The stock 1200 motor mount rubber starts tearing at the top edge, when you rev the motor you can see a 1 then 2MM gap open up.......not long after they fail. Over the last 20 years I've changed 3 sets, mind you here in Vegas the pizza oven weather tends to bake and crack all things rubber and plastic.
Not a biggie to change the mounts, hopefully the next autocross will work out better. I recently aquired some of the Blu-Alu spring retainers (they are for race springs, used to be on the Motorsports catalog) and some tuliped 37mm & 30mm valves.....neat suff.


Tom

so phuck it no need for l series valves. im not to worried about it. well i went to go autoex the car today and turns out i broke both motor mounts on first run :(

Yeah there a15 sizes allready

Those are bigger than GX valves which were 35/29.

i measured them before i put head on at a friend place. 30mm on exhaust 37mm on intake.

Verry true. Idearly you want the nearest edge of the valve the same distance from the cylinder wall as the lift so you can hav the ortimul radius from the seat to the wall

But do larger valves help? Or hurt? If you go too big and get them to close to the cylinder walls the reduce effictiveness. Only a dyno would tell.

pretty sure thats right A14force. ya can go even bigger with reduced Lseries valves, and I'm looking into some 350chev Ti blank's.

I think they're 1mm bigger on the exhuasts, and 2mm bigger on the inlets, but I remember exactly off hand.

how much bigger are they ? This was a budget build, i have about 500 into it with everything. gasket kit, rings, lightening the flywheel, new chain/sprockets and tensioner, bike carbs, header.. so yeh it is night and day to my a12.. if i pull apart again i will do the valves.