MM to carb conversion early results
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Intermediate
Joined: May 2018
Posts: 42
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From: Aurora, IL
MM to carb conversion early results
I just buttoned up my 01 ultra conversion and just on my first shake down ride OMG what a difference! I cant wait to fine tune what I can and ride the **** out of my girl. I used a thunder heart stand alone on setting 5 with a CV40 with a 48 and 190 jet. The motor has a SE203 and free breather and pipes and I cant believe the power and manners this has. Again I havent even began to fine tune it. MM is definitely not a great fuel management system.
Seasoned HDF Member
Joined: Mar 2021
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From: backwoods
If you got time, listing some parts and costs, might help people. Years ago there were kits, not sure if they exists anymore. Also were a few threads on forums. As parts get scarce I suspect this conversion will be the best option for some. But it is a narrow band of people, so maybe not a lot of support.
Stellar HDF Member
Joined: Feb 2013
Posts: 3,072
Likes: 1,727
From: Dallas, Texas
Glad to hear ya like it! I did the EFI to carb conversion on my 07 Dyna 75,000 miles ago. Had crap mpg with the CV-40. Swapped it out for a Mikuni HSR 42. Turned it into a BEAST!!!! Instant throttle response and 50mpg (IF I'm easy on the throttle.)
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Intermediate
Joined: May 2018
Posts: 42
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From: Aurora, IL
UPDATE: Okay, so my original post must have been fueled by some beer and the fact that the bike started right up easily and had a bunch of power. After more than a ride around the block moment I took it and rode it for a bit and have some issues.
1) The turn signals don't self cancel anymore. Checked the white/green wire from the speedo and it isn't broken and is connected. This is a strange issue because the turn signal module doesn't use any data from the EFI system to function and yet here I am.
2) Cruise control won't engage. Need to check the throttle cable roll off switch but white/green wire from speedo is good to there as well.
3) Tach reading drops out randomly while cruising. Pink wire is good from tach to ignition box. I am guessing the cheap China made coil and wires that came with the Thunder Heart ignition is the cause for this for sure. I also think the coil could be causing the turn signal module to not act right.
4) The exhaust is 2-3 time louder than it ever was, very noticeable and not loud as in a leak. Also couldn't adjust the idle mixture screw because idle was choppy and it was making finding the sweet spot difficult.
I am starting to think the Thunder Heart Ignition kit is crap. I ordered a new NAMZ carb harness and a Daytona TC88 ignition module and will be putting my stock coil and wires back on. We will see how much of my issues disappear.
1) The turn signals don't self cancel anymore. Checked the white/green wire from the speedo and it isn't broken and is connected. This is a strange issue because the turn signal module doesn't use any data from the EFI system to function and yet here I am.
2) Cruise control won't engage. Need to check the throttle cable roll off switch but white/green wire from speedo is good to there as well.
3) Tach reading drops out randomly while cruising. Pink wire is good from tach to ignition box. I am guessing the cheap China made coil and wires that came with the Thunder Heart ignition is the cause for this for sure. I also think the coil could be causing the turn signal module to not act right.
4) The exhaust is 2-3 time louder than it ever was, very noticeable and not loud as in a leak. Also couldn't adjust the idle mixture screw because idle was choppy and it was making finding the sweet spot difficult.
I am starting to think the Thunder Heart Ignition kit is crap. I ordered a new NAMZ carb harness and a Daytona TC88 ignition module and will be putting my stock coil and wires back on. We will see how much of my issues disappear.
Stellar HDF Member
Joined: Feb 2013
Posts: 3,072
Likes: 1,727
From: Dallas, Texas
The Stand Alone Ignition is a RACE unit. No voes or maf sensor just pure straight advance & retard. Only issues with my 07 (Delphi) EFI to Mikuni conversion is I have blown every error code on it and engine light is on constantly. Disabled CE light in speedometer. Yer 01 is a completely different story. Personally, if it was my 01, I would have gone the NAMZ an TC88 route.
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