- jetting an FCR
- Exhuasts
- Best 416 kit?
- FYI advantages of each pipe
- Carb help!!!
- Choke plate removal
- Best pipe In your opinion???
- 250EX exhaust
- Engine Mods ????
- Breather Tube
- Drilled Holes in Airbox:Need Help Please
- kill switch???
- Best WB price?
- quiet exhaust? with power upgrade
- Backfire
- Stock Silencer Mods
- K&N Jet Kit on 400
- rev kit
- Sound Levels?
- Aluminum Airbox
- Pipe/header for more top end on 300EX?
- need power fast!!
- a different pipe question
- My 440 sputters on low end
- 300 ex rev limiter
- main jet size
- 400ex governor?
- 300ex carb modification
- WB E-Series owners...question for you
- first mod
- Tachometer
- Shaved Flywheel
- GOLDEEN WEST CYCLE stage III
- Its time to put my motor back together
- FCR needle help
- lrd chrome pipe
- engine oil
- Please Please Help--advance Key?
- Please help 300ex sputters
- how do u remove the rev limiter on a 300ex
- xr400 head gasket
- clutch problem?
- E-Series Question
- 400 ex cylinder wall material?
- cylinder head bolts?
- Best Overall Modification to Motor
- Help Jetting a 400 EX?
- What Compression piston
- Jetting Sizes
- 330 kit for 300ex
- White Brothers Slip on Silencer
- Air Screw Location?
- Stock Bore JE Piston
- 416 stroker kit (440)
- octane question
- What to clean the engine/chassis with
- White Brothers or FMF????
- LRD 460 or Sparks 465!!!!!!!!!!!!!!!!!
- racing cam
- Colours of the spark plug???
- cams and valves
- Most H.p.!
- Airbox Lid???
- Dead motor in water.
- Oil leak around clutch shaft
- Burning oil
- taking the choke out
- rate the ids2
- lean jetting stock?
- Best 300ex Pipe
- K&N Filter and jet worth the $$$
- Changing jets on 300ex?
- Honda Utility Iwth A 4 Valve Head
- My K&N Precharger tore again
- White Bros. E-series Vrs Exhaust Mod
- E-Series Question Again
- I want more power
- Removing Air Box
- Ignition
- OuterWear over uni ?
- How is the T-4?
- Exhaust mod???????
- k&n
- K&N Filter Outerwear and Airbox Outerwear?
- Power up kit or dynojet??
- How good is the K&N filters??
- Help!!!!!
- Removeing Choke on a 400ex
- Carb Selection
- Vibration??
- What is the diff?
- How many horses???
- Not a jetting problem?
- Jetting for the WB E-Series
- Jetting Question
- Floatbowl screws!?!?!
- Oil Tank breakage
- Whats better of the 2 carbs???
- New cam for 300ex
- FMF Power core IV-2 for 300ex
- 416 jetting question and overheating problem??
- E-series Questions
- Yoshi pipe
- Why is my 300 smoking?
- Octane With 11:1compression
- 400ex Pipes (again)
- wb e-series sounds crapy after warmed up
- engine cutting out
- What's wrong? Please help!!!
- Electrical problem please help!!!!!
- Trx426f!!??
- Big Gun or Yoshimura?
- Big Gun, Yoshimura, White Bros R4????
- E-Series quiet core?
- Pro Circuit T-4 and jetting
- Stalling
- My 400EX is smoking
- Gas Switch????
- Another jetting question with the e-series
- 400EX spark plug choice for 13:1 race motor?
- Another jetting Question...
- larger oil tank??
- alternative to outerwears airbox cover
- Big Bores???
- Filtered Airbox Vents
- Trx250ex
- T-4 pipe?
- re-jett????
- Big Bore Kits
- Sputtering EX
- For those FCR carb owners!!!
- Four Stroke Tech cam
- Cough drops for my 400ex
- Y does your engine run cooler if you re-jet and (or) put a pipe on??
- Pantyhose over your airbox with no lid???
- New parts,
- Jetting Help.....
- WB or Pro Circuit
- Awesome jetting help
- Cobra Exhaust...
- How good is the stock head pipe on a 400?
- Larger Oil Cooler?
- Need Some Help
- Yoshimura COMP, White Bros. R4, Big Gun??
- K&N or UNI?
- 400ex carb on 300ex?
- 16th tooth sproket?
- DS650 carb on a 400ex?
- ? about the WB E- series Pipe
- Rev Limiter
- Ordered: FMF Powercore IV-2 S/A full system
- Drag Motor
- How Far can a 400 go?
- WB Rev limiter ?
- jetting sizes with a WB slip-on and K&N power kit??
- Pipe Prices
- Need help fast! Emergency jetting question!!
- Exhaust & Tech Help Please
- Port And Polish?
- Jetting Question??
- i need some help
- Broken DynoJet Adapters
- Carb ?
- 350x vs 400ex round 1
- WB owners please read and reply!!!
- 300ex pipe choice
- no-start ignition problem
- fmf hi flo header?
- how much$$ for a bore / port
- jetting survey
- 250r tranny
- shift fork
- Changing Clutch Cable On 300ex
- need help with carb mod
- 400 Ex Clicking Noise
- Another Jetting question!!!!!!
- need help installing new 300ex clutch
- This is a 2002 right? Then why doesnt it start! Help!
- How can you find out if you have jeted correctly??
- Pipe change????
- lilred....got a question for you...
- engine rebuild
- Clutch slipping?
- Stock Hedder
- 40 Pilot Jet Part Number
- How To Jet
- Question for those with aftermarket exhaust and airbox mods
- Pilot Jet Size
- hopefull raptor killer
- Whose Got a Pro Circuit Silencer?
- Jetting made easy
- is it worth the $ and trouble?? 330 kit for my 300
- suzuki DRZ in 400ex -- please help
- Do you really have too break in a cam?
- running lean
- Dynojet Question
- Jeting and pipe question PLEASE...
- Tech help please. ASAP
- XR400 Cam
- sparks advanced key
- What would be the best mod for the $??
- yet another jetting question by a newbie
- Cdi Box
- Dyno Runs at ROUSH---DETROIT AREA
- Oil Tank!
- Should I switch to a Twist Throttle?
- Choke Plate/ Rev Box?
- Fouled Plug?
- Cost Of Big Bore Kit
- prolem with my 300ex
- changing c/s sproket on 300
- what do you think it'll cost?
- Please Help Sick 300ex
- carb question
- carb suggestion
- Best Exaust??
- whats the best big bore kit?
- #40 Pilot Jet
- How many discs???
- engine building
- Changing Clutch ? ! ? Kinda'
- Adding Disks to WB and Quiet Core?
- XR 400 cam update
- i desperately need help with my 416!!
- Motor Tear Down???????
- what is the correct spark plug gap for a 400EX?
- Stock plugs
- Which Pipe
- Big Gun Complete System?
- Do i need to re jett if im gettign a wb e serious slip on pipe??
- Yoshimura
- 400ex low rpm miss????
- what are the best upgrades for lots of power
- what pipe should i get
- Pro Circuit T4 / Quiet Core insert?
- what is the right quad to get?
- Piston Help
- Oil Cooler
- Installing A New Carb Jet
- cams
- Cam And Piston
- anyone tried the wiseco 10:1
- HP of 400ex?
- Adjusting Valves
- is a 14 front sprocket worth it for a 300ex??
- Oil Question, ASAP
- 416 reveiw
- What exhaust?
- head job ?
- Questions about getting a headpipe for my slip on?