Yamaha XS650 

"707cc" Bigbore Kit 10.2:1 Compression Ratio

   Two quality high silicon aluminum pistons with rings imported from Japan and process coated in Canada. 78mm pistons complete with full floating wrist pins, clips and a special .016" thick copper head gasket. For all 447 engine models 1974 to 1984. Each set is blueprinted and weight matched during our process. Quality is guaranteed. Piston domes are coated with CBC1* thermal barrier and skirts with DFL1* high pressure dry film lubricant. Coatings are heat cured. Pins are coated with PKSX* dry film. These coatings really work. More cc's, less friction, better combustion equals more horsepower. 

The only machining required is to bore and hone your existing cylinders to accept the 78mm pistons. 

New cylinder sleeves not required.  

"SPECIAL NOTE"

Camshaft sprocket needs to be adjusted -2 degrees to compensate for the thinner copper head gasket

Fit for Yamaha

XS650 74-84

Installation instructions and bore surface finish recommendation included

 

   Coatings manufactured by TECH LINE*      

CBC1*

  - ceramic thermal barrier coating

   - Reduced piston temperature. Keeps heat in chamber longer, through the power stroke 

   - Increased torque and H.P. Increased combustion chamber efficiency.

   - Reduced fuel consumption.

CBC1 is thermally cured metallic ceramic coating designed to be used on either cast iron or aluminum combustion chamber surfaces. CBC1 is formulated to be used in all engines, both 2 and 4 stroke. CBC1 provides a hard, durable thermal barrier overlay to any component. Provides reduced part temperature, resistance to detonation, increased combustion chamber efficiency. More efficient oxidation of fuel also occurs, leading to increased power output. CBC1 allows minimal transfer of heat through the coated surface thus reducing part operating temperature. In general coating the combustion chamber surfaces will allow you to run less initial timing with no loss of power (usually a gain will occur). You may also be able to run significantly less fuel. You should be able to run smaller jet sizes. Obviously no specific recommendations can be made as every engine combination will be different. Testing has shown significant power increases on a dyno. In addition certain changes can be made in such areas as tolerances, timing, jetting, that will increase torque and H.P. and are only possible through the use of coatings. Horsepower gains in excess of 15% have been measured in independent dyno testing.

DFL1*

- high pressure lubricant with extremely low coefficient of friction

- reduces friction, galling and scuffing

- increases part life from up to 10 times

- ideal for piston skirts, cam lobes and any part subject to sliding or rotating friction

DFL1 is a thermally cured Dry Film Lubricant. DFL1 makes use of a unique binding system, to retain high temperature stability while reducing friction. The film thickness of DFL1, as applied, ranges from .0005" to .001".The lubricating ingredients in DFL-1 can lubricate at pressures above 350,000 psi. Part life increase is a benefit.  Life increases from two (2) to ten (10) times what is normal can be seen.  The dry film lubricants may burnish until they are no longer visible, however, the active materials are bonded into the pores of the part and continue to provide protection.  Parts will run cooler. Engine oil temperatures have shown a reduction. DFL1 is a primarily a high pressure lubricant and is recommend for use on any part subject to sliding or rotational friction. Camshaft assemblies, piston skirts and bearings all benefit from application of DFL1.