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Replica Piston kit; Kit includes: Piston, rings, pin, clips
For Models:
2003 - 2004 KTM 250 SX
Technical Specifications:
Compression Ratio (x:y): STD
Cylinder Diameter (mm): 66.40
Displacement (cc): 250.00
Piston Diameter (mm): 66.35
Part # 22909B
Normal Retail: $136.01
Who is Vertex? It's worth the read......
-OEM for KTM
-World Championship Racing
-Rings are direct OE replacements
-MOS2 coating eases break-in and adds lubricity
-The Future of High Performance Pistons Available Today
Vertex was founded in 1953 as a workshop to produce spare parts for agricultural engines and pumps. Vertex is a Latin word that means, 'Top' or 'Summit'. The lead engineer was the headmaster of IPSIA, a secondary technical school in Reggio Emilia. In 1972 Vertex purchased technical information for piston production from a famous Germany piston company. This permitted Vertex to upgrade their internal standards in materials, heat treatments, and piston profiles. Another milestone of our history occurred during 1980, when Vertex was purchased by the famous Reggio Emilia Group. The new group partnership immediately gave Vertex additional financial capability to sustain its development. In following years, Vertex has become the leading piston supplier for all European go-kart, scooter, and motorcycle companies. Within a short period of time, Vertex considerably increased its market share. Also during 1992, in collaboration with many famous European motocross teams, Vertex technicians started to release new pistons manufactured with exotic materials and engineered with hi-tech profiles. Success within the racing community came immediately. In 1993 a Yamaha official factory bike with a Vertex piston won the 125cc Motocross World Championship title. Engineering collaboration with Official Top Teams resulted in a long series of World Championship titles. During 1995 Vertex started its relationship with KTM, supplying them with the 125cc and 250cc two stroke pistons for the official Motocross and Enduro teams. Success came immediately with several 125cc and 250cc World Championship titles. Soon following, Vertex became the OE supplier to KTM. In 1997 Vertex received the DNV ISO 9001 certificate. This certification demonstrated Vertex's high technical and quality piston production capabilities. In 2003, the internal quality standards have been upgraded to ISO 9001/2000 certifications. Also in 1997, Vertex started its American adventure in collaboration with the Kawasaki and Pro Circuit race teams. This was another occasion where Italian technology combined with US motocross teams, resulted in the 1997-2004 two-stroke 125cc and 250cc AMA Motocross Championship titles. On September 1st 2000, Vertex Pistons was purchased by a US corporation and merged its Italian division. In 2005 and 2006, racing success continued with the AMA Championship title in a 250cc four-stroke. Today with skilled employees and modern equipment, Vertex Pistons, Inc. is a world leading company for cast and forged piston production. Vertex Pistons, Inc. also supplies pistons to the most significant European OE Powersports companies. Additionally, pistons are shipped through a global distribution network, satisfying the needs of motorcycle enthusiasts and professional racers all over the world.
General Questions
What size piston do I need?
If you are just replacing the piston, then you need to first know the bore of the cylinder. This can be done by using a bore gauge to find the diameter or by reading the owner's manual to find the bore specifications. Ultimately, the bore should be measured for the best possible results. After the diameter is known, then you can pick which size piston will work best in your cylinder. Remember to maintain about a 0.05mm (0.002") piston to cylinder clearance, depending on application. If you are having a cylinder re-plated, then you will want to choose a piston of the OE bore size (an A or B size is probably best). When you send the piston and cylinder away to get re-plated, the plating facility will match the cylinder bore to piston diameter. If you have a cast iron bore cylinder and you are sending the piston and cylinder off to a machinist to be bored out, then you will want a piston that is oversized from the current diameter. For example: If your current bore is 64.00mm, then you will want to choose a 64.50mm or similar oversized piston. The machinist boring the cylinder will bore and hone the cylinder to match the piston size.
Why does Vertex offer A, B, C, and D piston sizes and what is the difference between them?
Vertex offers A, B, C, D, sizes so that the customer can properly fit each piston to the cylinder. The difference in the sizes is 0.01mm (0.0004") increments with A being the smallest and D the biggest. When a cylinder wears, the customer can choose the next larger piston size to regain the proper factory fitment. As a general rule use the following: A (0 to 50 hours) B (50 to 100 hours) C (100 to 150 hours) D (150-up hours)
Are Vertex pistons cast or forged?
Vertex pistons are both cast and forged. Vertex casts their two stroke pistons because of the ability to incorporate higher silicon content into castings as opposed to a forging. This gives the piston a lower thermal distortion characteristic and higher wear resistance. Vertex uses castings and forgings in its four stroke pistons depending on application. Low rpm, low performance four stroke engines can use cast pistons. High performance, high rpm engines (like today's race bikes) use forged pistons for strength. Vertex has the ability to manufacture its pistons to suit each need.
**Please note that all photos are for REFERENCE ONLY, please read description for full details. Part numbers are as sold from manufacturer. |
