idle problems, and shifting after a crash. - Sportbike Forum: Sportbike Motorcycle Forums
 
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post #1 of 5 (permalink) Old 03-05-2008, 04:48 PM Thread Starter
 
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idle problems, and shifting after a crash.

I crashed my 88 honda 600f hurricane a few days ago. It was a lowside onto the left side of the bike. Slid on the left side for a good 10ft. The left side fairing has substantial damage and will need replacing. But there's a couple problems im now having with the bike that werent present before the crash.

1. I have to give the bike more gas upon startup, and after startup, the bike idles really low. Even with the choke on, the rpms are way lower. Also after startup, It seems i have to give the engine some throttle to keep the rpms up, otherwise it just stall n dies. But i can keep it going with the throttle. Someone mentioned to me that I can adjust the idle screw/switch. Could this be the problem? where can I find this?

2. second thing i notice, is that from shifting into first is noticeably harder than before the crash. Its not enough to make it incredibly difficult to shift, but more like i have to give it a slight stomp. It is harder than before. What could the problem be here? is there anything else i need to check for? could this be a bigger problem affecting other gears?

Any help will be greatly appreciated. And I am new to bikes so, i'll need a lot of help.
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post #2 of 5 (permalink) Old 03-05-2008, 06:57 PM
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With the bike sliding on the left side yes it probably bumped the idle adjustment. You should see 2 things you can turn just under the tank toward the seat in the fairing if I remember correctly. I had the 89 600F. One is the dial to turn the tank to res. and off. The other is a small plastic thumb screw this is you idle adjustment. As far as you gear lever, with it going down on the left side. It may have bent the lever and put it in a bind. Look at it closely, move it up and down with your hand as you watch to see if it is binding somewhere.

Ride it like you stole it, and keep the rubber side down.
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post #3 of 5 (permalink) Old 03-24-2008, 03:01 PM Thread Starter
 
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Thanks for the reply.

The problem with the shifting was fixed by adjusting the clutch cable at the handlebar.

As for the idle, I adjusted the idle screw to get the idle around 1500rpms.

Even though I got the idle adjusted, the engine cant seem to hold a steady rpm. The needle on the tach fluctuates. And sometimes even dips below 1500 and rises back up after i give it some throttle. The rpm fluctuations arent very extreme, around 100-300rpms.

What should I do to get my bike to idle at a steady rpm? What should I check, and what maintenence would be required? Any help would be appreciated.
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post #4 of 5 (permalink) Old 03-25-2008, 07:53 AM
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That's one thing I've never been good at, setting up the carburetors. It sounds like when you dropped it that it may have knocked something loose inside the carbs. Maybe a jet got knocked loose or an O-ring or something like that. It could be allowing extra air into the carbs. If that's the case it will not be able to hold a steady idle as it can't keep the air fuel mixture steady. I would take it to a mechanic that you trust and have them to work on it. In the long run you will be better off.

Oh and on that bike I think the idle was set at 900 rpms, so you should try to set it as close to that as you can.

Ride it like you stole it, and keep the rubber side down.
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Last edited by Nashcbrguy; 03-25-2008 at 07:57 AM.
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post #5 of 5 (permalink) Old 03-25-2008, 09:38 AM
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Well, if the fuel/air mixture is routed from your carbs to your engine using rubber tubes then the first thing I'd try is making sure those clamps are on tight. If the rubber is hard you may have punctured one or more and need to replace them. Not costly and generally not hard to do.

It does sound like a carb problem but you could pop open the airbox to make sure its dry. Sometimes "crud" breaks loose and ends up messing with your idle passages in the carbs, leading to my next suggestion.

The next thing I'd probably do is to pull the carbs out and give them a nice, thorough cleaning. You'd need to pull the jets and other removable parts so they can be soaked in carb cleaner as well as using spray carb cleaner to clear out all the orifices. Then put it back together. If this is your first time, you'd be wise to invest in a service manual.

Then you could synchronize the carbs, which requires a special gauge and, again, the service manual. If you think you'll be dumping the bike in the next two years, this part might best be left to a local shop.

EDIT: I have no idea what I was smoking but the airbox to carbs has no real effect. I meant the suction into the engine from the carbs. Corrected!

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Last edited by kanwisch; 03-26-2008 at 09:16 AM.
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