I have a 2007 Vulcan Classic LT 900 with 65,000 miles on it. During...

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I have a 2007 Vulcan Classic LT 900 with 65,000 miles on it. During hot weather (90's) at highway speeds, the engine will suddenly start cutting out usually during slight acceleration. It's almost like I'm flipping the kill switch on and off several times very quickly. No perceived backfiring. If I hold the throttle full open, the engine will smooth out for a few seconds, then as I let off of the throttle, the problem will start again. I commute 110 miles a day, so fuel is always fresh. This only happens during hot weather--there is never any problems during the morning commute or when temperatures are cooler. Recent oil change made no difference. I run premium fuel.

Last updated 6/22/2017

Relly De Jesus

Kawasaki Mechanic

Hello and welcome to ExpertHelp.com! My name is Relly De Jesus and I'm going to do everything in my power to answer your question to your full satisfaction!

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Posted 5/28/2017

Relly De Jesus

Kawasaki Mechanic

Hello Dan

How are you doing? There are two possible reasons why this issue occur. First, a faulty fuel pump may fail during hot temperatures. Second is a failing water pump can make your engine hot during hot weather.

Fuel pump

Water Pump Diagram

If you haven't replaced the fuel pump yet you can start from there Dan. But it's best to have it checked physically by a reputable bike mechanic to know the other cause. Hope this helps Dan. Is there anything else I can add or help you with? I'll be standing by for your response.

Thank you

Relly

Posted 5/28/2017

Relly De Jesus

Kawasaki Mechanic

Hi Dan

How are you doing? This is a follow up regarding my assistance. Is there anything else I can add or help you with? Hope you find it helpful and please keep me posted on the progress. I'll be waiting for your response.

Thank you

Relly

Posted 6/1/2017

Relly De Jesus

Kawasaki Mechanic

Hi Dan

Thank you

Relly

Posted 6/2/2017

Relly De Jesus

Kawasaki Mechanic

Hi Dan

Thank you

Relly

Posted 6/5/2017

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Kevin
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I have a 2007 Vulcan Classic LT 900 with 65,000 miles on it. During hot weather (90's) at highway speeds, the engine will suddenly start cutting...

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