PDA

View Full Version : 70cc spark plugs

hybridrazz
12-17-2004, 01:10 AM
Which plugs are you guys using the (BR7HS stock) or the (BR9HS 70cc)?
hybridrazz
12-17-2004, 01:11 AM
isnt the BR9HS a colder plug then the BR7HS? I was thinking the higher the number the colder the plug.
XPS1210
12-17-2004, 01:55 AM
you should run the 9 heat when using a 70cc kit...

A 7 heat is for the stock 50cc set up...
hybridrazz
12-17-2004, 02:10 AM
thanks jered for the info is the 9 a colder plug?
XPS1210
12-17-2004, 02:23 AM
yes... the 9 runs cooler than the 7 heat plug...
hybridrazz
12-17-2004, 02:32 AM
humm i was still using my factory plug which was a 6 so that's even hotter could i get a little more power switching to the 9? The 6 i was using has the coffee brown color.
SychoSly
12-17-2004, 04:39 AM
Are the NGK's that are sold on Provo pre-gapped? Or would we have to gap them ourselves?

Thanks.
XPS1210
12-17-2004, 05:11 AM
it's not a matter of power from the plug... it's how HOT the plug gets...

a 6 instead of a 9 plug... probably means your piston has been to hot... possibly causing the cylinder or piston to have damage!
hybridrazz
12-17-2004, 11:34 AM
ill be ordering from provo soon then the 6 plug was in my razz i was still using the 7 plug in my zuma. All the ngk plugs ive got from my dealer werent pre-gapped even if they were if, it would good to check the gap just in case never know.
XPS1210
12-17-2004, 05:25 PM
oh yeah... they are pre gapped but you should check em as they can get messed up in the mail...
SychoSly
12-17-2004, 07:15 PM
oh yeah... they are pre gapped but you should check em as they can get messed up in the mail...

What are they supposed to be gapped to?

Thanks.
rydah
12-17-2004, 10:56 PM
check your cylinder instructions, it should be there.
SychoSly
12-18-2004, 05:41 AM
check your cylinder instructions, it should be there.

My Cylinder kit didn't come with instructions. I just recieved the hardware.
hybridrazz
12-18-2004, 09:37 AM
My polini kit didnt say how much to gap my plug either, just what plugs to use, i went by the factory specs of 0.38 to 0.43 ive got mine gapped at 0.40 i would check your zuma owners manual,and see what it says should be about 0.40.
SychoSly
12-18-2004, 10:36 AM
My polini kit didnt say how much to gap my plug either, just what plugs to use, i went by the factory specs of 0.38 to 0.43 ive got mine gapped at 0.40 i would check your zuma owners manual,and see what it says should be about 0.40.

The service manual says the gap should be:

0.6 - 0.7 MM ( 0.02 - 0.03 IN)

But wouldn't we use a different gap for the 70CC setup?
hybridrazz
12-18-2004, 10:43 AM
Humm well there is more compression with the kits,so a stronger spark could make it run a little better, but i dont think making the gap a little wider would make that much of a diffrence with the factory coil, lennox was saying he couldnt really tell any diffrence with the racing coil he has. That gap that your manual says is only 0.24 to 0.28 hum alot smaller then mine,so the 0.40 for you would be way too much.Sry about the 0.40 i didnt realize i was lookin at my razz manual instead of my zuma manual.