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Portland Design Works Bar-Ista Coffee Cup Holder
List Price: |
DescriptionBAR-ISTA COFFEE CUP HOLDER |
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Park Tool Wall Mount Bottle Opener
List Price: |
DescriptionPark Beverage EssentialsCleverly disguised as a water bottle cage, the BO-5 attaches to any wall, workbench or cabinet and includes a handy water bottle style cap catcher |
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Minoura Dura-Cage 4.5mm T8 Ti Finish with Alloy Bolts
List Price: |
DescriptionThe Dura-Cage is lightweight, durable, and designed to fit normal poly water bottles.Made of lightweight and durable #2017 DuraluminItem SpecificationsColorTitanium FinishWeight39gCage MaterialAluminum |
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Minoura Dura-Cage 4.5mm Silver with Alloy Bolts
List Price: |
DescriptionThe Dura-Cage is lightweight, durable, and designed to fit normal poly water bottles.Made of lightweight and durable #2017 DuraluminItem SpecificationsColorSilverWeight39gCage MaterialAluminum |
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Minoura Dura-Cage 4.5mm Black with Alloy Bolts
List Price: |
DescriptionThe Dura-Cage is lightweight, durable, and designed to fit normal poly water bottles.Made of lightweight and durable #2017 DuraluminItem SpecificationsColorBlackWeight39gCage MaterialAluminum |
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Bicycle Wheather Resistant Smart Phone Handle Bar Mount Bag for IPhone, BlackBerry, and HTC( with Mini Handebar Mount)
List Price: |
DescriptionA great way to keep your iPhone* handy for communication or to use as a GPS during longer rides. This iPhone specific pack features a foam body for protection and a clear touch window for viewing phone display... |
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iBike Coach GPS cycling computer for iPhone 3G, 3GS, 4
List Price: |
DescriptionThe Coach is ready for the roads and the unexpected challenges that come with them! The lightweight (82g), weather-resistant iBike Coach easily mounts over your bike stem to provide a rugged-tough protective device that delivers both water and shock protection... |
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ASICS Unisex Adult Long Haul 2 Bottle Belt |
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ASICS Unisex Adult Long Haul One Bottle Belt |
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Blackburn Mountain Bicycle Water Bottle Cage (Black)
List Price: |
DescriptionThe Blackburn Mountain Aluminum Bottle Cage is the cage you want for your bike when all you need is a drink. When you finish a grueling climb or crush a technical downhill, you just want to grab some water, and the beefy aluminum design will guarantee the bottle's on your bike, not on the trail... |
Industrial engines. They are still used by several manufacturers (most notably Blata on their entry level bike) and typically produce between 2.5 and 3.5 horse power (hp). All are air-cooled. Tuning and performance parts are very limited.
The Chinese 47/49cc. These engines are used in the Chinese made mk2, and mk3 minimotos. They are air cooled and produce between 2.5 and 3.5 horse power (hp). This engine is different from the industrial engine that is used in the Blata, as it is specifically created for mini moto use.
Polini 4.2 engine. This is the basic Polini engine and, as it's name suggests, it produces 4.2 hp in standard form. It is air-cooled and uses the 'series I' crankcase with the 3-port cylinder. There is plenty of scope and parts for tuning but few people bother because most racing classes for the 4.2 won't allow any modifications.
Polini 6.2 engine. The top end of this engine is the same as the 4.2 (3-port) but is available with either water or air-cooling. The bottom end uses the 'series II' crankcase. This helps to make it more powerful. Race regulations don't allow modification to the engine internals but do allow performance parts, the most significant being the exhaust. There are a wide range of alternative exhausts that year after year manage to extract more power from the engine. Consequently the 6.2 'tag' no longer means anything, these little rockets (more often referred to as 'production' nowadays) claim power outputs of up to 9hp.
The Chinese made water cooled engine. This engine is very similar to the Polini 6.2 however it is a series 1 crankcase engine. The engine is water cooled and is used in the Origami B1 replica. The engine produces around 7.5/8.5 horse power (hp) Many of the parts on this engine are interchangeable with the Polini.
What's the difference between the 'series I' and 'series II' crankcase?. Fuel is drawn from the carb into the crankcase via a one-way valve known as the 'reed valve'. The intake port (where the reed valve and carb join the engine) on the series I engine will only accommodate a reed valve assembly with one reed 'petal' whereas the series II will take a reed valve 'cage' that accommodates two reed petals. A two-petal reed valve will allow more fuel mixture to flow into the engine and, therefore, produces more power.
Polini Super engine. The super also uses the series two crankcase but with a 5-port cylinder. It is only available in water cooled now but used to come as air cooled as well. To compete with Polini, Mallossi manufacture an alternative 5-port cylinder. There are no restrictions on tuning supers and with engine 'porting', bigger carbs and other performance parts they can be turned into awesome machines (for their size) easily producing 12hp.
What is meant by 3 and 5 port?. This refers to the amount of 'transfer' ports built into the cylinder. The transfer ports draw the fuel mixture up from the crankcase and 'dump' it above the piston prior to ignition. A five-port cylinder has potential to produce more power.
40cc or 50cc. The 3 port engines are only available in 40cc. The 5 port cylinder comes in both 40 and 50cc. ZPF offer a tuned 5-port polini cylinder with their own 'special' cylinder head. The extra cc gives 25% more displacement and, therefore, has the potential for more power. 50's are more common in the USA but they're catching on fast in the UK. The UK now allows them to race in championships.
The Polini engine components are interchangeable, which can make for some interesting combinations. However, people don't tend to bother because of class restrictions and it is usually easier to upgrade the whole bike or change the complete engine.
Matt Tong has been importing and riding Mini Motos for two years. For expert advice and Mini Moto information please visit http://www.minimotosandmore.com























































































