how do i keep cam timings when removing both heads

Originally Posted by yorkie_chris

There is no guaranteeing that chain lands on same tooth of crank sprocket, or which side slack lands on.

I'd always recommend double checking the alignment after everything has been put back together, and then checking it again just to be sure. Then once you're happy it's right, turn the engine over slowly by hand to make sure there's no contact anywhere.

Originally Posted by yorkie_chris

Better IMO to do it the slightly more long-handed way.

I like to cable tie the sprockets on because I'm dyscalculaic and easily lose count when finding the sixteenth pin. Having removeable sprockets makes this a damn sight easier

Originally Posted by yorkie_chris

Pressed-on sprockets are nothing new?

I know that, seen a few pressed on type - doesn't make it any easier when you want to reassemble an engine though.

[yorkie_chris]

Less to get wrong if the sprockets have any adjustment and aren't dowelled in place.

Originally Posted by yorkie_chris

Less to get wrong if the sprockets have any adjustment and aren't dowelled in place.

99.9% of road bike cam spockets are not slotted and totally unadjustable. Most will only fit on the cam the one way too. The potential for getting it wrong is minimal, but there's no accounting for the numptiness of the inexperienced mechanic.