timing key in a 440

[mossracing47]

i am currently running a sparks timing key with my 416, but even with an aftermarket oil cooler and 11:1 piston in a 440 will heat still be a problem. if so are progamable cdi's that mess with your timing also a bad idea on a 440?

[SHADETREE101]

i ran it with a 426 and a 13:1 piton with no problems. a 426 would run hotter than the 440. it should be fine.

[400exrider707]

Sparks recommends to use his key on a STOCK engine only! Whether you choose to listen to him or not is entirely up to you.

[ckrown1]

i too run this key in my wifes 400ex. i put it in when it was a stock bore. we have since made it a 416 and i'll be removing the key this weekend to see the diiference,if any.i think i'll take sparks word for it.:D

[QuadJunkies]

Originally posted by 400exrider707
Sparks recommends to use his key on a STOCK engine only! Whether you choose to listen to him or not is entirely up to you. Thats TOTALLY CORRECT!! No WAY would I run that in my 440. I know someone else who ran one and eved up tkaing theres off too

[JOEX]

The key didn't work with my 416:ermm: