Jet Kit

[tealetm]

I've seen a few posts saying that people have fitted jet kits to their t300's. I'm interested in doing it to my 95 S3... but am having troubles finding the kit. Does anyone know where I can get one? (how much difference will jetting make... only other mods are a K&N filter due to a mouse nest in the original!)

[crashmasterd]

You don't need a kit, just go down to your local Honda/Yamaha/Suzuki/Kawasaki dealership and just buy the jets for $2 or so each. These numbers are for standard Mikuni jets- available everywhere. (Don't tell them what it's for before they have them in front of you. They'll probably tell you they won't fit. Trust me they will.) The Dynojet kit uses different numbers for essentially the same sizes.

The main jets should be 130 125 130 for top performance, although a couple of guys found that a configuration of 127.5 125 127.5 was a little less harsh and produced the same HP increase.

The pilot jet should be a 40 on all three carbs. (This should be stock)

The slide needle needs to be either in the 4th or 5th slot from the top. It seems somewhere in between is best, but would require shimming. It's also possible to buy new needles with a different taper. These appear to work well, but there is less information on them because few people do this. Probably not worth the effort of finding them.

Slide holes should be drilled from 0.8 to 2 mm. This seems like a lot to me, but comes recommended. It will increase throttle response. (Not 100% necessary)

Idle mixture screws turned out 2.5 turns. This is universal.

Change spark plugs to one hotter: NGK DPR8EA


This setup worked wonderfully on my 96 Trident, which has exactly the same engine as you S3.

Ride. Have fun. Watch out for cops.

[zippythehog]

tealetm,
What is that white goop on the filter?

crash, thanks for the info!

[tealetm]

zippy, that was the mousenest which somehow appeared within a week of not riding the bike this summer...

Thats some good information crash, thank a ton. Assuming I can find the correct jets, what kind of gains will I be looking at (stock pipes, K&N filter only)?

Maybe I'm just getting to antsy to ride again and should wait another season...

[crashmasterd]

I can't give you exact numbers because it's never been on a dyno. Some people have claimed 5 to 6 horsepower with the above setup, K&N, and a couple of good slip-on silencers. I'd guess that you'd net closer to 3 to 4 HP with slipons, and 2 to 3 HP with stock silencers. These are guesses only.

We are running Jardine universals on the Trident, with some hackneyed short tubes to make them fit. They look good, are fairly loud (about 96 or 98 db) and sound fantastic. The T300's sound better than any of the other triples with loud pipes (in my opinion). I think it has something to do with the 3 into 2 header, and possibly the combustion chamber design. Anyway, sounds cool!

Two things that seem like a good idea, but probably aren't:
1) Three pod filters instead of the factory airbox will add about 1 HP, but will put a huge hole in your midrange. Totally not worth it.
2) 3 into 1 header will also add maybe a HP or two, but will also screw up your mid range. Once again, not worth it.

Here's a good link with lots of good information. What you are looking for is about half way down the page. Unfortunately, there are a lot of wild claims as well. (110 HP at the rear wheel with just jets and intake work? I doubt it.)

Thunderbikes

We are in the midst of considering either a nitrous system, or a turbocharger. The turbo is the way we want to go, but the nitrous system will be cheaper and require less tuning. Wouldn't that be fun?

This will be a street/drag bike eventually.

Crashmasterd;
Thanks for posting your advice, it may be exactly what I'm looking for. Can you recommend / identify the slide needle and do you know if there should be a 1/8" spacer under the needle clip?

Thanks.

[seumas]

Does anybody know what effect altitude would have on the info above? I live at 4500 ft.

[trypcil]

The higher the altitude you ride, the richer the stock jetting will become - less air basically - the cure would be to drop the mains a size and perhaps lower the needle and tweak the fuel screws. However only do one change at a time, ie mains,ride,then needle if needed, then fuel screws. CV carbs compensate quite well for altitude normally, because of their nature and hence their widespread use but maybe 4500ft is enough to warrant a jet change if you ride at that altitude all the time. Look on line, I remember seeing a jet/altitude calculator - mikuni does one but they aren't cheap.

The Sebring 3.1 pipe will knock some of your midrange out but give you gains up top - the Yosh just gives you more across the board. The Stock 3.2 pipe with the crossover is a good torque getter but weighs in at about 30+lbs - changing the cans/header will save weight, which is horse power - if 1hp is gotten for every 6lbs - hence benefits of the 8lb 3-1 systems before jetting. But I totally agree with Crash' you can jiggle the performance with mikuni jets and save oodles buy not getting the $180 jet kit - incidentally Dynojet and factory have kits in various incarnations and which one works the best is unknown, whether they are available is questionable also - stay mikuni ! As to that 'shim', I seem to remember a little white dealio about the needle - whether it goes above or below the clip is a good question - someone may have the micro fish and look it up for you.

Typically what a jet change will do is give you 'driveability', crisper acceleration through throttle response and perhaps better mpg - though that can be disputed because she'll be noticeably more fun to ride. Stock, these bikes are in the low 90's as to HP, gains with k&n, slip-ons and jetting can give you maybe 4-8hp depending on the bike and how she was run in - getting any significant gains will need FCR carbs + full system - 110hp with that combo is easy but will cost you $2000, plus dyno time.

Just because you have a Million mile K&N filter doesn't mean you can forget it - it does require oiling! :razz:

[sailfish]

Is there anyone who can lay it out for the Keihin CVK36 like Crashmasterd did for the Mikuni?

Moto, is it a given that the Keihin air chambers will need to be rewelded? How delicate of an operation is that?

[YYZSKI]

I have a brand new FactoryPro jet kit available for sale - $60.

Bike is gone *sniff*