Does it fit your motorcycle?
Look it up by licence plate or VIN, or choose your model.
Confirmed compatible · Position:
This part doesn't fit your bike. See parts that fit
Fits most motorcycles
Not model-specific. Check dimensions and specifications in the description before ordering.
Chosen by size, not by model
The size is printed on the tyre sidewall, e.g. 120/70 ZR17, and in your registration document.
Checking fitment…
Fitment check unavailable
KB Performance Big Bore Conversion Piston Kit - 4.000" Bore - Standard - KB913CSTD
Product info
- Item number
- MSH-944819
- Position
Forged big bore conversion piston set. Used for converting 96" (3-3/4" bore) and 103" (3-7/8" bore) to 110" (4" bore) big bore. With dished piston domes. Works with all stock cylinder heads, 96" and 103" with 85cc chamber and SE, MVA and CVO with 95cc chambers. 9.5:1 CR with stock 96"/103" 85cc head. Piston weight 350gr. Piston pin weight 89gr. Piston pin dia. .927" / offset. Head type: Dish with +13.3cc. Compression height 1.086". Bore 4.000". Stroke 4.375" (4-3/8"). Rod length 7.667". Cyl. length 4.938". Note: Will not work as bolt-in with OEM H-D 4" big bore conversion cylinders in OEM 96" & 103" crankcases. The cylinders will hit a small step in the crankcase. Also clearance between piston skirt and crankcase must be checked at bottom dead center. Cases with a large cast-in bump, just below the machined area for the cylinder sleeve, must be machined for adequate piston skirt to crankcase clearance. This is on both front & rear cylinder exhaust sides of the crankcase. Note: Will not fit 110" CVO models. Note: All KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with each piston set, prior to installation.
- Category: Pistons and rings kits
- Manufacturer part number: KB913CSTD
Free shipping to a GLS parcel shop or parcel box on orders over €200.
We ship your order as quickly as we can. Orders are usually packed within 24 hours on weekdays.
You have a 14-day right of return. Read more
4.8 out of 5 on TrustpilotRead our reviews →
Certified e-mærket web shop
