rob1980 Posted April 6, 2017 Share Posted April 6, 2017 Hi, I wonder if anyone can offer some advice please. I noticed when flying the other evening that when under full power in the climb, after about a minute the motor starts to drop in power. I then released the throttle slowly and tried to pick it up again. Only would reach where it had dropped off to before. Noticed if I then gave it about 10-15 seconds of idle and try again, I then have the full power again. Carb is a Bing 84. I did change the bearings in the prop hub end of last season. I'm just not sure if it was carb ice or the bearings starting to seize in the prop hub. Not sure, so I thought I would ask you guys Quote Link to comment Share on other sites More sharing options...
Neilzy Posted April 6, 2017 Share Posted April 6, 2017 Have you checked the tank vent are you getting tank vacuum Quote Link to comment Share on other sites More sharing options...
rob1980 Posted April 6, 2017 Author Share Posted April 6, 2017 Hi and thanks for the reply Neilzy, I'll check it today. I removed the white one completely so I would not forget to change them over to the red one. Good thinking. I'll let you know Quote Link to comment Share on other sites More sharing options...
rob1980 Posted April 6, 2017 Author Share Posted April 6, 2017 I checked the fuel cap and it's all fine Neilzy, it was a great idea. The hole is clear. Someone suggested that the plug could be the problem breaking down at high rpm. It's not been in very long (less than a couple of hours) from new. Little strange as it picks up again fine if I leave it at idle for a while before going back to full power. Should mention maybe I'm using AVGAS as suggested by fresh breeze rather than Mogas. Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted April 7, 2017 Share Posted April 7, 2017 (edited) My advice is 1 do not use avgas (contain led and sulfur) if you have nicasil cylider liner you can destroy surface 2 Check please your fuel filter this on fuel line (if you have) or this in the bottom part your carb,sounds exactly like dirty filter or restricted fuel flow Edited April 7, 2017 by Dariuszk24 Quote Link to comment Share on other sites More sharing options...
rob1980 Posted April 7, 2017 Author Share Posted April 7, 2017 Thanks Dariuszk24, I take those points on board, so thank you for the reply. But I am now sure I have found the fault..! I removed the float bowl and then tried blowing into the breather tubes on the carb. Found it was blocked as Neilzy had me thinking about things. After clearing the blockage, it tested fine on the ground, so I tried it in the air. Full power was fine and maintained good climb to 1500' where I gave it a breather and responded fine. I'm guessing that the fuel couldn't fill the float chamber quickly enough because of a positive pressure building inside. Having it at idle for a while allowed it to equalise before I demanded more. Well I'm guessing that is what happened. Thanks again guys. Hope those of you that got up this evening had a great flight as I did Quote Link to comment Share on other sites More sharing options...
Leroy Posted June 5, 2021 Share Posted June 5, 2021 Hey guys! have the fresh breeze Simonini and am having problems with power at full throttle. It turns up fine until about 2/3 throttle and then runs ruff and lugs down. Any ideas. I’ve totally cleaned the carb and checked for proper placement of needle valve. Also what are the proper settings for the fuel/air. Quote Link to comment Share on other sites More sharing options...
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