It may just be that the butterflies are sticking a little mate. Might be worth pulling it all apart and giving it a clean... there is a few things that will mess with the tune here though so if you aren't confident take it to a shop.
I'm quite aware of the different things that can effect a tune, I wish i had access to a honda scan tool so i could take a flight record of when its doing this so i could see throttle % and other items. The butterfly's were clean last time i checked and i did lubricate the cables and everything is free and not hanging up.
Last edited by Slickrick592; 04-09-2012 at 01:30 PM.
Im thinking it has to do with the idle air control valve. I replaced the IAT sensor, IACV sensor, and the map sensor. Still having this issue. For whatever reason the IACV is dumping extra air into the throttle body. The IACV is basically a bypass from the top of the butterflies to undernearth them. The idea of this IACV is Honda cheap and poorly designed effort to reduce wheel hop when you let off the throttle at high RPM's. Im still trying to figure out a solution to this problem and have done LOTS of research with no fix yet. I narrowed it down to this problem happening when the engine has been running up to operating temperature. Will ride for 3 hours straight or half hour. When I shut it off for a short period of time and restart it is when it occurs. My next thought to this fix is upgrading to an HRC ECU?? or flashing the ECU?? Anyone try this yet?
i have a very similar problem. I did a pair removal, manual cct, and reinstalled a zbomb and when i got back on the road noticed there was no engine brake (Sometimes or very weak). I tested the bike at 3rd gear let off at 40mph and it VERY VERY slowly decreased speed maybe 1 mph every 2 secs.
When i did the pair removal i used the Driven plates and left the reeds and baffles in. Should i have removed them? either that is causing it or like Joey said a sensor when bad during the process. I know inorder to get the airbox out i had to be a little rough since the harness is really tight. I'm planning on looking at it again tomorrow she's been sitting in the garage for a couple weeks now.
Leaving the reeds and baffles in doesn't matter, even though you should take them out. IACV is the issue. If you put a fuel controller on a 07-08 600rr, you are going to have lack of engine braking. You could disconnect the IACV, but I'm not sure if this will screw up other things?
If you remove the IACV it won't idle correctly any more, if at all. And that's assuming he has an 07+. If it's an 03-06 it could be that the throttle body (starter valves) need balancing.
I'm experiencing the same issue on my 09 600RR. I'm stock besides a slip-on. Happens at all gears/ ~4-6k RPMs and notice it more a high speed while I'm slowing down.
I'm going to have my bike serviced soon and would like some ideas on where to start.
