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I have an 1984 yamaha venture and it will not run on yhe front 2 cylinders have checked spark and fuel they are good

At high r.p.m one of them will run but thr other one still dead

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Anonymous

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Posted on Nov 26, 2011

Anonymous

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Hello Charles, if you have spark, and fuel, then start troubleshooting by checking for vacuum leaks...a vacuum leak will allow unmetered air to enter the engine creating a lean fuel mixture, the cylinder will not fire if it's too lean. Replace the spark plugs and buy a spray can of carb cleaner. Let the bike idle and spray the cleaner around the carb mounts & all the vacuum hoses. If the RPM's change, the engine has suxed some in & you have a leak. Try this & let me know what you find. Also read the old plugs, are they wet, gas soaked ,black & fouled - dry and off white...etc. Let me know what you find. I hope this helps.

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Inspect the spark plugs: Remove the spark plugs from the front two cylinders and inspect them for fouling, wear, or damage. If the plugs are worn out, fouled, or damaged, replace them with new ones of the correct specification.
Test the ignition coils: Although you mentioned replacing the front coils, it's still possible that the used replacement coils are faulty. You can test the coils using a multimeter to check for proper resistance values. Consult the service manual or contact a Yamaha dealer for specific resistance values and testing procedures for your particular model.
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