Hi CF,
I hope this isn’t too far off topic, but I imagine you have more successful miles on a GX200 clone/22mm Mikuni carb than anyone else...!
So I ask you first for advice on my own like powered build, weather permitting I hope to fire it up tomorrow.
-What type of oil do you recommend?
-How much oil do you use, my engine is mounted at pretty the same upright angle as you.
-What notch do you have your carb slide at? (My engine is just straight up stock if you think that might make a difference)
-What do you recommend for a break in procedure?
Thanks in advance!
-Kirk
I estimate I have around 4000/4500 miles on mine now. Still run like a top. Can't be more pleased with it.
I always recommend synthetic. It just makes more power in any engine and makes it last much longer than standard oil. I'm using 3ow and it seems fine.
i use 3/4 of a quart. Any more and it spurts it out. I would make a dip stick showing where 1/4, 1/2, and 3/4 of a quart is just to keep you in the know. I made one out of flat brass stock and keep it hanging in the garage.
I'm running my engine tilted 3 degrees to the rear when the tires are flat on the ground. This is important because it causes the splasher to scoop oil for the all important big end bearing(provided you upgraded the connecting rod to the performance unit.
Adjust your valves to .003 for intake and .004 for exhaust. Can't trust the factory on this.
My carb needle is at the highest notch for the lowest needle setting meaning the needle goes into the float bowl the farthest.
I live at 45 feet above sea level and drilled out the main jet to about .049-.050 .The bike ran poorly before i did this. If you are sputtering are sluggish at acceleration this is the cause. So if it runs bad drill as small as you can and work up doing plug checks after a 5 minute test ride. You are looking for the all important rich cream color on the plug. If you are flooding your float bowl fuel level is too high, and it is starving for gas at speed it is too low. It took me a few times to get it right but once it is set it is going to be great.
Change the spark plug wire and cap when you can, they are not great. A quality plug is in order too. it's the same plug for an air cooled Volkswagen bug but one heat range cooler.
Put a rare earth magnet on the end of the drain plug to catch steel sediment. Radio Shack and Harbor Freight sell these. Change the oil early for the first couple of changes, every 4 hours of run time of so then you can increase it after that.
Let Us know how it goes!