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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
 

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 

Has anyone had experience with the installation of the Optional RH Side Panel Close Off Kit as shown as p/n 2207445 which is supposed to help control the heat on the right side on my legs?  Right now that panel is wide open with excess heat on my leg.

Hey guys, I have a 1999 king quad. The right front brake locks up when I squeeze the lever. I can loosen bleed screw, fluid will come out and it unlocks. I'm thinking maybe wheel cylinder. Any suggestions?