Engine Information – X30 Asphalt (2023)

Engine Information – X30 Asphalt (1)

technical specifications

Bore Diameter: 54.00 mm
Stroke: 54.00mm
Displacement: 125 cubic centimeters

Induction: Reed valve

Cooling: water cooling

Carburetor: Tillotson HW27A or Tryton 27
Maximum horsepower: 30 HP between 11.000 and 11.250 rpm
Maximum torque: 19.5 Nm between 10.250 and 10.500 rpm
Drive: dry centrifugal clutch
Fuel: Premium Unleaded
Blend: 16:1 – 25:1 Castor Oil

Weight: 12 kg without accessories

Maximum RPM: 15800 RPM limit

Starting: On-board electric starter


reed valve

Reed valves require regular inspection as they are prone to cracking or chipping.

3 sessions

Gear oil, this involves checking the oil level through the 14mm brass bolt on the front of the engine.

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Bendix Drive, the flex area tends to collect dust which in the long run will impair the bendix's ability to start the engine. Cleaning requires removing the plastic clutch cover and elbow cover and spraying some degreaser while using compressed air to clean the area

Clutch, the clutch should be serviced every time the front sprocket is changed. At this point the clutch bearings should be replaced or re-lubricated, the inside of the drums should be cleaned with brake cleaner and if needed, the clutch pads should be cleaned with 800 grit sandpaper or scotch brite

3-6 meetings

Carburetor and carburetor maintenance are both factors of use and time. If you haven't used your engine for a while, you'll need to service your car, even if it hasn't been used very often. Carby repairs will require replacement of the diaphragm in basic service down to the needle and seat, or other parts of the carby, to restore it to original condition.

5-15 sessions

During this time, the engine will need a high-end makeover. Depending on the level of racing you are at, the piston and rings, small end bearings, piston pins, o-rings and gaskets will need to be replaced. A general sign that your engine may need a top-end rebuild is that you may notice a drop in bottom-end power from the engine. The engine should not exceed 10 hours before performing a high end rebuild.

30-45 sessions

During this time, your engine will need a major rebuild. This includes top end rebuild as well as replacement of connecting rods, big end bearings, crank pins, thrush washers, main bearings, seals. The engine should not have had more than 30 hours prior to performing this service.

Torque value

Head and cylinder nuts 13-16 ft-lbs/18-22 Nm

Carby retaining nut/stud 6-8 ft-lb / 8-10 Nm

Ignition Rotor Nut 14-19 ft-lb/20-26 Nm

Clutch drum nut 22-29 ft-lb / 30-40 Nm

Starter Ring Retaining Nut 73-80 ft-lb/100-110 Nm

Spark Plugs 14-19 ft lbs/20-26 Nm

Exhaust Nut 13-16 ft-lb/18-22 Nm

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Run-in procedure

The running-in of the engine must follow some basic rules:

  1. Adjust the carburetor. Start with adjustments on the rich side.
  2. Gradually warm up the engine at half throttle for about 10 minutes, drive a few laps at low speed, and gently turn the carb off and on. Throttle (if a tachometer is fitted, never exceed 11.000 ÷ 12.000 RPM). Never keep the same RPM for a long time.
  3. Increase speed at 3⁄4 throttle opening for 10 minutes. Never keep the same RPM for a long time.

4. Add 10 minutes at maximum speed. Accelerate through the twisty sections of the track and get the engine rich on the half-straight (immediately cover the hole in the air filter with your hand, keep the throttle wide open).

After the break-in is complete and the engine is cool, check the torque of the exhaust header nuts, as the nuts tend to loosen during the break-in process.

Lightning Karts also offers dyno break-in classes so you can pick up your engine, crank it up and start racing. Whoever built it, we're happy to provide this service to save you valuable time on the track.

jet setting

Tillotson HW27A Carburetor

X30 & TAG open

L = 1 hour 5 minutes to 1 hour 10 minutes

H = 1 hour 25 minutes to 1 hour 30 minutes

Recommended shot settings for the Tillotson HW27A carb are 1 hour 5 minutes to 1 hour 10 minutes (low) and 1 hour 25 minutes to 1 hour 30 minutes (high). The pop-up pressure should be set at 10psi and the lever height should be flush with the body of the gauge using the 37g inlet spring.

label restrictions

L = 1 hour to 1 hour 5 minutes

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H = 1 hour 15 minutes to 1 hour 20 minutes

The recommended shot settings for the Tillotson HW27A carb are 1 hour to 1 hour 25 minutes to 1 hour 30 minutes (low) and 1 hour 15 minutes to 1 hour 20 minutes (high). The pop-up pressure should be set at 10psi and the lever height should be flush with the body of the gauge using the 31g inlet spring.

Triton carburetor

L = 1 hour 5 minutes

H = 1 hour 5 minutes

The recommended jetting settings for the Tryton carby are 1 hour 5 minutes on low and 1 hour 5 minutes on high, depending on location and climate it may be necessary to deviate slightly from these settings. Once you find your sweet spot, you rarely, if ever, need to make much adjustments based on it.

Suggested popping pressure is 8.5-10psi, depending on location and climate, usually 10psi is a good starting point. For lever height, it's best to start with the bottom of the lever level with the body of the carburetor, and if the carby feels like it's running out of fuel, try raising the lever further.

*Keep in mind these settings are a basic starting point, different weather conditions, fuel types and fuel qualities may require fine tuning from the above settings.

muffler elastic

Original straight mufflers and headers

IAME conducted extensive testing when developing the X30 engine, so recommended settings are 435mm to 445mm for high-speed tracks and 445mm to 455mm for tighter tracks. This is the measurement from the flange to the first weld on the muffler. It usually corresponds to a bending length of 50 mm to 70 mm. The rule of thumb for flex is that shorter flex will make more power in the higher RPM range, and longer flex will make more power in the lower RPM range. 5mm increments will be fine adjustments, while 10mm increments should make a noticeable difference.

Engine Information – X30 Asphalt (4)

New 2020 Curved Muffler

The 2020 muffler no longer uses flex, but instead comes with a 3mm aluminum spacer that fits between the cylinder and exhaust manifold.Installing this 3mm spacer is equivalent to adding 10mm of flex to the old muffler.

spark plug

Recommended plugs are as follows

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NGK – B10EG, BR10EIX or B10ES. In colder conditions, a 9.5 thermal plug can be used

Denson I31. In colder conditions, a 29 thermal plug can be used

fuel ratio

The IAME X30 can run between 16:1 and 25:1, but we recommend 18:1 for most oils. To determine the correct amount of oil, use our oil/fuel ratio chart.

Click here to view oil/fuel ratio chart

Recommended Oils and Fluids

We recommend the following oils for X30 engines – Castor Oil


Shell Racing M or Maxima Caster 927

Gear oil - about 40ml, fill until oil comes out of the front level plug

Parilla Gear Oil, Maxima Gear Oil or XPS/Xeramic Gear Oil SAE 30


Maxima Cool-Aid Radiator Coolant

Force diagram

range of rotation

The X30 ignition has a rev limiter that engages at 15,800rpm. It's a soft-cut limiter that works by retarding the ignition to the point where the engine is no longer producing power. Since it's a soft-cut limiter, it's not uncommon for the engine to rev above the limiter on draft or at the end of long straights when using high gearing.

Engine Information – X30 Asphalt (6)

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How much horsepower does the x30 engine have? ›

Basing off the specs of the engine, when compared to the Rotax and ROK engine, the X30 only has 28 horsepower, compared to that of the Rotax which has 30 horsepower, and the ROK which has the most horsepower topping out at 36.

What is the difference between IAME x30 and Rotax? ›

A rotax is much more cost effective to run, a 50hr rebuild interval vs less than 10hrs for the x30. The Rotax is also much more robust and reliable, with really good midrange. So much so that in medium speed corners you are able to steer the kart more with your feet compared to the x30.

How much horsepower does a IAME x30 senior have? ›

Max Power: 28 Hp (21 Hp ) at 11.750 Rpm. Max Torque: 17 Nm (13Nm) at 10.750 Rpm. Max RPM Limit: 16.000 Rpm (Rpm limiter)

How much HP is the Predator Ghost engine? ›

15.8 HP (459cc) Max Performance OHV Horizontal-Shaft Gas Engine,...

What's the difference between a Rotax engine and regular engine? ›

AMT: What makes them different? Vogel: Well, Rotax engines use liquid cooling to keep their size and weight down. They have five-piece crankshafts, rather than the traditional one-piece forging used in most aviation engines.

What is special about a Rotax engine? ›

The Rotax engines are very smart, with dual-path [engine control units] controlling the fuel injection. This allows for fully automated precise control over the fuel mixture which improves fuel efficiency, reliability and longevity providing super-efficient lean of peak operation.”

What are the advantages of Rotax engine? ›

This technology allows a perfect reproducibility of the cylinders, while keeping the advantage of a quality coating. You can see the reliability of a Rotax engine. Moreover, the machining of the parts is carried out on numerically controlled machines, and allows to obtain the sporting equity of your go-karts!

Where are IAME engines made? ›

Built on a tradition of excellence which is based on a knowledge of 50 years, IAME engines are now considered among the most reliable on the market, entirely produced and assembled in Italy.

What is the fuel mixture for the IAME X30? ›

Fuel mixture 98 RON and oil 5% (20:1) minimum.

How fast does a Rotax Max engine go? ›

Top Speed: 60mph

The 2 stroke 125cc water-cooled Rotax Max TAG (Touch and Go – electric start) categories are now the most popular classes in the UK.

How much HP does a fully built Predator 212 make? ›

Predator Engine 212cc (6.5 HP) Harbor Freight.

How much horsepower does the Briggs World Formula Engine have? ›

The World Formula has 14 hp with a 7100 rpm ignition. The World Formula is a spec motor package that you can change some spec to meet minimum such as deck the head or the block.

How much HP does a Stage 2 Predator have? ›


What is the most horsepower engine ever built? ›

At 13.5 meters tall, 26.59 meters long and weighing in at over 2300tons, the Finnish-made Wärtsilä-Sulzer RTA96-C is the largest internal-combustion engine ever produced and pumps out a whopping 80.1MW (107,390hp). This colossal creation is responsible for powering one of the biggest container ships ever made.

How much HP does a Rotax Mini Max have? ›

The Rotax Mini Max is designed to produce a progressive power band and adaptable power for younger racers. Producing approximately 13 hp at peak performance, the Micro Max can propel a cadet / mini size kart to approximately 65 mph on large tracks.

What is the world's highest HP engine? ›

The RT-flex96C is a true giant among engines, with its fourteen cylinders that can generate 107,389HP with more than 7,000,000Nm of torque — enough to power an entire suburban town. The engine weighs 2,300 tons and stands 44 feet tall and 90 feet long – more than a four-story building.

How much horsepower does a Rotax Max engine have? ›

24 kW (32 hp) at 11,500 rpm. Maximum rpm 14,800 rpm. recommended as of 14 years (13 years if the driver turns 14 in the season) has a cylinder with exhaust valve.

What is the biggest street legal engine? ›

1. SRT Viper: 8.4-liter, 640-hp and 600 lb-ft V-10. The biggest engine available in the U.S. belongs to an American supercar -- and all remains right in the world. The Viper's 8.4-liter V-10 makes an impressive 640 hp and 600 lb-ft of torque.

What is the largest engine in a street legal car? ›

Currently, the largest car engine available on a production car is an 8.4-litre Viper V10 engine produced by Chrysler, which has been responsible for some of the most insane performance engines of all time, including the Chrysler Hemi.

How long does a Rotax Max engine last? ›

The Engine

The Rotax Max engine revolutionised karting by introducing performance, reliability and Touch and Go (TaG) into one package. In its senior configuration the engine produces around 30bhp with a service life of around 20-30hours.

What is the fastest stock engine? ›

The 1,914 hp Nevera is currently the world's fastest-accelerating production car.

What street legal car has the most horsepower? ›

Most powerful production cars
Rimac Nevera/Pininfarina Battista20221,408 kW (1,888 hp; 1,914 PS)
Hennessey Venom F520221,355 kW (1,817 hp; 1,842 PS)
SSC Tuatara20221,305 kW (1,750 hp; 1,774 PS)
Koenigsegg Gemera20231,268 kW (1,700 hp; 1,724 PS)
36 more rows

What is the most powerful engine on earth? ›

The Wärtsilä RT-flex96C is a two-stroke turbocharged low-speed diesel engine designed by the Finnish manufacturer Wärtsilä. It is designed for large container ships that run on heavy fuel oil. Its largest 14-cylinder version is 13.5 meters high, 26.59 meters long, weighs over 2,300 tonnes, and produces 80.08 megawatts.

Who makes the Rotax engine for Can Am? ›

TypePrivate company
ProductsInternal combustion engines
OwnerBRP-Powertrain Management GmbH, BRP Holdings (Austria) GmbH
ParentBombardier Recreational Products
4 more rows

What is Rotax most powerful engine? ›

Rotax 850 E-TEC Turbo R with Water Injection

The most powerful factory-built 2-stroke snowmobile widens the gap on the competition. Heart pounding power, response and mind bending acceleration in your hands.


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