Note: This kit requires 2 weeks lead time from order to shipping.
The full kit consists of a FORGED piston 86mm+rings, a honed cylinder paired with this individual piston, a full gasket set and a 16 teeth front sprocket (for higher top speed and lower rpm at higher speeds). We also throw in a set of aluminum swing arm bearing plugs. The gasket set includes one foot gasket, one metal head gasket and one exhaust gasket (copper ring).
This dyno chart shows the possibilities in terms of torque and RWHP (rear wheel horse power). With the concurrent use of a free flow exhaust and air filter as well as a well tuned ECU up to 31 RWHP have been reached with this set alone. With an additional performance camshaft (HT-b cam) the output rose to almost 34 RWHP which is equivalent to about 38 HP as Royal Enfield measures it (BHP – measured at the crank).
We do not have a dyno chart for this setup but our own acceleration tests show under 8 seconds to 100kmh with a 75KG rider.
Unlike the 477 set which will fit into the engine as-is this liner requires opening the engine block by 2mm or more to make it fit.
The widening of the engine body can be done very carefully with a dremel and oil soaked cloth stuffed inside the engine to catch metal pieces coming off. Run the engine with a magnetic oil plug to catch small stuff that may have slipped by. Use cheap oil and change after 50km driving – then again after 500km before switching to full synthetic.
There is a YouTube video from one of our customers who tested this setup:
We have produced a “how to” video available on YouTube which shows the entire procedure how to change the piston/cylinder combo.
Please read the FAQ dedicated to the 477 engine upgrade.