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Hi all, I jist did my 25h maintenance and all hell broke loose! I never had a problem with my power band, my cruise flying level used to be at 5800rpm to 6400rpm (depend on trims setting). However, now when I power up to 5600rpm, all is smooth, then as i add throttle to cruise at level there are no change in the rpm, and as i add throttle squeezing 2 to 3 mm then suddenly the power jumps and rpm instantly goes to 6700rpm where I am climbing! All this after working on the carb adjusting the hi/lo and my motor runs at slightly rich setting. Note: Today i cleaned the throttle cable and handle, and then changed the carb putting one from my friend's, the problem persist! Still power jumps at 5600rpm! Any ideas what else to do?? Could it be related to dust or exhaust?!

I bought a used ParaJet Volution 2 Macro last year (it's a 2012 model). An injury kept me from flying much but it seems like it has never run well. I’m not able to get over 6500 RPM with it and even that seems to be inconsistent. That manual says to shoot for 7600 RPMs. I can run it up, get 6500, let it back to idle, then get 5500 when I run it up again. Here’s what I’ve tried so far. Replaced the fuel tank cap and fuel filter. Replaced the fuel line and put in fresh fuel. Rebuilt the carb with the OEM kit (Walbro 37c). Adjusted the throttle cable to ensure there was no slack or kinks. Replaced the spark plug twice. Had a friend check the compression. I don’t recall what it was but it remained the same each time which led him to believe there were no air leaks. Adjusted the high and low jets as well as throttle after each change. Checked the packing on the exhaust silencer. It's relatively clean and nothing is loose. Checked the resistance of the CDI and spark plug wire I’m at the point where I may have to replace the carb and/or replace the reed valve. I also read that loose packing in the exhaust system could cause problems. I’m getting very frustrated and don’t want to just start replacing things. We fired up my buddy’s Volution 2 and it ran right up to 8000 RPM. Since the high-end RPMs have been inconsistent (even when manually holding down the throttle lever), it's been hard to diagnose. Has anyone seen a similar problem and, if so, how was it fixed? Thanks!