Pulled the r-key on fcsc.

I have posted threads about top end flutter with the fcsc.I installed the r-key on the crank.I could never get a good reading on the plug.With 72 jet clip in 4th plug was a realy light grey to white.I would think I would be rich.Bike had poor mid and top flutter really bad.Today I pulled r-key and set the clip in 3rd.Mid was way better and top end flutter was better.I was happy with the results for today.Got home and pulled plug.Low and behold plug was black.Even though the bike was running much much better.I was planning on leaving the jetting alone at this point due to it was running really good with a little top end flutter.Now that I can get a good reading on the plug gotta pull my jet pack out once again.I dont think all our cag engines really like the r-key.I'll keep you guys posted on the next day of jetting with review.Trying to help us out tunning the fcsc.

Try lean on the jet and fat on the needle.
For testing purposes try the needle on 6 by adding a small washer under the clip and try a 68 or 70 jet.

I believe the rocket key is just a goped item that happened to transfer over to the pocket bike scene, not a purpose built part for cags

Try it backwards

Just remove it.The engine seems to run better with out.With the r-key plug was always white no matter of jetting.