ifunpixel

Air Creation swapped the plugs because they felt the rpm was more stable in flight! The prop is not variable pitch so cannot alter that. AC says some of their engines achieve full 7500 rpm, others less though they may 'loosen' with time. Even at 6800 ish it is in the right part of the power curve it is suggested. I don't feel that the engine is running rich but am aware of the possibility.. Cannot insert a thermostat without purchasing a different water outlet pipe connector on the cylider head because of the arrangement used by AC - easy enough to blank off anyway so I will live with it. AC suggest an idle rpm 2800ish with clutch engagement 3000-3500. Perhaps my MGL E1 instrument is not reading correctly but mine will idle below 2000 though it doesn't quickly or reliably return to below 2000 after throttling up. How can I set my max rpm as you imply you do? Could you tell me what two stroke oil you use and where you get it from please. Presumably fully synthetic! I am using the champion spark plug supplied - what gap would you use? Or do you considvthe NGK one to be better? Would be interested in your further info.

I have this engine on an Air Creation iFun pixel. This uses the iFun 13 wing on a solo trike. I was asked to return the initial carb after a few months and the replacement came with a main 130, slow 45 and needle 277 set at the second notch down from the top. I thought both carbs were the PWK 28, certainly the replacement one is since it says so on it. The fuel overflow pipes are slightly different however. The radiator is the Air Creation set up, below the engine. I have found no obvious difference between the two carbs, the earlier one having a Polini main jet 124. The egt (mgl) sensor is positioned close to the manifold and reads about 560 to 580 generally. Over the winter I have blanked off about 2/3rds of the radiator. The coolant temp is mostly about 70 degrees, and never as high as 90 though at times 80+ On the earlier carb I had lowered the needle to the top notch and the above readings have been similar in both old and new setup. I am considering lowering the needle in the new carb, also to the top notch, on the basis of relatively low egt readings and in the interests of economy which is disappointing at the moment at closer to 10 than 5 l/h This is where the egt sensor is useful. If I lean too much then I can spot any high readings that might risk engine overheating/seizure. I find that the max rpm is about 670 - once again this has been the same on both of the carbs aand is lower than I want. Could this be a result of the prop size? By and large the engine is smooth above about 4600 rpm and a little lumpy below this. Pick up is decent enough on accelerating but return to idle is not too good. I have set the idle rpm to about 1700 to avoid the engine stopping on tick over on finals. It did stop once when I had perhaps set the idle a little low. Hope this is of interest; any suggestions/comments welcome. Basically I am fairly happy with the engine but would like the max power/rpm to be greater, given the suggested figures of 7000 to 7500 (presumably improving the takeoff distance to that suggested by AC),the economy to be better (nearer to say 6l/h) and the idle to be more consistent. The engine has about 25 hours on it. Spark plug supplied was the Champion Copper Plus RN2C though I believe you can use the NGK BR 10ES also (read this somewhere).