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Wes's 397 4-Mil Engine Build

We are in the process of creating videos for this build. We will be posting them on our social media pages and on this page.

More info and videos coming soon! 

 

For more info on Wes's build: 

  • Watch the video. 👀 
  • Scroll down ⬇️ for the link to watch the build's whole playlist on Youtube. 
  • Keep scrolling down ⬇️ to see the build specs below the video.
EMBED VIDEO HERE (coming soon!)
EMBED PLAYLIST BUTTON HERE (coming soon!)

 

Q- Have questions about selecting parts or getting help with your build? 
A- You can call 📞📱 or message us at 541-419-6054. 

We are flexible and will work with you. We can: 

  • Help you select the parts for your DIY build and ship them to you. - OR -
  • Build your engine and ship it to you to install. - OR -
  • Complete the whole build for you and install in your Banshee.

Wes's Engine Specs

  • BUILD NAME: Wes's 397 4-Mil Engine Build
  • EXPECTED RIDING CONDITIONS:  Recreational dune & trail riding
  • DISPLACEMENT:  397cc 
  • ENGINE CASES (CASE HALVES):  Stock Cases
  • CYLINDERS:  Stock - Bored to 66 mm
  • PORTED:  Stock Porting with exhaust raised 2 mm
  • PISTONS: Wiseco 66 mm - 573 Pro-Lite Blaster 
  • CYLINDER HEAD: NOSS Performance Head
  • BASE GASKET:  .030"
  • DOMES:  22 cc __ degree .0_ _ relief
  • CRANKSHAFT: HotRods 58 mm long rod (4 mm over stock), trued and welded
  • COMPRESSION:  TBD (determines fuel recommendation)
  • TRANSMISSION:  Stock
  • REEDS / CAGE:  Stock - or - Moto Tassinari VForce4 Reed Valve System
  • CARBS:  Stock Mikuni 
  • CARB JETTING:  340 mains, 30 pilots (varies based upon engine build and elevation)
  • NEEDLES:  5N7U needles for Stock Mikuni. 
  • AIR SCREW ADJUSTMENT:  3/4-1 turn out for stock
  • FUEL RECOMMENDATION:  Premium Non-Ethanol (91-94 Octane) for 125-150 psi 
    • (based on targeted compression, final compression will determine fuel)
  • WATER PUMP IMPELLER:  Stock
  • CLUTCH: 
  • CLUTCH BASKET:  Redline Racing Basket with Stock Gears
  • CLUTCH SPRINGS:  TBD
  • CLUTCH LEVER:  Aftermarket
  • EXHAUST: FMF Fatties
  • STATOR:  Appears to be Stock
  • TIMING: Will likely be set to 4 degrees advanced (eg, OEM 4-mil, not ported, on pump gas, or Serval on pump gas)

 

 

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References:

  • We calculate engine displacement based on the bore in the engine's cylinders and the stroke length of the crankshaft. Click here for more explanation in our Banshee Engine Displacement blog article. 
  • Click here for information about Banshee engine break-in procedures. This includes our recommendations for Fuel to Oil Ratios and Selecting the Correct Fuel.

About the Authors:

This project article was written by Janel with plenty of help from Virgil. Virgil is the Banshee mechanic, and I am the website mechanic. I do own and ride a Banshee, which helps. 

The Re-Do crew hopes sharing our project info and specs may help some with their own projects, or that you find it interesting. Writing and editing these articles helps me (Janel) make better sense of the parts, fitment, and what goes with what. I want our technical info to be accurate and helpful.

Please do let us know if you like our project articles, or if you think I need to correct something. You can send an email to info@redo-parts.com - and your comments will be passed along to me. 

Thanks ~Janel 😉👌

Email to: info@redo-parts.com