13 second engine in detail

Due to the show this was put on the back burner for a while, if you go back through our posts you will notice that we went through 2 engines in the process of making this!.

So lets take a look at the finished engine shall we.

Powder coated the cases gunmetal and applied ceremic coating to the cylinder and head, though heat isnt an issue for us as its only going to do 2 runs before being shut down.
The transmission side of the case has been drilled out to save a little weight............ we learnt our lesson last time and have added a CNC swingarm to help strengthen it, the swingarm weighs about 600 grams so its not really a big deal.

Here we have the samurai bell and the koso race clutch installed behind it, in my experience these 2 are the best combo on the market, shame the KOSO is next to impossible to pick up anymore.

CNC cooling fins with a breather tube attached, this will run along the inside of the frame rails to release excess pressure, though not pictured we are using a KEIHIN PWM38 carb with a HKS air filter.

CNC machined flywheel with custom timing, cylinder has built in passages for the oil cooler, other than that nothing special going on here.

Our swingarm as mentioned before.

Heres the other side in all its glory.

Now i cant say who this engine belongs too, but it will be raced this summer in a major event, im hoping to break the low 13's possibly the 12's if we get the gearing right, this would set a new record for a 4 stroke 125 scooter engine.

Inside is a huge 75mm piston with a very long stroker crank ( i forget check my previous post! )
The head has a proper 5 angle job with titanium retainers and stainless valves (again huge).
The engine requires over 100 octane gas to avoid detenation and its so fast we have to change the belt after a few runs.

Well hope you enjoyed the photos, i didnt get the Titanium exhaust out because its all wrapped up ready to ship.