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False Neutral #47: Geeking Out on Two-Strokes

Despite the lede image, we only say a couple of words about the Alpha BMW
…but it was too cool a shot not to include!

Mark Atkinson is back as our guest this week, at his suggestion. We delve into the dying star that is the two-stroke motorcycle world, discussing everything from porting specs to our favorite two-stroke manufacturers. If you enjoy hardcore tuning and engine-building talk, you’ll be in heaven while Garrett and Mark compare notes on building big-power RZ-based twins. This episode a 100% raw, unedited track, so you get what you get this week, as it happened. Fortunately, Mark is a fantastic guest who keeps things interesting.

False Neutral – Geeking Out on Two-Strokes


Mark’s RD/RZ Land Speed Record bike

Mark’s RZ-based motor

Mark’s Dyno chart

Garrett’s 650cc RZ

650cc capacity requires extensive machine work

RZ 650 cylinders

Garrett’s 350 Rebel

Buddfab 50cc LSR streamliner

A Honda NSR oval piston and rods

Rotary valve Kawasaki single

An aftermarket 2-stroke V4


2017 Yamaha YZ250

Garrett’s Lectron carbs

Rotax Type 486 500cc single

Hijera T486 Rotax

Ryger 2-stroke