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Platform Guides
Engine-specific service, jetting, and upgrade notes for the bikes you're most likely to wrench on.
Puch Maxi — E50 & ZA50
Clutch tuning, Bing jetting, reed vs piston-port kits, and staged 70cc upgrades.
Full Guide →
Tomos A35 & A55
Chain tension, gearbox oil, Revival differences — Slovenian chain drive, not a scooter CVT.
Full Guide →
Honda Express & Hobbit
Oil injection pump service, clutch bell wear, NC50 vs PA50II — no premix in the tank.
Full Guide →
Piaggio Ciao & Bravo
Pedal moped variants, parts sourcing, and how Ciao differs from Vespa scooters.
Full Guide →Performance paths
Build Database
Mild, mid, and wild upgrade paths per engine — parts lists, jetting targets, and realistic power goals.
Puch E50
From derestricted stock to reed race builds — clutch, pipe, and 70cc kit combos.
Tomos A35
Reed block, two-speed clutch, SHA jetting, and 70cc kits on chain drive.
Peugeot 103
Variator weights, SHA sealing, ignition refresh, and ported euro kits.
Motobécane AV7 / 50V
Variator service, Gurtner jetting, ParmaKit cylinders — Moby-specific notes.
Minarelli V1
General, Cimatti, and badge-engineered Italian frames — clutch, jetting, porting.
Go faster, stay alive
Tuning & Tools
Porting guides, jetting walkthroughs, and live calculators — Graham Bell math, moped-scale.
Exhaust Porting Guide
Duration, blowdown, shaping single-port cylinders, and fuel notes.
Read guide →
Carb Jetting — Bing & SHA
Stock jet baselines, plug chop method, per-platform starting points.
Read guide →Port Timing Calculator
Live dyno model, scaled port diagram, duration & blowdown — Puch presets.
Open tool →Expansion Chamber Designer
Graham Bell tuned length, cone angles, and true-scale pipe profile.
Open tool →Intake Length Tuning
Jennings ram formula, Helmholtz pre-carb, live tract diagram port to filter.
Open tool →Lookup & legality
Reference & Quick Tools
Laws, manuals, maintenance charts, and explainers — bookmark these before you buy or wrench.
US Moped Laws
Searchable 50-state table — license, registration, speed limits.
Oil Mix Calculator
Interactive premix ratios — gas or oil in, the other solved.
Free Manuals
Factory PDF links for Puch, Tomos, Honda, Peugeot, and more.
Moped vs Scooter
Pedals, drive type, and why a Vespa isn't listed here.
Buying Guide
2026 prices, inspection checklist, title red flags.
25 Classic Mopeds
Platform histories, specs, and US-market context.
Maintenance Hub
Carb clean, belts, plugs, oil mix, seasonal storage.
Live Chat
Ask builders — bring jetting, porting, and pipe numbers.
Seattle Moped Runner
Free browser game — dodge Seattle streets, combos, shop skins.