Viper help

A

arcticwolffman

New member
Joined
Jan 20, 2017
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Indiana
I am hoping someone can help me. I have a Yamaha Viper (2003) that will cut out, it seems to be running on just one cylinder. This will go on for maybe 15 to 20 seconds and then clear up and run on all three again. It is an intermittent problem, the only consistency i can nail down is it seems to happen after getting on the throttle pretty good. I am hoping this is a fairly common problem that I as a new Yamaha owner am just not aware of. Any help would be great.
 
A few things could be wrong.

Tors could be acting up. Throttle over ride system. Make sure you have lots of slack in throttle cable at carbs. For testing you can disable the tors by unplugging the bullet connectors between carb and wireharness and plug back into each other. Second could be a wire harness rub through under engine. Both common problems as these Sleds get older. A search on "tors" and "wire harness rub through". Will yeild tons of detailed info. Welcome to the site and continue to ask and post back with results.
 
Good to check the things super1c mentions above. Also the time to diagnose is immediately when it happens. Try flipping your starter (choke) open to see if runs good again. This would indicate a lean condition. Make sure you "catch it" several times though so you know the timing isn't just a coincidence. Another test before it picks up again is to shut it off and see if any of the 3 plugs are wet (not oily) indicating lack of fire. Can also be a stator but they usually are more consistently bad in multiple situations.

Another item is ensure that your clutches are shifting back out (primary open /secondary closed).
 
Another possibility could be plug caps. Sometimes you can give the boots a little twist on the wire and get good connection again.
 
drew24 said:
Another possibility could be plug caps. Sometimes you can give the boots a little twist on the wire and get good connection again.
Click to expand...

good point - you can test them with an ohmmeter (or digital meter that measures ohms :-) ) - should be 5K ohms approx.
 
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