Tough Start - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 7 (permalink) Old 06-14-2012, 10:14 PM Thread Starter
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Tough Start

I'm new here so I am probably repeating a subject. My 2005 VN750 is hard to start in the morning. I have to full choke it and not touch the throttle. When it starts it idles on choke untill it warms up. At takeoff it kinda bogs down untill I get rolling. I can open the throttle and it will take off, but it just isn't crisp. I have only had it a few weeks. I first put in low grade fuel untill I read it needed high octane. I got a pint of octane booster and poured in a little in a half tank of fuel and went and filled it up with high octane. It didn't make much difference. I bought new plugs and installed them with no difference. If I crack the throttle on startup it takes forever to get the choke no choke combination down so it will start. I thought about taking the carbs off and going through them. Any thoughts?
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post #2 of 7 (permalink) Old 06-14-2012, 10:29 PM
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First thing is that you do not need high octane, 87 is just fine. Our bikes do not like to take off cold, let her warm up first.

R/R Relocated
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post #3 of 7 (permalink) Old 06-14-2012, 10:41 PM Thread Starter
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87 it is, thanks.
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post #4 of 7 (permalink) Old 06-14-2012, 11:41 PM
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I almost always start mine with the pseudo-choke on (its not really a choke)...after 30 seconds, I go to half...then after 2 mins, turn off and ride (mines 27 yrs old and modded)....only time a VN will start no choke is with a new battery, iridiums, and all else stock...Ive done it cupla times w/o, but it was 90 degrees out...
Hard starting oft signifies contaminated fuel...try some SeaFoam for a tank or two...



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post #5 of 7 (permalink) Old 06-14-2012, 11:48 PM Thread Starter
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Thanks Wolfie
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post #6 of 7 (permalink) Old 06-15-2012, 11:42 AM
Crap, I WAS in 5th gear.
 
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Sounds like your carbs may be lean at idle. Check the idle screws- count exactly how many turns it takes to seat them (clockwise) and write it down. If they were less than 2-1/2 turns out, back them out to 2-1/2 turns. If this does not help, then you may need to pull the carbs off and check them out. Dirty pilot(s) can cause hard starting. I ended up installing one size larger pilot jets, and I only need choke to start when cold, and then for about 30 seconds.
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post #7 of 7 (permalink) Old 06-15-2012, 06:10 PM Thread Starter
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Thanks Kelly I'll try that
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