aluminium pushrods in the Royal Enfield give about 0.2~0.3mm clearance between cold and hot engine when using original CI cylinder barrel.
with the aluminium barrel this grows to about 0.7mm with hot engine. makes you think how much tighter the head bolt tension get at hot engine...
also the mechanical noise with a CI barrel is far less than aluminium barrel...
pushrods are enclosed inside the barrel like many brit engines were at the time.
pushrods are hollow aluminium 10mm x 2.5mm with hardened hollow tips and ¼" adjusters (the indian versions later went on to M6 adjusters somewhere early this millennium). length is about 225mm exhaust, 215mm inlet.
then later models went to ball-tipped pushrods.
with the aluminium barrel this grows to about 0.7mm with hot engine. makes you think how much tighter the head bolt tension get at hot engine...
also the mechanical noise with a CI barrel is far less than aluminium barrel...
pushrods are enclosed inside the barrel like many brit engines were at the time.
pushrods are hollow aluminium 10mm x 2.5mm with hardened hollow tips and ¼" adjusters (the indian versions later went on to M6 adjusters somewhere early this millennium). length is about 225mm exhaust, 215mm inlet.
then later models went to ball-tipped pushrods.