AndyB Posted December 5, 2020 Share Posted December 5, 2020 Mine had done 35 hours before I had to remove the head and replace the piston with the warranty one (different rings). I assume the problem with the head bolts is that loosen over time? Or are they stretching? Has anyone tried marking them and checking? Quote Link to comment Share on other sites More sharing options...
Jim Sutton Posted December 8, 2020 Share Posted December 8, 2020 AndyB: How do you mark them? Where do you mark them? The lower head bolts definitely loosen (needed to be retorqued) after every couple flights. The replacement piston ordered from AC came as the old style piston, they did not send the new black teflon coated piston. Quote Link to comment Share on other sites More sharing options...
AndyB Posted December 8, 2020 Share Posted December 8, 2020 You normally just paint (I use tipex!) a line on the nut/head, then it is obvious if it has moved. Mine have not moved at all. AC have not changed the pistons to the "new black teflon" ones. They tried them for a while and there was no real additional benefit compared to normal. Quote Link to comment Share on other sites More sharing options...
Jim Sutton Posted February 7, 2021 Share Posted February 7, 2021 @AndyB I am not easily able to mark them as they are recessed. It's the lower bolts on the Tornado, nearest the exhaust flange, that periodically loosen. Santa brought a NM Torque wrench for Christmas. It's checked every flight now. ------ Very interested in your tuning experience as my Tornado remains at 6gph fuel use after engine rebuild with "new" XC head. I have not experienced a better fuel efficiency as claimed by AC. I am now out of break-in period [rich] so I need to properly fine tune the motor for best performance. At the next CARB rebuild time, I plan to try the WALBRO 37c 'mid-range fix' developed by Had Robinson of Southwestairsports: https://www.southwestairsports.com/ppgtechinfo/top80/hrservicenotes/walbrowg8/midrange_performance/midrange_performance_problems.htm Quote Link to comment Share on other sites More sharing options...
Solo21 Posted May 20, 2021 Share Posted May 20, 2021 On 16/11/2019 at 20:20, Dragonfly1983 said: Hello, I just read your post. I live in Poland near Dudek factory but I'm not Polish-man. I fly with Nitro (Polish factory Techno Fly call it Octagon). If you are still interested to buy engine from the factory, I can share my experience. Best Hello, im interested if you could share some experiance on how to buy from the factory. Tried to purchase from another polish paramotor manufakturer with the octagon 190 but they could not sell to me? Best Regards/ Jonas molle70@gmail.com Quote Link to comment Share on other sites More sharing options...
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