670 MXZ, SUMMIT, FORMULA SS & MACH I

The 670 engine is Rotax's best engine combination. It responds very well to modifications. Twin pipes net 8-10HP and 3-4 pounds of torque @ 8200-8300 RPM's over the single pipe. We also have a thicker base gasket which raises the port timing to match the port timing of the twin pipe 670 engines from Rotax. Head must be cut to bring compression back down. We have an Improve Stock or Prostock Race Packages that will produce 158HP @ 9000 RPM's. The race packages include race porting the cylinders and base, head machining & inserts, 2 cylinder race pipes. The Improve Stock Package will also include boring of the stock carbs. Neither of these 2 kits are for trail use. The labor to disassemble, clean, and assemble the motor is NOT included in the package price. Any crank work, repairs, or replacement parts would be an extra charge.

In stock
SKU
670 MXZ, SUMMIT, FORMULA SS & MACH I
Grouped product items
Product Name   Model Price Qty
Acorn/Hex Nut 8mm x 1.25 (420842471) Each
420842471
$5.50
Acorn/Hex Nut 8mm x 1.25 (420842471) Pkg 12
420842471 PKG12
$60.00
670 Improve Stock Package 158HP @ 9000 RPM's
1031960
$2,655.00
670 Pro Stock Package 158HP @ 9000 RPM's
1031970
$2,655.00
Trail Porting (send cylinders, head, and rave valves only)
1031500
$509.25
Tunnel Porting Base Trail
1031700
$141.75
Flat Head Cut 2 Cylinder (This is the head cut that needs to be done when using the .047 & .059 base gasket)
1031300-1
$60.00
Race Porting (160 HP) 8800 RPMs (send cylinders and rave valves only)
1031600
$624.75
Tunnel Porting Base Race
1031800
$278.25
Machine 2 Cyl. Head for Inserts 1051205
1051205-2
$175.00
670 Head Inserts (each) (A2-1)
1005300
$123.25
Tapper Bore Injection Cover Stock
1031400
$125.00
Short Straight RV Cover Non Injection (M1-4)
1001350
$195.00
Bore Carbs to 44mm (each)
1044500-2
$55.75
670 Formula SS Trail Pipes Silenced
1021320
$940.00
670 MXZ Trail Pipes Silenced
1021260
$940.00
670 MXZ Trail Pipes Into Crank Shop Muffler
1021270
$1,200.00
670 MXZ Silenced Race Pipes
1021280
$1,125.00
670 Mach I Silenced Race Pipes
1021330
$1,125.00
670 Summit Trail Pipes Silenced
1021300
$940.00
670 High Altitude Trail Pipes Silenced (over 6000')
1021345
$940.00
670 Summit Trail Pipes Into Crank Shop Muffler
1021310
$1,200.00
670 MXZ 1998 Stock Exhaust Single Pipe Silencer for center outlet pipe only (no hp gain, only weight savings & more noise) no je
1021720-1
$165.00
670 MXZ 1996-97 Stock Exhaust Single Muffler
1027110
Special Price $150.00 was $315.00
670 Standard Piston & ring 78mm (F1-9) NLA use aftermarket
420887612
$0.00
Out of stock
670 Standard Piston & Ring Wiseco (2379M07800) (F1-10)
2379M07800
$175.50
670 HO Standard Piston & Ring (F1-9)
420887617
$180.00
670 STD Ski Doo (Rotax) SPI Piston 9773PS (F1-10)
9773PS
$100.95
670 .010 Over OEM Ski Doo (Rotax) Piston 420887613 NLA (F1-10)
420887613-2
$138.50
670 Ski Doo (Rotax) .020 Over SPI Piston 9773P2 (F2-1)
9773P2-1
$84.95
670 Ski Doo (Rotax) .020 Over Wiseco Piston 2379M07850 (F2-1)
2379M07850-1
$148.00
670 Ski Doo (Rotax) .040 Over Wiseco Piston 2379M07900 (F2-1)
2379M07900-1
$187.10
670 Ski Doo (Rotax) SPI Piston Ring Only Marshall9773PSR& WPS12-14779 (FC4-2)
54-773RS-1
$33.95
670 Ski Doo (Rotax) .020 Over SPI Piston Ring Only 9773P2R/WPS#54773R2 (FC4-3)
54773R2
$34.95
670 Piston Cir Clip OEM 20mm Sold As Each (420845100) (FC4-4)
420845100-2
$1.50
Cometic Base Gasket 670 2 Cylinder .012 (B0110SP7012F) (FC3-2)
B0110SP7012F
$15.75
Cometic Base Gasket 670 2 Cylinder .020 (B0110SP7020F) (FC3-2)
B0110SP7020F
$15.75
Cometic Base Gasket 670 2 Cylinder .031 (B0110SP7031F) (FC3-2)
B0110SP7031F
$15.75
Cometic Base Gasket 670 2 Cylinder .039 (B011SP5039F) (FC3-2)
B011SP5039F
$15.75
Cometic Base Gasket 670 2 Cylinder .047 (B0110SP5047KF) (FC3-2)
B0110SP5047KF
$15.75
Cometic Base Gasket 670 2 Cylinder .047 Ported Cylinder (FC3-2)
B0110047KF
$15.75
Cometic Base Gasket 670 2 Cylinder .059 Ported Cylinder (FC3-2)
B0110059KF
$15.75
Cometic Rubber Coated Base Gasket 670 2 Cylinder .010 (B0110010S) (FC3-2)
B0110010S
$20.00
Cometic Rubber Coated Base Gasket 670 2 Cylinder .020 (B0110020RC) (FC3-2)
B0110020RC
$20.00
Cometic Aluminum Shim 670 2 Cylinder .032 (B0110SP5032A) (FC3-2)
B0110SP5032
$23.50
Inner Oring OEM 670 2 Cylinder (420931220) (FC2-1)
420931220-1
$16.00
Inner Oring Aftermarket 85mm x 2mm Viton 670 2 Cylinder & 975, 1025, 1100 3 Cylinder (FC2-1)
85x2-1
$5.50
Outer Orings OEM (circular shaped oring) Rotary Valve 440 (454) 1996-97, 500 (494) 1997-99, 580 1996, 670 1996-99 2 Cylinder (42
420850040-2
$6.75
Stator Oring 400LC 1998, 440 Rotary Valve 1996-97, 500(494) 1997-98, 670 1996-98 (420850430) (FC2-2)
9262K942
$5.00
Rotary Valve Cover Oring 400, 440, 500, 583, 670 (29300023) was part#420831360 (FC2-3 & M3-4)
293300023-1
$13.50
Exhaust Gasket 583/670/440 2003-07/600HO/700 2 Cyls./600/700/780/809/1006/1019/1025/1100 3 Cyls.(420850552) (FC2-3)
420850552-5
$10.50
Rave Gasket 583 1996-98, 670 1996-99 & 670HO 1998-99 (420230256) (FC2-4)
420230256-2
$7.50
Thermostat Gasket (420850338) was part# 420850336 (FC2-4)
420850338-7
$11.00
Water Pump Gasket 96 RV(420931350) 440 MXZ, 494 Formula SLS, 500 Grand Touring/Summit, 670 FormulaSSGrand TouringSE,MXZ,Summit
WP018SP1031F-1
$5.95
Water Pump Gasket Rotary Valve 6 bolt holes 440 MXZ LC 1997, 500(494) 1997-2000, 583 1997-99, 670 1997-99 (420931355)NLA
WP018020F-3
$5.95
Water Pump Gasket 583 1996 and earlier, 670 1994 OEM (420831616) NLA use cometic WP017SP1020F. (FC2-4)
WP017SP1020F-1
$5.95
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