I'm going to be putting V&H Stright Shot HS pipes, a SE High Flow Cleaner, plus rejet for my 04 Heritage Classic. The dealer suggested also the Dyno kit. What exactly is the Dyno Kit, and if you are rejetting, is the Dyno nessasary? All I'm really looking for is a more "Harly Sound" then the stock pipes offer.

 

Im thinking you have a carb bike in that you are talking of a rejet kit. Dyno kit-sounds like a fancy term for the use of a dyno. The dyno isnt necessary, but it will give you a read out as to where your performance, torque/horsepower is on a scale. It will also allow the tech to get the most out of tuning your bike with these mods, that is if he actually uses the info, and spends the time doing so. Chances are he is going to put a jet kit in it, that is known to work with your mods, and charge you for using the dyno to recoupe some of the money they have invested in it. With your mods you should have plenty of sound, and you should feel better performance. Loud pipes have been attributed to shorter tire life in that your wrist may become heavy more often, this would be one of the draw-backs to changing pipes. Enjoy!!!!!!!!

 

Ain't there a CV modification called a dyno jet kit, or sumpin' like that?

 

Thanks for the info. I'll probably just stick to the pipes and air cleaner,with rejet. Don't need to give HD Dealers more money then they already suck outta us. Really looking forward to my bike sounding like It should

 

I should have read your post more carefully...
If the dealer is talking about a "dyno kit" then he's probably talking about a company that makes rejetting and slide kits. (Dyno Jet).

If he's talking about putting it on a "dyno" then he's looking use a machine to tune it.

Rick C.

 

I think the Dyno kit is the Dynojet slide mod kit. I think all it is is a different spring for the slide and a drill bit to drill out the hole slightly larger. They claim it improves throttle resonse. There is no reall improvemnet in horsepower or torque it just help the peak quicker. I've never geard anyone comment on it much one way or the other.

 

I agree with your thoughts on performance of the dyno jet (thunderslide) kit.
I just popped open my carb to find a kit installed, and I'm replacing most of it with a Yost Master Kit. Can't replace the slide though...unless I by a factory one...The thunderslide is composite.

My point is...I bought the Yost kit because I'm running too lean with Straight Shots and SE cleaner...I didn't know the carb had already been jetted! (bought it used)

Rick C.

 

That rings a bell now. I remember reading on some other boards about the slide mod kit. Some folks weren't too impressed as their gas mileage dropped off quite a bit, especially considering the almost nil in performance increase.

Here's one post:

roadghost
Member since 5-19-04
176 posts 11-23-04, 05:29 AM (EST)

1. "What's wrong with that?"
In response to message #0

The numbers sound about normal for a 95" build unless you have something else. Personally I like the CV and will probably put it back on next spring. Right now I have the HSR 42 and like it as well. I found the Mikuni a little twitchy on cable routing but other than that it works pretty smoothly. One thing I had done on my CV was I had the AF side bored to a full 40mm, It's only 36mm on the front and 40mm on the intake side behind the butterfly. I'm not sure that made much of an improvement. I never used a thunderslide but I did buy the dynojet kit, that was a total waste of money IMO.

Here's another:

Sick Puppy
Charter Member
1378 posts 11-03-04, 04:29 PM (EST)

"Dynojet kit in the trash...."

I've finally had it! Installed the kit in my CV carb when I had my Stage 1 done. Gas mileage went from 42 mpg to 32/33 mpg overnight. Mechanic said, "There's a price for performance." Well, put a stock needle jet, and a 185 fast/45 slow jet back in, and guess what....mpg on the way back from TX running 70 mph the whole way, and I got 40 mpg. Haven't noticed one bit of performance loss. So, I guess performance does come with a price...about $30 to return my carb to stock.

And another:

xusnatc
Member since 4-9-03
35 posts 09-02-04, 10:41 AM (EST)

1. "RE: Jet kits"
In response to message #0

Dont buy one. You will be very dissapointed with the MPG results. Yea, they work alright, they will richen up your bike as advertised, plus they are waaaaaaay to expensive.

Check out NightRider site for CV carb mods:

http://www.nightrider.com/

 

Yep. That was my experience. Dynajet is a prduct of Thunder Mfg. as I recall. They made a big deal out of the shape of their needle. My experience, when I had a carbed scooter, was lousy gas mileage and I passed on the slide kit. Anyway, to stop being my long winded self. LOL I put the stock needle back in and just left the larger jets. There was no dignificant change in performance that I could detect but my mileage came back to reality. When I told Thunder about it at their both in Laughlin, the guy who engineered it just threw up his hands and walked away. Wouldn't even talk to me. There's really no getting around rejetting when you put on intake and exhaust. Can't seem to make it rich enough consistently through the RPM range. But just going up a little in jet size keeps the air to fuel mixture right throughout the range. If I recall correctly, in the ideal world the ratios like 13.7:1. A dyno with a gas analyser will show you where your at.

Just like 'em to make a composite slide. That has a lot of gee whiz value. It may get you a couple hundredths of a second on the drag strip but totin' yer old lady and all her stuff for a trip.......

 

BTW, you buy just the larger jets for the intake and exhaust. Reuse the stock needle and not mess with anything else. Typically exhaust manufactureres will recomend a jet size for their pipes when used with a K&N type air filter. Any wrench worth his salt can set the carb very closely. If your a fanatic put it on a dyno. I set mine up and they turned the mixture screw less than a quarter of turn on the dyno. The wrench laughed and said he had to do something for his fee.