The stock M8 throttle body is a 55mm and it has a plastic plenum that can change shape under load and also has been known to melt due to high cylinder head temps. Nothing is more disappointing then to take off an air intake to discover that the throttle body has failed.
Cycle Solutions Inc. is known for their top performing throttle bodies. You can squeeze more power from your M8 engine by switching out that plastic stock throttle body and replacing it with a CSR 70mm throttle body. We are getting huge horsepower gains with the M8 engines with a stage 1 and 2 cam upgrade so it is no surprise that there are even more gains to be achieved by replacing the stock throttle body with one of our 58mm, 62mm or 70mm CSR throttle bodies.
The size of throttle body is dependent on your engine size. Cycle Solutions can help you decide what throttle body you need based on your build.
Our dyno shows huge gains on the M8 engines when using our quality products. This dyno graph is for our 2017 Road King.
We installed the D&D Billet Cat exhaust system, a Thundermax auto tune module, CSR air intake, 58mm CSR throttle body and a T-man 216 Cam chest upgrade. This bike gained 38 horsepower which is incredible!