The line runs from the #4 (right rear) carb to a "T" up by the left upper frame rail. One end of the "T" hose goes to the ECU, the other to a plug, for testing. At least that's the way Honda built/sold it.
Terminology can be so confusing. It's the same as the computer, ECM, PCM Ignition control Module, brain etc. etc.:wink2: You have to take off the fake tank.OK going to try post 38 today. But I am not sure where the icu vacuum line is at. And what does icu stand for?
But is is NOT a vacuum leak, it is getting vacuum to the ICU when it should not be.That hose could have easily come unplugged from the carburetor without it being noticed. One little tug could do it. Or it could simply develop a leak somewhere, especially if it's the original hose.
Or the vacuum is trapped in the ICU and line. It could be the line is collapsed internally and acting like a check valve. I've seen it happen and I know you have too, Dave. Common on brake lines right where they crimp a bracket on. I would change the line and run it. Fingers crossed.But is is NOT a vacuum leak, it is getting vacuum to the ICU when it should not be.
After 51 posts you finally got around to answering #3. :doh2:Well after I got home from my trip l put on my new hand grips and now my throttle really closes fast. I can hear it snap down when testing it. With engine off. There was a lot if glue on the throttle body tube and on the end of it too. May of been the problem the whole time with my rpms. Just glad it works right the way it should again. And thanks to all of your help out there . Sincerely Roger H.
I can't tell you how many times I've seen the glue hang up between the throttle pipe and the handlebars. When someone would come into my shop I could immediately tell there was a problem. It's common but you said your throttle snapped back ok. I assume you knew how it was supposed to work... my mistake. This is a good 'take note' for most anyone that has bought a bike with non-stock grips or has changed the grips and they don't return like before or the throttle doesn't act properly.I thought I answered #3 post sorry about that. But I did check it when #3 was posted and it did return like it always did fast but never knew it was suppose to make a snap. So my bad. Lol and sorry about that but when I did replace the hand grips and got all the glue off the throttle body it does make a very noticeable snap now. And the RPMs do drop done like they should .
Curious how that had anything to do with 4th & 5th gear. Doesn't make sense.I thought I answered #3 post sorry about that. But I did check it when #3 was posted and it did return like it always did fast but never knew it was suppose to make a snap. So my bad. Lol and sorry about that but when I did replace the hand grips and got all the glue off the throttle body it does make a very noticeable snap now. And the RPMs do drop done like they should .
I wonder if it was not as noticeable in the lower gears because you really don't coast much in those gears with throttle applied. You seldom cruise or just roll out of the throttle in power gears. It is more like bang, bang, first to second etc. Wouldn't even know if the throttle hung just a bit???? . You might not be aware.Plus it is a sudden twist so it might not stick as much as when you roll gently out of the throttle in higher gears. I think you know what I mean.Curious how that had anything to do with 4th & 5th gear. Doesn't make sense.