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Weak yellow spark at the plug - RF 400 R Suzuki Motorcycles

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Could be a bad coil.

Posted on Oct 15, 2013


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Posted on Jan 02, 2017

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SOURCE: firing on one cyl. weak spark

does each plug have its own seperate coil? if so, i would say the coil for the weak cylinder is faulty

Posted on May 24, 2010

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SOURCE: 1991 dr650.Will not start. Has

Install new plugs and be certain the battery is fully charged. Clean the air filter then give it a shot of spray starting fluid when ready to start up the engine. Please, rate my answer. Thanks.

Posted on Apr 25, 2011

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Might have a weak spark. I'm thinking it should be more white/blue. Might need to clean the spark plugs if they have a lot of build-up. A little fine grit sandpaper will help, but just enough to clean the spark gap.

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check the spark output at the coil. If there is still weak spark than make sure there is 12 volts to the coil. If there is than the coil is probably bad.

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