1982 CB900f - Reving, Redline Problem

I know, I know... it's not a KZ but at least they're similar bikes right? Anyways, hopefully someone could shed some light on my issue.

Here's some background:

1982 Honda CB900F

Stock carbs have been rebuilt. Sonic cleaned, lubed and new seals springs, even friggin' stainless allen screws through (cosmetic of course.) The only thing I haven't bought new is the float needles, float valves and plastic float bowls. The floats are not adjustable in my stock keihin carbs. Nor are the float/slider needles adjustable. As much as I hate the huge plastic annoying airbox, I put that back on since I was trying to use pods.

I have a 68 in the primary and a 105 in the secondary. Pilot screws are turned out to 2 1/2. Hook it all up, idles great, but give it a rev and it will stick and 2 rpm and then continually increase to redline. Will not come down unless I quickly turn out the fast idle adjustment then quickly screw it in for when it falls and I can keep it at a 1rpm idle.

It's not the cables, it's not the manifolds, I can't figure it out. Trust me it's not the cables. There plenty of slack in them. Choke is closed properly. I know my bike is running really rich because my plugs have becoming black carbon fouled. Sprayed plenty of carb cleaner around the manifolds to see if there's any air leaks. No change in idle sound.

I can't figure out what the hell is the issue.

The correct push/pull is set up correctly. I'm thinking it's more of a fuel flow issue now.

Here's a video of what's going on:

Plenty of honda forums. :laugh:


www.vintagehondas.com/forum/index.php

All the guys that really know those bikes are here: www.cb1100f.net/modules.php?name=Forums

I shouldn't have listened to my buddy to post on here....ha.... I'm already on those forums too.

Sounds like the float level is set to high, and I've never seen a float you couldn't adjust, usually by bending a tab.

Maybe it's a Honda thing. My float is set already because the whole float is plastic. There is no metal tab like on the KZ's.

I've narrowed it down to, not bench sync'ing the carbs from the start and there's something strange with my throttle mechanism. something is sticking.

+1 on what steel said. And as for the cables, if you want to be absolutely positive they are not a factor, just detach them from the carbs until you eliminate the main issue. Give it throttle at the carbs themselves and see if there any obstructions and that the throttle snaps back quickly. However, I wouldn't rule out an air leak. Set your idle as low when spraying around for leaks so you can notice the difference in the rpm's. Make sure you have a fairly clean air filter in your air box.

Edit: Not familiar with your model. But you may also want to check your timing advancer to make sure it is working properly. But I would think the rpm's would stay up in that case.