1999 cbr900rr hard to start help! - Honda Motorcycles - FireBlades.org
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post #1 of 11 Old 09-20-2013, 12:01 AM Thread Starter
 
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1999 cbr900rr hard to start help!

I have a 1999cbr900rr. I just had the carburators completely redone but when I start the bike cold it takes so much energy from the battery that it kills it. Then I have to hook it up to a car or battery charger and rev it for like 20 minutes before it will start. Once it starts it will continue to restart as long as the temp of the motor does not fall below about 140F. I do not believe it is the battery because the alternator charges it and the battery is strong when i try to start it until i completly exaust it. What might be causing this problem and has anyone had the issue in the past?
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post #2 of 11 Old 09-20-2013, 12:11 AM
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Re: 1999 cbr900rr hard to start help!

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Originally Posted by jatrix View Post
I have a 1999cbr900rr. I just had the carburators completely redone but when I start the bike cold it takes so much energy from the battery that it kills it. Then I have to hook it up to a car or battery charger and rev it for like 20 minutes before it will start. Once it starts it will continue to restart as long as the temp of the motor does not fall below about 140F. I do not believe it is the battery because the alternator charges it and the battery is strong when i try to start it until i completly exaust it. What might be causing this problem and has anyone had the issue in the past?

It wasn't doing this before you had the carbs "redone"?
What exactly does "redone" mean?
What do you mean by "rev it" while hooked up to the battery charger, how do you "rev" an engine that isn't running?
Does the choke work?
Have you tried spraying starter fluid into the intakes?

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post #3 of 11 Old 09-20-2013, 1:20 AM Thread Starter
 
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Re: 1999 cbr900rr hard to start help!

No it wasnt running at all before I had the carbs redone.
Redone meaning complete overhall.
Rev meaning open the throttle repeatedly.
The choke works but doesnt seem to help start the engine.
Ive used starter fluid and it helps start the engine but the problem is starting it cold without having to do stuff like that and hooking it up to a battery charger.
When the bike starts running it runs fine.
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post #4 of 11 Old 09-20-2013, 1:26 AM
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Re: 1999 cbr900rr hard to start help!

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Originally Posted by jatrix View Post
No it wasnt running at all before I had the carbs redone.
Redone meaning complete overhall.
Rev meaning open the throttle repeatedly.
The choke works but doesnt seem to help start the engine.
Ive used starter fluid and it helps start the engine but the problem is starting it cold without having to do stuff like that and hooking it up to a battery charger.
When the bike starts running it runs fine.

Then it sounds like the choke is not working.
Is the cable connected correctly?
Are the chokes actually operating on the carbs?
Opening the throttle while starting will make it harder to start.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #5 of 11 Old 09-20-2013, 9:41 AM
 
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Re: 1999 cbr900rr hard to start help!

Same thing on a Bandit i had years ago, it was the valve clearances. They were tight as a gnats chuff until the engine warmed up, when was the last time you had those done?
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post #6 of 11 Old 09-20-2013, 1:00 PM
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Re: 1999 cbr900rr hard to start help!

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Same thing on a Bandit i had years ago, it was the valve clearances. They were tight as a gnats chuff until the engine warmed up, when was the last time you had those done?

Bandit 1200's have rockers though.
Shims generally get tighter as they warm up.

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post #7 of 11 Old 09-20-2013, 1:03 PM
 
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Re: 1999 cbr900rr hard to start help!

BR i'm totally with you on that, however it did it twice when i owned it, both times the clearances needed adjusting as you couldn't get a piece of paper in there, and both times it cured it.
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post #8 of 11 Old 09-20-2013, 2:06 PM
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Re: 1999 cbr900rr hard to start help!

Sounds like the choke is not working, if there is no other issue. As BR said, make sure the air cut off valves are being actuated properly by the entire choke assembly all the way to where the cable connects.
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post #9 of 11 Old 09-21-2013, 2:31 AM
 
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Re: 1999 cbr900rr hard to start help!

Sounds like you need to hollar at guy who redid carbs.

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post #10 of 11 Old 09-21-2013, 2:25 PM
 
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Re: 1999 cbr900rr hard to start help!

Why would the carbs be at fault? It starts no problem when warm, just hard to start when cold.
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post #11 of 11 Old 09-21-2013, 2:28 PM
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Re: 1999 cbr900rr hard to start help!

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Originally Posted by Spaz View Post
Why would the carbs be at fault? It starts no problem when warm, just hard to start when cold.

Because a cold engine requires a _very_ different air/fuel ratio - that's why we need chokes (it's also why you don't open the throttle during starting). Yours don't seem to be operating. Did you remove the choke valves and ensure carb cleaner flows through them okay?

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder

Last edited by bladeracer; 09-21-2013 at 2:36 PM.
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