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Author Topic: CARB JETTING SHEET PROTOTYPE  (Read 3957 times)

Offline Mitch Keller

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CARB JETTING SHEET PROTOTYPE
« on: October 20, 2012, 05:13:10 pm »
Playing around to see if I can make a Carb Jetting Sheet / Ruff Draft


 

YEAR /MODEL
  87 LT500
 

 

MAKE/CARB
  KEIHIN PWK
 
 
 

SIZE
  41.5MM
 
 
 

SLIDE SIZE
  6
 
 
 

NEEDLE SIZE
  DJK
 
 
 

NEEDLE CLIP POSITION
  3RD
 
 
 

PILOT JET SIZE
  45
 
 
 

MAIN JET SIZE
  185
 
 
 

AIR SCREW TURNS
  1-1/2 OUT
 
 
 

ALTITUDE LEVEL
  300 FT
 
 
 


Copy and Past and Fill Out
 

YEAR /MODEL
 
 

 

MAKE/CARB
 
 
 
 

SIZE
 
 
 
 

SLIDE SIZE
 
 
 
 

NEEDLE SIZE
 
 
 
 

NEEDLE CLIP POSITION
 
 
 
 

PILOT JET SIZE
 
 
 
 

MAIN JET SIZE
 
 
 
 

AIR SCREW TURNS
 
 
 
 

ALTITUDE LEVEL
 
 
 
 
F Mitch Keller

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Offline Gillio

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #1 on: October 20, 2012, 06:37:18 pm »
YEAR /MODEL    
    
 92 LT250R
 285cc big bore

MAKE/CARB    
    
TM38

SIZE    
    
 42.5mm

SLIDE SIZE    
    
stock 87 500

NEEDLE SIZE    
    
 6dk3  needle
 R-2 needle jet
NEEDLE CLIP POSITION    
    
5th from top

PILOT JET SIZE    
    
25

MAIN JET SIZE    
    
 470 going to start going fatter for the cold weather

AIR SCREW TURNS    
    
 1.5

ALTITUDE LEVEL    
    
 near sea level
92 LT250R- Bartlett racing prototype big bore. Wide, Low,  and studded

91 LT250R Mickey Thompson stadium racer

87 LT500R- Mostly stock

89 LT500R IceZilla, mods TBA

Offline Stpltn250r

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #2 on: October 20, 2012, 07:53:55 pm »
year/model
88 Liger

cc
684.9cc

carb
CrankShop

size
54mm

slide
only one available

needle
only one available set at richest

pilot
no. 2 pencil lead size

main jet
1/8 drill bit + 2 power jets

air screw
not applicable

alt
sea level

fuel
methanol + 20% nitro with 50hp shot. lol >:D

est hp
155 :o


the last two are a joke

Offline Mitch Keller

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #3 on: October 21, 2012, 10:23:13 am »
OK this is how we can do this, see if it works for you I attached a Word Doc, Open it and copy and paste it in Reply and fill out,  once that is done the site will modify it, I think this could help out alot members could really use this for seasonal riding, new locations etc.
Let me know how it works here in testing. Also let me know if any other info should be added like location and temp. I don't think any other site has tried to do this?
I will set up a section under Tech Talk Jetting and sub forum LT500, LT250, and LTZ400 etc.
   
YEAR /MODEL
1234
 
MAKE/CARB
1234
 
SIZE
1234
 
SLIDE SIZE
1234
 
NEEDLE SIZE
1234
 
NEEDLE CLIP POSITION
1234
 
PILOT JET SIZE
1234
 
MAIN JET SIZE
1234
 
AIR SCREW TURNS
1234
 
ALTITUDE LEVEL
1234
 
   
F Mitch Keller

Offline Stpltn250r

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #4 on: October 21, 2012, 04:28:50 pm »
there was a thread on the other site

Offline Mitch Keller

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #5 on: October 21, 2012, 04:56:12 pm »
there was a thread on the other site
What other site? did have a form?
F Mitch Keller

Offline El Diablo

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #6 on: October 21, 2012, 05:27:22 pm »
there was a thread on the other site
What other site? did have a form?

The old QHQ had a thread started with a similar format.
Brian
1988 Suzuki LT-250R (The HPR test mule)
1987 Suzuki LT-500R
1990 Suzuki LT-500R
1982 Honda ATC-185S
1982 Honda ATC-250R

Offline Mitch Keller

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #7 on: October 21, 2012, 05:38:46 pm »
Damn I never got to see it!
F Mitch Keller

Offline Rogue1970

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #8 on: October 21, 2012, 08:55:39 pm »
Well I copied several posts when I found them useful.  This is what I had saved:

Cylinder: Small reed
Porting: Unknown cleanup port
Bore: 87.5mm
Reeds: V2's
Pipe: Paul Turner
Fuel/oil: Sunoco 110/927 @ 32:1
Air Filter: Stock airbox w/lid and 6 Uni vents, Uni foam filter
Carb: oem Mikuni bored to 41.5
Needle: Stock 6DK3, clip 4th position from top
Main: 460
Pilot: 30
Altitude: 1000'

Cylinder: Big reed
Porting: HRD
Bore: 88mm
Reeds: V2's
Pipe: Q Special
Fuel/oil: Sunoco 110/927 @ 24:1
Air Filter: amsoil
Carb: oem Mikuni bored to 42mm
Needle: Stock 6DK3, clip middle position
Main: 440
Pilot: 35
Altitude: 0 to 1000

Cylinder: big reed
Porting: Unknown, but it runs like something is done
Bore: 86mm
Reeds: V2's
Pipe: Q pipe
Fuel/oil: Sunoco 110/927 @ 24:1
Air Filter: Stock airbox and K&N
Carb: oem Mikuni bored to 42mm
Needle: Stock 6DK3, clip middle
Main: 400
Pilot: 30
Altitude: 0 - 1000'

Cylinder: Small reed
Porting: T&N "drag" port
Bore: all the way
Reeds: V2's
Pipe: Shearer/Q OOf pipe
Fuel/oil: VP M1 methanol / 927 @ 24:1
Air Filter: 6" K&N with 3 1/2 velocity tube
Carb: Lectron (Packard) 44 bored to 45mm
Needle: PE1 with spooned out tip. Just a hair rich.
Bowl: CP dual inlet bowl
Pump: Mikuni 65lph dual outlet
Powerjet: 1/2-3/4 turned out from shut off
Altitude: Sea level

Cylinder: Small reed
Porting: Tudors Dune Port
Bore: 86.5mm
Reeds: V2's
Pipe: Modded Q Pipe (starts pulling @ 3k rpm)
Fuel/oil: Sunoco 104/927 @ 32:1
Air Filter: Open top aluminum airbox with trx250r 6" Uni Foam filter
Carb: oem Mikuni bored to 42mm
Needle: Stock 6DK3, clip @ top position
Main: 440
Pilot: 35
Altitude: 800'




Before burn down this is what I was running:

Cylinder: Small reed
Porting: HRD
Bore: 87mm
Reeds: V2's
Pipe: HPR#19
Fuel/oil: F&L 111/Dominator @ 40:1
Air Filter: Open intake with 4"x6" Uni Dualy Layer Foam filter & Outerwear
Carb: TM38 Mikuni bored to 41mm
Needle: Stock 6DK3, clip @ 3rd position (Middle)
Main: 600
Pilot: 27.5 / 1 turn out
Altitude: 0-1000'


After my rebuild (next couple days), I'll be starting with the following:

Cylinder: Small reed / resleeved
Porting: HRD/HPR blended
Bore: 86mm
Reeds: V2's
Pipe: HPR#19
Fuel/oil: F&L 111/Dominator @ 40:1
Air Filter: Open intake with 4"x6" Uni Dualy Layer Foam filter & Outerwear
Carb: TM38 Mikuni bored to 41mm
Needle: Stock 6DK3, clip @ 2rd position (richer)
Main: 700
Pilot: 30 / 1.5 turns out
Altitude: 0-1000'


Offline LT500Kid

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #9 on: November 22, 2012, 06:56:32 am »
That first post by mitch is my zilla spot on

Offline Nekrofilliak

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #10 on: November 22, 2012, 07:32:47 am »
very good idea , add fuel type row ...
88 Lt250r.
79 Lawnboy 21" ;-P

Offline MotorGeek - Jerry Hall

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #11 on: November 22, 2012, 09:50:44 am »
OK this is how we can do this, see if it works for you I attached a Word Doc, Open it and copy and paste it in Reply and fill out,  once that is done the site will modify it, I think this could help out alot members could really use this for seasonal riding, new locations etc.
Let me know how it works here in testing. Also let me know if any other info should be added like location and temp. I don't think any other site has tried to do this?
I will set up a section under Tech Talk Jetting and sub forum LT500, LT250, and LTZ400 etc.
   
YEAR /MODEL
1234
 
MAKE/CARB
1234
 
SIZE
1234
 
SLIDE SIZE
1234
 
NEEDLE SIZE
1234
 
NEEDLE CLIP POSITION
1234
 
PILOT JET SIZE
1234
 
MAIN JET SIZE
1234
 
AIR SCREW TURNS
1234
 
ALTITUDE LEVEL
1234
 
   


You are leaving out 4 other important specifications.  The needle jet size, air correction jet, needle seat size (float valve seat), float level,  and the approximate temperature and humidity of the baseline jetting.


During the summer, areas that have very high humidity, the humidity by itself can easily require the reduction of 1 increment in jet size.  With all other atmospheric variables held the same, a change in carburetor inlet temperature of about 15 degrees F. will require changing the main jet one increment in size.

Offline GrkGuy

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #12 on: December 08, 2012, 10:40:25 pm »
ok my is just a basic jetting post.



Cylinder: large reed
Porting: Piranha Pete's version of a 540HRD
Bore: 88mm
Reeds: V2's
Pipe: Q special edt
Fuel/oil: Sunoco 110/927 @ 24:1
Air Filter: K&N
Carb: oem Mikuni bored to 42
Needle: middle
Main: 440
Pilot: 35
Altitude: 0 to 1500

this is for temps from 70 to 80 deg

90 LT 250R
Cylinder: Small reed
Porting: stock
Bore: 68mm
Reeds: V3's
Pipe: Q pipe
Fuel/oil: Sunoco 110/927 @ 32:1
Air Filter: Uni foam filter pod
Carb: air striker 40mm
Needle: middle
Main: 180
Pilot: 45
Altitude:  0 to 1500







life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Iceracer

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #13 on: December 09, 2012, 06:45:27 am »
Cylinder: small reed
Porting: Bartlett TT/Dune 
Bore: 88mm
 Reeds:V2's
Pipe: SHEARER 1.1 THERE IS NO Q V1.1 IT WAS DONE DURING THE GREAT ONES ABSENCE (fyi)
 Fuel/oil: c-12/927 @ 24:1
Air Filter: K&N winter / foam summer
Carb: oem Mikuni bored to 42.5
 Needle: 6dk3 where ever its happy from middle to top
Main: 530-550/480-500
 Pilot: 35/32.5
Altitude: 350-1250
this is for temps from 70 to 80 deg

Offline Mitch Keller

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #14 on: January 18, 2013, 11:14:52 am »
Please keep the topic to Jetting Specs
Thank you
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Offline Quadracer250r

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #15 on: February 10, 2013, 10:14:46 am »
could you do one for a 36mm carb
lt250r bored .60, fmfpipe, boyseen radvalve, durablue axle, lonestar swingarm, ebc clutch, wiseco high compression piston, uni daul stage air filter, 36mm flatside mikuni carb

Offline GrkGuy

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #16 on: February 10, 2013, 10:59:26 am »
there should be a thread for the 250 on here.
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Showcase1186

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #17 on: May 01, 2013, 11:22:23 am »
This is great.  Shoulda done this years ago...  Agreed with Grk, 250 needs to be done.  Maybe this weekend I'll pull mine out and check the PWK.  Been so long I forgot.

Offline Rainman56

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Re: CARB JETTING SHEET PROTOTYPE
« Reply #18 on: March 05, 2016, 08:34:45 am »
Was doing a search for some starting points on jetting and came across this thread.Interesting so thought I,d revive it.
Can,t fix stupid.:)

 

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