Originally Posted by
SWORDSN
kwik and V2rider how much time do you have on your FG84 engines?
I have about 4 hrs on my first 84. Put about and hour and 20 minutes of run time on the second yesterday. The first one we ran 1 tank with extra rich settings and kept it below 4k rpm for the first tank and a half and then adjusted for a 6400rpm at WOT with a Mejzlik 24x10 2 blade.
Yesterday we ran the new one with the new break in figures in the manual. Put a little oil in the crank before turning over and ran the first tank with a Xoar 23x10 keeping it at about 3k rpm. Run for 15 minutes and cool for 20-30 minutes. Second tank went to the 24x10 and ran for 15 minutes. At this point #3 was running about 20 degrees cooler than 1 and 2 and throwing more smoke. Pulled and swapped the plug and ran for the rest of the tank. At 3000 rpm a 420cc tank lasted 30 minutes before the first air bubble in the line on the first tank, and 33 minutes on the second. After two tanks (1 hr) run time we let it cool and adjusted valves back to spec, swapped all three plugs and set low needle to 4 turns and high to 3.5 turns. Fired it back up and run it at some higher rpm for 10 minutes and let it cool again. Last run was another 10 minute run. It is now turning the 24x10 at 6500 WOT and idles nice and smooth at about 1400-1500 rpm with a quick smooth transition from low to high and back. Cylinder temps are all within about 10 degrees from high to low.
For fuel I'm running 93 octane with the lowest ethynol I can find and Klotz BeNol racing oil from the local bike shop. 20:1 calls for 6.4 oz to the gal. so I use 7oz. So far so good on both engines.