Question about 1987 Yamaha YX 600 Radian

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1986 Yamaha Radian stops running after 20 minutes

My 1986 Radian 600 runs with slight popping for about 20-25 minutes, then begins running rough, loses power and shuts down. After 30 minutes of being off, it starts back up again and runs a little while longer before shutting down again. It seems pretty hot when it shuts down.

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  • Wesley Turner Apr 09, 2010

    I had the carburetors rebuilt and put in a new petcock with screens, but the problem still seems to be there.

    I took it to a repair shop, and they suggested that this might be related to ethanol and suggested an additive. This may or may not be helping. The bike seems to run, but I haven't actually stressed the system by going for too long a ride since pushing it back home is a pain. :-)

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Sounds to me like it could be a few things... pretty interesting that it runs and shuts down...sits for a little while then fires back up. Could be something as simple as a bad ground.. maybe it needs cleaned.. if the ground is making very little contact.. the bike would run bad, and because its direct current it has to flow. The metal in the motor frame etc will hold so much DC current.. but *** soon as it load up the bike would stop sparking. Let it sit for a while, DC trickles into the battery through the slight contact, bike fires back up. OR could be bad venting of your fuel tank, or a partial clog at the pet ****.. the first is pretty easy to check, open your fuel cap and start the bike..if it does the same thing then its not a vent problem. One thing that does happen on the Radian, is the reserve fuel screen inside the tank comes loose, and then everything inside the that has built up over the years either partially clogs the pet ****, or the hose, or both. Take the tank off, pull the pet **** off..if it still has two intact tubes with good screens..you probably don't have any junk in your line..but I would pull the line off and blow through it any way... it could be some type of blockage, when the bike sets the fuel seep through, but when it runs it eventually creates a vaccuum that stops the fuel flow. Those are my two first thoughts... good luck!!

Posted on Jun 07, 2009

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I have no solution but I am having the same damn problem w/ my 1984 Honda Shadow 500. Get to me and let me know which it was. Good post Molexis5 I'm gonna start running through these possibilities myself.

Posted on Apr 02, 2010

Testimonial: "Carbs and petcock were bad, but the problem still occurs. Repair shop suggests ethanol as the culprit and sold me an additive. Not sure it works yet"

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I have a couple of bikes one a yamaha 1980 xs, every few months it needs the tappits adjusted and the timing adjusted, the timing seems to go out on these older bikes, also maybe check / clean your air filters and put in new spark plugs, if it still running rough it probably the timing.

Posted on May 27, 2009

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