Understanding V-Twin Sump Chemistry: Why Your Oil Mix Matters When it comes to maintaining a Harley-Davidson, oil choice is a frequent topic of conversation. If your bike is configured to…
Geoff GaitesSeptember 24, 2026
Why Your Gen-2 M8 Shuts Off Instead of Just Running Rough If you've ridden older Harleys, you probably remember how they handled a fuel problem: the Check Engine Light came…
Geoff GaitesSeptember 1, 2026
The technical reasoning behind my choice of measurement hardware. My hardware choices aren't about brand loyalty — they're about data integrity. I use the TTS MasterTune system paired with…
Geoff GaitesApril 21, 2026
A great calibration (tune) is about accuracy which begins with the equipment providing the data - sensors (read here) and software (read here). Sensor location is critical to achieving optimal…
Geoff GaitesApril 8, 2026
PERFORMANCE TUNING EXCELLENCE: THE TTS MASTERTUNE ADVANTAGE To our Valued Customers, When you invest in performance modifications for your Harley-Davidson—whether it’s a high-flow exhaust, a performance air cleaner, or a…
Geoff GaitesMarch 13, 2026
Let's Get Technical N Alpha A relatively simple design, N Alpha systems use only engine speed and throttle angle to calculate the amount of fuel needed by the engine.…
cubicJuly 15, 2023
This is where the precision customizing takes place. When it must be done and it has to be right, we take matters into our own hands. Not only standard procedures…
Geoff GaitesJanuary 12, 2023
Stock on all 2023-1/2 and later center cooled models, 2020 LiveWire™, CVO™, Police and Trike models and optional on all 2020 Touring models in the U.S. (except Electra Glide® Standard…
cubicJuly 8, 2020
Located in Costa Mesa, California, is a shop called The Harley Doctor, and the owner, Geoffrey Gaites, has been healing sick bikes since 1996. He has a PHD in Harley…
cubicJune 26, 2018
You can build your Harley any way you want, but when you're done, it's still a Harley. This statement has been made countless times by countless people allegedly wise in…
cubicAugust 22, 2015
CYCLEDOCTOR: Harley-Davidson Health Specialists from Geoff Gaites on Vimeo. Specializing in American V-Twins
Geoff GaitesFebruary 11, 2014
Complete newbie; less than an amateur. Never ridden on a dirt track. This Honda CRF 450 isn’t even warmed up and already my heart is racing. This is the famous…
Geoff GaitesDecember 28, 2013