got it runnin! 91 trailboss
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By Callaway
I am trying to diagnose a no spark issue with my 02 Big Bear 400 and I am really hoping it is not a CDI. I have done the test on the stator and I believe that is faulty. I ordered a new aftermarket one from a the jungle website and it tested bad right out of the box so I am waiting for a different one to arrive from an ATV parts supplier. I started looking out of curiosity at CDI units and it seems if it is for a big bear you are SOL. Kodiaks, no problem. Big Bear. No such luck.
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By BillR94
I picked up this ATV that had no spark. The previous owner said he was driving it and it died and would not start. He discovered it had no spark. He replaced the CDI and the coil with no luck. He got tired of it and I bought it. I replaced the stater and now it has strong spark. Now, it starts for a second or two then dies. It will not stay running. I have checked the timing and it is spot on. The valves are adjusted correctly. I see no warn issues with the cam. I put the original CDI and coil back on it. Same problem exists. Compression is at 65 psi (has decompression mechanism),
I took off the muffler in case the issue was clogged pipes. No change. I replaced the spark plug. No change. The carb was an aftermarket so I put a Niche carb on with no change. I bypassed the fuel pump and that did nothing to solve the problem.
I don't know if this is a carb issue or an ignition issue. I am looking around locally for an OEM carb to try out but not sure that will fix the problem.
Can anyone help me solve this problem. I am running out of ideas.
Thank you for your time
Bill
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By Maddman200
Who agrees with me that Yamaha atv quailty was one of the best well built quailty machines money could buy, then 2007 came rolling in and they have gone to complete sh**. Cutting corners everywhere they can and made such unreliable machines
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By hunky
This old boy has been coastal so lots of rust. But when I turn the key, nothing. Green neutral light works, head/tail lights work. Was running fine when I parked it for a few months.. no issues with starter. This did happen once before (last year).. not sure what overcame it.. maybe playing around with gear shifter.. but not sure if that was what did it. But doesn't seem to do anything now when I play around with it while hitting the start button.
I did take apart the handlebar mounted start button housing and looked it over. Couldn't figure anything out there, but looked the same as when I had the problem last year. Put my probes on various wires there but didn't learn anything.. not sure how it is wired.
So this first image there is a connector with 2 wires coming from forward (the male part of connector) - one blue and one blue w/ red stripe. The blue continues down to a post near where the gear shifter enters the housing. (Second image). I was wondering about that.. I opened up the connector and the 2 wires (coming from forward) show continuity when I put my probes on 'em. Thought that was weird, but maybe supposed to be like that? I turned on the key and tested for voltage but didn't find any.
I'm just unaware of how to test for anything. Would be interesting to put 12 volts to the starter, but not sure about doing that or how. The wires going in are kind of hard to get to. I suppose I could take out the starter.. but wanted to ask if there is something easier to check first.
Thanks for looking!
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By wjmedic
Recently rebuilt front end on this Polaris 400. New axles, bearings, seals, control arm bushings, Hilliard clutch thoroughly cleaned and inspected with no damage noted.
Everything put back to together. Placed bike on jack stands all four wheels off the ground, started in 2 WD switched to AWD both front tires spinning, when AWD turned
off right front wheel will not disengage from AWD. Checked voltage at connectors both left and right connectors have no voltage with AWD switch off, and both have 12.4V
when AWD switch is turned on. Repeated turning switch on and off several times with no change in condition. I am thinking this must be something mechanical with the
Hilliard clutch on the right hub ie. weak spring or stuck rollers on the Hilliard clutch assembly (Is this a logical thought?) any ideas on trouble shooting this before I disassemble the
right front hub again
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