Courtesy or R/C Scale Aircraft magazine (Vol 14 Issue 7) : UK

Ian Bell checks out this latest 23cc 2-stroke from Hungary. If you are lucky enough to own a Moki 1.80 then you will already be aware at a glance of the quality and workmanship that hits you in the face when you open the box. The exception with this NEW engine is in that there is a little extra. You will immediately notice that the outer edges of the cylinder cooling fins have been machined and polished to a very high standard indeed.

Being easily identifiable as a Moki by the round slow running needle, instead of the normal 'screw' type often seen on other engines and all original 'Moki' engines have the same type of carb.

The main components

The crankshaft is 102mm long running on two ball-bearing races. The machining on the crank is superb and the prop driver is held on by a tapered collar. The Moki 135 has a stroke of 30mm, just under 1 1/4" in real money with the transfer tunnel measuring 14mm down the centre of the crank. The cylinder head is made from aluminium and machined with a quality of excellence. The piston is also ali and ringed and the conrod is ali with a phosphure bronze Big End and Small End bearings, and the gugeon pin is held in with tiny circlips. The crankcase is an excellent piece of engineering and looks like a beautiful piece of sand-cast aluminium. The transfer ports are quite big for a 1.35 size engine, but again Moki seem to have got it right. The balance of power and reliability is just right.

Running In

It is suggested that 30 minutes running-in time is ample to let the parts bed-in properly. The running-in procedure should be for just 2-3 minutes at a time, being sure to let the engine cool down between runs. A 'ringed' engine should always be run-in ' slightly rich which gives the engine a good lubrication and helps in cooling the engine.

Starting and running;

Again I decided to run the engine on our special engine stand with props ranging from 16" x 8" - 18" x 10". The silencer used on the engine was a BCM Pitts exhaust, again supplied by the same importer as the engine. The fuel used for testing was a 20% Castor based 80% Methanol mix from Southern Modelcraft. With ease, the engine was primed and started after just a couple of flicks. Take care with large props and they can 'bite' if over primed.

The figures show the results of the static running test.

20% Castor/80% Methanol

Prop	Size	Safe Idle RPM	Max RPM
APC	16x8	1,900	9,500
APC	16x12	1,900	8,300
Airflow	17x10	1,800	8,300
Dynathrust	18x6	1,800	8,100
Premier	18x8	1,500	7,800
Smart	18x12	1,400	7,000
Smart	19x10	1,400	6,800
Menz	19x10	1,300	7,000

Silencer and Engine Mount

A Radial Mount is optional, and screws straight on to the back of the engine in place of the backplate. The wide selection of silencers is also optional from this importer. The quality of the whole engine appearance, including the material quality, is always first class and of course being supplied by the UK Moki importers, Just Engines will give a full back-up service. Supplied with the Moki 1.35 is a manual/instruction booklet that tells you everything you will need to know about your new engine. So there you are - a good engine that is inexpensive with the option of mounts and silencers for your installation.

More Reviews

You can find more Moki engine reviews here.

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