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Idle speed adjustment

  • Thread starter Thread starter JCG
  • Start date Start date
J

JCG

Guest
Whats the difference between using my idle speed adjustment screw and my throttle cable to adjust idle speed?
 
Slack

Slack

Because, ideally, you should have a slight amount of slack on your throttle line when it idles. There's no reason to have tension on the throttle line when it's at rest. Personally, I think it "feels" better to have the line a little bit loose at idle.
 
When I tighten the screw on the throttle line my idle speed reduces, does this create slack, or would I turn it the other way?

Also, I just tried starting my bike up and when I hit the ignition all I hear is a click and sometimes it turns over. Any ideas about what this might be?
 
Loosen

Loosen

Loosen up your throttle cable and set your idle at the carbs so it's just right. Then, tighten up the cable so it's comfortable to use. As far as your other issue, your battery is low (or shot) or you've got a bad connection....it's one or the other and both are easy to diagnose and fix.
 
You need slack in the throttle cable at idle because the cable goes tighter and looser as you swing the bars from lock to lock. If your throttle cable is setting the idle speed, the engine will rev madly and drop revs as you swing the bars around. This is tailor made to cause a parking lot crash if you turn a corner and the bike surges unexpectedly on you. I always set mine to the minimum amount of slack that will allow me to go lock to lock without the idle changing. I would like no slack, but it is not usually possible.

Edit: To see if you have a bad battery, charge it overnight while off the bike. Let it sit for a day and then take a multimeter and see what the static voltage is on it. Below about 12.8V with no load and it is toast.

Mark
 
Last edited:
JCG said:
How do I tell between a bad battery and a bad connection?
Click to expand...

Check the voltage directly at the battery. If it reads ~12.5v then it's ok. If not then you'll know the battery's the problem.

If the battery is ok then check the grounding points. The frame acts as the ground for the entire electrical system. Probably the most significant ground is right by the fuse box/rectifier under the side cover. Unscrew it and make sure it's clean. Worth checking even if the battery is the culprit...

If the battery is the problem and it isn't charging while running the bike then search the forums for info on regulator/redtifiers.
 
Which way do I turn the throttle cable adjustment thingy to create slack?
 
Right in the middle of the carbs is a fixed plate that the throttle cable sheath is attached to. Below the plate the actual cable runs to the cam that rotates the bar that controls all four throttles.

Losen the nuts above and below the fixed plate and then back off the upper nut to allow more free play in the cable. The actual cable should appear just slightly limp when adjusted correctly. When you reach that point tighten the two nuts against the plate to keep it in place. The correct adjustment should allow just a hair of twist on the hand grip before the cable pulls the throttles.

The final test is to start the bike and turn the handlebars lock to lock without touching the throttle grip to see if the revs increase. If the revs increase then there's still too much tension in the cable.
 
There's a cable near my right hand grip that has a screw on it and when turned it changes the idle speed, what do I do about this?
 
The screw at the hand grip is ok but only allows for a small adjustment. If it's enough then cool!

Back off the knurled lock nut and then screw in the cable to add more slack. If it's enough then just screw the lock nut back down to keep it in place. If not then you'll need to look at the other end of the cable.
 
Understanding that you may not be mechanicaly inclined but some trial and error is usually a good thing.twist the nut out...the idle will either go up or down. not rocket science.
 
Odd

Odd

Hasn't anyone besides me realized that there's something odd about all of this?????:confused: Do a search and read ALL of our new friend's posts. This can't be for real....
 
Last edited:
chuckycheese said:
Hasn't anyone besides me realized that there's something odd about all of this?????:confused: Do a search and read ALL of our new friend's posts. This can't be for real....
Click to expand...

Wow! Exellent response, especially for new subscrbers.
 
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