Playing around to see if I can make a Carb Jetting Sheet / Ruff Draft
YEAR /MODEL | 87 LT500
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MAKE/CARB | KEIHIN PWK
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SIZE | 41.5MM
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SLIDE SIZE | 6
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NEEDLE SIZE | DJK
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NEEDLE CLIP POSITION | 3RD
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PILOT JET SIZE | 45
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MAIN JET SIZE | 185
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AIR SCREW TURNS | 1-1/2 OUT
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ALTITUDE LEVEL | 300 FT
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Copy and Past and Fill Out
YEAR /MODEL |
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MAKE/CARB |
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SIZE |
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SLIDE SIZE |
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NEEDLE SIZE |
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NEEDLE CLIP POSITION |
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PILOT JET SIZE |
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MAIN JET SIZE |
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AIR SCREW TURNS |
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ALTITUDE LEVEL |
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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
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
est hp
155
the last two are a joke
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
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there was a thread on the other site
there was a thread on the other site
What other site? did have a form?
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.
Damn I never got to see it!
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'
That first post by mitch is my zilla spot on
very good idea , add fuel type row ...
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.
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
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
Please keep the topic to Jetting Specs
Thank you
could you do one for a 36mm carb
there should be a thread for the 250 on here.
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.
Was doing a search for some starting points on jetting and came across this thread.Interesting so thought I,d revive it.