CV carb question
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Road Warrior
Joined: Aug 2016
Posts: 1,570
Likes: 599
From: Minneapolis, MN
I don’t believe there’s a manifold air leak but I’ll recheck. Am I understanding correctly that turning in the mixture screw leans the mixture while turning it out richens it? If I can’t get it to stumble turning it all the way in, isn’t the idle jet too big?
Stellar HDF Member
Joined: Feb 2013
Posts: 3,072
Likes: 1,727
From: Dallas, Texas
Yep, lean is in. How's yer MPG? Low? Might wanna check out the enrichener valve, it might be sticking. I had a similar problem with my old 96 Wideglide. After tearing apart the CV-40 and rebuilding it that's what I found. So never used the "choke" after that. Set mix at 2 1/2 turns out. Test Ride. Decel popping, turn out (richer) 1/4 turn at a time till it's back to "normal."
Thread Starter
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Road Warrior
Joined: Aug 2016
Posts: 1,570
Likes: 599
From: Minneapolis, MN
Yep, lean is in. How's yer MPG? Low? Might wanna check out the enrichener valve, it might be sticking. I had a similar problem with my old 96 Wideglide. After tearing apart the CV-40 and rebuilding it that's what I found. So never used the "choke" after that. Set mix at 2 1/2 turns out. Test Ride. Decel popping, turn out (richer) 1/4 turn at a time till it's back to "normal."
Stellar HDF Member
Joined: Feb 2013
Posts: 3,072
Likes: 1,727
From: Dallas, Texas
A side note on the CV-40. I converted EFI to CV-40 on my 07 Dyna 70,000 miles ago. Could never get great performance out of it after many tweekings. When I hit 100,000 I treated it to a 105" kit (after checking crank run-out.) Now it should have been great but it really wasn't. Did some research and found it's got limits based on CID. Swapped CV-40 for a Mikuni HSR 42. After dialing it in, I now have an Inter Continental Ballistic Dyna Missile. Still get 42/46 mpg . . . IF I stay with a light throttle.
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