Unfortunately Frank Trost is no longer able to offer these cams but similar grinds are still available from Daryl Hutcheon at Professional Motorcycle Tuning in Melbourne on 0393304909. Call him for a price or to discuss your camshaft needs.

Camshaft grinds for XS650 engines in either standard ( 360° firing ) or rephased ( 270° or 277° firing ) configuration. 
Lift figures quoted are lobe lift not valve lift.

The first is just a stock cam for those not looking to hot up their beloved XS650 in either 256-00-360 (standard) and 256-00-270 (rephased) or 447-00-360 (standard) and 447-00-270 (rephased)
Check your manuals for lift and duration specs for standard grinds in 256 and 447 type motors.

The 256 cam specs are:-

Inlet valve opens 39° BTDC and closes 69° ABDC

Exhaust valve opens 69° BBDC and closes 39° ATDC

Lobe Centres are 105° and has .320" lift

256-01-360 (standard configuration) or 256-01-270 (rephased)

The 447 cam specs are:-

Inlet valve opens 35° BTDC and closes 73° ABDC                                

Exhaust valve opens 73° BBDC and closes 35° ATDC

Lobe Centres are 109° and has .320" lift

447-01-360 (standard configuration) or 447-01-270 (rephased)

The specs are:-

Inlet valve opens 24° BTDC and closes 64° ABDC

Exhaust valve opens 58° BBDC and closes 30° ATDC

Lobe Centres are 110° (inlet), and 104° (exhaust) and has .320" lift

256-02-360 (Standard configuration) or 256-02-270 (rephased) and

447-02-360 (standard configuration) or 447-02-270 (rephased)

For comparison here are the cams offered by Megacyle Cams in the USA.

Megacycle Cams

Monday, 28 April 2008