ORIGINAL: Antique

A needle braring on the big end of the rod is necessary because most fliers don't want to use enough oil in the fuel...Large converted 2 strokes can get by on 10%, smaller ones need the same amount as a small glow engine...Then there will be complaints about oil on the fuselage, just like glow engine...Can't have it both ways.....
If the needle bearing was not necessary Tom at BME would not go to the trouble of pushing the crank pin out and replacing it with a harder one....

ORIGINAL: Antique

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So how come the video doesn/t show the pressure fitting for the pump in the rear cover ?
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ORIGINAL: mpascual
Like Saito small gas engines ? The FG36 (36cc) does not have needle bearings on the con-rod.
Like oldies spark plug small engines ?

On a 4 Stroke engine the amount of fuel (with oil) is smaller than a 2S engine and oil-fuel flow mix does not goes directly to crankcase (and con-rod) as 2S does.
Lubricity of gas(petrol) is much more than methanol.
I've count the needles on a small needle bearing availables today (caged), and the contact surface with the crankshaft pin is so small and can cause more troubles than a plain bushing.
Only my experience.

Best regards

ORIGINAL: aussiesteve


Whilst I do applaud Michaels attempts to creat something attractive to part of the market by making it a little diufferent to the myriad of other offerings fom his countrymen, He has not done to well so far in making his offerings anywhere near to decent for regular flight over an extended number of flying days.

A couple of things about your post

Comparing anything of Michaels creation to a Saito is quite an insult to Saito
Who has compared engines ? I've oly said Saito engines does not mount needle bearings, only plain bushing on the crankshaft side , and nothing on wrist pin side on some gas engines

The ''Oldy'' engines to which you refer also ran high oil QTY in their fuel.
And people using this kind of engines keep manufaturers instructions about recommended fuel/oil ratio. Do the same on NGH engines.

I never realised the NGH 9cc was a 4 stroke - why even compare it to one? On a 4 stroke, the heat input is also for half the revolutions of a 2 stroke.
Are you sure? I know the difference between a 4s and a 2S. Only was a reference to compare with engines with less lubrication and higher running temp than a 2Stroke

Michaels creations to date have a long history of early crankpin / bushing failures - that is called the proof in the pudding.
Maybe you're saying Saito gas engines does not have crankpin/bushing failures? We can talk about crank pin bushing/needle bearings failures on MANY engines brands. What's the first ?

ORIGINAL: captinjohn

Please do not load this video on photobucket. It works better and belongs on YouTube. Thanks Capt,n

ORIGINAL: Lifer

Am I seeing evidence of a very rough casting, or wear from running?

ORIGINAL: fiery

My engine (or should I say engine accessories) had the following faults ''out of the box''

1. One of the screws on the pump was cross threaded. Resolved by myself.

2. Carb low speed needle was not centred on fuel nozzle. Resolved by myself.

3. Carb fuel nozzle inlet not centred on high speed neeedle. It was drilled ''off centre''. Result being, the engine could not be leaned out as the high speed needle tip could not enter the orifice.

As a result the supplied carb was for all intents useless. There is no purpose to the membrane at the front of the carb. It simply acts as a seal.

I have returned the carb to HiModel with a note explaining the defects and requesting a replacement. We will see.

In the meantime to avoid owning a paperweight I am adapting a standard 46 size twin needle glow carb to work with the pump and engine. Initial running results are promising although the low speed needle on the replacement carb requires a finer taper to ensure clean transition from idle to full speed.