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YAMAHA 2 STROKE MOTOR MODS
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HIGH PERFORMANCE HEAD
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Our billet heads reduce detonation & greatly enhance cooling while increasing bottom and mid-range horsepower. Detonation is reduced while compression is increased by virtue of computer aided combustion chamber design. The result is more
compression and a correct squish band; a feature that can’t be duplicated by milling your stock head. Each size combustion chamber is a unique design, not just a cut down version of some other size. Cooling is enhanced by increasing water contact with the combustion chamber by stair-stepping the chamber sides (something that can’t be duplicated in a cast head). Replaceable chambers are available in 1cc increments.
All heads are polished & anodized for durability and continued great looks.
The Head
design features a 2 piece shell (top & bottom halves) and 3
replaceable domes.
Use / reuse stock head gaskets (not included). The upper & lower halves use O-ring seals along with chamber inserts. |
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High Perf
MM Heads with Replaceable Chambers |
US Dollars |
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| mhm-0100-xx | Complete Head with Replaceable Domes (spec chamber size) | $ 350 | |
| mhm-0200 | Replacement O-ring set | $ 25 | |
| mhm-0300 | Replacement Dome (each) | $ 50 | |
| mhm-0303 | Replacement Dome Set | $ 100 | |
| mgm-0101 | OEM Head Gasket Set of 3 | $ 80 | |
VIPER & SRX BILLET HEAD EXTREME COOLING |
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Our billet heads reduce detonation & greatly enhance cooling while increasing bottom and mid-range horsepower. Detonation is reduced while compression is increased by virtue of computer aided combustion chamber design. The result is more
compression and a correct squish band; a feature that can’t be duplicated by milling your stock head. Each size combustion chamber is a unique design, not just a cut down version of some other size. Cooling is enhanced by increasing water contact with the combustion chamber by stair-stepping the chamber
sides (something that can’t be duplicated in a cast head). Replaceable chambers are available in 1cc increments for the Viper and 1.5cc increments for the SRX. All heads are polished & anodized for durability and continued great looks.
The Viper comes with a separate water manifold. This new design improves
water flow an enhances cylinder to cylinder cooling. The Viper & SRX
heads are both compatible with DTS (Detonation Control System). SRX uses
the OEM water manifold.
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VIPER
HEAD with Replaceable Domes |
US Dollars |
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| mhv-0110-xx | Complete Viper Head with Replaceable Domes (spec cc) | $ 399 | |
| mhv-0200 | Replacement O-ring set | $ 25 | |
| mhv-0300 | Replacement Dome (each) | $ 50 | |
| mhv-0303 | Replacement Dome Set of 3 | $ 100 | |
| SRX HEAD with Replaceable Domes | |||
| mhs-0100-xx | Complete Head with Replaceable Domes (spec chamber size) | $ 375 | |
| mhs-0200 | Replacement O-ring set | $ 25 | |
| mhs-0300 | Replacement Dome (each) | $ 50 | |
| mhs-0303 | Replacement Dome Set of 3 | $100 | |
V-FORCE DELTA-3 REEDS |
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The new VForce Delta 3s. This new and improved version has
continued to build upon the industry leading design that doubles the reed
tip surface of a standard reed valve. The advantages of doubling the reed
tip surface are numerous. On a VForce, with it’s less restrictive
design, the reed petals only travel half the distance of a standard valve
resulting in greater airflow through Exclusive to the VForce 3 is a patent pending snap together cage design
that utilizes symmetrical reed petals, eliminating the need for different
“inner” and “outer” replacement petals. Also new is the patent
pending reed tip shape that accelerates the air mixture over the reed
tips, ensuring increased airflow for |
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V-FORCE DELTA-3 REEDS |
US Dollars |
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| mrr-0210 | Delta 3 Reeds for all Yamaha Triples | $ 340 | |
| call | Delta 1, 2 & 3 Replacement Parts | Call | |
| call | Any Set of Reeds and get Reed Spacers for $50 | $ 50 | |
REED SPACER KIT FOR ALL YAMAHA TRIPLES |
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| The reed cage on the MM/SX(r) blocks off the Intake port feeding the rear of the cylinder, resulting in restricted fuel flow. Spacing out the reed cages gives the air and fuel a much straighter path to this rear port. By smoothing out the fuel flow you gain 3hp at low/mid and 1hp top end, plus the steady slow speed burble at low end is nearly eliminated, resulting in improved throttle response. Kit comes complete with longer bolts, 6 OEM gaskets, and spacers. Works great with V-Force and Carbon Tech reeds. |
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REED SPACER KIT |
US Dollars |
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| mrr-0980 | Reed Spacer Kit for All Yamaha Triples | $69.95 | |
| call | Any Set of Reeds and get Reed Spacers for $50 | $ 50 | |
CARBON TECH REEDS |
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| The very latest in reed pedal design. Reeds provide Awesome Bottom End and Acceleration. Ideal for all around trail riding! Aerospace Material produces more power than other reeds. Responds to fluctuations in RPM faster. | |||
Carbon Tech Reeds |
US Dollars |
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| mrm-0100 | MM / SX / SXr 97-02 | $ 136 | |
| mrs-0100 | SRX and VIPER | $ 136 | |
| call | Any Set of Reeds and get Reed Spacers for $50 | $ 50 | |
BOYESEN RAD VALVES |
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| CLOSE-OUT!!! |
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Boyesen Rad Valves |
US Dollars |
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| mrz-0300 | Close-out price | ||
REMOTE FUEL SCREW ADJUSTERS |
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| PRICE REDUCED!!!!
Fits All Triple 2 Stroke Models (Viper, SRX, SX, Mountain Max, etc). |
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REMOTE FUEL SCREW ADJUSTERS |
US Dollars |
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| mcf-0100 | Remote Fuel Screw Adjusters - Sold in Sets of 3 | $149.95 | |
OEM CARB JETS & NOZZLES |
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MPI stocks a complete selection of jets for all Yamaha triples. All components are genuine Mikuni. Note RX-1 also uses same main jets listed. Main Jet Example (120, 121.3, 122.5, 123.8, 125, 126.3, 127, 128.8) |
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OEM
CARB JETS & NOZZLES |
US Dollars |
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| mjm-xxxx | Main Jets 120-160 by 2.50 (120, 122.5) | $ 3.50 | |
| mjm-xxxx | Main Jets 1/4 sizes (xx1.3, xx3.8, xx6.3, xx8.8) | $ 6.50 | |
| mjp-0xxx | Pilot Jets 45 to 65 by 2.5 (60 pilot = mjp-0600) | $ 7.95 | |
| mja-0xx0 | Air Correction Jet 0.7 to 1.2 by 0.1 | $ 5.00 | |
| mjn-01x0 | Nozzles P5 to Q8 (Q2 = mjn-0120) | $ 24.70 | |
MOUNTAIN
PERFORMANCE AIR INTAKE
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| STOP THE BOG. KEEP THE EXHAUST OUT! More cold air is key to making the Mountain Max, SRX and the VIPER run well and this new Air Intake does just that. The increased cold air translates into 3HP (or more with pipes) throughout the powerband. Deep powder consistency is drastically improved by keeping the air flowing. Also available for other brands. Installation is a snap. Kit includes 4 complete filter units. |
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MPI AIR INTAKE |
US Dollars |
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| mhf-0100 | Filter Kit of all Yamahas | $ 49.00 | |
| mhf-1100 | Powder Pre-Filters for MPI Filter Kit | $ 19.95 | |
POWDER PRE-FILTERS |
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| These Pre-Filters are designed to keep snow and water from getting to, and clogging, the pleats of air filter elements. The unique polyester material contains uniform openings. These openings allow air in, yet keep the snow out and off! This keeps your sled breathing great in the deepest of powder. Extensive dyno & flow bench testing has shown no measurable loss in horsepower or air flow. The Viper Ram Air Kit is a must for Mountain Vipers. It makes the rams functional and includes pre-filters. Viper short tracks and all 02 Vipers only require the pre-filters (because rams are already inc.). |
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Powder Pre-Filters |
US Dollars |
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| mhf-1100 | Powder Pre-Filters for MPI Filter Kit | $ 19.95 | |
| mhf-1220 | MM/SX Powder Pre-Filters for OEM Hood Foam | $ 19.95 | |
| mhf-1300 | SRX Pre-Filters for Air Box | $ 19.95 | |
| mhf-1500 | Viper Powder Pre-Filters Air Box | $ 19.95 | |
| mhf-1900 | Viper Hood Ram Air Pre-Filters | $ 29.95 | |
| mhf-1920 | Mtn Viper Rams & Ram Air Pre-Filters | $59.95 | |
VIPER ENGINE TORQUE LIMITER |
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| The Viper model is Non-Adjustable. Due to the higher levels of torque experienced on the Viper, a rubber isolated direct mounting was selected in place of a rubber snubber. |
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ADJUSTABLE TORQUE LIMITER |
US Dollars |
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| mtv-0110 | Torque Limiter for Viper (non- adjustable) | $ 49.95 | |
OEM REPLACEMENT FILTERS |
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MPI offers replacement OEM filters for the Mountain Max. |
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OEM REPLACEMENT FILTERS |
US Dollars |
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| mhf-0200 | MM Air Box Top Filter | $ 39.02 | |
| mhf-0220 | MM Hood Air Intake Foam Element | $ 16.31 | |
SRX COLD AIR INTAKE KIT |
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| The SRX Cold Air Intake Kit offers a great solution for the SRX’s air intake problem in deep snow. It features a foam seal between the air box and hood, an ABS plastic scoop that mounts in front of the gauge pod, includes a filter element that fits inside the new scoop. |
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SRX COLD AIR INTAKE KIT |
US Dollars |
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| mhf-0400-bk | SRX Cold Air Intake Kit | $ 99.95 | |
| mhf-1220 | Powder Pre-Filter for Scoop Foam | $ 19.95 | |
Viper, SRX & Mountain Max / SX(R) PORTING |
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| All of our porting is CNC’d and operates at stock RPM. Unlike other porting, this adds bottom and midrange pull as well as top end horsepower. When you're done you have a very noticeable gain in performance while leaving you with stock-like reliability because it runs at stock RPM (8500). Ports are CNC’d for maximum flow & consistency. Clutching & jetting are required to get the full benefits of the Porting along with 91-octane fuel (min). Viper porting adds 7HP and 5ft-lbs of torque MM adds 12 horsepower and 8 ft-lbs of increased torque |
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CNC PORTING |
US Dollars |
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| Porting Reservation - Minimize Down Time with a Reservation (requires downpayment) | $200 down | ||
| mpv-0100 | Viper Porting (use your cylinders) | $ 649.95 | |
| mpm-0100 | MM/SX Porting (use your cylinders) | $ 685 | |
| mpm-0200 | MM/SX Porting (with 3 new OEM cylinders) | $ 1185 | |
VIPER & SRX 835cc MOUNTAIN BIG BORE |
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| Who says there’s no 800 Yamahas to compete with the other brands? We’ve got your 800+cc right here. 178 HP and 110 ft-lbs. Don’t settle for a little Big Bore when you can have an 835cc Monster on pump gas. Boring and nicasil-ing alone damages the cylinder structure. We install new sleeves for the durability required. While it’s often easy to make HP by raising the compression, this Big Bore does it on lower compression and is pump gas safe. You get tons of raw power from the larger bore, unique port design, and an exclusive cast piston, which have proven better than forged pistons on this torque monster. Complete kit includes modification of your cylinders (Cylinder Porting & Steel Sleeves), Custom Cast Pistons (with rings, wrist pins and circlips), modification to your head(s) and power valves plus gaskets (2 base gaskets, shim, and O-rings). Exchange possible.
On SRX only, we recommend this kit be used in conjunction with the SRX Big Bore Pipes. Viper pipes (listed on the Exhaust / Pipes Page) work perfectly for the 835cc Viper (in fact the Viper pipes were designed with the 835 in mind). Case Porting and Crank Welding are highly recommended. Complete motor assembly is also available. Case porting is worth another 10HP with Big Carbs and the throttle response is out of this world!!!! |
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835cc BIG BORE |
US Dollars |
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| mbs-1800 | SRX 835cc Big Bore Kit (use your cylinders) | $ 2395 | |
| mbv-1800 | VIPER 835cc Big Bore Kit (use your cylinders) | $ 2395 | |
| mbc-1000 | Ture & Weld Crank (viper or srx) | $145 | |
| mbc-1800 | Viper & SRX Case Porting | $495 | |
| mbc-2000 | Big Bore Motor Assembly | $270 | |
| eba-1800 | SRX Big Bore Pipes | $ 1095 | |
OEM PARTS PAGE |
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| CLICK HERE FOR OEM PARTS PAGE |
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