Fast Idle Question

Hi All,

I bought a 2006 in the spring of this year. It only had 400 KM on it and I have put about 2400 on it since. I have noticed the following recently and was wondering if anyone could shed some light on these:

1. The bike does not seem to fast idle anymore. If I start the bike when cold (or warm) it idles at 1300 rpms. In the spring, it used to idle at 2000 rpms when cold and then drop as it warmed up (which I think it should). Mind you, it is now warmer when I first start the bike (e.g. 70 degrees or warmer). This is my first FI bike so not sure if this is normal.

2. When I ride at a constant speed at 4000 rpm or so, I sometimes notice some lurching. It's like it isn't getting air or gas for a few seconds then it's ok.

Not sure if the two are tied but any feedback on one or both questions would be appreciated.

 

Help! anybody?

 

Have you checked the airbox/filter for debris, dirt etc !
I noticed an improvement when i put a k&n air filter in my 5th gen :thumbsup:

 

air filter was clean. The bike only had 2000 km on it when this started. I spoke to a mechanic at the honda dealer yesterday. He said it's the ambient air temperature sensor that is giving a false reading and causing the bike to bypass fast idle. Apparently, it is common (based on other pms I've received, I would agree). It doesn't affect anything so I won't worry. Just seemed odd.

I put a K&N in and that helped with the surging somewhat.

Mike

 

The cold engine fast idle is done by the "wax unit" which sits between the starter valves under the airbox and is easy to adjust. Its operation is governed by coolant temperature, not air temperature.

The surging is a common occurrance on these bikes, and is cured by a PC3 and 02 sensor eliminators.
There are plenty of posts on this subject.

 

i dont think ive seen my bike ever go into the fast idle since i bought it in january. never really noticed until i rode my friends R1 and had to wait for the fast idle to go down. weird...

 

Mine always idled at 2000 from when I bought it new, when stone cold, then as soon as the temperature gauge started to register, it would slow down to normal, which I think is normal behaviour.
When I disabled the PAIR system, the idle slowed right down,(dropped about 300rpm) and I had to increase it to bring it back to normal (1300 or so) and also the cold fast idle didnt work as well as before, so I just adjusted the wax unit.
Just a few clicks, less than 1/4 turn was all that was necessary.
Its very easy to do.
I dont think its good for a cold engine to idle too slow.

 

I have also disabled my pair, along with just about everything else. I thought that, that may have contributed to the lack of the fast idle... I need to look into adjusting the wax unit, because this is something that I am not too familiar with.

 

did you find anything on adjusting the wax unit?

 

Have a look on page 5-71 of the downloadable service manual, the wax unit is under the airbox between the starter valves.
There is a small nut, about 6mm A/F on the end of the plunger.
Turning this slightly clockwise is how to speed up the cold start idle.
About 1/4 turn is all that is needed