Gunson Colortune Issues

Thanks for the PDF, that's the first time I've seen that and it was super helpful!

 

All of them looked like this, some came out with the screw, others I needed to pick out with a small hook.

do those look good or do I need to replace them? And what’s the next step: take carbs off and double check the idle jet passage?

 

If the tiny o-rings are not cracked and in otherwise good shape, they look good to me but I'm no expert.

 

They look a little pancaked, but they are still rubbery and not cracked or anything like that. Pretty sure they are less than 5 years old.
What's the best/easiest way to clean the idle jet passage? When I double checked the carbs (see previous posts/pics) I removed the jets and soaked everything in carb cleaner and it all looked good. There very well could be a blocked passage, but I don't know how to clean those internal passages besides what I already did.

@hogfiddles

 

Carb cleaner sprayed into the passage and then blown through with compressed air is one option. I think there are some tiny pipe cleaners that people have had luck with. Maybe something like this? https://www.amazon.com/Carburetor-Cleaner-Cleaning-Brushes-Small/dp/B075J7M7B4

 

I’d just replace the o-rings if there’s ANY question.....
Passages—Yup, lots of spray, and lots of compressed air. I typically use 2-3 cans per rack AFTER the dip. Then compressed air. I make sure that when I spray, I see a good amount of spray come out somewhere else. I spray through EVERY hole, regardless of whether spray came out of it already........spray in every hole, it better come out somewhere. Then the same thing with air. I have my air set at 100psi, and I use a pistol-style with a small tube, and also a rubber tip kind, to make sure I can get into every hole and have a seal so I can hear if air comes out some where or not..... air goes in EVERY hole, it better come out somewhere.

 

So I think I figured it out: the vacuum line caps have deteriorated so they no longer seal super well. The
“bubble” at the top of the tubes had actually formed a slight area that air could leak by so instead of pushing them all the way down I only pressed them halfway down and put the clamps right over that section instead of at the base of the vacuum tube. Two rides (each over an hour) and no high idle of any kind!

Note: this was after I’ve tried the starter fluid trick to find air leaks (twice) and I got no change in RPM. My guess is since the tube is so far up the rubber cap (and the leak was so small) that the fuel didn’t get siphoned up.

Thank you all for your help! I’m very glad to have my bike running like it should after so many years of tinkering.

 

Ahem......

 

For the record, they were on just non functioning

Anyone have a suggestion on a windscreen? I’m 6-1 so I need one that doesn’t just direct the wind into my helmet but don’t want one as tall as a sky scraper either

 

Spit Fire by slipstreamer