Wolf Predator 1.8
I have a Wolf Predator 1.8 like yours. After about an hours running with Lawboy 32:1 oil and 87 octane, it did 8100 with the old black 4 stroke 18-8 prop. I was well pleased for the engine is based on a Homelite 30cc jug W/ Zenoah G23 glow carb.
My Homelite 30 with the Zenoah G23 gas WA167A carb only does 7500 rpm.
Jim