Carb adjustment- small Chinese 4cy motor/gen?

I bought an unused 2006 gasoline motor/generator. MOTOR ID; 6ZHRS.1961NL; ZHEJIANG ROBOT POWER MACHINERY CO., LTD.
EPA ENG # B168F060700148 SN 0607014264; 196CC; 6.5 HP

1. NO MANUAL. Anybody have a manual for this motor?

2. Runs rough under 1/2 load. Are there adjustments on the carb? I see a black p-head screw and a tiny brass screw but don't know what their functions are.

3. Calls for Cat SF oil, which is obselete. What oil should I use?


Thanks for any guidance. Dixieflash

 

I assume this is going to be another chinese clone of a honda engine. If so, the black screw is probably the idle adjustment. The brass one is probably the bowl drain. Use any sae30 or 10w-30 oil. New oil ratings supersede obsolete ratings.

As for a manual, good luck. There have been a lot of chinese knockoff companies to come and go. Some of their manuals were written so poorly that they may as well not have been written at all.

 

Yes, it's a typical Honda knockoff. I emailed the mfgr last week but so far no reply.

The brass screw is not the bowl drain one. It is on the side of the carb just ahead of where it bolts onto the intake manifold. I guess it's a 6-32 with no head - s'driver slot for 1/8" blade. Looks like it would be a high-speed adjustment by the location. ??

Oil - does it need DZZP additive or a little Rotella added to the mix for benefit of the flat tappets and cam lobes? I have been advised to do that.

Thx. Dixieflash

 

Ok, that screw sounds like it is the idle mixture screw. Set it two turns out from lightly seated.

I don't recommend adding anything to the oil.

 

Cheese, this motor is coupled to a 120 ac generator and when started runs at full speed. I might be able to manually control the governor to make it idle. Guess I'll try that.

The motor runs smoothly when not under load; when I plug in a 1500 watt space heater, which is 1/2 rated continuous load, the motor misses some. Ignition should be okay - seems like maladjusted fuel/air to me.

I have installed a natural gas kit and have not been able to get it started on NG, the one time I tried it. Temp here are in the mid 90s everyday and it's just too hot for me to pull on a rope start motor very long at a time. I will be 80 in Jan and it ain't like it used to be!

Thanks for your help. Dixieflash, sweatin' in Dixie

 

If this unit doesn't idle at no load, then I wouldn't be too worried about the idle mixture screw. You might get it to make a small difference in the way it runs at high speed by adjusting it.