performance suggestions please

[Lazy]

I have a 2000 model tour, have installed cobra 6inta6 exhaust, and desmogged (can't think of anything that matters here). Gonna take the carbs off anyway to clean etc...
Now to my question -
What changes need to be made to the carbs for best performance?

Oh yea, new (stock) air filter, and interstate control module. AND would you do trigger wheel change (if so which deg?) or ect mod?

Thanks in advance for your help!

[John Schmidt]

No changes necessary on the carbs for most applications. Some riders will increase the main jet size but I've neve found the need. I did replace the slow jets with #38(stock is #35), no real performance change, it just helps prevent clogging from this lousy ethanol fuel. If you already have the I/S ICM and want to install a trigger wheel, then don't go any higher than the 4 deg. trigger. That's mainly due to the I/S ICM already having a 2 deg. advance built in.

[saab9k]

No changes necessary on the carbs for most applications. Some riders will increase the main jet size but I've neve found the need. I did replace the slow jets with #38(stock is #35), no real performance change, it just helps prevent clogging from this lousy ethanol fuel. If you already have the I/S ICM and want to install a trigger wheel, then don't go any higher than the 4 deg. trigger. That's mainly due to the I/S ICM already having a 2 deg. advance built in.
[/quote

Thanks, for info.

[R J]

Get ahold of Attic Rat in Oklahoma.

Let him tweek the big Phat Girl.

He is good and gets some terrific output.

If ya don't want to go that route, get a Blower and install it.

I'll guarantee ya some get on it, hang on performance.

Search him out on the members panel, he is on page 13 I think it was.
Then you can send him an email.

He is in Tulsa, OK.

[Attic Rat]

Thanks RJ for the kind words.

[Lazy]

Your thoughts on ect mod vs 4deg trigger wheel please???
Beautiful bike you have there John. If and when I grow up maybe I will learn how to post photo here.

No changes necessary on the carbs for most applications. Some riders will increase the main jet size but I've neve found the need. I did replace the slow jets with #38(stock is #35), no real performance change, it just helps prevent clogging from this lousy ethanol fuel. If you already have the I/S ICM and want to install a trigger wheel, then don't go any higher than the 4 deg. trigger. That's mainly due to the I/S ICM already having a 2 deg. advance built in.

[Lazy]

Get ahold of Attic Rat in Oklahoma.

Let him tweek the big Phat Girl.

He is good and gets some terrific output.

If ya don't want to go that route, get a Blower and install it.

I'll guarantee ya some get on it, hang on performance.

Search him out on the members panel, he is on page 13 I think it was.
Then you can send him an email.

He is in Tulsa, OK.

just sent him email. thanks.

[R J]

Your thoughts on ect mod vs 4deg trigger wheel please???
Beautiful bike you have there John. If and when I grow up maybe I will learn how to post photo here.

No changes necessary on the carbs for most applications. Some riders will increase the main jet size but I've neve found the need. I did replace the slow jets with #38(stock is #35), no real performance change, it just helps prevent clogging from this lousy ethanol fuel. If you already have the I/S ICM and want to install a trigger wheel, then don't go any higher than the 4 deg. trigger. That's mainly due to the I/S ICM already having a 2 deg. advance built in.

This is only  my opinion.   Stay away from ICM mode, I had 2 go bad and we went back to stock on both of them.

1 is a Tourer, and it has a 6* trigger wheel.     The other one was a I-S and we put a 4* in it.

Again, this is only my opinion.   Get rid of those damn 6X6 pipes, get a good set of MarkT's pipes.     He has several models.    Talk to Mark, tell him what ya want and he will suggest a good set of pipes for ya.

Yes, I know a bunch of you people have 6X6 and swear by them.    Just trust me, you lose several ponies when ya put them on.

Mine, I have done a little head work, ported and polished some items, have a set of Viking pipes, you won't find them new, just used ones are available right now.   Last I heard JeffK in Florida was trying to scare up enough people for one of the previous owners I think it was said he'd run another batch.   Might try JeffK and see what the status is.

[hubcapsc]

I think the Cobra pipes are costing 5-8 horsepower...

MarkT pipes (and some others) have sound and gain in horsepower...

I wish I lived near the atticrat guy, I don't think there's much bolt-on
Valkyrie horsepower out there, skill and knowledge is about the only way...

-Mike

[Jess from VA]

What about the Interstate carb springs?

Used to be for sale on HDL (cheap).... they've changed the website and I can no longer find anything.

[Lazy]

Regarding the Cobra 6inta6 power loss, I certainly believe it. I replaced the completely stock exhaust with them and felt immediate power loss, thought there might be something with carb jetting or whatever to bring that back.
Will be giving them a call about Mark T ang get the exhaust issue resolved. Also wandering about the carb springs that Jess referred to.

Thanks for all the response, keep it coming if you have other thoughts. 

[Ricky-D]

Most all add-ons increase power, some things increase power dramatically. Yeah, If you believe all the hype.

Trying to ferret out the true case (does it help or not) is practically impossible due to human weakness.



To say something increased power without the necessary back up like a dyno run (before & after readout) ought

to be viewed with great skepticism.

***

[9Ball]

Regarding the Cobra 6inta6 power loss, I certainly believe it. I replaced the completely stock exhaust with them and felt immediate power loss, thought there might be something with carb jetting or whatever to bring that back.
Will be giving them a call about Mark T ang get the exhaust issue resolved. Also wandering about the carb springs that Jess referred to.

Thanks for all the response, keep it coming if you have other thoughts.  

I had my bike dyno'd stock when it was brand new (delivered 1/17/2000) and it was 90 hp...at Denver altitude in January.  After Cobras were installed at the dealer (same day), the bike was dyno'd again and hp dropped to 83.  Installed the Factory Pro jet kit with 105 mains and got the hp back to 90.

Based on my experience, proper re-jetting is well worth it with the Cobra pipes, especially at altitude.  Riding from Denver back to sea level and the bike has noticeable more get up and go.

[Jess from VA]

Here you go. (clicking each pic gets a blowup)

http://www.rattlebars.com/mtz/shims.html



http://www.hondadirectline.com/OEMpartfinder.htm?&referrer=http%253a%252f%252fwww.hondadirectlineofshadyside.com%252fstores%252findex.asp%253fstr%253d2#/s/HOM//16050-MBY-671/1

[Alien]

I run the I/S ICT and carb springs, 4 degree trigger wheel, K&N filter and homemade 4 inch truck stacks.  My bike runs great (although I am saving my pennies to have Attic Rat do his magic on the heads).  Everyone here has their favorite combinbation.  About the only thing we all agree on is not screwing with the airbox.

Ride Safe,

Alien

[quirkyguy001]

DITTO on Atticrat. Got mine done a month ago and still  surprised every time I go for a  ride. He makes everything more efficient which equates to POWER and better mpg. From opening the airbox all the way through the engine. Best 2K I ever spent on a bike If you have the time he shows you everything he does and why. He even got rid of the rattle from my Ultimate seat

[Lazy]

Getting carb springs ordered, (thanks Jess) and talked with Mark T today, haven't decided exactly what I am going to want him to do. Since I have the carbs off ANYWAY, should they be modified in any way, re-jet....whatever???    I don't know, just askin.

I am not trying to do alot of work for nothing, just want to do the best I can while I am in here.  Saving dimes to maybe see attic rat later.

Thanks for the input, love this forum!

[98valk]

http://www.valkyrieforum.com/bbs/index.php/topic,8248.0.html

see my post about jetting for the cobras as done by Marc at factory pro and my post of airbox mod that works.

[Ricky-D]

If determined to jet for power, the best set-up

going is the Dial a Jet System.

It is hands above any other "jet for power"

ideas that yield questionable results at best.

***

[Westsider]

performance suggestions please


The best one is while your out on the open road , twist the throttle (open) until you have reached the performance level you like. You can reset it to any level, anytime. happy new year!!