Authorized Revolution Performance Dealer



Revolution Performance
Monster Big Bore Kit (100in), Bore 3-7/8in. - 9.5:1 Compression - Black/Highlighted Fins

This item fits the following models:

Harley Davidson FLSTF Softail Fat Boy 1999 
Harley Davidson FLSTF Softail Fat Boy 1998 
Harley Davidson FLSTF Softail Fat Boy 1997 
Harley Davidson FLSTF Softail Fat Boy 1996 
Harley Davidson FLSTF Softail Fat Boy 1995 
Harley Davidson FLSTF Softail Fat Boy 1994 
Harley Davidson FLSTF Softail Fat Boy 1993 
Harley Davidson FLSTF Softail Fat Boy 1992 
Harley Davidson FLSTF Softail Fat Boy 1991 
Harley Davidson FLSTF Softail Fat Boy 1990 
Harley Davidson FXDB Dyna Sturgis 1991 
Harley Davidson FXDC Dyna Glide Custom 1992 
Harley Davidson FXR Super Glide 1991 
Harley Davidson FXR Super Glide 1990 
Harley Davidson FXR Super Glide 1989 
Harley Davidson FXR Super Glide 1988 
Harley Davidson FXR Super Glide 1987 
Harley Davidson FXR Super Glide 1986 
Harley Davidson FXRC Low Rider Chrome 1987 
Harley Davidson FXRC Low Rider Chrome 1985 
Harley Davidson FXRDG Disc Glide 1984 
Harley Davidson FXRS-CONV Low Rider Convertible 1991 
Harley Davidson FXRS-CONV Low Rider Convertible 1990 
Harley Davidson FXSTB Softail Night Train 1999 
Harley Davidson FXSTS Softail Springer 1999 
Harley Davidson FXSTS Softail Springer 1998 
Harley Davidson FXSTS Softail Springer 1997 
Harley Davidson FXSTS Softail Springer 1996 
Harley Davidson FXSTS Softail Springer 1995 
Harley Davidson FXSTS Softail Springer 1994 
Harley Davidson FXSTS Softail Springer 1993 
Harley Davidson FXSTS Softail Springer 1992 
Harley Davidson FXSTS Softail Springer 1991 
Harley Davidson FXSTS Softail Springer 1990 
Harley Davidson FXSTS Softail Springer 1989 
Harley Davidson FXSTS Softail Springer 1988 

Type:   Cylinder Kit
Style:   Performance Replacement
Displacement:   100"
Compression Ratio:   9.5:1
Bore:   3-7/8"
Sold as:   Kit

Bolt-on big bore kits are exactly that, a bolt-on application for your engine. No case boring or additional modifications/upgrades needed. However, additional modifications/upgrades will help make this bolt-on big bore kit a complete package. Monster big bore kits require modifications/upgrades to your engine that include: case boring, crankshaft balancing and CNC cylinder head upgrades.


Local pickups are welcome! Please contact us to make sure your order is available for local pickup as some items are stored in and ship from fulfillment centers.
Our store is open 10:00am - 6:00 pm eastern time Monday through Friday and located at 905 Mulberry St, Loudon, TN 37774


Got questions? click the contact seller link at top of this page or give us a call toll free.

Return Policy
  • We must be notified within 24 hours of receipt of any missing, defective or damaged goods.
  • All returned items must be in original, non-modified, undamaged packaging. We will not accept returns with damaged, modified (including writing or marks) or missing packaging.
  • All returned items must be in new condition with all documentation, tags, etc intact.
  • Any item which has been used, worn, damaged or had tags/labels removed will not be eligible for return.
  • Any damage claims may be exchanged for the identical item only.
  • No refunds on damage claims, replacement with identical item only.
  • Returned items must be received by us no later than 10 Days.
  • It will be the sole discretion of oemcycle to provide refund, replacement, or return item without refund.

Bolt-on big bore kits are exactly that, a bolt-on application for your engine. No case boring or additional modifications/upgrades needed. However, additional modifications/upgrades will help make this bolt-on big bore kit a complete package. Monster big bore kits require modifications/upgrades to your engine that include: case boring, crankshaft balancing and CNC cylinder head upgrades. Local pickups are welcome! Please contact us to make sure your order is available for local pickup as some items are stored in and ship from fulfillment centers. Our store is open 10:00am - 6:00 pm eastern time Monday through Friday and located at 905 Mulberry St, Loudon, TN 37774 All returned items must be in original, non-modified, undamaged packaging. We will not accept returns with damaged, modified (