Configuration:
Bike / Rider - 06 klx 250/ Trey
Elevation - sea level to 10,000 ft. (live on Maui)
Date - 9/15/06

Intake:
Airbox - OEM
Filter - OEM

Exhaust:
Head Pipe - OEM
Muffler - drilled out 1/2" first baffle (going to big gun soon)

Drive Train:
Front - OEM
Rear - 47 tooth w/xring chain (110 link)

Carb Settings:
Pilot Jet - OEM
Main Jet - OEM
Needle - OEM
Needle Setting - OEM
Fuel/Air Mixture - 2 1/2 turns out
Slide Mod - not yet
Performace: getting better
Lean/Rich - Slightly Lean
Low End - Fair
Mid Range - Good
High End - Fair
Starting - Excellent
Idle - spot on
Acceleration - fair
Deceleration - slight popping

Additional Mods:
Crank Case -
Smog - (Yes, No)
Cylinder -
Fuel System -
Ignition -

Other:
Comments - 47 tooth or other gearing is a MUST. Next is big gun and dyno jet kit. Hopefully that'll get the front end up.

 

Went to the jetting and mods post, but don't have excel on my computer. So I will post them here. Full muzzy exhaust, dual snorkle,( fmf dyno kit- stock pilot- 124 main- 2.25 out on mix screw- 4th down on clip), uni filter. At about 500 ft elevation. Pulls hard through all gears, minor decel pop, Also drilled airbox vent to 3/8". plug looks good so far. Had to add the second snorkle (stock) the other is the high flow, was running too rich. The bike seems to be healthy now. 14/45 sprockets. Also installed dual star led tail light bulb, renthal bars, scott grips, d.i.d. chain.

 

Great idea Mike..I'll be sure to use this thread as a reference when evaluating what mods to do as I begin to tinker. Thank you.

 

Bike / Rider - Taran (FiveOMaster)
Elevation - 6,200
Date - 10/3/06

Intake:
Airbox - lid off
Filter - K&N

Exhaust:
Head Pipe - OEM
Muffler - OEM w/ 1/2" in first baffle and 3 3/16 in second baffle.

Drive Train:
Front - 13
Rear - 47

Carb Settings:
Pilot Jet - 35
Main Jet - 122
Needle - N1TC
Needle Setting - 2nd from top
Fuel/Air Mixture - 2
Slide Mod - 7/64

Performace:
Lean/Rich - Slightly Lean,
Low End - Good
Mid Range - Good
High End - Fair
Starting - not bad, 30 seconds of choke when cold
Idle - good
Acceleration - good till about 8500 then it falls off
Deceleration - slight popping

Additional Mods:
Crank Case - 3/8
Smog - removed
Cylinder - OEM
Fuel System - OEM
Ignition - OEM

Other:
Comments - I just put a 125 main in but I haven't had a chance to test it out yet. I'll post here when I do, and also the 13/47 is great for offroad which is just about all I do since I'm only 14.

 

Configuration:
Bike / Rider - IchWarrior
Elevation - 6,000 ft - 7,000ft average
Date - 11/8/06 (After extensive drive testing complete)

Intake:
Airbox - KDX 200 Snorkel
Filter - Stock

Exhaust:
Head Pipe - Stock
Muffler - HMF SLip on, No quiet Core

Drive Train:
Front - Stock
Rear - Stock

Carb Settings:
Pilot Jet - 40
Main Jet - 125
Needle - Stock
Needle Setting - Shimmed .030
Fuel/Air Mixture - 2 turns out
Slide Mod - None

Performace:
Lean/Rich - Have yet to check the plug, its safely in the rich
Low End - Good, no sutters pulls hard
Mid Range - Excellent pulls hard, sounds great
High End - Good
Starting - Easy, down to 30*
Idle - Good, slow to drop after the engine revs
Acceleration - Good
Deceleration - Pops, throws a fire ball

Additional Mods:None


Other:
Comments - The simple mods really changed the bike. It runs hard, cuts hard and sounds awesome. I will probably focus more on the aesthetic mods now, the engine is producing plenty of power to have fun, and lets bike handle like it should.

 

Configuration:
Bike / Rider -
Elevation - Sea Level
Date - 11-08-06

Intake:
Airbox - No lid
Filter - stock

Exhaust:
Head Pipe - Big gun
Muffler - Big gun

Drive Train:
Front - 13
Rear - 42

Carb Settings:
Pilot Jet - stock
Main Jet - 140
Needle - stock
Needle Setting - raised 1.22mm
Fuel/Air Mixture - 3 turns out
Slide Mod - drilled and 1" cut off diafragm return spring

Performace:
Starting - one touch
Idle - perfect
Acceleration - awesome
Deceleration - slight pop

Additional Mods:
Crank Case - yes
Smog - (Yes, No) yes
Cylinder - stock
Fuel System - stock
Ignition - stock

Other:
Comments - try the big jet you will like it but no lid on the airbox please. Plug looks fine

 

Configuration:
Bike / Rider - klx250s mostly stock, few mods.
Elevation - 5000ish to 9000ish
Date - 11/8/2006

Intake:
Airbox - drilled cover, stock snorkel
Filter - uni

Exhaust:
Head Pipe - stock
Muffler - 1/2 inch drill job on stock

Drive Train:
Front - stock, soon to be 13
Rear - stock

Carb Settings:
Pilot Jet - stock
Main Jet - 125
Needle - N1TC
Needle Setting - 2nd slot
Fuel/Air Mixture - 2.5 turns out total
Slide Mod - drill 7/64th

Performace:
Lean/Rich - (Slightly Rich, pulled plug had black deposits on it)
Low End - (Good)
Mid Range - (Good+)
High End - (Good+)
Starting - starts fine, choke for maybe minute, runs great
Idle - idles fine, around 1500 rpm
Acceleration - great
Deceleration - fine, no popping

Additional Mods:
Crank Case - drilled breather
Smog - (Yes, No) removed
Cylinder - oem
Fuel System - oem
Ignition - oem

Other:
Comments - bike runs great, considering trying to lean it a bit, but might go with highflow exhaust (saving coin), which could also solve slightly rich condition - or move needle up to slot 1?

 

Configuration:
Bike / Rider – A16tony @ 190lbs
Elevation – 0-4000ft
Date – 11/8/2006

Intake:
Airbox – hiflow summer/ snorkel removed winter
Filter – K&N

Exhaust: 'f-ing loud
Head Pipe -
Muffler – Muzzy full system Q/S

Drive Train: 108 chain
Front – 14
Rear - 48

Carb Settings:
Pilot Jet - 35
Main Jet – 128 summer/130 winter
Needle - stock
Needle Setting - raised, .050in (1.29mm N1TC collar)
Fuel/Air Mixture – 2-1/2
Slide Mod - #30 drill, cut out 1/4" of spring

Performace:
Lean/Rich – varies with weather. Richer/summer
Low End – mild 3-5k
Mid Range – very strong 5-7500
High End – great to 9000k in 6th gear
Starting – choke 15 seconds
Idle – smooth 1300rpm
Acceleration – snappy and very smooth
Deceleration - quick and poppy

Additional Mods:
Crank Case – 3/8 at air box
Smog – installed dummy plate for reed valve, left the rest on for the stock look
Cylinder - stock
Fuel System - Acerbis 3.7gal
Ignition - stock

Other: Mobile One for bikes.

 

I've updated the spreadsheet.

For those of you out there who do not have Micro$oft Excel, I've also added a link to an Acrobat (PDF) version of the spreadsheet printout. The PDF version does not provide access to the comments that have been added to some cells, but its better than not having access to anything at all, right?

With the changing season, a couple people have provided "Winter" configurations and performance ratings. This information has been mostly added in the cell comments.

If anyone has suggestions for a better layout, please let me know. There's a lot of information in there, and I've tried to capture it as consistently and concisely as possible, but there's always room for improvement!

Mike

 

Configuration:
Bike / Rider - 2006 KLX250s Modified by Ted Robinson (rider)
Elevation - Sea level to 3,000 Ft.
Date - 10-10-2006

Intake:
Airbox - KDX200 snorkel (part # 14073-1577)
Filter - UNI

Exhaust:
Head Pipe - Big Gun Exhaust System
Muffler - Big Gun With ;
Vortex Quiet Insert
USFS Approved Spark Arrestor ( A Screen )

Drive Train:
Front - 14 (OEM)
Rear - 42 (OEM)

Carb Settings:
Pilot Jet - 38
Main Jet - 135
Needle - N1TC
Needle Setting - 2nd slot down
Fuel/Air Mixture - 1 5/8 out
Slide Mod - I enlarge the hole in the slide to 7/64ths

Performance:
Lean/Rich - Perfect
Low End - Excellent
Mid Range - Excellent
High End - Excellent
Starting - choke off after 30 seconds
Idle - 1300 RPM
Acceleration - Excellent,
- Pops a wheelie in to second
- Goes right to the rev limiter in the first three gears
- Tops out at about 81 ( GPS ) on the flat That about 89 on the (OEM) speedometer
Deceleration - Excellent slight popping

Additional Mods:
Crank Case - Drilled airbox hole to 1/2
Smog - No
- removed
- installed dummy plate for reed valve
- plugged air box line
- plugged carb vacuum line
Cylinder - 300 CC
Fuel System - Acerbis gas tank 3.7 green
Ignition - OEM


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