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ET: Engine (Twin) Gunson colortune

charles d cannon jr

Active Website User
VOC Member
My 48 HRD Rapide, built up from parts, has 67 miles on the rebuild and idles and runs a bit lumpy, but accelerates well. On the advice of another, I purchased a Gunson color tune to check the mixture at idle. My current set up is 32 mm Amal Mark 2 carbs, K and N conical filters, 106 needle jet, main jet 240, pilot 25, needle in third position and 3 1/2 slide. My pipes are a little blue. I warmed the bike up with a 12 mile ride and then inserted the colortune on the front cylinder running a fan on the engine. My mixture screw was about one and 1/2 turns out. The color flame was orange/yellow at idle, not unexpected because of the somewhat sooty plugs and lumpy running, but to my amazement, no amount of turning, in or out produced the desired blue color, supposedly representative of ideal air/fuel ratio using this tool. Any thoughts or comments will be appreciated. Thanks, Charles Cannon
 

CollingsBob

Well Known and Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

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charles d cannon jr

Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

Albervin

Well Known and Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

BigEd

Well Known and Active Website User
VOC Member
VOC Forum Moderator
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

charles d cannon jr

Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

charles d cannon jr

Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

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