Any information on Zenoah G50?

[Built2Fly]

@sigrana, that matches almost exactly what I have. I have a set of 3-blade IVOPROP with my project. Each blade is about 28-3/4" from tip to mounting hole. The radius of the mounting hole circle is about 2-1/2". So the prop has a full diameter of 60".




The engine drives it through a belt reduction unit. I don't have the reduction ratio measured yet, but I would guess that it is the original reduction unit with G50. Yes, this will be installed on an ultralight Hiperlight SNS8 which I am building. I once watched a video on EAA archive. It says that the load is an important factor in tuning the 2-stroke engine. A lot of times what we think is a carburetor issue could indeed be a load issue. I think we are on the right track.

By the way, I tried to keep as much discussion here as we can. This is so there are some information left that can be shared by the people who might come at a later time with similar quests. However, I do want to respect your intellectual property. If you felt that there are information that should be left to a private discussion, we shall move to use email. Thanks a lot.

 

[sigrana]

Thank you. Everything seems to work to a tee. I would be happy if from now on you would use my email address: msmprod@optusnet.com.au
Please send me a test email telling me that it is you sending it.

 

[Built2Fly]

@sigrana, a test email has been sent.

A question unrelated to the exhaust: The G50 uses two carburetors, one for each cylinder. Do people run it with two fuel lines / pumps, one feeding each carburetor? Or is it commonly done with one fuel line and a Y splitter? Sorry for the stupid question.

 

[akwrencher]

Shouldn't be any reason to use two pumps, hundreds of thousands of two strokes out there feeding multiple carbs from one pump. Lines just teed together. Disclaimer, I know nothing of the G50 in particular.

 

[sigrana]

Shouldn't be any reason to use two pumps, hundreds of thousands of two strokes out there feeding multiple carbs from one pump. Lines just teed together. Disclaimer, I know nothing of the G50 in particular.

Both G50s I owned (they were new) had a single fuel pump with a Y splitter andn it worked really well.

 

[Built2Fly]

Thanks for the info. It's good to know that one pump can do it.

 

[n3puppy]

Also makes a difference what brand/style pump you are using.

Mikuni makes two general styles -
Rectangular Single outlet for single carb
Round dual outlet for dual carbs

Big difference in volume - 15ish vs 30ish liters per hour.
Rotax uses dual outlet round on twin cylinders like the 582

If you are planning on using a Mukuni pump - best to get a high volume dual outlet to be sure you have enough fuel flowing, especially during full throttle climb outs

 

[Built2Fly]

That's great information. I am glad that I asked here.

I have a few pumps. It looks like one on the left is the low volume Mikuni (probably not enough to drive both carbs). The one on the right hand side is a Keihin that seems to have two out ports. Does anyone know about this pump? Where can I find a rebuild kit for it? Thanks.

 

[sigrana]

The pumps I had on my Zenoa G50 engines were rated at 31 lt/hr.

 

[Mr Mom]

Hello, Are you still working on your Zenoah G50? I have two Osprey airboats built by Tennessee prop. So I have an extra shop manual.

 

[Mr Mom]

Were you able to locate a source for parts?

 

[TLAR]

Very nice thread, problem and solution, great communication, an excellent example of how powerful this board can be
All the best!

 

[Built2Fly]

@Mr Mom, that sounds wonderful. If possible, I'd like to buy the spare shop manual from you. Please let me know how we can work it out.

 

[Mr Mom]

I sent the manual usps. It should arrive soon.

 

[Built2Fly]

@Mr Mom, thanks a lot. I am looking forward to that.

 

[Built2Fly]

Thanks to @Mr Mom, here is the Owner's Manual of Zenoah G50. A load of useful information. There is also a shop manual which I will scan in a bit later. Enjoy!

 

[Built2Fly]

Here is the shop manual of Zenoah G50. A lot of details on how to work on the engine. It is a very large scan file, so it is split into six parts in order to fit in the 10MB upload limit of this site. Enjoy!