Hi Guy's, I am working on doing a gas/glow conversion on a Stihl, 65cc, 4-stroke. The problem is the spark plug hole is for a 10mm plug. I need to enlarge this to standard plug size so my glow plug adapter will fit. I am actually looking for someone who can do this since I do not have the tools or skill to re-drill and re-tap the hole. I tried contacting Mark Brielli but no response so far. Suggestions please. Thanks for your consideration.

Probably cheaper to get another adapter that does what you need.

Okay, where do you suggest I find a 10mm adapter?

Call these people

http://www.ch-ignitions.com/ord.html

Yep we gottum.

John,
DO NOT enlarge the hole! The plug hole is VERY close to the valve seats/valves and running a drill/ tap through there will almost certainly hit them. As you may have noticed the head and cylinder is one unit and it is darn expensive to replace.

John

Excellent TKG, Just to re-confirm you have a 10mm glow plug adapter that will fit the Stihl, 65cc, 4-stroke? You'll have my order soon. Thanks.

Our 10mm to 1/4x32 adapter has the same threaded length as the CM-6. If your head depth matches your OK, if not you may need to machine the head

The stock plug for the Stihl 65 is an NGK CMR6H, which has a longer threaded length than the CM6. If there is an adapter for a Zenoah G-26, that MIGHT be the way to go.

J

Okay, thanks guy's, J glad you added that about the valves being too close. Really didn't want to machine the head.

The CMR6H is a very long reach and our adapter won't work. So you're going to have to spot face cylinder.

I'm real interested in how this works out for you. Please keep this going as I have a 32cc that would consider converting if you have good luck on gas glow.

Jim

Please explain,"spot face" the cylinder. Do you offer this service?

You take a big end mill and you start milling (cutting) untill the thread depth is correct. Zenoah does this on the cylinder for the G-26 EI. The G-26 magneto uses the CMR7H, so they face it down and install the CM-6 in the EI version.
WE DO NOT OFFER THIS SERVICE. Unless you know sombody who works at a machine shop and can do this on the side after you take the engine apart. You might be better converting it to EI and run just gas.