I just want to add something here which I think is important to note:
Almost any and all high port configuration engines will be tougher to tune. Period.
However, OFNA did a poop job on their documentation, as usual from OFNA ( I dont know why they can't just get their documentation together, for such a big company they truly SUCK ASS in that department ). That doesn't help matters any when you are trying to tune a mill, especially brand new.
I have learned however, over time, that when tuning a BRAND NEW MILL, that what works best for me is this:
Tune the idle screw by EYE - only a 3-4 mm gap when the barrel is closed.
Then, I tune the low end needle right off the bat, just enough to get it running. I closely monitor the temps as not to reach over 200-210 at idle. I let a tank or two run through like this and perform heat cycles ( where when either the mill stalls, or when the tank runs out, you adjust the flywheel so that the piston is up high for cool down. ) I do this for a couple of tanks.
Then, off to the high speed needle. A quarter turn at a time for the most part, just to get it running good enough to do figure 8's. The figure 8's prevent me from going wide open but still allow me to get the mill hot enough. Again, I do this for a couple of tanks, and when it dies or when fuel runs out, I position the piston up high and let it cool down.
While instructions are good for some companies, they still dont always match up to where your carb will get you both the temp and performance you are looking for. Even with the exact same mill, the needle settings can be way different.
So yes, this can also be dangerous. So while starting, especially in the beginning, keep it on a block of wood with the wheels OFF the ground. You can EASILY shut it down by completely covering the air filter or carb opening with your hand. That is if you have gone wayy too lean on the low end to get it started.
For me, this works well, but can be nutty.
Ill reitterate though on the high port (like a 7 or 8 port), they will be more cumbersome to tune. But when its done, you will LOVE the power and results.
Glad you are back and in hand.
