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1960 Panhead Bobber
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36 Posts
Discussion Starter · #1 ·
Hi there guys,
I've just fitted a new SuperTrapp 2-1, 4" Supermeg system to my 2001 FXD.
I'm running a 95" engine with SE203 Cams and 42 Mikuni Carb.
I replaced my original SE Stage One pipes to put this system on and am wondering how best to set it up.
I started with 16 Discs, but after my first run the discs were coming out Black, indicating it was runnig too rich and I removed 4 discs. It didn't sound anything like as good as the SE pipes and I wasn't convinced about any conceivable increase in performance.
A guy from the U.S. (who is on my Club Website in the UK) then suggested that I go up to 18 discs with an open endcap - this was based on Dyno results in the workshop he works at in the USA. I did that this morning before going to work and it does sound and feel a lot better, but I still think it is running too rich - this indicates to me that the Carb setup needs looking at......
Anyone got any experience/advice on these systems?
 

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The real expert is ohiomotoxer and per his suggestions start with 10-12 with the open cap. I started mine at 10 with the open end cap. I just had mine tuned and now it's at 12 w/ the open cap. Sounds like the carb is way rich. Search back in this exhaust thread. Ohiomotoxer's posts should still be in here.
 

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I'm gonna powder his nose
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537 Posts
snowflake said:
Hi there guys,
I've just fitted a new SuperTrapp 2-1, 4" Supermeg system to my 2001 FXD.
I'm running a 95" engine with SE203 Cams and 42 Mikuni Carb.
I replaced my original SE Stage One pipes to put this system on and am wondering how best to set it up.
I started with 16 Discs, but after my first run the discs were coming out Black, indicating it was runnig too rich and I removed 4 discs. It didn't sound anything like as good as the SE pipes and I wasn't convinced about any conceivable increase in performance.
A guy from the U.S. (who is on my Club Website in the UK) then suggested that I go up to 18 discs with an open endcap - this was based on Dyno results in the workshop he works at in the USA. I did that this morning before going to work and it does sound and feel a lot better, but I still think it is running too rich - this indicates to me that the Carb setup needs looking at......
Anyone got any experience/advice on these systems?


You can change discs till your blue in the face, tune that HSR, see this HSR tuning link:
http://www.mikuni.com/pdf/hsr_tuningmanual_021003.pdf

Chuck in some new spark plugs AND spark plug wires and test away.

Once you are satisfied that things are running proper, try the 10~12 discs with the open end cap and see if that suits your riding style.

Cheers.

PS
I run the two HSR carb set up on my 80 cu in evo softail made by Rivera Primo, they were a pain in the arse to dial in, I have a spring, summer and fall jet setting, but I love them Mikunis.
 

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1960 Panhead Bobber
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36 Posts
Discussion Starter · #4 ·
Thanks for that guys.
The current setup (18 discs with open end) feels nice.
Pulls like a train (still pulling v hard at 98 mph) sounds good, but still running rich.
I will look at the Miki set up over the next few days and see what I can do. On top of that, I'm booking in with a local tuning specialist for them to have a look too.
Any further advice is of course welcome!
 
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