hard start when hot?? - Honda Motorcycles - FireBlades.org
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post #1 of 13 Old 05-08-2014, 7:03 PM Thread Starter
 
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hard start when hot??

95 cbr 900. When I ride over 30 min and stop the bike will idle for about 1 minute, then slowly idle down till it dies. If I just hit the starter it will just crank but not fire. I can give it a little throttle and it will fire right up, but it will slowly idle back down till it dies. It also is very hard to get into neutral at this time.
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post #2 of 13 Old 05-08-2014, 7:49 PM
 
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Re: hard start when hot??

Have you made any recent changes to anything?
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post #3 of 13 Old 05-08-2014, 8:28 PM
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Re: hard start when hot??

If you raise the idle does it still do it?

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post #4 of 13 Old 05-08-2014, 11:15 PM
 
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Re: hard start when hot??

Is the choke cable free pulling and not binding open a hair.?

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post #5 of 13 Old 05-09-2014, 6:18 AM
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Re: hard start when hot??

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Originally Posted by Tannerlowe View Post
95 cbr 900. When I ride over 30 min and stop the bike will idle for about 1 minute, then slowly idle down till it dies. If I just hit the starter it will just crank but not fire. I can give it a little throttle and it will fire right up, but it will slowly idle back down till it dies. It also is very hard to get into neutral at this time.

Tank vacuum perhaps?

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post #6 of 13 Old 05-09-2014, 9:25 AM Thread Starter
 
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Re: hard start when hot??

No the bike was gravity fed and done this so I put a fuel pump on it and it still does this. The petcock has good vacuum. Choke cable is working freely.
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post #7 of 13 Old 05-09-2014, 9:41 AM
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Re: hard start when hot??

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Originally Posted by Tannerlowe View Post
No the bike was gravity fed and done this so I put a fuel pump on it and it still does this. The petcock has good vacuum. Choke cable is working freely.

As the engine is slowly dying give it a squirt of starter fluid into the airbox, if it picks up then it's probably not getting enough fuel, if it dies immediately then it's probably getting too much fuel.
What are the mixture screws set to currently?
You mentioned "30 minutes", is this 30 minutes of riding, 30 minutes of the engine running, 30 minutes from a full tank? When does she start again - when she cools down, ten minutes later, after topping up the tank, with a hit of starter fluid?
Was anything done to the bike since it last ran properly - any maintenance items, crashes, parked up?

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Last edited by bladeracer; 05-09-2014 at 9:49 AM.
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post #8 of 13 Old 05-09-2014, 1:22 PM Thread Starter
 
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Re: hard start when hot??

If I let it sit ten minutes it will start back up like normal its almost like when I gets hot it stops letting gas through at idle. It will run good with throttle open just no idle. If it starts dying down a quick hit of starter fluid will bring it back.
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post #9 of 13 Old 05-09-2014, 1:30 PM
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Re: hard start when hot??

did you adjust the idle?
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post #10 of 13 Old 05-09-2014, 5:22 PM
 
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Re: hard start when hot??

May need to do quick clean on carbs main curcuits and blow them out. new fuel Filter.

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post #11 of 13 Old 05-10-2014, 10:13 AM
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Re: hard start when hot??

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Originally Posted by Tannerlowe View Post
If I let it sit ten minutes it will start back up like normal its almost like when I gets hot it stops letting gas through at idle. It will run good with throttle open just no idle. If it starts dying down a quick hit of starter fluid will bring it back.

Have the float heights been altered?

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post #12 of 13 Old 05-10-2014, 2:23 PM
 
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Re: hard start when hot??

Sounds choke related to me.
Does it start a lil to easy after sitting a day or two.?

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post #13 of 13 Old 05-10-2014, 10:15 PM
 
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Re: hard start when hot??

If it's fine while cold and dies when hot it might be adjusted too rich on the adjournment screws.
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