To Dynojet or Not To Dynojet

[MrOzz]

I have a chance to pick up a Dynojet kit for my ride. I found it at a local MC shop for under $80.00. I know they go for over $100.00

My question to you all is should I? Are they worth it? Looks like all your doing is changing some jets and have to drill out the carb slides? If I do put one in is can you go back to the stock jets with out any issues?


I look foward to your wisdom on this.

Ozz

[dbeardslee]

Looks like all your doing is changing some jets and have to drill out the carb slides?

Do you mean emulsion tubes? Can't imagine drilling the slides. I think you get the best results if you just properly jet your carbs. Mikes sells jets in pairs for $6, so you can get mains and pilots for $24 plus shipping. My $.02.

[XJOK2PLAY]

Ozz,

Next weekend I will be putting one in my XJ. 2 friends of mine have already done it to their bikes. They used to get the same mileage as mine...(32) Now they're getting around 42. To me, that alone is enough reason. Extended range and a mod that pays for itself in savings.

My carbs have a few other issues that I'm hoping it also solves.

I posted this question in another thread earlier last week and asked the guys who have had their XS's since new if they remembered what mileage they used to get when the bikes were new. Most said low 40's.

I've been told the jets wear from the needles sliding in & out for the last 30 years, and makes for a rich mixture when cruising, thus the drop in fuel economy.

If you can snag a kit for $80, DO IT! Mine's costing me $125

I will post as soon as I have results on mine.

I've heard a few "guru's" say they've worked with these carbs for years... experimenting & tweaking... but never could get them "perfect"... they finally tried a Dynojet, and had great things to say about it...

If your bike's carbs have issues, or the mileage isn't that great, I'd say go for it.

Dynojet's done their homework when it comes to their needles and jets from what I hear.

[Crazcnuk]

"Do you mean emulsion tubes? Can't imagine drilling the slides"

No, he means the little hole in the bottom of the slide. We haven't yet deteremined exactly what this does, but all the Dynojet kits do this.

I can't see it hurting, I beleive the instructions come with a a few oprions as to whether you want all out performance, economy or a mix.

But, as with all carb tuning, I think it would work a lot better if you had access to a dyno to properly test each change.

[GARTHXS]

slides

This allows the slides to lift faster forquiker transistion, also the needles have a more gradual taper

[tw1980]

I have the kits installed in mine.It gives you more adjustment options but also requires more adjustment.Don't expect a plug and play mod,you,re going to be playing with the adjustments for a while.But that being said I would have to say I ended up with better performance and economy.

Terry

[CatatonicBug]

From what I understand, the kits are ALWAYS a good idea. At $80, its a really good deal! Get it!! I plan to get just the needles and emulsion tubes from mikesxs next week, in the hopes of improving my mpg too. The set is $72, so I'll save a bit of money. If I could get a real dynajet kit for $80, I'd go that route instead.

[MrOzz]

Thanks all for your input. I have called the shop and they are going to put it aside for me so I can pick up this weekend.

Ozz

[MrOzz]

OK I got it. Installed it. Throttle response is much better. Can not wait to see what my mpg is going to be.

Thanks all for your input.

Ozz

[XJOK2PLAY]

Ozz,
What notch did you set your needles?

For mine, (mostly stock) I went with Stage 1, needles in second notch from top.

I am seeing the same thing about throttle response, (now that I'm getting some other kinks worked out...)

Ran 150 miles yesterday, mine went from 32 to 38 so far on the first tank...

I plan on running it this way for a little while, making sure it's consistent.

If so, I may drop the needles one notch, and see what happens.

Glad to hear you got it done. Pretty easy, right?

[MrOzz]

Ozz,
What notch did you set your needles?

For mine, (mostly stock) I went with Stage 1, needles in second notch from top.

I am seeing the same thing about throttle response, (now that I'm getting some other kinks worked out...)

Ran 150 miles yesterday, mine went from 32 to 38 so far on the first tank...

I plan on running it this way for a little while, making sure it's consistent.

If so, I may drop the needles one notch, and see what happens.

Glad to hear you got it done. Pretty easy, right?

I also went with the stage one. 2nd notch from the top.

Very easy to do.

[dragxs11]

Hey Ozz,
I ran the stage 1 for awhile. Ended up getting tired of getting 35mpg with no real power improvement here at 4800ft. Went back to stock with the diaphrams still drilled.
Our 80G has stock jetting with a kerker, and is a little lean(I think dangerous at sea level, but it usually runs around Lake Tahoe at 7000+). My 80sg is running a mac header and supertrapp and is about right.

[Ivan]

So, what do you find that usually helps when installing a Dyno Jet kit?

I just put one in and it really feels...THE SAME. No difference what so ever, other than it is a bit harder to start.

[XJOK2PLAY]

Ivan,

The biggest difference is adjustable needles... plus, the length and taper's a lot different, as well as different jet sizes.

So far, once Cody & I finally got mine tuned in, I've seen it get rid of the popping at idle, seems to have gotten rid of the intermittent stalling I was having, and I've so far seen a 6 mpg increase. I set mine up as stock, stage 1, second notch of the needles as per directions. I'm gonna run it this way for a while, then possibly drop the needles another notch and see what happens. Cody said Bohn ran it this way for a while, then dropped them a notch, and got over 42 mpg.

But, Bohn also has a lot of mods on his bike, too.

For me, just getting away from 32 will eventually be worth it. I wanted the extended range for trips. Plus, mine seems to pull a lot stronger to 8000 now.

What notch & setup did you go with?

[petejw]

Im running the DJ set up as well,
was wondering what youre all setting the mixture screws at?
The kit says 4 turns out, but that was way to rich for the bike,
im running it at 2 turns out.

Im also running the 128 main jet, pod filters/4-2-1 exhaust
needle set at 2nd clip
23mm float height