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Mechanics 101 Can't get it to run right? Find a trick to add HP?
From the first oil change to completely rebuilding the engine,
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Old 01-11-2010, 07:56 AM   #1
kat_pilot750
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Default wont start in cold

Hey guys, my 2000 750 has an issue starting in the cold. It'll initially start and run for a few seconds then die when i let off the little throttle that I use during start. When it's warm, I'll let off the throttle and the rpms will drop then go back to a normal warm up rpm for the full choke. But cold, it just dies. And after that, I can't get it started no matter what. Any suggestions?

And "cold" is 30-50 degrees-ish.
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Old 01-11-2010, 08:08 AM   #2
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Are you using the choke? Try setting the choke at half way, and starting her up. Adjust the choke as the rpm's increase to keep her under 2000 rpm for a few minutes, and then without any choke, she should idle in the 1100 rpm range.
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Old 01-11-2010, 08:58 AM   #3
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yes, I'm using full choke. Later today it should be warmer so hopefully I'll have some better luck then. I'll try usin 1/2 choke and let you know how it goes.

Thanks!
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Old 01-11-2010, 09:27 AM   #4
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I had the same issue with my 06 600, what I did was on full choke I cranked it over a couple of seconds with no throttle and repeated that a few times. I then put it on half choke and it fired right up. After fire I put it on full choke until it warmed up. Hitting the throttle seemed to make it worse
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Old 01-11-2010, 10:29 AM   #5
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The "choke" is a fuel enrichment system. The more you pull the lever, the more extra fuel your adding.

The throttle opens the butterflies. The more you turn the throttle, the more air your adding to the sytem.

Cold engines need a richer mixture to start, and this is the reason for the enrichment sytem. If you open the throttle, your countering that by adding air.

So basicly... if opening the throttle helps you on a cold start... use less choke. Your shooting for a position that will start the bike with no throttle used at all.

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Old 01-12-2010, 04:26 AM   #6
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as a air/oil cooled bike they will be a bit tempermental to start until you find that sweet spot and remember it everytime you go to start it up. I would also do some prevenitive maintance and check/change the spark plugs. You could be flooding it by over choking. That right there will cause a even harder time starting.
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Old 01-19-2010, 03:22 PM   #7
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So I figured out that it was user error. I typically give it a smidge of throttle on start up and then let go of it after it cranks up. I found out that I was letting go of the throttle too early and as long as I hold the throttle for about a full second she'll stay running and not die. One of those quirks I guess
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Old 01-19-2010, 03:46 PM   #8
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you should just ship it to FLA (pm me for address) and get a new one...


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n/m your in FLA, I'll come pick it up whenever your ready....
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Old 01-19-2010, 04:13 PM   #9
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Just an FYI I found out while I'm working on my 1999 Kat 750. Under the tank is an inline fuel fitler...if it gets dirty it will effect cold starts. It may not have anything to do with your concerns, but hey FYI right....
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Old 01-20-2010, 08:14 AM   #10
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Interesting katat, i'll have to take a look at it next time I have the bike apart thanks for the tip
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