Cv carb jetting question
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Cruiser
Joined: Apr 2006
Posts: 116
Likes: 3
From: pennsylvania
Cv carb jetting question
I have a 2000 tc springer..all stock..i just upgraded to a dragtron aircleaner with a k&n air filter and 2/14 drag pipes with torque cones...ive rejetted the carb from #45/#190 to #48/#200...responds great but i feel its still running lean...no black soot in the pipes yet..the air/fuel screw has been drilled out and adjusted as well...was thinking to go up on the main...any suggestions or thoughts?
Ultimate HDF Member
Joined: Jun 2007
Posts: 9,193
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From: Richmond, VA
It's an old bike, so think old school tech.
Get it out on the road and fully warmed up. Fourth gear, about 2500 rpm hammer it wide open. At various rpms ABOVE 4000 rpm "slightly let off the throttle". If the power increases as you gently roll off the throttle, your main jet is still too lean. If your still unsure, run it up to various rpm between 3-4K. Slam the throttle wide open. Does it accelerate smooth or does it want to slug until you get way up in the rpm range. If it does that, the main jets too rich.
Get it out on the road and fully warmed up. Fourth gear, about 2500 rpm hammer it wide open. At various rpms ABOVE 4000 rpm "slightly let off the throttle". If the power increases as you gently roll off the throttle, your main jet is still too lean. If your still unsure, run it up to various rpm between 3-4K. Slam the throttle wide open. Does it accelerate smooth or does it want to slug until you get way up in the rpm range. If it does that, the main jets too rich.
Road Master
Joined: Aug 2015
Posts: 768
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From: chico
when you changed jets did you verify float level? otherwise I agree with bikerlaw completely - but most of my experience has been with linkerts - those are adjustable while riding - but you look for the same things, smooth transitions, healthy go. obviously zero vacuum leaks is essential...
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Cruiser
Joined: Apr 2006
Posts: 116
Likes: 3
From: pennsylvania
Thanks guys i will pay attention to the throttle suggestion...i had it out on the highway and was doing that and didnt notice anything..but i will run it again...i did wack the throttle and and had immediate response..wasnt sluggish
Ultimate HDF Member
Joined: Jun 2007
Posts: 9,193
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From: Richmond, VA
Given this, it sounds pretty darn close. I was running the exact same 48/200 on my Evo and it was dead nuts with drags. But.... but, they were 40 inch 1 3/4 drags with fishtail extensions. I just don't know if your ever gonna get killer throttle response without a flat spot somewhere with the 2 1/4 drag pipes your running. Even with the torque cones. Those are just not optimum exhaust pipes street driven twin cam.
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Cruiser
Joined: Apr 2006
Posts: 116
Likes: 3
From: pennsylvania
The mixture is about 5 turns out now...no change in idle..doesnt run rough at all...youre saying i should go up from #48 pilot and leave the #200 main alone?
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Road Warrior
Joined: Sep 2006
Posts: 1,570
Likes: 45
Yes, I think your main is plenty rich. Bump up the pilot jet to a 48. What do he plugs look like? But if it's not pinging then I'd leave it alone.
Last edited by the blob; Apr 26, 2016 at 08:54 PM.
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Thread Starter
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Cruiser
Joined: Apr 2006
Posts: 116
Likes: 3
From: pennsylvania
I have a #48 in it now...ive tried adjusting the mixture screw...but it doesnt seem to change...it runs great..no back firing or pinging...just no black soot in the pipes..plugs are clean..no major white miscoloration..little i was told is normal due to todays fuel...thanks blob for youre response..anything further would be helpful too
Road Warrior
Joined: Sep 2006
Posts: 1,570
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No prob. This is the reason I really dig carbd Harleys.
I think your jetting should be pretty close, I can't imagine
You'd need any fatter jets. Run the bike for for a 1000 miles
Or so while paying attention to how it's running. After that
Check the plugs, they should start to show some tan pastel
Like color on the porcelain.
I think your jetting should be pretty close, I can't imagine
You'd need any fatter jets. Run the bike for for a 1000 miles
Or so while paying attention to how it's running. After that
Check the plugs, they should start to show some tan pastel
Like color on the porcelain.