Question about 1994 Suzuki GSF 400 Bandit

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Dropping cylinder at 10rpm and possible generator /stater problem

Hi, couple of questions for you.
with a fully charged battery, bike starts and runs fine upto 10rpm - then misses, seems like its dropping left hand cylinder at 10rmp - losing 8bhp on rolling road at 10rpm.
also, after riding for about half an hour, engine will splutter and eventually stop, at this point battery will be drained and starter will not turn over, whats strange is i can bump start it with lights off and ride longer, but if i turn the lights on, engine dies, like its losing spark.
have had the battery checked and apparently its ok, what do you think?
generator / stater faulty - not charging battery and when battery is dead it loses the spark? whould that explain why when the battery is dead and you have the lights on the engine dies? what else could it be?
what about dropping a cylinder at 10rpm? coil packs? or related to other problem, surely if one coil pack was faulty it would drop 2 cylinders if one coil pack supoprts two cylinders?
where would the cdi unit come into this? i dont know what it does.

hope you can help

Many thanks

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  • gmckenzie Sep 08, 2009




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  • Suzuki Master
  • 767 Answers

It seems the charging system of your bike is not working
Recharge the battery and thn fit it in the bike and start it and check the charging rate.
Remember with lights 'on' it drains power from the battery butthe charging system of theengine takes over i.e. if its working alright, with your explanation, its for sure the charging system is not functioning.
Chekc the altenator and the rectifier.

Posted on Sep 08, 2009


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