KTM Big Bore Kits
Here’s what Motocross Action Magazine said about it… “Big boost: Dollar for dollar the most efficient way to get more power out of a four-stroke is to increase the displacement.”
The KTM280 Big Bore Kit “… the kit is inexpensive and powerful”
KTM 250 Big Bore Kit “…makes it easier to get off the line and more adept at handling hills, sand, and mud.”
KTM 250 Big Bore Kit “…pulls like a John Deere to the first turn, there is nothing like three more horses focused on one job.”
Motocross Action
What does it cost? Would you believe $469? That’s it and all you have to do is button it up and check your carb jetting.
KTM 250SXF Big Bore Kit
( 280cc Big Bore Kit )
All you have to do is send us your cylinder (can be in almost any condition) and we’ll bore it and fit it with a hardened alloy sleeve. We will bore it to 80mm and honed it to fit a JE 12.5:1 piston. The kit comes complete with a JE piston Kit and a top-end gasket set. Nothing else to buy.
All for only…. $469
Also Available is a 13.5:1 compression model ….Only $484
KTM 250SXF Big Bore Kit
( 265cc Big Bore Kit )
Your cylinder will be bored and Re-Nikasil coated to fit a 78mm Wiseco Piston. The kit includes the Wiseco piston, rings, pin, clips, and top-end gasket set.
The standard compression ratio kit is $476
The Kit With a Hi-Compression +.5 skirt coated kit is $495
Camshaft
We highly recommend using the Crower Power Cam -Victory Series. Developed to give your engine more power in the mid-range area of the powerband. The Victory cam is recommended for use on outdoor-style motocross applications. This camshaft works equally well for recreational off-road riders. Everyone from fast novice riders to some of the fastest pro’s can benefit from it’s design and performance
We also recommend the Dr. D Exaust to complete the package. $495
Increase Your Low End and Your Fun At The Same Time
The most economical and effective way to increase the performance of your engine. Available for two stroke and four stroke KTM Motorcycles a like. Whether racing or just trail riding, increasing your engine displacement with a big bore kit will give you that added power you’ve been searching for. Big bore kits are very reliable and easy to install when compared to most other engine modifications.
Send us your cylinder (and head, along with the power valves/two stroke cylinders only), we will bore, sleeve or Re-Nikasil your cylinder to the new larger size. Your power valves will be modified if needed to function properly with the larger bore size. Some models will have the cylinder head re-chambered for the proper volume and compression ratio. Our big bore kits include a high performance piston with piston rings, piston pin and circlips. New top end gaskets are included for most models
KTM 250 SX 285cc Big Bore Kit
KIT INCLUDES SLEEVING, AND PISTON KIT. HEAD AND POWER VALVE MODIFICATION.
KTM-250SX 1990-1994 285cc Kit $595
KTM 250 SXF 280cc Big Bore Kit
KIT INCLUDES SLEEVING, JE PISTON KIT AND TOP END GASKET SET
KTM 250 SXF 2005 – 2007 280cc Kit 12.5:1 compression ratio $469
KTM-250SXF 2005 – 2007 280cc Kit 13.5:1 compression ratio $484
KTM 280 SXF 280cc KIT click here for details
2007 KTM 250 EXCF 280cc KIT
KTM 250 SX – 285cc Big Bore Kit
Fitment: KTM 250SX (1990–1994)
$595
Includes:
- Complete sleeving service
- Piston kit
- Cylinder head and power valve modification
Description:
Send us your cylinder and head — we’ll bore and sleeve it to the new 285cc displacement and modify your power valves for proper function. The cylinder head is re-chambered to ensure the ideal compression ratio and combustion volume for increased low-end torque and strong mid-range power.
Result:
Instant throttle response and more pull off the line. Perfect for sand, hills, and deep loam where torque is everything.
KTM 250 SX-F – 280cc Big Bore Kit
Fitment: KTM 250SXF (2005–2007)
Bore: 80mm
Displacement: 280cc
$469
Option 1: Standard Compression Kit
Compression Ratio: 12.5:1
Includes:
- Hardened alloy sleeve
- JE piston kit
- Top-end gasket set
$484
Option 2: High Compression Kit
Compression Ratio: 13.5:1
Includes:
- Same as above
- with high-compression JE piston upgrade
Performance:
Expect a big boost in acceleration and stronger drive out of corners. Ideal for riders who want more usable power throughout the rev range.
“Dollar for dollar, the most efficient way to get more power out of a four-stroke is to increase the displacement.” “The KTM280 Big Bore Kit is inexpensive and powerful.”
KTM 250 SX-F – 265cc Big Bore Kit
Fitment: KTM 250SXF (2005–2007)
Bore: 78mm
Displacement: 265cc
Option 1: Standard Compression
$476
Option 2: Hi-Compression +.5 Skirt Coated
$495
Includes:
- Bored and Re-Nikasil coated cylinder
- Wiseco piston, rings, pin, clips
- Top-end gasket set
Performance:
“Makes it easier to get off the line and more adept at handling hills, sand, and mud.” “Pulls like a John Deere to the first turn — there is nothing like three more horses focused on one job.”