Starting trouble when engine is still warm - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 05-25-2018, 11:29 PM Thread Starter
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Starting trouble when engine is still warm

When starting cold, my 750 starts just fine. If while on a ride, I turn it off for a short while (taking a break, eating out etc.) it struggles to start again. It will often backfire during this process as well. I have no idea what's wrong. I've had the bike for only a year and absolutely love it, but this drives me crazy! Any suggestions?
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post #2 of 11 (permalink) Old 05-26-2018, 10:21 AM
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Some tips, in no particular order:

1) AGM type battery

2) Use choke after short stops

3) Leave throttle closed during starts (and use choke)

4) Pickup coil mod
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post #3 of 11 (permalink) Old 05-27-2018, 03:29 AM
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hmm, They all do that, I wonder what really causes this ? its a pain in the ass , You can ease the symtoms as spock has suggested but I have never really eradicated the problem but look at it as one of those odd things that make these bikes great. You Just have to wait a while till its ready to restart ,but don't rush it.!!

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post #4 of 11 (permalink) Old 05-27-2018, 11:39 AM
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I moved down my pick up coils to 0.018", crack the throttle just a hair and it starts warm/hot every time.
Choke always makes my starting impossible except when stone dead cold. Even then, more than 1/2 hurts more than helps.
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post #5 of 11 (permalink) Old 05-27-2018, 11:47 AM
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A good AGM battery and just giving it a tiny bit of throttle after hitting the starter solved this issue for me.
Most have found the pick up coil mod helps a lot too.
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post #6 of 11 (permalink) Old 05-29-2018, 06:56 PM
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I'm going to say what everyone else here already has: pickup coil mod & AGM battery. My bike use to not start after fueling up, & I finally gave in to do the pickup mod. Starts flawlessly every time now, and even easier with the AGM battery. Still have zero idea why these bikes behave this way...
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post #7 of 11 (permalink) Old 05-29-2018, 10:30 PM
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Quote:
Originally Posted by SergheiS View Post
I'm going to say what everyone else here already has: pickup coil mod & AGM battery. My bike use to not start after fueling up, & I finally gave in to do the pickup mod. Starts flawlessly every time now, and even easier with the AGM battery. Still have zero idea why these bikes behave this way...
My 700 never needed the pickup coil mod. Wolfie believed the 700's were built better...

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post #8 of 11 (permalink) Old 06-04-2018, 11:53 AM
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Pick up Mod ,Its the one thing left that I have not done so must do it this summer, also I will clean out the ignition switch as some have mentioned this as a fault too.

Vn 750 A2 1986 rebuilt engine, crank shaft, half casing,shell bearings,con rods,rear cylinder head,oil pump,water pump ,(had ceased bearing rusted up),tie bar upgrade,clutch basket drilled,front cylinder cam chains,toc springs,stator,shaved, rectifier,agm battery,solenoid ,starter motor (used) re-spray ongoing.
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post #9 of 11 (permalink) Old 06-04-2018, 04:19 PM
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I did it on mine and it didn't do anything. My bike didn't start behaving well until I did the tw200 petcock mod. I know it sounds crazy but everything Clicked after that.

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post #10 of 11 (permalink) Old 06-13-2018, 05:42 AM
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maybe you had an underlying problem and the fuel tap solved it ?. anyhow I have done the pick up mod and all seems ok, so will see how it goes , not done hot start yet !!!.

Vn 750 A2 1986 rebuilt engine, crank shaft, half casing,shell bearings,con rods,rear cylinder head,oil pump,water pump ,(had ceased bearing rusted up),tie bar upgrade,clutch basket drilled,front cylinder cam chains,toc springs,stator,shaved, rectifier,agm battery,solenoid ,starter motor (used) re-spray ongoing.
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