CISON L4-175 17.5cc Mini OHV 4-Stroke Water-Cooled Gasoline Engine - High Performance Up to 8,000rpm

I ordered a Cison L4-175 and received an L4-205 Big Bore for the same price, which has 3 cc more displacement and is probably the 2.0 variant of the L4 engine.

The joy of the engine begins with unpacking. It is not in a cardboard box or a plastic box but in a beautiful bamboo wood box with the engine logo and model lettering burned into it. The individual engine components are placed in molded foam, the small parts and screws are sorted in well-labeled and illustrated small parts boxes. The building instructions, which are written in English and have extensive illustrations, must be downloaded from the website.

I am fascinated by the metal aesthetics, the wonderful weight and solid quality of the individual engine components. We live in a time where almost everything is geared towards cheap production and manufacturing. Cison makes an exception here that justifies the price of the kit. Every component, be it crankshaft, connecting rod, camshaft, cylinder head, gears, etc., is made from solid material with outstanding precision. I checked some fits. Thanks to only minimal tolerances, the parts fit into each other almost by themselves. The engine block and its surface quality is the highlight for me. You can put it on the shelf as it is. For me, each component is beautiful, like a little piece of metal jewelry. Anyone who has a passion for mechanics, who wears hand-wound watches and can recognize and appreciate quality should treat themselves to a Cison motor.

I won't build the engine because you won't be able to see most of the beautiful parts of the finished engine. Unbuilt, the kit has the appeal of an open but untouched box of first-class chocolates with everything still inside.

My only complaint is that some parts are tarnished and the connecting rods are partially discolored. Probably some kind of light corrosion that can't always be polished off. This is unimportant for people who build the engine, because you won't see these parts afterwards anyway. For me as an esthete, the only negative point about this wonderful kit, which costs Cison the fifth star, which I would otherwise have liked to give.

This engine is the improved evolution of the 4-175 flathead model.
Apart from some initial problems with the electric starter motor, the engine starts well and runs really smoothly with a nice voice. The intake and exhaust manifolds are truly exceptional. Some reservations for the precision of the carburettor. It would be nice to be able to have a 4 carburettor supply (of good quality) to make the engine even more sporty and performing..

Je trouve l'ensemble plutôt bien fini .
Je ne peux pas en dire plus pour le moment car un problème sur 2 bielle qui on probablement un problème d'alesage quand je les serres le.moteur ne tourne plus .
Donc j'attends les bielles
Par contre le manuel de montage est un peu léger en explications et manque cruellement d'informations plus précise pour l'assemblage
Et de plus disponible qu'en anglais.

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Another superb little engine from Cison, it looks really cool & sounds great, well engineered & designed the only thing I struggled with was fitting the main mixture control screw to the carburettor, the rubber o ring seal wouldn't fit into the tube, the recess on the screw where the o ring fits was too shallow & should have been machined a bit deeper, I have come across this same fault on other Cison engines. I machined the recess myself & now the screw & seal goes in comfortably, apart from that all is well, I love it.