India's most loved two-stroke
The Yamaha RD350: Kept Alive
A 347cc air-cooled twin that embarrassed bigger bikes in the 1970s — and still does. This site is a working reference for anyone who owns, restores, or simply can't stop thinking about the RD350.
Read the history Open exhaust designer
What's on this site
Most RD350 information online is scattered across forum threads from 2007 with half the images broken. This site pulls it together — history, specs, port maps, tuning, and tools you can use in the garage.
Ignition Timing Guide
Points and timing for HT and LT.
More Power Without Splitting the Cases
Tuning guide for more horsepower.
RD350 Maintenance Guide
Keep the two-stroke alive.
Yamaha RD350 Specifications
RD350B spec sheet and port maps.
Yamaha RD350 History
From the YA1 to the RD — the complete lineage.
Latest articles
Squish Band Tuning
Squish clearance explained.
Expansion Chamber Selection
Pipes that actually work.
Carburetor Jetting
Jetting the Mikuni carbs.
Ignition Timing Guide
Points and timing for HT and LT.
More Power Without Splitting the Cases
Tuning guide for more horsepower.
RD350 Maintenance Guide
Keep the two-stroke alive.
Tool
Expansion chamber designer
Calculate expansion chamber dimensions for any two-stroke. No spreadsheet — enter port timings and get cone dimensions out.
Open calculatorAlso: cone generator, carburetor jetting, squish band, and ignition timing.
Featured products
Garage notes
Occasional RD350 notes. No spam.