The International CBX Owners Association

First of all, thanks for all the replies on the leaky needle & seat assemblies.
Tapping each float bowl seats the needles, no more dribbles!
So, it starts, but will NOT idle below 2200rpm. Very odd, and the local Honda mechanice says "LEAN!" So we went out to 2 turns on the pilot screws. No go. Still won't idle, which makes carb sync next to impossible. BTW, it has a Dyno Jet stage 1 kit in it, and a K&N filter in the stock airbox. Otherwise totally stock, even the exhaust.
It's been suggested to put the stock Honda needles back in, but I did some measuring at the end of the needle. Dynojet is 1.26 mm, stock is 1.68 mm, which would lean it out even MORE. Odd, too, the DJ needle is straight for the first 1/2" or so where the stock one is in fact tapered all the way.
Anybody else have to do a LOT of fiddling with a Dynojet stage 1 kit?

Thanks guys!

That would be your idle circuits, nothing to do with you needles Al. Guessing, you may have blocked idle jets ?? What do the plugs say ??

That was my thought on it too, and even though I'm 98% certain none of the pilot circuits had obstructions, I guess I better investigate that other TWO percent!!!
I'm getting VERY good at carb extraction.......

Lots of other issues may be at play, for an example make sure it isn't an ignition problem, the advancer mechanism "may" be stuck WFO ?? Valve clearances can be an issue also...

Choke, does it change anything ??

I actually was going to fire it up & roll the choke closed & see what happens, but at this point I am still thinking plugged pilot circuit, so will (again... ) extract the carbs and see what's up. Also went a little "chicken" on the float levels (tired of the leaks) so need to get them up to 15.5 mm instead of the 18 where they are now. But I still intend to make this work with the DynoJet Stage 1 kit.
Other thing that's a little fishy, is I don't think the K&N filter in the stock airbox is seating all that well. Have the factory spring clip bEhInd it, but was there a second retention device in there that I'm not aware of? Or a foam ring around the sealing surface?

Also, did you do anything with the cams? The original service manual has a mistake showing the cams installed wrong!

Nope, only had the valve cover off to do valve clearances (I remember reading that the photo in the manual was wrong! D'oh!!!). And the cams are NOT like the picture. How was that, when the #1 lobes are pointed TOWARD the spark plug, the #6 lobes should be pointed away from the plug?
Funny thing is, it revs out just fine, so this seems to be a low-end only problem. Must not have been thorough enough with my pilot-jet cleaning attempts. That's the one thing that makes the most sense right now.

How are your carb rubbers between carbs and cylinder head? A leak would cuase a no idle -lean. Mike

big al wrote:Other thing that's a little fishy, is I don't think the K&N filter in the stock airbox is seating all that well. Have the factory spring clip bEhInd it, but was there a second retention device in there that I'm not aware of? Or a foam ring around the sealing surface?

Yes, there is a foam ring that sits between the filter and the airbox sealing the mating surface. If you don't have it and the filter sits loose, I would say you have almost no air resistance, i.e. lean.

Steve

I have also (as many of us have) the K&N filter dropped in stock air box. As the K&N filter does have the "stopper" only in spring clip end (not in both ends as the stock filter has) you must install the filter carefully.
But I think this possible air leak via filter is not the root cause for high idle...at least my bike idles ok without filter.

Have you checked the throttle cables? How about choke cable and mechanism? Also already asked the plugs colour?
Are you sure that problem is related to lean issue?

Big Al,,,, Whats the latest on your idle problem?

What fixed it or is it still existing?

Seems like it would be hard to ride that way.