Carbs, Jet Kits, and Pipes

[Red Ballz]

Hi everybody,

I purchased a new to me 2003 Valkyrie with 81,000 miles back in July. I've gone through a dozen sport bikes over the years, but as soon as I rode this thing, I knew I had to own it. So now, I've got a small stable coming up with three bikes in it. Since buying it, I've put a few thousand miles on it and ride it almost everyday.

The only issue I'm having with it is that oil is leaking from around a few of the intake runners. Thanks to this forum, I found that it is likely caused by the o-rings failing. So they've been ordered, I've got the service manual, and I can't wait to tear it apart. I'll probably strip apart the carbs in the process and give them a good cleaning.

Of course, I'm getting the itch to modify it. For starters, it needs some auxiliary lighting for night riding. I also want to change the pipes over to Cobra 6 into 6 pipes. Though, I am still considering the Delkevic system. Additionally, a desmog kit will be needed with whatever system I go with.

Now, where I'm a little lost is on what jet kit to go with and what experiences people have had with them. Cobra offers a kit that includes new needles and springs, but I believe, no jets. There's also the option of 6sigma. I've also read quite a bit about the Factory Pro kits, but still can't find out exactly what all is in it.

So I would like to hear people's opinions and experiences with the various carb jet kits.

And again, Hi everybody!

[sandy]

The carb O rings are a #123 size and Viton or silicone will last forever. The OEM O rings are bune N and won't last.

 The 6 into 6 pipes will lose HP and get on your nerves after a while.

[Red Ballz]

Yes. I know what o-rings are required and have already ordered them. Timing belts as well because it’s a 15 year old machine coming up quickly on a hundred thousand miles.

I don’t think you understood what I meant by my stating that I’d like to hear opinions and experiences with the various carb jet kits that are offered. Thank you taking the time to state your opinion regarding the exhaust. It was most constructive. Have a blessed day.

[gordonv]

Sorry I have no experience yet with carbs, can't offer anything other than buy from known manufacturers, so you get quality. I might not be remembering right, but I thought someone said their jets corroded away.

Search might find you more info, since not too many replies yet.

Welcome to the board.

[DarkSideR]

Red Ballz,

I can help you out with your lighting.

I manufacture and sell and an Adapter Bracket that allows you to seamlessly install and LED DayMaker headlight into our beloved Valkyries. 

Here's my FB page - www.facebook.com/DayMakerBrackets/
And here's my installation video to give you an idea of how easy the install is - www.youtube.com/watch?v=K48cp45_h6Q&t=282s

Email me ValkyrieJosh@gmail.com with your shipping address for a quote if you are interested.

[knockdolian]

I had an interstate and put cobra 6 to 6 on. No jetting required. Like having been said. Got on my nerves after 3-4 hour ride. I sold the bike with them on. I now have a tourer which came with two Brothers 6 to 6 exhaust. The first thing I did was fit the stock Interstate exhaust I had. Again no jetting required. Runs fine. Much more comfortable.

[Roidfingers]

The carb O rings are a #123 size and Viton or silicone will last forever. The OEM O rings are bune N and won't last.

 The 6 into 6 pipes will lose HP and get on your nerves after a while.

Everyone has there own opinion. Love my 6x6, no baffles. No jetting required, just adjust air/fuel mixture.

[dago mooserider]

Hey redbz,

My suggestion.....don't touch it, maybe change the oil. Then start saving your pennies and send it to attic rat in Tulsa. He can make your vallk faster, get better gas mileage and do those maintenance items you mentioned all at once.  Some of the best money I've ever spent. I had a gsxr750 for awhile along with my valk and ended up selling it because I never rode it anymore after I got it back from attic rat.

[Bagger John - #3785]

The physics principles which dictate scavenging efficiency of a given exhaust system design are fairly immutable...and the dyno doesn't lie.

If you want power at one spot in the engine's PRM range...fit a set of drag pipes and tune the power peak by adjusting their length.

If you want increased power everywhere, you must maximize scavenging throughout the entire RPM range. A collector style exhaust of high volumetric characteristics is the way to go here. SuperTrapp, the Two Bros 6x2 canisters (not their drag pipes)...Viking...several others of this style. MarkT's crossover is another way to improve the characteristics of the stock exhaust system, should one wish to retain it.

Any exhaust which doesn't require re-jetting means you aren't putting any more fuel through the motor. More fuel and more air = more power. Simple physics at work.

[98valk]

The physics principles which dictate scavenging efficiency of a given exhaust system design are fairly immutable...and the dyno doesn't lie.

If you want power at one spot in the engine's PRM range...fit a set of drag pipes and tune the power peak by adjusting their length.

If you want increased power everywhere, you must maximize scavenging throughout the entire RPM range. A collector style exhaust of high volumetric characteristics is the way to go here. SuperTrapp, the Two Bros 6x2 canisters (not their drag pipes)...Viking...several others of this style. MarkT's crossover is another way to improve the characteristics of the stock exhaust system, should one wish to retain it.

Any exhaust which doesn't require re-jetting means you aren't putting any more fuel through the motor. More fuel and more air = more power. Simple physics at work.

agreed with everything, except about the cross-over. much written that for a six cylinder engine a cross-over really doesn't work unless the headers with the cross-over are designed and tuned together.  cross-over always lowers db.  one such article pro/cons https://mustangforums.com/forum/2005-2014-mustangs/96138-cross-over-exhaust-pipe-explained.html

[Red Ballz]

 Does anybody have any experience with the various jet kits or is this just going to be a circle jerk?

[98valk]

Does anybody have any experience with the various jet kits or is this just going to be a circle jerk?

Factorypro kit

[Bagger John - #3785]

I have a Dynojet Stage 1 kit in my '01 I/S (needles only; OEM I/S carb springs were retained) and #38 pilot jets.

In the '99 Tourer (which originally had a set of Cobra 6x6 pipes installed, and now has the stock exhaust), one finds the Cobra kit. That is, needles and springs - but the pilot jets aren't the stock #35s. Maybe these came in the kit....maybe they didn't.

The range from 1700-4000RPM is now fattened up sufficiently that the bikes will get out of their own way when throttle is applied (thank you very much, EPA).

Jet needles in both brands are adjustable, although the tapers differ between them. I run the clips in the 2nd notch from the top in either case.

[9Ball]

Does anybody have any experience with the various jet kits or is this just going to be a circle jerk?

Factorypro kit

Get the Factory Pro brand jet kit.  Mine came with needles, slows, and mains.  Went with 102 mains and 38 slows for Cobra 6x6 pipes.  Needles “e” clip put at second notch from the top.

[dago mooserider]

U guys are so helpful.....I was hoping for the circle jerk

[JimC]

Does anybody have any experience with the various jet kits or is this just going to be a circle jerk?

Trying to win friends and influence people with your 3rd post?

Jim

[Red Ballz]

Been a while, and I finally got the work done, so I thought I'd post an update.

I absolutely love the Cobra pipes. I've left the baffles in, and it isn't as loud as my xsr900 with a Leo Vince GP pipe and no baffles, but it sounds amazing. I love pulling up to 911's all the more. I went with the factory pro kit and am thoroughly impressed with the results. I'll stick it on a dyno at some point to see just how the fueling looks, but for now, I'm happy. The intake o-rings have been replaced which really smoothed out the idle and now I'm not constantly wiping oil off the head. I also purchased a digisync and it might just be one of my favorite tools now. It made balancing the carbs such a simple process. When I had the carbs off, I went ahead and disabled the PAIR valve, but haven't removed it.

So yeah, the results of all this has really made me enjoy the bike that much more. Though I will say that after having spent a solid eight hours straight doing all of this Wednesday makes me really appreciate fuel injection all the more. It was fun though. I mean, you do all that work, and then have the bike start on the first push of the button. There's something satisfying in that.

Next, will be installing smog delete plates and some auxiliary lighting. I might go ahead and do the headlight mod while I'm at it so I can stick some high wattage bulbs in there. Oh, and a denali soundbomb.

[98valk]

Been a while, and I finally got the work done, so I thought I'd post an update.

I absolutely love the Cobra pipes. I've left the baffles in, and it isn't as loud as my xsr900 with a Leo Vince GP pipe and no baffles, but it sounds amazing. I love pulling up to 911's all the more. I went with the factory pro kit and am thoroughly impressed with the results. I'll stick it on a dyno at some point to see just how the fueling looks, but for now, I'm happy. The intake o-rings have been replaced which really smoothed out the idle and now I'm not constantly wiping oil off the head. I also purchased a digisync and it might just be one of my favorite tools now. It made balancing the carbs such a simple process. When I had the carbs off, I went ahead and disabled the PAIR valve, but haven't removed it.

So yeah, the results of all this has really made me enjoy the bike that much more. Though I will say that after having spent a solid eight hours straight doing all of this Wednesday makes me really appreciate fuel injection all the more. It was fun though. I mean, you do all that work, and then have the bike start on the first push of the button. There's something satisfying in that.

Next, will be installing smog delete plates and some auxiliary lighting. I might go ahead and do the headlight mod while I'm at it so I can stick some high wattage bulbs in there. Oh, and a denali soundbomb.

 

just install the https://www.cyclopsadventuresports.com/ LED bulb

https://advrider.com/f/threads/led-headlight-bulb-replacement-modules.948701/