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Big Bore & Stroker Kits Big Bore Head Gaskets Big Bore Piston & Rings
Blocks Sleeves Stroker Cranks

Big Bore & Stoker Engine Kits, Cranks, and Pistons

The following parts and kits are offered for experienced engine builders. These are not bolt-in kits and require extensive work for installation to include boring, sleeving, clearancing, balancing, etc. Genuine Honda blocks are recommended for all applications.


Tech References:

Approximate CCs for various combinations - Click Here

Approximate Compression Ratios for Big Bore and Stroker Kits - Click Here

Amount of Piston and/or Deck Milling required for .000 Deck Heights - Click Here

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Sleeve, 3.102" for 3.00" Piston Sleeve, 3.102" for 3.00" Piston

Sleeve for 2.992 & 3" Pistons

Our Price: $37.17
Sleeve, 3.00" for 2.77" Piston Sleeve, 3.00" for 2.77" Piston

Use for 2.7" to 2.85" Bore Diameter

Our Price: $42.53
Crankshaft, Stroker, GX200 & 6.5 OHV (+.060), Aftermarket Core Crankshaft, Stroker, GX200 & 6.5 OHV (+.060), Aftermarket Core

.060 Stroker Crankshaft, Welded and Ground to Produce .060 More Stroke. Puts Piston at -.010 to TDC on Honda Blocks (Chinese OHVs Will Vary).

Our Price: $91.70
Crankshaft, Stroker, Honda GX200 (+.060), QX 3/4" Crankshaft, Stroker, Honda GX200 (+.060), QX 3/4"

Genuine Honda 3/4" QX Stroker Crankshaft, Welded and Ground for .060 More Stroke

Our Price: $98.30
Crankshaft, Stroker, GX160 (+.160"), 180cc, QX 3/4" Crankshaft, Stroker, GX160 (+.160"), 180cc, QX 3/4"

Genuine Honda 3/4" QX, 180cc Stroker Crank, Welded and Ground to Produce .160" More Stroke. Requires UT2 GX160 Piston with Standard Length (3.303) Rod.

Our Price: $104.50
Crankshaft, Stroker, GX160 (+.160"), 180cc, HX (6 to 1 Gear Box) Crankshaft, Stroker, GX160 (+.160"), 180cc, HX (6 to 1 Gear Box)

Splined HX, Genuine Honda 180cc Stroker Crank, Welded and Ground to Produce .160" More Stroke. Requires UT2 GX160 Piston with Standard Length (3.303) Rod.

Our Price: $129.80
Crankshaft, Stroker, GX390 & 420 Predator, 69mm (+.200"), 420-460cc: Aftermarket Core Crankshaft, Stroker, GX390 & 420 Predator, 69mm (+.200"), 420-460cc: Aftermarket Core

69mm Crankshaft, Producing up to 460cc. Chinese OHV Core That Fits Honda GX340 and GX390, or Any 420 and 440 Chinese OHV.

Our Price: $129.99
Crankshaft, Stroker, GX390 & 420 Predator, 72mm (+.275"), 420-479cc: Aftermarket Core Crankshaft, Stroker, GX390 & 420 Predator, 72mm (+.275"), 420-479cc: Aftermarket Core

69mm Crankshaft, Producing up to 479cc. Chinese OHV Core That Fits Honda GX340 and GX390, or Any 420, 440, and 460 Chinese OHV.

Our Price: $129.99
Crankshaft, Stroker, GX160 (+.160"), 180cc, RH (2 to 1 Gear Box) Crankshaft, Stroker, GX160 (+.160"), 180cc, RH (2 to 1 Gear Box)

180cc Genuine Honda Stroker Crank, Welded and Ground. Produces .160" More Stroke. Requires UT2 GX160 Piston with Standard Length (3.303) Rod. 2-to-1 Crank RH.

Our Price: $148.00
Crankshaft, Stroker, Honda GX270 (+.160"), 292cc, QA Crankshaft, Stroker, Honda GX270 (+.160"), 292cc, QA

292cc Stroker Canoe Honda Crankshaft. Welded and Ground, Producing .160 More Stroke. 1" Shaft QA.

Our Price: $171.00
Engine Kit, 202cc, 2.186 (+.060) Stroker, 2.68 Bore, Clone Crank & Piston Engine Kit, 202cc, 2.186 (+.060) Stroker, 2.68 Bore, Clone Crank & Piston

202+CC Engine Kit for 6.5 BSP Clones. BSP “Clone” Crankshaft Welded and Ground, Producing .060 More Stroke.

Our Price: $177.00
Engine Kit, 214cc, 2.225 (+.060) Stroker, 2.756 Bore Engine Kit, 214cc, 2.225 (+.060) Stroker, 2.756 Bore

214+CC Engine Kit for GX200s & 6.5 OHVs with Welded and Ground 2.756 Bore Genuine Honda Crankshaft, Producing .060 More Stroke

Our Price: $189.00
Engine Kit, 180cc, GX160 + .160", Stroker Kit Engine Kit, 180cc, GX160 + .160", Stroker Kit

180cc Bolt-In Stroker Kit (+.160") for GX160s

Our Price: $193.00
Engine Kit, 218cc for Old Style Predator Engine Kit, 218cc for Old Style Predator

218+ CC Engine Kit for Old Style 212 Predators. OEM Crankshaft Welded and Ground.

Our Price: $203.00
Engine Kit, 218cc for Hemi Predator Engine Kit, 218cc for Hemi Predator

218+CC Engine Kit for 212 Hemi Predators. OEM Hemi Crankshaft Welded and Ground.

Our Price: $203.00
Engine Kit, 202cc, 2.186 (+.060) Stroker, 2.68 Bore, Honda Crank & Piston Engine Kit, 202cc, 2.186 (+.060) Stroker, 2.68 Bore, Honda Crank & Piston

202+CC Engine Kit for GX200s. Genuine Honda Crankshaft Welded and Ground, Producing .060 More Stroke.

Our Price: $208.00
Crankshaft, Stroker, Honda GX200 (+.060), RH (2 to 1 Gear Box) Crankshaft, Stroker, Honda GX200 (+.060), RH (2 to 1 Gear Box)

.060 Stroker Crank. Genuine Honda Crankshaft Welded and Ground for .060 More Stroke. 2 to 1 Gear Box RH Crank.

Our Price: $222.00
Crankshaft, Stroker, GX390 & 420 Predator, 414-433cc: Genuine Honda Q Core Crankshaft, Stroker, GX390 & 420 Predator, 414-433cc: Genuine Honda Q Core

414cc Stroker Canoe Honda Crankshaft, Welded and Ground, Produces +.160 More Stroke for a Total of 2.68" (68mm)

Our Price: $227.00
Engine Kit, 218cc Kits, 2.186 (+.060) Stroke, Forged Piston, Hemi Predator Engine Kit, 218cc Kits, 2.186 (+.060) Stroke, Forged Piston, Hemi Predator

218-227cc Kit with .060 Stroker Crank for 212 Predators

Our Price: $309.00
Engine Kit, GX390/420, 440cc Kit, +.200 Cast Crank, 90mm Cast Piston Engine Kit, GX390/420, 440cc Kit, +.200 Cast Crank, 90mm Cast Piston

440cc Engine Kit for GX390/420s with 90mm Bore. Includes Rotating Asembly.

Our Price: $313.00
Block, 3" (76mm) Sleeved GX200 Honda, Finished Bore, Genuine Honda Block, 3" (76mm) Sleeved GX200 Honda, Finished Bore, Genuine Honda

Excellent Platform for 3" Monster Motors

Our Price: $313.00
Crankshaft, Stroker, +.175, Billet, GX200 & 6.5 OHV Crankshaft, Stroker, +.175, Billet, GX200 & 6.5 OHV

2.3" Stroke (+.175) Billet Crankshaft for GX200 & Honda-Style Clones

Our Price: $319.00
Engine Kit, GX390, 420cc , +.200 Cast Crank, 88mm Cast Flattop Engine Kit, GX390, 420cc , +.200 Cast Crank, 88mm Cast Flattop

420cc Engine Kit for GX390s with Stock Bore. Includes Rotating Assembly.

Our Price: $320.00
Engine Kit, GX270, 292cc (+.160) Stroker, Q (1" Shaft) Engine Kit, GX270, 292cc (+.160) Stroker, Q (1" Shaft)

292+CC Engine Kit for GX270s. Includes Rotating Assembly.

Our Price: $339.00
Block, 3" (76mm) Sleeved, Finished Bore, Tillotson Block Block, 3" (76mm) Sleeved, Finished Bore, Tillotson Block

This 76mm Block Has Been Steel Sleeved and Is Ready to Build. An Excellent Platform for 3” Monster Motors!

Our Price: $374.00
Short Block, Racing, 6.5 OHV (Chinese) Short Block, Racing, 6.5 OHV (Chinese)

6.5 Chinese OHV Racing Short Block with Several Options Available

Our Price: $393.00
Crankshaft, Stroker, +.175, Special Billet Alloy, GX200 & 212 Predator Crankshaft, Stroker, +.175, Special Billet Alloy, GX200 & 212 Predator

Billet Steel GX200 Stroker Crank, +.175, 1" Pin. Requires Special ARC Rod (3.625). Machined from Solid Bar of Alloy Steel.

Our Price: $399.00
Block, 3" (76mm) Sleeved, Finished Bore, Tillotson Block with Tank Mounts Block, 3" (76mm) Sleeved, Finished Bore, Tillotson Block with Tank Mounts

3" Reinforced Tillotson Racing Block with Tank Mounts

Our Price: $404.00
Short Block, Racing, 212 Predator Short Block, Racing, 212 Predator

212 Predator Racing Short Block with Several Options Available

Our Price: $423.00
Short Block, Racing, Predator Short Block, Racing, Predator

Predator Racing Short Block with Several Options Available

Our Price: $425.00
   
 
Can't get enough power from your engine with off-the-shelf parts? We have the big bore and stroker parts you need to push your small engine to the limit. To install these big bore pistons and rings, you will need to bore out the stock block. Piston sleeves add strength back to bored blocks. We offer pre-sleeved blocks, cutting down on the amount of machining needed. Big bore head gaskets create a tight seal around machined blocks and heads.
Stroker kits increase the distance the piston travels on each rotation. This adds displacement, increasing torque. These kits include a new crankshaft, piston, rod, rings and hardware. The crankshaft must be balanced before use. You can do this yourself, or we can do it for you for an additional fee.