2002 kawasaki VN 1500 Vulcan Classic Logo

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Anonymous Posted on Jun 01, 2017

Hesitation at low rpm

Bike hesitates at low rpm. Once taking off from a stop and you turn throttle a bit to speed up it hesitates for about a second and then it catches up with throttle and lunges or jerks forward like a quick thrust of speed only for a second and then everything is fine. I only notice this taking off from a stop and from first to second gear. It has Vance and Hines pipes. Don't know if carb has been rejetted or adjusted. Just bought the bike about 1 1/2 months ago. Any suggestions?

5 Related Answers

bikedoctor

  • 33 Answers
  • Posted on Feb 09, 2009

SOURCE: seriouse power dip at low rpm

Plug gaps are incorrect. They are too tight. The gap of a plug has direct effect to ignition timing. Too tight and timing is advanced. Too fat and timing is retarded. use a decent wire gapping guage (not the 99cent key chain gapper) tool is a FEELER guage not force guage. gapped right and your problems solved.

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seakish

  • 492 Answers
  • Posted on Apr 29, 2009

SOURCE: 1999 GSXR 600 ---> Hesitating and bucking??

Check the tank for water or crud. Also drain the carbs to make sure the floats aren't obstructed.

Anonymous

  • 221 Answers
  • Posted on Jul 02, 2009

SOURCE: Hesitation.

transfer ports could be pluged or ilde jet could use adjustment

Anonymous

  • 311 Answers
  • Posted on Jul 10, 2009

SOURCE: Which size Jet Kit for 800 Vulcan Classic?

general rule of thumb is to go up about 10 jet sizes,unfortunately it is a bit of trial and error,and you may have to swap out diferrent sizes to get the bike running right,(jets are quite cheap though)but first step about 10 sizes from standard,your local dealer should be able to tell you what jets are in it and supply replacements,if you change to a hgh flow aftermarket air filter you may have to change jet sizes again as changing the filter may effect the mixture ratio in the carbs,,hope this helps

Anonymous

  • 8 Answers
  • Posted on Dec 12, 2009

SOURCE: bike backfires,dies,restarts runs fine

your carbs are dirty. and probably need to be balanced also... bring the bike bto a garage and have them cleaned by a profesional.... also after market pipes don't give your bike the proper back pressure .. that can mess up your carbs timing

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