Engine Repairs or Builds

If your Banshee engine stopped running or doesn't sound right, we can help you diagnose the problem. We test it or take it apart to inspect it and evaluate the condition. 

We have the tools. We specialize and focus on Banshees, so we have the knowledge. We know most of the tricks and nuances for fixing Banshees and getting the level of  performance you are looking for. 

Unless you are a mechanic, it would be easier and faster to have Re-Do Banshee repair or rebuild your engine - or - build it to add performance.  We can:

  • Suggest a practical plan to repair or build your Banshee engine. 
  • Help you get the most bang 💥💥 for your buck 💵. 
  • Provide advice on which combo of engine parts will get you the performance you want.
  • Explain the trade-offs for tuning or building your engine for different riding conditions and riding styles.
  • Help you find the right balance between performance and reliability for your Banshee, and recommend parts combos and setups. 
  • Repair or build your engine based on the plan you and Re-Do Banshee agree on. 
  • Test, tune, and heat cycle your engine in our shop so it's ready to go in your Banshee! 💨
  • Click here for the steps to break in your Banshee engine after a rebuild.
  • Click here for info related to engine displacement. 
  • Click here to see some recent customer builds and repairs.

Standard or Stock Engine Rebuilds

Standard Bore Engine = 64mm and is 347cc.

Stock Engine Rebuild = If an engine has worn or damaged stock cylinders, the top end of the engine can be rebuilt or repaired by boring the cylinders slightly larger than stock and installing larger pistons. 

  • 350-375 cc Stock Cylinders = 64.25mm - 66.5mm bore on a stock stroke (54mm) crankshaft. A stock crankshaft or an aftermarket stock stroke crankshaft can be used. Stock cylinders are bored larger than the stock 64mm bore. Displacement varies depending on how large the stock cylinders are bored to. This engine build is often done as a rebuild to repair the stock engine. 

A stock engine rebuild can be done a few times over the years if needed. The engine will still perform as a stock engine or slightly better, and can still have a lot of life left in it. 

Small Bore Engine Builds

Small Bore Engine = 64mm - 66.5mm. For increased performance, stock cylinders can be over bored (bored over stock diameter), and additional performance parts can be added. For more performance, an aftermarket cylinder kit can replace the stock cylinders, along with other performance parts, which might include a +4 mil crankshaft.

Small Bore Engine builds can be built with stock engine cases or Driveline Performance cases.

Some common small bore engine builds are:

  • 385 cc Stock, Serval, or Cheetah Cub Cylinders = 65 mm bore on a +4 mil stroke (58mm) crankshaft.
  • 397 cc Stock, Serval, or Cheetah Cub Cylinders = 66mm bore on a +4 mil stroke (58mm) crankshaft.
  • 403 cc Stock Cylinders = 66.5mm bore on a +4 mil stroke (58mm) crankshaft. This is the biggest small bore engine you can build using a +4 mil crankshaft. This can be a stepping stone on the way up towards a Big Bore Engine Build. 

Big Bore Engine Builds

Big Bore Engine = 68 mm or larger. 

For +4mil engine builds, stock engine cases can be easily used. For +7mil or +10mil builds, a Driveline Performance engine case is recommended for strength and reliability. We often recommend a +10 mil over a +7 mil crank because there is not much price difference.

Some common big bore engine builds are:

  • 421 cc Serval or Cheetah Cub = 68mm bore on a +4 mil stroke (58mm) crankshaft.
  • 465 cc Serval or Cheetah Cub = 68mm bore on a +10 mil stroke (64mm) crankshaft.
  • 472 cc Serval or Super Cheetah Cub = 72mm bore on a +4 mil stroke (58mm) crankshaft.
  • 521 cc Serval or Super Cheetah Cub = 72mm bore on a +10 mil stroke (64mm) crankshaft.
  • 611 cc Cheetah DM = 78mm bore on a +10 mil stroke (64mm) crank. (This is 611.63 cc, so it shows on our engine displacement chart as 612 cc)

Re-Do Banshee can help you with any of these engine builds. We can help you select the parts for your DIY build, or we can rebuild or build your engine based on the plan you agree on with our help. 

CPI Serval vs Cheetah Cub Cylinders?

  • Serval and Cheetah Cub cylinders have different port timing. Both are manufactured by Cast Precision Industries, Inc (CPI). 
  • Serval has more mid-range power band. Great for trail riding and dunes.
  • Cheetah Cub is more high-revving than the Serval. This makes it better for drag racing. It can also be ridden in the dunes. A serval would be a better option for dirt trail riding. 
  • Mono Cylinders - While stock Banshee cylinders are 2 separate pieces, CPI manufactures their cylinders as 1 piece with 2 cylinder bores. 
  • Cheetah Cub Line - The cylinder names "Cheetah" and "Cub" and "Cheetah Cub" are used somewhat interchangeably. 
    • Cheetah Cub, Super Cub, Cheetah DM, and Cheetah DMX cylinders are all the same line of cylinders. 
    • Engine builds with Cheetah Cub and Super Cub cylinders are sometimes referred to as just "Cub" builds. Examples are 421 Cub (instead of 421 Cheetah Cub), or 472 Cub (instead of 472 Super Cub or 472 Super Cheetah Cub). 
  • CPI's Wampus Cylinder Line is intended for the rider who wants a stock appearance with the performance of a Serval Cylinder.
    • Most of our customers opt for the Serval or Cheetah Cub cylinders, but this is an option we can order for you. We would have to check on availability and ETA for this option. 

NEW! Ship Your Engine to Re-Do Banshee For Repairs 

Do you live too far away to bring your Banshee to us?  We can help you ship your engine to Re-Do Banshee for repairs or rebuild.

After your Banshee engine has been repaired or rebuilt in our shop, we put your engine in our test stand to tune it, test it, and heat cycle it. Once we are sure everything is working just right, we ship it back to you so you can reinstall it in your Banshee. You will then need to do a plug chop to finish breaking in your engine and dial in the jetting. 

If you are interested in shipping your Banshee engine to us for repairs, click here for more info about How to Pack & Ship Your Banshee Engine to our shop. 

If you have any questions, call us to discuss your project or help you diagnose the needed repairs.