07trx400ex
04-22-2008, 05:53 PM
There must be a reason that most of the 450's use shims/bucket style.
Why would most of the 450's use this system?
It seems as if the answer would correlate to the use of a "slipper piston".
A quick overview of the Bore/Stroke of the 450's revealed that they all have a substantially larger bore than they do stroke, except for the KTM and Polaris.
This makes me draw the conclusion that the Bore/Stroke dictates the type of valves used.
Bore/Stroke and type of valve actuation:
Honda TRX450r: 96x62 / shims/bucket
Suzuki LTR450R: 95.5x62.8 / shims/bucket
Yamaha YFZ450: 95.0x63.4 / shims/bucket
KTM 450 XC: 89x72 / screws/tappet
Does anyone have anymore info on this?
Why would most of the 450's use this system?
It seems as if the answer would correlate to the use of a "slipper piston".
A quick overview of the Bore/Stroke of the 450's revealed that they all have a substantially larger bore than they do stroke, except for the KTM and Polaris.
This makes me draw the conclusion that the Bore/Stroke dictates the type of valves used.
Bore/Stroke and type of valve actuation:
Honda TRX450r: 96x62 / shims/bucket
Suzuki LTR450R: 95.5x62.8 / shims/bucket
Yamaha YFZ450: 95.0x63.4 / shims/bucket
KTM 450 XC: 89x72 / screws/tappet
Does anyone have anymore info on this?