Interstate ICM in Standard

[DarkSideR]

I did a quick search and didn't see any previous posts on this subject.

I've read that Interstates have a different ICM than Standards, to give the Interstate better low end grunt due to the extra weight.

Since any extra grunt would be nice would it then make sense to switch the Standards ICM with an Interstates? Maybe nobody has done this since the ICM is a $330 part.

Does anyone have any knowledge of this or links they can suggest?

[gordonv]

It's been done, and post here. I'm surprised you didn't find anything about it on a search.

A quick search found this.

http://www.valkyrieforum.com/bbs/index.php/topic,60544.0.html

[Momz]

I've done the I/S ICM swap into my 98 standard along with the I/S carb springs, and the simple ECT modification.

It will give your bike a bit more "SNAP".

In the words of Martha Stewart,...."it's a good thing".

[BonS]

There have been a lot of posts about the I/S ICM and springs. Do a search using "ICM" and "springs" and you'll get a boat-load of threads discussing changing out the ICM and carburetor slide springs from the I/S for extra giddy'up in the mid-range rpm's.

[Otus]

I got a used one on ebay for $130.00.  The code on the standard is "mzoa-a"  the code for the interstate is "mbyaa". You will see these codes in the pics.

[John Schmidt]

I have had one for most of the 11+ years I've owned my bike. With it, you don't want to use the 6 deg. trigger wheel. I've had the 4 deg. installed with the I/S ICM since I first got it and it gives you a total of 6 deg. in that setup. The ICM has an extra 2 deg. built in up to around 4500rpm as I recall, so the 4 deg. trigger wheel takes it up to six. For fuel I use at least midgrade most of the time, seems to run better and the plugs look good.

[big poppa pump]

Glad I came across this thread. Been wanting to do this mod for a while. Picked up an I/S ICM on fleabay for 90 bucks.

[Christbiker]

JoshC-K  I know 5-19 installed the I/S ICM on his Standard.  Might want to contact him for results and info.

Blessings,

Woody

[Challenger]

A lot of people have swapped I/S ICM's into their bikes, Most all have added I/S springs and trigger wheel. I swapped my stock I/S ICM into my stock STD with no other changes and could tell no difference at all. But with the other mods indicated could be an improvement.  YMMV

[wizard -vrccds#125]

I have them on both my 98's and 6 degree trigger wheels with interstate carb springs ! In one I have 112.5 jets and the other with 107.5 jets. Both run great and they have been that way for years

[MP]

A lot of people have swapped I/S ICM's into their bikes, Most all have added I/S springs and trigger wheel. I swapped my stock I/S ICM into my stock STD with no other changes and could tell no difference at all. But with the other mods indicated could be an improvement.  YMMV

About the same here.  I cannot tell much difference. I/S ICM in a 97 std.

MP

[Bagger John - #3785]

Here's my "special sauce". I've done this on every non-I/S Valkyrie I've owned over the years; all have retained the stock (unmodified) exhaust, air filter and trigger wheel:

1) Swap ICM for I/S part
2) Swap carb springs for I/S parts
3) Replace jet needles with Dynojet Stage 1 parts; e-clips initially set 2nd notch from top
4) Replace #35 (OEM) pilot jets with #38s (if and when carbs need to come off bike)
5) Set pilot air screw initial adjustment 1 1/2 turns out from lightly seated, then adjust mixture per service manual.

I've also done 3 through 5 on both I/S's I've owned.

In all cases, power was restored - especially throughout that annoying EPA-induced lean spot around 2500RPM.

Your mileage may vary, though. In the case of our current rides, Blondie's '99 CA-model Tourer averages darn near 40MPG with the changes - while my '01 49-state I/S sees anywhere from 31-36MPG. Both are noticeably more responsive up through 4K RPM than when in stock tune.