Dynojet stage 1 or 3?

[KA1J]

XJ11 and I'm finished cleaning the carbs. I've just ordered the dynojet kit and am thinking stage 1 would be the best to start out with, the reason being Dynojet says there may be some driveability issues with stage 3 at lower RPMs & lower MPG with stage 3.

Any thoughts from the collective?

Thanks

[natemoen]

Unless your doing significant engine changes the stage 1 should be adequate.

[tinman905]

It depends on your set up , exhaust , pod filter or stock air box. I would be surprised if you needed the #138 jet in the Dyno kit even with my set up I only needed a #132 main jet.

If your bike is stock than for sure start with the stage 1 of the Dyno Kit #124 and see how everything is. The important thing is to make sure your carb floats are set properly and your mixture setting is right on as that will have a greater affect how your bike will run.

On my other SG I had the Mac turn outs and #124 main was perfect for that set up but by just changing to a "Spaghetti exhaust " I needed to go up to a #128 main and 4 1/2 turns out on my mixture screws ,a half turn more than what Dyno Jet recommends.So changes in exhaust or filter can affect what stage you will use.

[Jamie]

Unless your doing significant engine changes the stage 1 should be adequate.

Changes eh? What about Wiseco 1196 kit, pods and stock exhaust?

[natemoen]

Changes eh? What about Wiseco 1196 kit, pods and stock exhaust?

Yup that would qualify

[KA1J]

I'm sorry, I should have mentioned the bike came with a 4-1 exhaust, I don't know which kind. I have pods to put on it & have removed the airbox.

I don't plan on any other changes to it engine wise other than regular maintenance (got to check the shims next)

Thanks

[KA1J]

I'm still conflicted & am still interested in input; It's time to come to a final decision on what to do with my carbs. I'm still debating what is the "best" thing for me to do at this point with my XJ1100.

I removed the airbox & have removed all jets and had the carb bank bathed in a ultrasound. I have received the Dynojet kit for this version of the BS34 carbs and have Mikes XS K&N clone pods and now's the time for the big decision...

Here's the thing, I really don't like making permanent modifications to hard to find parts and to put the dynojets in, I will have to do drilling which can not be undone or at least undone easily. Since the bike came with the unbranded 4-1 exhaust and the bike is running really lean, I have to do something. It was such a bugger removing the carbs because of the cramped spaces between the boots and airbox that I really don't want to try and put the carbs back in with the boots & airbox in there. Oh, I am sure I can mod a K&N filter onto the old air filter but again, it was a bugger to get those carbs out with the airbox in & to have to keep on removing & replacing the carbs to rejet with that airbox & boots... ugh...

At the same time I am concerned that moding the carbs with the dynojet kit may end up where the bike is either still running lean or is running too rich & I really don't want to waste gas with a daily rider.

So this is the conflict I'm trying to resolve. The next issue will be replacing the rubber brake lines with SS braided lines but this carb issue is what's my immediate concern.

[petejw]

hi KA1J,

have you got the dyno jet kit for an xs or for an
xj specifically, im not sure what the differences are in the carbs,
but the xs and xj use different size main/pilot jets,

heres a link from the uk site showing the jet sizes for
various different models

http://www.benefiscal.co.uk/forum/index.php?topic=501.0

if u bought the dj kit for an xs it might not work the way it should
on the xj carbs.


if you want to run the pods, u could always jump the mains up
a cpl of sizes, make sure the float levels are correct, adj the
mixture screws and u should be good to go.

[natemoen]

If you don't want to drill (i know what you mean, I probably wouldn't want to either) just rejet with mikuni jets. Plenty, intact most people stay with mikuni jets and get their xs/xj tuned in just right. But as with most worthwhile things sometimes it takes some time and you might and most likely will end up pulling the carbs several times to get it right.

[tinman905]

I have Dyno Jet kits in both my XS100'S and never regret drilling the slides out. I do remember hesitating when I first drilled the slides but the difference was well worth it.
I have the 128 jets in with my "Spaghetti" exhaust with pods with 4 1/4 turns out on the idle screws.
On my BDF special I have 132 jets with pods and a 4 into 1 with 3 3/4 turns out on the idle screws. Both these set up's were verified on a Dyno machine to be "spot on"

Drilling out your slides is no big deal there are lots of parts for these carbs and carbs available .If you are like most of us here you will probably have a second set some day for a spare. If you decide you do not like the kit you will have no problem getting your money back selling the carbs or the kit with your slides.

With your set up I would try the #128 jets first and have a look at your plugs . The kit recommends setting the idle screws at 4 turns out that is just a starting point and you will need to find your "sweet spot" more or less.

[crazy steve]

...Here's the thing, I really don't like making permanent modifications to hard to find parts and to put the dynojets in, I will have to do drilling which can not be undone or at least undone easily...

That's the catch with the Dynojet kit. My understanding is the drilling of the slides has to do with throttle response rather than jetting, so you might try not drilling the slides (and retaining the stock slide springs) and see if the bike runs right with just the jets/needles. FWIW, I know people who drilled the slides with a DJ kit and weren't happy with the results but after replacing the slides ($$!) continued to use the DJ jetting. The main improvement the DJ kit offers you is an adjustable needle which the stock XJ lacks.

Drilling the slides gives you quicker throttle response for a 'perceived' power increase but don't actually increase power per se, it just seems like it.