I have another brand of exactly the same type with only one large metal gear pulley coupling near the head instead of two or three plastic pulleys with bearings that the others have, which break down and melt with heat. In this one, neither the coupling pulley nor the drive belt breaks because the head is braked and stops if you let go of the coupling bar, so the drive belt does not move at idle and does not wear out. It has a brake on the flywheel; the head is permanently coupled with the belt, and if you notice in the photo, there is neither a coupling lever nor a gas lever. When you start the machine, you have to keep the lever-bar down with one hand, release the handbrake, and by pulling the starter rope, the head moves with it. At first, when it is new, it starts very easily; later it becomes heavier and is hard to start. When the starter broke, I made a groove on the wheel of the starter housing on the flywheel, and when the starter breaks, I remove it and pull it forward with a rope. The throttle is automatic; this Nakauama machine is better than mine because it has an opening in the head that you can open to clean the head from grass, check the belt, and change the metal pulley of the coupling if it ever wears out without having to disassemble and remove the entire head. Be careful, all these four-strokes need flat surfaces; they cannot work on steep terrain, either they burn oil and produce smoke, or they won't start again because the carburetor and oil filter have been pulled, or the engine burns out due to lack of lubrication. It cannot lift oil from the crankcase due to the incline. It is very light compared to the others, which helps to load it easily into the trunk of a Yota X, and of course, we must not forget that it saves a lot on fuel; it does not produce dirty exhaust fumes with oil mixture smoke, it burns pure gasoline and takes the medium-sized trimmer head, but do not put it on; it is heavy and will destroy the head bearings in half an hour. It is cheaper than a good backpack brush cutter, and it does not wear out the bellows and does not require constant graphite grease in the head like the others do

It starts very difficult and before finishing half of the tank it shuts off and needs over half an hour to start again.
The plastic on the bearing of the belt tensioner is worn out and IT IS NOT SELF-PROPELLED.

At first, it started easily, but after a while, it would shut off, and it would take a long time to cool down before I could start it again. After having it checked by a mechanic, they opened the carburetor. Now it works for about an hour, but then... it needs to cool down for a long time. I don't think it was a good purchase.

Having a grass trimmer (pb7300) from the same company, I can make a comparison. First of all, the machine is fine for its price. I bought it for a 10-acre farm with Actinidia. It starts easily as long as the soil is dry and there are not many bumps. It burns much less fuel than the two-stroke and also makes much less noise. It doesn't get stuck anywhere and cuts at a satisfactory height. If I could mention one disadvantage, it would be that you have to push it, but for its price, it is expected. For those who have a flat farm and need frequent grass cutting, it is great. Time will show its durability.

Just received it and assembled it... added oil, gasoline, pressed the pump three times and it started on the first try...
It is not self-propelled... it needs to be pushed!
The throttle cannot be adjusted, it has specific RPM... I think it's 3000... this might be good... we'll see.
This is the first impression... I will return for comments after a few days!

Unfortunately, I came across something defective. It didn't turn off during the first hour of operation! It had to burn all the gasoline. Then it worked without any problems twice, until the third time it turned off and refuses to move forward. Let's see what the dealership says.
The most recent...
The store where I bought it replaced a switch for me and it works... but it turns off every half an hour and needs to cool down to move forward. It's a hassle.
I don't think it's a good purchase.

It worked for half an hour and a internal switch broke. I have been waiting for the switch to be shipped from China (!!) to the dealership, and then to the service center for four weeks. You hear-read: Nakayama, and your mind goes to Japan.. oh no.. WASTED 300 EUROS. THE SWITCH FINALLY ARRIVED.. IN WINTER..

I tried it for 4-5 mowing sessions. Well, the trimmer line lasted me many days when I tried it, but now it only lasts a few days for 4-5 mowing sessions

I clean large areas effortlessly with this powerful machine. It appears to be very sturdy even though I use it for professional purposes.