Yay!! Another jetting question

[blue05twin]

Did the search and came up with these numbers for a rejet.
Pilot 22
Mid 65
Mains 147-150
Mixture screw 3.5 turns out

K&N lunchbox, and wileyco exhaust and the only mods atm

Does those numbers sound right for the mods done to the bike?

Thanks for any input.

[BigTwin]

Sorry to barge in, but I was wondering the same thing about my jet choices of 147.5/67.5/20 and my mods are:

1) Bob B ignition advance
2) Vance and Hines Full Exhaust (V12029)
3) K&N Lunchbox Filter (RU-2970)

Does this sound reasonable for my 2001 GS?

Sorry about posting this in your thread blue05twin, but I didn't want to start a completely new thread with the same question.

THANKS, BigTwin

[blue05twin]

I forgot it's an 05
Thanks again

[tdan553527]

Both numbers look allright, it's a touchy game to play

[fat_sac]

I don't know the numbers, but I just bought a stage three from Dynojet for my 96. It's got teh k&n and v&h pipes. Does anyone know anything to say to me b4 I put it in? It should be here tuesday.

[The Buddha]

Yea cancel that order, and buy mikuni jets ... or I'll sell you the kit for $20 (will cost ya closer to 17 or so buying yourself)
Cool.
Srinath.

[fat_sac]

Yea cancel that order, and buy mikuni jets ... or I'll sell you the kit for $20 (will cost ya closer to 17 or so buying yourself)
Cool.
Srinath.

Aww shaZam!, are you serious? Why did I pay 85$ for a dynojet kit? It is supposed to come with jets, slides, and all kinds of stuff. If it's not worth it, let me know. I'd love to save some money.

:guns: Dynojet...

[Alphamazing]

Gah. I'm so sick of jetting questions... but I have one now. Figure I'll do the same thing these guys are, as well as throw in another question.

I'm jetting my '04 witha full Yosh pipe to 20/62.5/137.5 Sound good?

Also, Sudco no longer sells to non-businesses. Any other places online that sell jets for NOT an ass load of money? Might bump the main up to 140 and the mid main up to 65.

All help appreciated!

[fat_sac]

Man, I'm really lost here. The last shop that so called 'jetted my carbs' ...put 122's as the mains. Just reading some similar posts, I know this is BS. I am pretty sure the stage 3 i ordered from Dynojet is a 135 main. I see ppl on here talking about a 145 main. WTF am I doing? I don't know sh1t about carbs and I'm starting to lose my mind. What's a good racing setup that can take a lot of abuse and mkes a lot of grunt?

[mjm]

Man, I'm really lost here. The last shop that so called 'jetted my carbs' ...put 122's as the mains. Just reading some similar posts, I know this is BS. I am pretty sure the stage 3 i ordered from Dynojet is a 135 main. I see ppl on here talking about a 145 main. WTF am I doing? I don't know sh1t about carbs and I'm starting to lose my mind. What's a good racing setup that can take a lot of abuse and mkes a lot of grunt?

Jetkits that change the needle - most of them-get by with smaller main jets since the needle is allowing more gas to flow, and depending on the kit, the numbers are not the same as for Mikuni jets.  The 145 and 150 numbers are for Mikuni jets used with stock needles.  You might well see a kit needle jetted to 135 mikuni jets run just fine - and you might also see a kit that uses its own bizarre non-standard jets list the appropriate main as 122.  Also, depending on the year of your bike the stock main jets have been anywhere from 122.5 to 130 (I think that I saw that reported for a 2005)  My 2001 had somewhere around 127.5 stock - but I long ago replaced those with larger.

[brembo]

My stock 01 has recently had the carby rejetted and is running #115 main jets   AFR is about 12.5 going from the dyno graph. NFI what make the jets are.

[rritterson]

threadjack:

curiousity question. Why do you guys work so hard to ekk out 4-5% more power from your bikes? It doesn't seem like you'd really notice that much unless you're racing on a track, or always speeding up long straights. Plus, if all you want is more torque, swaping sprockets is a lot easier and much less guesswork.  :dunno:

[Alphamazing]

It's not necessarily about power. It's about drivability. Jetting smooths out the power band so that there aren't any abrupt power hits or flat spots followed by surges. It's about smooth USEABLE power.

[rritterson]

Is it really that much smoother? I haven't noticed my torque curve to be that abrupt. (Of course, there is a difference between 4000RPM and 8000, but it's not like a huge step between the two)

[xtalman]

You're also supposed to be able to warm the bike up faster when you re-jet.

[Alphamazing]

Jetting improves the power over the whole rev band if you do it right. It adds more low end torque, as well as more high end power. You said that sprocket changes would give you more torque, but it comes at the expense of top end, as well as speedometer misreadings.

[Toledo Jim]

as well as speedometer misreadings.

How could jetting the engine affect the speedometer which reads of the front wheel?

[The Buddha]

Ok So many questions -

Fat Sac - OK 89-00 Kit has been sold by DJ for $35 in the recent past. It includes (not slides - that will make that $35 price worth it) 4 sets of main jets - totally worthless ... needles and some fooked up drill and tap that are the worst idea ever conjured up. I jet with stock needles. You need pilots - not in the DJ kit, mains and washers. I also put in allen head screws for float bowl. So they have a bunch of confusing and useless parts for their extra $$ ... and they dont give you one of the vital parts - the one that has biggest effect on startup and warm ups. I started doing jetting on carbs (parts and labor and trouble shooting as well as some minor adjustments like synch etc $40) just to make the DJ not too attractive. Check with us before you do anyhting ... I know I do and even on non GS sheite ... You've seen various crap about Virago etc from me right ... cos most stuff is generic and people set me pointing in the right direction ...
Your second question 122 mains are right about the stock size. if they used DJ's needles, and their 122 that means its more than likely its close enough for stage 1. DJ Kit 1 and 3 is in 1 box, and it has 118, 122, 128 and 134. Those work OK (IN theory cos I never run it and never did O2 sensor on it) because DJ needles are severely thin and tapered. The needle drops into the emulsion tube, make it thinner and you're effectively making the tube flow more, the mains are the other restriction in that tube, make it bigger and it flows more ... DJ has done 1/2 on needle side and 1/2 on the main. I do it all on the main. my jetting will work only with stock needle. DJ needles my jetting will be too rich.

MJM - OK I didn't read what you said till now so fat sac Its same as what mjm said.

Alphafire - I am working on a 01+ kit ... starting with WAP ... I have his carbs ... hope to get parts by next week and have him run it and let me know. Then I will train the local store monkeys to buy the right stuff for me when I call and we'll be good. Nothing like a local dealer who does exactly what we tell them ... usually that last part is where they totally let you down.

Brembo - OK no clue man. I am not up to speed on the 01 carbs yet, and 115 ... Yikes but I dont know.

Ritterson - yes its about having a bike that runs buttery smooth when its 25 degrees and when its a 100, its about starting your bike and running back into the house to finish putting your gear on and comming back to find one that has not only been running fine in the 3 mins, its also warm enough to hold perfect idle and ready to run. Its also having a bike that runs the same 2 mins into a ride as 2 hours in. It also is predictable in power delivery and in the 3K to 6K range it will actually sustain a load and accelerate even. The up high gain might be small but the rest of the range fits and starts and jerks should be gone.

Nsp - good point ... but OK lets say for fun he meant Tach vs speedo correlation ...
Cool.
Srinath.

[Alphamazing]

as well as speedometer misreadings.

How could jetting the engine affect the speedometer which reads of the front wheel?

That isn't what I said, nsp. I said SPROCKET changes affect speedometer readings. At least they do on the bikes I've done sprocket changes on.


Also, as previously asked: Where can I buy jets where I'm not paying $10 a piece? Do I have to call Sudco?

[fat_sac]

Sorry to come across as an idiot here, but can you put thogether a kit for me, or should I just ONLY worry about the mains? I've never tuned carbs b4, I always left it to my dad. He's not living near me now, so I have to learn my own stuff. I'm going to call him anyway, but I'd love to get advice [you] from someone that knows the bike. He knows engines, not this particular motor.

Ok So many questions -

Fat Sac - OK 89-00 Kit has been sold by DJ for $35 in the recent past. It includes (not slides - that will make that $35 price worth it) 4 sets of main jets - totally worthless ... needles and some fooked up drill and tap that are the worst idea ever conjured up. I jet with stock needles. You need pilots - not in the DJ kit, mains and washers. I also put in allen head screws for float bowl. So they have a bunch of confusing and useless parts for their extra $$ ... and they dont give you one of the vital parts - the one that has biggest effect on startup and warm ups. I started doing jetting on carbs (parts and labor and trouble shooting as well as some minor adjustments like synch etc $40) just to make the DJ not too attractive. Check with us before you do anyhting ... I know I do and even on non GS sheite ... You've seen various crap about Virago etc from me right ... cos most stuff is generic and people set me pointing in the right direction ...
Your second question 122 mains are right about the stock size. if they used DJ's needles, and their 122 that means its more than likely its close enough for stage 1. DJ Kit 1 and 3 is in 1 box, and it has 118, 122, 128 and 134. Those work OK (IN theory cos I never run it and never did O2 sensor on it) because DJ needles are severely thin and tapered. The needle drops into the emulsion tube, make it thinner and you're effectively making the tube flow more, the mains are the other restriction in that tube, make it bigger and it flows more ... DJ has done 1/2 on needle side and 1/2 on the main. I do it all on the main. my jetting will work only with stock needle. DJ needles my jetting will be too rich.

Srinath.