Wear of a cylinder or piston in a 4t piston system of a device such as a Suzuki Sepia moped leads to the need to replace this unit. Also, replacement can occur due to deformation of the cylinder, which occurs due to debris and fragments of 4t piston rings getting into it. The main signs of wear are slow starting and sluggish acceleration, with a pronounced reduction in engine power, as a result of which the moped becomes unsuitable for riding. The cost of repair will depend on the complexity of the breakdown.
Faulty moped piston cylinder
Photo report: Reasons for the wedge of the oil pump and timing belt of the Alpha moped
After starting the newly “repaired” Alpha, the engine somehow didn’t work quite right... Although, how should it work if it was assembled from what we managed to buy cheaply from young GOPniks from the surrounding collective farms.
In theory, the engine should not have worked, but it did - that’s a fact. So, some kind of incomprehensible knocking/grinding noise was clearly heard in the engine, and after a few minutes of work, a stench wafted through the yard, which is characteristic only of a very overheated engine.
The moped rattled for a short time and died, and specifically...
I take off the valve covers - everything is “dry” and “blue” there. This is to the question that after any more or less serious repair, it is necessary to remove the valve covers and check the flow of engine oil to the timing parts of the cylinder head.
Since the moped was mine, I didn’t throw away all this blue junk; I only replaced the camshaft support bearings, sanded off the scuffs with sandpaper, put everything back together and the moped is still running.
Who knows what these police officers were doing with the moped, but in fact, the oil pump, which drives engine oil to the timing parts\KShN\CPG, is jammed. The oil pump drive sprocket is located on the left side of the engine - behind the generator.
The pump jammed, the drive sprocket became a stake, the teeth were eaten by the timing chain. That's where the grinding came from.
The pump was immediately dismantled and disassembled, but nothing criminal was found in it: the working surfaces were clean, smooth, without scoring, and the pump rotated very easily at idle. Greed ruined me and I decided to leave this damn pump. I collected everything to the heap, replaced the sprocket, started the engine and got the same thing: the pump jammed again and the teeth were cut off again...
It’s not in my rules to give up: the pump is intact and rotating - the train of thought at that moment is as follows: somewhere the oil channel is clogged, so the pump cannot pump oil through the system and jams.
The engine was completely disassembled, the channels were clean, just in case, I dug them out with wire and blew them out with a compressor, but the pump caught the wedge again and the teeth were eaten again. A trip to the nearest store clarified the situation with the pump - this device costs only 150 rubles. Immediately I say goodbye to the three treasured bills, unscrew the old one, put in the new one - start the engine - voila! The engine started, the noise disappeared, oil went to the head of the aki from Niagara Falls.
This is the story guys. If you encounter this, change the pump immediately. By the way, the moped has been running for more than a year, and the gangsters who killed him are stomping on foot
