Torque Pro 70cc 4 Stroke

[Rell Jette]

Torqpro Engines have a reputation for performance and value with their gas powered engines. Their 70cc four stroke gas engine provides both. The TP-70 provides 6.2hp @ 6800rpm and is suitable for larger models in the 50cc to 70cc range.

Perfect for large/giant scale aircraft its light weight and compact size will make mounting all the easier and with the TP-70 you get all the benefits of a four stroke engine including its unique sweet sound and of course the economy of gas.

If you want to play with the standard 'bike.' Raise the exhaust port 1mm, widen it so only far that the rings don't distort or catch and polish the port to death. Don't do the inlet as you need some swirl. Advance the ignition a gnats nadgers and see what she does.

You can get small 2 strokes to go like billyoh if you want. I had a 1986 dt50, high comp piston, porting, polishing, custom exhaust system, jetted carb after porting and it was awesome. Until 6 miles later it over heated new water pump and bigger rads sorted it out marginally. Wanted a fan on it but it ran a 6v system and I got rid of it not long after. As dunkield says Stan Stephens is a wizard with 2 strokes, my old man had an rd350lc with a Stan Stephens engine in it, was a laugh until it needed rings every other week keep us updated with it and enjoy yourself

OK,just ordered a high torque 70cc kit,barrel,head,piston,dellortro copy carb and jets, 45 degree high flow air filter,full racing crank,new bearings seals and gaskets for a full rebuild, jamarcol exhaust, flywheel remover,accelerator cable and a piston stop for 254 delivered from the Netherlands. With this kit I get all the instructions on what how and how much to remove from the engine to optimise what I want, I'm after a torquey quick motor not speed.

Now cleaned ready to match mark the cases to the barrel, but I have found out I'm not going to have enough sealing face between the case and the barrel, so hopefully I can get the alloy case's built up with weld ready to file flush, enabling enough gasket contact area to seal the barrel to the case's.

There are different levels of performance 2 stroke exhausts, from basic to full race. The exhausts we sell are designed for use with a standard 50cc cylinder as well as an upgraded 70cc cylinder. Different exhausts are available for different scooters, however for most makes and models the Arrow Street and Extreme exhausts are quite appropriate

If it sounds daunting, any good motorcycle mechanic will find it an easy task to fit and tune. We also have an instructional video below which should give you a good idea of how to install and tune a performance exhaust.

Below Left is a video of a Liquid Cooled 70cc kit being unboxed, so you can see what these its come with and what they replace from your standard engine. Below Right is an unboxing of an Air Cooled 70cc kit.

A performance variator usually has the effect of smoothening the acceleration out, giving a consistent and predictable ride, which can give the rider more confidence throughout the speed range of the scooter. A performance variator is also built tougher, designed to take
more punishment than most standard variators. On top of this performance variators are usually more sensitive to small changes in roller weight tuning also.

Final note: it is important to note that the transmission of a scooter only works well when balanced finely. All elements need to work together properly. For instance, adding a Diff Gear kit may require a slight change to the weight of the rollers to counteract the difference slightly. The pursuit of fast scootering is often won or lost in the transmission!

Installing a larger carburettor allows more air and fuel into the motor, producing more power. Depending on your mechanical and tuning ability this can be the more complicated and fiddly side of tuning. Most 50cc scooters come standard with between a 12mm and 17.5mm carburettor. For performance purposes these can be replaced with a 19mm or 21mm carburettor. The sizing refers to the size of the inlet on the carb, a larger inlet means more air.

Malossi make a series of Carburettor kits in both 19mm and 21mm for the specific purpose of improving the intake on 50cc scooters. These kits are scooter model specific in most cases, with all the appropriate parts included to fit the upgraded carb to the your specific scooter. The kit includes the carb, manual choke kit, mounting plates for the choke kit and in most cases 2x airbox stuffers (small cylinders with a flat edge on one side). To install the stuffers, drill 2 appropriately sized holes (matching the diameter of the stuffers) in the inlet side of the airbox. The stuffers have a small lip at the end of them, the idea being that they just slide in and snap into place giving you tidy looking holes for additional air flow. Standard airboxes typically restrict air flow, many also have rubber boots at the airbox air inlet which can be removed to help reduce this restriction as well.

It is EXTREMELY IMPORTANT that you only install the stuffers on the inlet side (air that has not yet been filtered). Generally speaking, most airboxes draw air through the outer side of the airbox, through the filter in the centre, with the filtered air passing into the carburettor via the inner (wheel side) of the airbox. The stuffers in this case would need to be installed on the outer side of the airbox. The additional air that is allowed into the airbox must pass through the air filter.

It is also recommended to change the reed valve with the carburettor, to allow more air flow. The reed valve acts as a one way valve on the inlet of the engine, keeping compression inside by not allowing air out of the inlet between strokes. Performance reed valves usually have larger petals, made from Carbon Fibre rather than metal like original petals. The higher flexibility of the carbon fibre allows for greater responsiveness, with the larger inlet size on the petals complimenting the increased air intake of the larger carburettor.

The Malossi RC-One motor takes this to the next level. The RC-One is a replacement crank casing, which allows the Malossi Testa Rossa 94cc kit to be installed. This is one available on scooters fitted with Piaggio Hiper2 motors (without significant engine mount modification).

**ALL Scooter Tuning performance modifications listed here are for race use only. We accept no responsibility for incorrect or illegal use of parts that we sell** (Translation: Have fun, but be sensible)

Send messageSCOOTERSTREET.COM.AUFor the Scooter enthusiast. Our website offers quality
parts and performance for many popular scooter models.
Descriptions for each part and detailed articles on tuning.
The Youtube Channel is a great source of information
and is a must see. CLICK HERE to view!Recent ContentPiaggio Typhoon Tune Build Details. (BA430UU)Standard 50cc with 2000kms. History of derestri...Which 70cc Cyl kit fits the Euro 4 Typhoon / SRMT ?If you own a Piaggio Typhoon 50 or Aprilia SRMT...CUSTOMER SUPPORTFor all questions or enquiries:
Email: sa...@scooterstreet.com.au
One of our friendly staff will get back to you.
For Phone enquiries:
Purchase the Help Chat product and you
can be connected to one of our Tech staff.
Email: salesscoo...@gmail.comPRIVACY, DELIVERY AND REFUND POLICY

It's no secret that most large commercial trucks and some heavy-duty trucks have diesel engines. Why? Diesel engines generate more torque. Since a diesel engine doesn't have spark plugs and uses compressed air to ignite fuel, the piston (cylinder) has to travel a longer distance to compress enough air for ignition. This cylinder travel distance is called stroke, and more stroke means more torque [source: Mason].

Let's look at the differences between two truck engines. A Dodge Ram truck with a 6.7-liter Cummins Turbo Diesel engine has 350 horsepower and 650 pounds-feet of torque. The same truck with a 5.7-liter Hemi gasoline V8 engine, on the other hand, has 383 horsepower and 400 pounds-feet of torque. See the difference? While the gasoline engine has a little more power, the diesel's torque completely blows it away [source: Dodge].

While the two trucks have very similar towing capacities --15,650 pounds (7098.7 kg) for the gasoline engine and 16,350 pounds (7416.2 kg) for the diesel -- all that low-end power means the diesel engine will have an easier time towing things. Keep in mind that the diesel Dodge engine gets that much torque at only 1,500 rpm, which is just above idle. With a diesel engine, you won't have to rev up to start towing because the power already exists.

Because you're using more energy-laden diesel fuel, diesel engines get better mileage than gasoline ones, so you'll also be able to tow longer without stopping. At the same time, a truck with a gasoline engine is going to have a cheaper base price. Diesel engines almost always cost more than gas ones because they are built to withstand greater forces from a more potent fuel. A vehicle's towing capacity depends on many of its components, including wheels, tires, suspension and transmission [source: Haulmark].

Typically, the bigger the towing job, the larger displacement engine you will need. Towing puts a lot of stress on the engine, so more torque will reduce wear and tear on the vehicle [source: Sunrise Trailer Sales].

We've spent a lot of time and bandwidth comparing horsepower to torque. What's the verdict? In the end, all the evidence points to torque as being more important than horsepower when it comes to towing. Why? The power at low-end rpm provided by high levels of torque lets you move huge loads without much effort. As stated before, some diesel trucks produce twice as much torque as they do horsepower at near-idle RPM levels -- meaning that they can start pulling something like a trailer or a boat with ease.

The racing muffler is probably one of the most popular pieces of tuning no matter if you are looking at cars, motorbikes or scooters. It is also (at least for scooters) a relatively inexpensive way to really gain horse power and speed. On top of that the manufacturers have noticed that exhausts sell even better when they are homologated (this means legal to use on the street) using various performance restrictions. It is therefore perfectly legal to replace your stock exhaust with a racing exhaust if it comes with an ECE homologation.

c80f0f1006