Sparks timing key no good on a 416ex?

[badk1dizsik]

I was just reading that you dont want to put a sparks timing key on a 400ex that has a big bore kit on it because a oversized piston can result in overheating. I'm still a newbie to quads and dont no why that would happen and why I couldn't put this on my 416ex...Could someone please explain?

Thank You!!!

[tri5ron]

as long as you are 11:1 compression, or less...
you'll be fine.

it's not a matter of displacement, 416, 426, 440.....
it IS a matter of compression.

[BigBore24]

tri5ron do you think i would notice a big difference with my quad with a timing key. i also always heard they werent recommended for big bores but glad to know it isnt necessarily true

[tri5ron]

as long as your 11:1 or less, your 416 will liven right up with the advance key.
go read my how to here...
http://www.exriders.com/vbb/showthread.php?s=&threadid=349499

416 is not that much of a overbore from stock anyway.

get the key, you will certainly be pleased with it.

Remember, it's not the bore that matters,..
it's the compression.

[XXXRACER165]

Originally posted by tri5ron
as long as you are 11:1 compression, or less...
you'll be fine.

it's not a matter of displacement, 416, 426, 440.....
it IS a matter of compression.


Actually the advance key along with more compression will run better (with race gas). My buddies friend has a 450R with 13:1 compression piston and an advance key, pure & simple thing hauls @$$.

[lorenjr83]

Originally posted by XXXRACER165
Actually the advance key along with more compression will run better (with race gas). My buddies friend has a 450R with 13:1 compression piston and an advance key, pure & simple thing hauls @$$.

450R- liquid cooled, extra heat not that much of a problem compared to the air cooled 400ex

[tri5ron]

Originally posted by XXXRACER165
Actually the advance key along with more compression will run better (with race gas). My buddies friend has a 450R with 13:1 compression piston and an advance key, pure & simple thing hauls @$$.

No offense intended here,...
Your trying to compare Apples to Oranges