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The 28 Spec 1S is a .28 cubic inch big block engine featuring a machined billet aluminum heat-sink head for extra cooling, dual bushing aluminum connecting rod, and true ABC chrome sleeve construction for durability. A three needle 8.5mm slide carburetor with a composite body provides for better performance at higher temperatures. The carburetor features a factory re-set line on the high speed needle, and flush needles making re-setting, to baseline factory specifications, quick and easy. There is also an optional Turbo Button head available.
This is a direct bolt-in replacement engine for any .21+ engine mount, and will accept most aftermarket shaft drive starting systems.
Specifications
Size: .28cubic inch/4.6cc
Maximum RPM: 36,000
Bore: 18.6mm
Stroke: 16.9mm
Construction: ABC
Heat-sink Head: Green Anodized Aluminum
Carburetor: 8.5mm Composite Slide Carb
Carburetor: Adjustments 3 Needle, Flush Settings
Case: Black Aluminum, Rear Exhaust
Connecting Rod: Dual Bushing
Sleeve: 8 port
Starting system: Pullstarter
Recommended Glow Plug: Cold-5 Power Plug/ O'Donnell #99 (Any other brand standard length non turbo cold glow plug will work also)
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