davewallace

My Feedback: (29)

Hello everybody,
I haven't flown my 26cc Ryobi 4C yet. Too many engines, too little time. I would like to know if any Ryobi four cycle flyers have had any issues with radio interferrence. Reports of problem free use are great also. The engine uses a special 10mm threaded spark plug and I don't know if it is a resister plug or not. I don't think any other plug will fit this engine. Well, now it's your turn to help the rest of us out.


Thanks, Dave

av8tor1977

My Feedback: (6)

There's a special resistor, shielded, spark plug cap/connector that you can use if you encounter a problem.

AV8TOR

Sr-Telemaster

If you have a ohm meter you can check it by testing from the top to the center electrode. non resistor will show dead short, resistor plug will show resistance.

Antique

My Feedback: (4)

If there's an "r" in the number it's a resistor... Look at www.sparkplugs.com
Champion RZ7C
NGK CMR 6 and/or 7
There's a Denso plug also, the porcelain is longer...

davewallace

My Feedback: (29)

Hello,
I measured a brand new plug and got 7 meg ohms on the nano semans scale. Most meters won't go that high. I guess that should be enough resistance. A regular meter showed an open cirruit.

Dave