125 6B Nine Port Cylinder

[JP Morgen]

http://patineto.smugmug.com/MorgenMachine/Motorcycles/Engine-work/37072884_Zb8Dt8#!i=3077711353&k=KF8J3sP

Finishing up this cylinder, aluminum liner to get plated with Nicasil. Two extra boost exhaust ports and four boost transfer ports. If you want to know how much to duplicate, you can't afford it! Just kidding, but it would be very expensive.

[Dwight Rudder]

The question is how will it perform compared to the stock cylinder.

[gooddirt]

Super Sonic! JP.... and run some ceramic main bearings if you are going all out!:D

[joe novak]

IMO- the extra ports are not as significant as the restricting carb intake and exhaust ports.   joe

[gooddirt]

JP's famous for making 30 hp on the bench; One-Off Sachs race motors. Or was it the 1974 cr125 Honda motor with all those ponies ?

[JP Morgen]

Not visible in the photos is the modified intake, shortened and taken out to a full 32mm inside diameter. Believe it or not the standard 125B exhaust timing is the same as a 2003 KTM 125SX!