improve performance?

[natemoen]

from the re-jetting specs
MAINS
+3 for Kirker 4/1
+2 for air pods
= +5

110+5= 122.5

PILOTS
+1 for every 3 main
42.5+1= 45

twistin a handful with the pods on the 78 sounded like a deep growl. thats what i want to hear on the 81

There is a subtract 1 at the end of that formula as well so it would be an initial estimate of only 4 up.

[ddragon63]

You'll never take an XS Eleven and get it anywhere close to the modern day Sportbike numbers or performance. I was just looking at the 2012 Aprilia Tuono, 153.6 h.p. 77.1 lbs. tq. corrected at the rear wheel. Numbers...10.07 1/4 ET at 140.84 mph. and you can bet your life, new owners will be buying stuff to make them faster. And, of course it's not the fastest, quickest or most powerful. Ride the XS with the satisfaction that it's yours, more than likely paid for, and older than a hell of a lot of riders out there.

My 02 R1 factory rated HP is 152 and its a 436 lb bike. Bike is STUPID fast. I was looking for an R6 and came across this R1 and couldn't pass it up. the power being an injected bike is very streetable. But I can't roll into it like I use to do on my 748 Ducati SuperBike which was only 107 HP. The Ducati you can come out of the apex of the corner and just pin it. My R1 you try that and it will pick the front tire off the ground and send you off course.

I think any Mod someone wants to make on a XS they should be looking @ stuff that makes more torque. You can feel torque on the street. Unless your riding your bike balls to the wall all the time you'll never use the extra 4-10 HP you'll make with expensive mods. Plus too many mod's can make it unreliable. Good pipes and maybe an air box mod can give you a little more power with out making it a tuning nightmare.

Remember its more fun to ride @ bike @ 80-90 % of its potential than it is to have too much power and you can only use 50 % of it.

[mjpxs11sh]

jet size

thanks Nate. i dont think i noted that, but read it previously. now i know why i wrote down 120 mains.
thanks Greg, i was afraid the K&N kit might cause issues but wasnt sure. maybe thats just the K&L rebuild kit with the incorrectly drilled jet sizes. ur link didnt work but ive researched them before. i was just thinkin about putting Mikuni's in from Nichecycle.com
in reality, i think my issue is i cant seem to stop wanting to work on it while riding seasons not here yet, whatever it is. must be luv.

[BA80]

Sorry, don't know why that link didn't work.

TRY THIS ONE

[mjpxs11sh]

Greg

Greg, that site only lists a jet kit for 80's for some reason. ill find a DynoJet kit for an 81SH somewhere. ive seen them before for about $100. thanx for ur research. its appreciated!

[crazy steve]

The kits for the '80 carbs also fits the '81s; the only difference is jetting, which you'll be changing anyway....

[cywelchjr]

The kits for the '80 carbs also fits the '81s; the only difference is jetting, which you'll be changing anyway....

I'm not sure that's the case, as the bowls are different between the two. I think that at the very least the bowl gaskets would be different. The needle valve would be the same, and most of the rest of the parts are the same, but the bowl and related parts are different, and IIRC the edge of the bowls aren't even quite the same, and aren't interchangeable between the two either.

[crazy steve]

Cy, the 80-81 bowls will interchange, but they're different from the '78-79; you can't swap between the 'types'...

[cywelchjr]

Cy, the 80-81 bowls will interchange, but they're different from the '78-79; you can't swap between the 'types'...

Umm, I think you need to check again, the 80 and 81 bowls are quite different, even the internal size is different and the enrichment jet isn't even in the same place on both of them. The 80 has the drain bolt in the center just like the 78-9's and the 81 has the screw like the 82 (81 and 82 swap just fine though). IIRC someone tried to swap them and ran into trouble because the internal parts are in slightly different positions, as in addition SOME of the 80 carbs have the rubber plug and the 80 bowls have a protrusion on the inside of them to hold that plug in place. I think it was found that the 80 and 81 bowls will ALMOST swap, but the carbs won't work right if it's done.

[BA80]

Hmmm... I was just looking at kits the other day and according to MC Superstore 80 XS-82XJ take the same kit.

[crazy steve]

Umm, I think you need to check again, the 80 and 81 bowls are quite different, even the internal size is different...

I have swapped the '80 and 81 bowls.... they do interchange... Yes, they look different, but either will fit the '80-up bodies.

[cywelchjr]

I have swapped the '80 and 81 bowls.... they do interchange... Yes, they look different, but either will fit the '80-up bodies.

Ok, I stand corrected. I do know that the 81 bowls don't have the nub that hold the rubber plug in though so you CAN'T use the 81 bowls on the hybrid carbs. Maybe my confusion had to do with the 80 bowl LOOKING like the 78/79 bowls but not being interchangeable.

[cywelchjr]

Hmmm... I was just looking at kits the other day and according to MC Superstore 80 XS-82XJ take the same kit.

As long as you're not talking about the hybrid carbs, I guess that would be right, but the hybrid carbs require a plug the others don't. Unless they include it all the time which would be a waste of money most of the time.

[TopCatGr58]

in reality, i think my issue is i cant seem to stop wanting to work on it while riding seasons not here yet, whatever it is. must be luv.

Hey MJ,

If you'll look at the tech tips in the FORUMS sections, the MODS, Fuel & Carbs, you'll find photos and info on how you can adapt your pods to those carbs with just a few plumbing parts!

I didn't review this entire thread so I can't recall if I suggested getting some new aftermarket HI OUTPUT Dyna or Accel coils? They can help you get more bang out of the fuel. It's also been commented about how our fuel now has at least 10% alcohol which actually reduces power, so you might also play with some fuel additives or even try mid or premium grade! JAT!

T.C.