*The shape of the head of this product is larger than stock, and depending on the combination with suspension parts, there is a possibility that the head may come in contact with the tire. *The big bore and stroke of this product may result in increased vibration. *When installing this product, be sure to install an oil cooler and an oil temperature gauge to control the oil temperature.Continuous running at high temperatures (over 100°C) may damage the engine. *If the engine is used beyond our specified rpm range (MAX=14.000rpm), the engine may be damaged.
[Parts recommended for simultaneous installation] Racing outer rotor kit (73421) Middle weight outer rotor kit (73246)
[SOHC 2VALVE DYNA HEAD] The most powerful 2 valve engine!!!The characteristics change depending on the displacement.
[Engine Concept] The development of the engine started aiming at the strongest 2-valve engine in history, and it was born through the Mini-Moto SX competition.That's what "DYNA HEAD" is all about.Each displacement has its own unique characteristics to give the best performance.Despite its small displacement, the 88cc model boasts the most high-revving output characteristics of any model in the series.The explosive power at high rpm will captivate the rider.The "110cc model" tends to be thought of as a halfway house.This is a balanced engine that combines the characteristics of both the 124.8cc and 88cc models and blows up to high rpm with full torque.And the 124.8cc S PI model boasts the largest displacement.This is the low-mid speed type for best performance in touring.It has overwhelming torque at low rpm and you can enjoy long distance driving without stress.The 124.8cc DRAG V er.2 model is the most powerful race engine in the series, with enhanced high-rpm characteristics and a higher rpm limit.
[Valve layout] Large diameter narrow angle valve layout to achieve straight intake and exhaust ports for high rpm and high power output.Valve Diameter: IN Φ28 / EX Φ23.5, Stem diameter Φ5 (Waist part Φ4.5) Valve pinching angle: IN 22.0° / EX 25.5°.In addition, the narrow-angle valve layout realizes a combustion chamber with a low S / V ratio and efficiently converts the intake air mixture into power.
The camshafts provide a wide power band for increased torque in the mid-range and more power at higher RPMs.Our goal was to create a "fast running" engine that does not show up on the graphs.The rocker arm uses a roller rocker to reduce friction loss.The material is made of steel for strength and durability.
[Ceramic-coated cylinder] φ54 ceramic coated cylinder with excellent wear resistance, lubrication, durability and seizure resistance is adopted.When combined with the included long-stroke crank, the engine displacement is 124.8cc, which is the largest in the class 2 moped category.
Highest peak 2-valve head kit (124.8cc) with optimized intake & exhaust ports (hand finished port machining).GP valve springs are set to suppress valve surging in conjunction with DRAG's exclusive high-revving racing-spec camshafts, which are designed for high-revving engine characteristics.In addition, a forged piston with cooling fins on the backside of the piston and a special head gasket have been used to achieve a compression ratio of approximately 13.0:1 to achieve the strongest power of the 2-valve head!The left side head side cover and tappet cover are made of DRAG's exclusive aluminum billet (black anodized finish).
The DynaHead Drag Version (former 71624) has been renewed as "DynaHead DRAGVer.2 High RPM Racing Specs" to further improve quality.Forged pistons and piston pins (same as 74012) and NEWSP crankshaft (same as 72879) with improved durability are newly adopted to further increase strength and reduce weight.
●Must be installed with DAYTONA PA Racing Outer Rotor Kit (73421) or MID Outer Rotor Kit (73246). ●It is recommended to install with DAYTONA's secondary clutch kit (various types) at the same time. ●Before installing this product, perform crankcase boring (56.6.56.8mm, depth 27.0mm) and make preparations such as replacing parts that need to be installed at the same time before assembling the crankcase (below the waist).DAYTONA does not provide crankcase boring.Please contact a specialist. ●Please use a plug of the same shape as the stock plug with a heat value of 7 or more.Stock plugs cannot be used. ●Compression ratio is about 13.0.
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
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