CISON L4-175 17.5cc Mini OHV Inline 4 Cylinder 4 Stroke Water-cooled L4 RC Gasoline Engine Model - Speed Up to 8,000rpm
$999.99

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This is the last batch of CISON L4 in stock!

SKU 33ED3436709
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Customer Reviews

Based on 5 reviews
80%
(4)
20%
(1)
0%
(0)
0%
(0)
0%
(0)
D
Daniele (Lugano, CH)
Stupendous

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..

L
L.t. (Istres, FR)
Joli moteur

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.

T
The real Michael M. (Rossendale, GB)
A superb little engine.

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.

正樹 梅澤 (Hamamatsu, JP)
CISON L4 175 OHV

send a video

G
Gary (Northampton, GB)
Cison L4-175 issues

I would love to give 5 stars for this engine as overall it is a lovely engine. Unfortunately I have had several issues with it.
First of all the conrods came with 3 different lengths of bolts fitted this was due to the rods not being tapped deep enough (there was a bag of bolts tucked underneath the rods in the packaging which were the correct length). But I still had to purchase a tap to rectify the problem.
Secondly when I fitted the piston rings to the first piston the rings would not rotate and were stuck in the piston. On further investigation I found that there was a sharp edge on the inner edge of the piston ring, this sharp edge was on 5 out of 8 of the rings. Unfortunately when trying to remove the rings from the piston one of them broke as it was really jammed in the ring grove, the other rings I used a fine “Norton” stone to debur them. I have been trying to contact EngineDIY since December and I am still waiting for an answer from Lucas.
Thirdly the oil pump body also had two out of the four threads which hold on the rear cover not tapped deep enough. Again I had to purchase a tap to rectify the problem.
At this point I have shelved the engine and not gone any further as I am waiting for a reply from EngineDIY. Fortunately I am an engineer so sorting out these problems is not a big issue for me but if you are someone with little or no experience in engineering / mechanical problems then I would say this is not for you as the build manual leaves a lot to be desired.

Customer Reviews

Based on 5 reviews
80%
(4)
20%
(1)
0%
(0)
0%
(0)
0%
(0)
D
Daniele (Lugano, CH)
Stupendous

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..

L
L.t. (Istres, FR)
Joli moteur

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.

T
The real Michael M. (Rossendale, GB)
A superb little engine.

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.

正樹 梅澤 (Hamamatsu, JP)
CISON L4 175 OHV

send a video

G
Gary (Northampton, GB)
Cison L4-175 issues

I would love to give 5 stars for this engine as overall it is a lovely engine. Unfortunately I have had several issues with it.
First of all the conrods came with 3 different lengths of bolts fitted this was due to the rods not being tapped deep enough (there was a bag of bolts tucked underneath the rods in the packaging which were the correct length). But I still had to purchase a tap to rectify the problem.
Secondly when I fitted the piston rings to the first piston the rings would not rotate and were stuck in the piston. On further investigation I found that there was a sharp edge on the inner edge of the piston ring, this sharp edge was on 5 out of 8 of the rings. Unfortunately when trying to remove the rings from the piston one of them broke as it was really jammed in the ring grove, the other rings I used a fine “Norton” stone to debur them. I have been trying to contact EngineDIY since December and I am still waiting for an answer from Lucas.
Thirdly the oil pump body also had two out of the four threads which hold on the rear cover not tapped deep enough. Again I had to purchase a tap to rectify the problem.
At this point I have shelved the engine and not gone any further as I am waiting for a reply from EngineDIY. Fortunately I am an engineer so sorting out these problems is not a big issue for me but if you are someone with little or no experience in engineering / mechanical problems then I would say this is not for you as the build manual leaves a lot to be desired.