I have a rcgf 45cc engine & was told by the man it takes a cm6 spark plug. The plug thats in it now is way bigger than a cm6 plug. Does anyone have some info for me.......thanks

Hallo Dave,

Who told you that the engine has a Cm-6 plug?
It dose not. the plug you have got in there will work fine. If you would like to replace it, get a NGK BMR7A

double post [:@]

My RCGF 45 has a brass adapter in it so it will take a cm6 plug. I guess it depends what distributor you got it from.

I also got mine from a fellow on rc universe who said he got it from henry. ?????????????

I know mine came from Henry because it came with all the original manuals and paperwork with the RC Aero letter head on it. Strange thing about mine is the stock muffler doesn't fit.
I don't know if Henry ever sold any without the plug adapter in it.

The NGK BMR7A sparkplug has a 14mm thread and the CM6 has a 10mm thread.
Below picture of the 14mm to 10mm plug bushing that is in my 45cc.

interesting, thanks for the photo. I guess they had a reason to go with an adaptor & cm6 plug. maybe that plug makes it run better than the BMR7A. how many rpm did you get after the re-tune.......

Heads up on the RCGF 45 engine. Was running my engine on the test stand today when the prop hub sheared and flipped the prop over my house into the front yard. Glad I was standing behind the engine like I was supposed to.
These hubs must not be machined out of 6061, none the less it looks like a dangerous design with the hub wall being so thin.
I am going to have a custom hub made to replace this.

6061 from China ? I doubt it. []