**Built-To-Order. Please email and confirm delivery ETA before ordering**
The Most Powerful engine kit on the market, the Menace85 SS bolt-on kit! 8.3HP!!
Upgrades:
52mm Bore x 40mm Stroke
CNC Smolik Head
Balanced Crank
"MZ65 Style" Expansion Chamber Pipe
PHBG 21mm Carburetor
CNC Piston Port Intake
Standard Parts:
36t Sprocket and Har...
Reviews
4.9
39 ratings
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Quality product. Performes great. Definitely recommend this product and company.
Larry · 10 days ago
Good motor just been waiting on my exhaust gasket and bolts I repurchase but motor great
T
Tanner · June 1, 2026
Fun project, great service. The Smolik's are super active in the motorized bike community, and respond to questions. I had my ported motor kit in about a week, and the only reason it isn't running yet, is I need some parts to make it work with my bike, absolutely not their fault. I checked the engine over, and it was clean of shavings, squish gap was excellent. I will caution, because it caused me some confusion, they started shipping with one base gasket installed, rather than 2, and I don't think they changed the site to reflect that, but I turned to the Internet to research, and sure enough, the question was asked, and Kurt confirmed that the gen 3 only needs one base gasket. Thank you guys for what you do, and I look forward to a long working relationship with you.