Kawasaki Motorcycle Forums - View Single Post - High idle

bobcharles · 07-25-2008

The diaphragms are intact, I triple checked each one carefully for holes and tears. The slides move easily... no rough spots where they'd stick.

cable is moving freely, I've watched the butterflies and cable when I work the throttle.

I rode just not long ago coming home on a cool night, and it was behaving worse than during the day when it was warm. From start, with choke, it was at a 'normal' idle, only around 1200 ish. Still had nice response, and working it up to 4k made it stay there. Let it idle for a minute like that, then dechoked.
promptly tried to die, but I worked it back up manually keeping the RPM around 2k.
I also don't know if I mentioned it in my first post, but I have the idle speed adjustment backed out all the way - it's not even touching the notch on the throttle control. PUtting it in, even a little bit, makes the high idle problem, obviously, significantly worse.

Rode like that the entire way home. It's really lacking power, it feels like I'm driving a 250cc bike. WOT in first gear didn't really do a whole lot.

Also backfired twice when coming down from a high RPM - about 6k I think.

Also, I do not know how I forgot to mention this, but the outside pipes are significantly cooler than the inside ones. I thought it was due to increased airflow, but it's just too big of a difference, I think, when its not moving.
The inner pipes can be hot where you can feel the heat from inches away, and they're making the frame in front of them warm, while the outer ones you can almost touch them. They'll still burn you if you touch them (as I accidently did), though. There's also a difference in cylinders 1 and 4. Cylinder 1 is usually cooler than 4.

First thing I checked was spark, and they're sparking fine. Nice blue sparks on both plugs.

I am thinking the carbs are so unbalanced that the inner two are doing most of the work?

But then it doesn't explain the racing hot idle. I am so confused with this thing. I wish I could pay someone to show me what to do. Don't really want to take it to a shop, since they likely won't let me sit there the whole day and watch...

07-25-2008	#6 (permalink)
bobcharles Newbie Join Date: Jun 2008 Posts: 19	The diaphragms are intact, I triple checked each one carefully for holes and tears. The slides move easily... no rough spots where they'd stick. cable is moving freely, I've watched the butterflies and cable when I work the throttle. I rode just not long ago coming home on a cool night, and it was behaving worse than during the day when it was warm. From start, with choke, it was at a 'normal' idle, only around 1200 ish. Still had nice response, and working it up to 4k made it stay there. Let it idle for a minute like that, then dechoked. promptly tried to die, but I worked it back up manually keeping the RPM around 2k. I also don't know if I mentioned it in my first post, but I have the idle speed adjustment backed out all the way - it's not even touching the notch on the throttle control. PUtting it in, even a little bit, makes the high idle problem, obviously, significantly worse. Rode like that the entire way home. It's really lacking power, it feels like I'm driving a 250cc bike. WOT in first gear didn't really do a whole lot. Also backfired twice when coming down from a high RPM - about 6k I think. Also, I do not know how I forgot to mention this, but the outside pipes are significantly cooler than the inside ones. I thought it was due to increased airflow, but it's just too big of a difference, I think, when its not moving. The inner pipes can be hot where you can feel the heat from inches away, and they're making the frame in front of them warm, while the outer ones you can almost touch them. They'll still burn you if you touch them (as I accidently did), though. There's also a difference in cylinders 1 and 4. Cylinder 1 is usually cooler than 4. First thing I checked was spark, and they're sparking fine. Nice blue sparks on both plugs. I am thinking the carbs are so unbalanced that the inner two are doing most of the work? But then it doesn't explain the racing hot idle. I am so confused with this thing. I wish I could pay someone to show me what to do. Don't really want to take it to a shop, since they likely won't let me sit there the whole day and watch...