Keihin 34's on stock motor

[michigan_soler]

I have a stock motor with T5s on it, im getting a set of Keihin 34s because my stock carbs are junk and its time to start improving on the bike. The bike is ran only in sand dunes and about 5-10 times a year for a weekend each time.

 

 

can someone either help me figure out what needle and jets i need for this or point me in the direction of where to get this info?

[2001Stroker]

All stock motor with T-5's? IMO, you're gonna drown that motor with 34's. I would say 29's, tops. Maybe even 28's.

[BUILDER]

All stock motor with T-5's? IMO, you're gonna drown that motor with 34's. I would say 29's, tops. Maybe even 28's.

 

 

I agree with stroker unless you plan on porting that thig soon dont do with that big of a carb.

[jbooker82]

for pj's I would recomend

CEK needles

50-52 pilot

150-160 mains

 

If you havent bough the carbs yet then go with PWK's they are a much better carb.

 

josh

[1996dragshee]

for pj's I would recomend

CEK needles

50-52 pilot

150-160 mains

 

If you havent bough the carbs yet then go with PWK's they are a much better carb.

 

josh

 

 

thats alot of carb for his stock unported cylinders..personolly i would start with 45 pilots

[jbooker82]

That is what I ran with my PJ's with SST's and T5's on a mx ported cylinders. I did make the switch to PWK's and ended up at the 48-45 pilot. Seems like PJ's needed a larger pilot jet. Maybe because they are not as efficant at pulling fuel through the jet.

 

josh

[1996dragshee]

not sure about that but have to keep in mind he doesnt have an mx port or anything.he still wouldnt be drawing in as much fuel/air as you would with an mx port.50-52s would fall on its face out of the whole.

[Dick Wheels]

mine ported and at +8 timing the 34 pj's were just a tad to big. Could never get a smooth idle to 1/4 throttle. from 1/4 to wide open though they made some power. I would stay away from the pj's myself and go with 28's or 33's max.

 

I had cgj needles

[88bansheebitch]

word..them 34s are to big for an unported motor.

[dave5.0]

I've had the Pjs that Solar is talking about buying for atleast 3-4 years on a cleaned up stock port motor. I never had any idle problems or performance issues. Didn't notice much of any low end loss and gained some on the top. If anything I thought these carb were easier to tune than the stockers. It depends on who you talk to I guess. I've been told by some motor builders that 2 carbs of any size are too big for a stock motor and the best performance could be had from a single carb. That idea was supposed to be based on the fact that both cylinders don't suck fuel together they take turns. With a single it's a constant pull through the carb. That all sounded good in theory but I've blown the doors off every single carb bike I ever lined up against. Lots of fact, theory, and opinion behind all this. Just depends on what a guy wants to do.

[Chris-in-Cali]

I have some 34mm pj's with a cylinder intake port, a cool head with 20 cc domes and some v-force 3 reeds.

Dam..... I'm having some trouble getting them dialed in just right.

 

Can anyone offer some suggestions for jetting them for sea level at 90 degree+ weather.

 

Any replies will be much appreciated...thank you!!!

[Darthwall]

well for the stock motor I would at the most run 28's just run the stock carbs with T.O.R.S removed and jet them I have a set out in the shop that are suppostobe jetted for sea level with tors removed that are up for sale they have the ide screws and cable make an offer if you want it? and for my-dixie what kind of port job is on the cylinders what pipes are you running it will help out a bit

[jimbob]

i recently bought another shee with quite a few mods already done to it and it came with pwk 36's already on and ive had a few ppl say their way to big for the mods (mods are in my sig) but it starts first kick, idles perfect and goes like a stabbed rat right upto the limiter, ive not had to touch a thing on them since i bought it, although i have just rebuilt the top end as a precaution as i was getting a bit of piston noise, so it'll be even faster now

[Chris-in-Cali]

well for the stock motor I would at the most run 28's just run the stock carbs with T.O.R.S removed and jet them I have a set out in the shop that are suppostobe jetted for sea level with tors removed that are up for sale they have the ide screws and cable make an offer if you want it? and for my-dixie what kind of port job is on the cylinders what pipes are you running it will help out a bit

It's a drag port without the boost ports and some bill's pipes (they can be compared to paul turner mid ranges)..... I think where I am picking up drag is in the jetting of the 34's. That and the fact that I am not running 110 octane with 20cc domes. With 20cc domes is it mandatory to run 110 octane?

 

Advancing the timing +4 wouldn't hurt either

[flotek]

bigger carbs will work but you will get less response and your lowend torque will often be poor ,also the jetting them down to compensate will not help this loss of intake velocity ,sometimes bigger isnt better