagnose incorrect spark timing?


      I've scoured these forums and elsewhere but I'm posting just in case there's something I've overlooked up until now.

      Thanks very much for reading!


      Warren
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    • By Scott Matthews
      Just picked up a 1989 Big Bear 350 for $250 CAD. Bike was running but lost crank and spark. They've installed a new coil, a couple relays, and installed a Ford starter solenoid in place of the original. Now it cranks but has no spark so they sold it to me. Does anyone have a wiring diagram for this bike so I can test some wiring. Also any ideas as to direction to head would be nice. Lots of things have been hacked together so I know it probably wont be to easy. The ignition switch was replaced with a toggle switch, I already mentioned the Ford solenoid which 1 of the small wires was not re-installed, and a diode or something was removed from the oil temp sensor wire. I'm sure I will find more so a diagram would be amazing.
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      By Guest Fox300exchic
      Here's a web site for those of you who might need a manual on your quad. Not all are listed but some are. Its pretty cheap too. You can download it.http://www.shopmanualdownloads.com/results.php?style=A.T.V.
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