What Keihin Needle

[JeremyKS]

I need to know what needle is best in a Keihin 38mm PWK carb on a ESR310 with a trx5 pipe.
Thanks for any help

[Langbolt]

I think ESR recommends a DGH for that setup.....Check their Website.....

:devil:

[steve250r]

This is from ESR's website......

38 and 39 Keihin PWK / Airstyker

250-265cc main 172-178
pilot 50
needle DGH 4th clip
air screw 2 turns out
310-330 main 172-178

pilot 50
needle DGH 4th clip
air screw 2 turns out

350-370 main 178-185
pilot 50
needle DGH 4th clip
air screw 2 turns out

[steve250r]

Nice Langbolt we posted at the same time!

[JeremyKS]

I saw their recommendation but I have also seen DEG and DEJ recommended on other posts. Anybody using them?

[Langbolt]

steve250r......What do they say...great minds think alike ?

Or jinx on you!!! LOL

:devil:

[Langbolt]

JeremyKS.....Are you running RACE fuel or Pump gas ?

I think the DEG or DEJ needles fine tune for race gas.

When I ran my 310 with a 39mm PJ on pump fuel I used a DGM (r1471-honda#) and it had a good idle and crisp throttle response........

The DGH is a bit richer...so try it and see....better safe (rich) than sorry (lean)

:devil:

[havinnoj]

344:
DEJ - middle clip. 178 & 52 on a 39pwk drinking C12. BR8 or 9ES gapped at 18.

[dunatic]

Originally posted by havinnoj
344:
DEJ - middle clip. 178 & 52 on a 39pwk drinking C12. BR8 or 9ES gapped at 18.

DITTO

[Buttermilk]

I have ran the DDJ needle on my setup with the ESR5 pipe.

[JeremyKS]

Thanks for the help guys. Where is the best place to order them?
Thanks
Jeremy

[8686]

Originally posted by havinnoj
344:
DEJ - middle clip. 178 & 52 on a 39pwk drinking C12. BR8 or 9ES gapped at 18.

What igntion are you running?

[4WHLr]

www.carbparts.com

[havinnoj]

Originally posted by 8686
What igntion are you running?

CR

Also guys stop saying "I run ............. on my setup."
We don't know what your setup is. List the relevant mods please. ;)

[8686]

Originally posted by havinnoj
CR

Also guys stop saying "I run ............. on my setup."
We don't know what your setup is. List the relevant mods please. ;)

You run the CR250 ignition and still gap it down to 18?

[dunatic]

Originally posted by JeremyKS
Thanks for the help guys. Where is the best place to order them?
Thanks
Jeremy

SUDCO

[havinnoj]

Originally posted by 8686
You run the CR250 ignition and still gap it down to 18?

Yup

[dunatic]

Originally posted by havinnoj
Yup

Yup....X2

[bluetrx]

im running a DCQ neddle to get a fuel map that looks like this.

[bluetrx]

if you have access to a dyno with an air fuel meter its much easier to get the exact needle you need. its still a little tricky, the dyno reads rpm not throttle position so you have to be carefull to roll the throttle smoothly when youre doing a pull for air fuel ratio. if you just pin it fron the start your whole graph will only show the results from your main jet. the attached image shows what the letters stand for and what their affect is on air fuel ratio at what throttle position.

[porscheguy944]

This Is Driving Me Nuts Help!!!!
1. I just bought my son a 1988 trx250r stock?
It has a 1986 stock cyl on a 1988 bottem end no porting done to it at all.
34mm kiehin carb PJ flat slide
foam filter cone type?
no lid on air box
psi pipe dont know what type lable is missing but it is large and section welded type w/psi silencer on the end the guys at psi say it is a mid type of pipe.
br8es plug
carb says PJ03AWYG on it
162 main jet (it had 152)runs like crap iether way
58 pilot (it had a 42)runs like crap iether way
needle is a NR1468 still in it and sudco says it should be a DGW?
air screw 3/4 turn out
needle in the 3rd position also tried 4th position no change
It had the stock reed cage and metal reeds
Now it has new boysen reeds and just added a reed spacer (I hope this stuff helps)
not the carbon fiber ones
I live at 960 FT in MN and today it was 60F
145 -148 psi comp W.O.T many kicks until no more rise in comp reading
can anyone help with the jetting for this thing?
does not stay ideling for long

revs right from idel though and then lean bogs????

then mid range picks up and clears out revs out

then gets to lower range of high rpm well and then runs out on top end again????
WTF ????

Can anybody tell me what this issue might be.
I have run the jetting it came with.
A).152 main
42 pilot
air screw out 3/4 turn
Needle nr1468 (stock?) 3rd position came with this jetting in the carb.
B.)162 main jet
52 pilot
nr1468 needle 3rd pos and then 4th position round two.
C.)
stock 1988 honda jetting
158 main
48 pilot
nr1468 needle 3rd pos round three

none of this had much effect and then changed to a br9ey plug then to a br8es plug nothing realy changed much same bog in the same places on the rpm range.
I PULLED THE CARB AND SOAKED IT OVER NIGHT IN CARB CLEANER AND THEN BLEW IT OUT WITH SHOP AIR AND STARTER FLUID IT IS ALL CLEANED AND THE JETS ARE ALL NEW!!!!
I ALSO CHECKED THE FLOAT AND IT DOES NOT HAVE ANY HOLES IT IT AND SEEMS TO BE SET CORRECTLY.
@@TELL ME HOW TO CHECK IT YOUR WAY AND I WILL SEE IF THAT IS THE ISSUE?@@
I THINK IT IS GOOD AS IS BUT MAYBE IM WRONG??

D.)I then put in new reeds from BOYSEN and then added a reed spacer after that still no real change???I am out of ideas?????

I checked for boot cracks/replaced reeds /replaced spark plug/checked for intake leaks with starter fluid and found none/tried another cdi but it was a bad cdi so no help there the second cdi would not even start the atv it must be a dead one?
I would like to get this set up to run right first then switch to the second set up when my son gets used to this power level.
<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>


But I would like to figure this out first.
THE STOCK CARB SETTINGS????
IS THE JETTING THAT FAR OFF????

can anyone tell me what the stator should read OHM'S RANGE
and where to do the readings
at which wires and what color they are
and what the readings should be
I think this is where I should be looking next as the jetting did not help?IDK

##################################################
###########
AFTER I GET THIS FIGURED OUT I WANT TO RUN THE SECOND SET UP AFTER HE GETS USED TO THAT POWER LEVEL.
HAVE A PSI PORTED 1988 CYLINDER STAGE VII WITH PAPER WORK .040 OVER SIZED PISTON
I WAS TOLD BY DUNCAN RACING THAT I SHOULD RUN A 38MM PWK OR PJ CARB WITH THIS ET UP.
SO I BOUGHT A 38MM PWK FLAT OVAL SLIDE CARB OFF OF EBAY IT HAS
175 MAIN JET IN IT AND A 60 PILOT NOT SURE ON THE NEEDLE YET ITS IN THE CARB CLEANER BUCKET NOW SOAKING OVER NIGHT.
SAME ENGINE 1986 BOTTEM END 38MM CARB PSI PIPE AND SILANCER AIR BOX NO LID
MN 960 FT TEMP AROUND 60F
WHAT SHOULD THE BASE LINE JETTING BE SET AT WITH THIS COMBO????
THANKS AGAIN GUYS FOR ANY HELP

http://s233.photobucket.com/albums/ee296/rhedstromii/1988%20TRX250R%20Rath/?albumview=slideshow

[Langbolt]

Here's a couple of questions:

Did you completey dissassemble the carb when you blew it all out with shop air ???

What fuel are you using ? Race Gas or Pump fuel....How old is it ?

What oil are you using and at what ratio ? 20:1, 32:1 , 50:1

Have you cleaned out the petcock that is attached to the gas
tank ? Is the screen clogged ?

Is your gas cap vent working (can you blow air through it....?)

try this:

152 Main
52 pilot
NR1468 (which is a DGJ)
try adjusting the air screw to give the highest idle & best throttle response (should be around 1-1/2 to 2-1/2 turns out) - less than 1-1/2 means you need a richer pilot more than 3 turns out means you need a leaner pilot

try that and get back to us with your findings ?

P.S. Next time...start a NEW THREAD....don't hijack an existing one.

[porscheguy944]

sorry I did not mean to hyjack this thread.I just thought since you were already talking about carbs and tuning them this would be the right place to post my questions.