stock bike for 64 rear wheel horsepower. You can create this powerful Stage 1
engine using parts from your local Harley-Davidson dealer.
modifications and upgrades are second only to exhaust system upgrades when
you get a new bike. Here are some inexpensive modifications, CV parts numbers for upgrades
and tuning tips for all carburetors.
The ability of a new ignition system on
an engine to produce additional horsepower is overrated. Does that ignition system really
add horsepower? And what about single versus dual fire ignition? And don't forget about
ignition coils and spark plug wires. If you were confused, a little information should
help clear the air.
A performance camshaft is the order of the
day when the desire for additional horsepower hits you after your Stage 1 tuning. You have
just moved into Stage 2 engine territory. What is the correct camshaft to meet your need
for speed and power? The Motorcycle Performance Guide provides some tips for picking
your camshaft and the most extensive list of camshaft specifications for
Harley-Davidson engines available anywhere.
Cylinder head changes, porting and polishing
are the buzz words when it comes to making high horsepower. What does a "good"
set of heads look like? What does polishing really do for an engine? There are things that
can be done to an engine that might give better results that big ports, giant intake
valves and a fancy polishing job.
Want to know what engine modifications work?
Here is an extensive group of mild to wild engine combinations producing horsepower to
well over 150. A dyno sheet and a detailed list of the engine components are included with
each description. From mild Stage 1 engines to wild Stage 4 engines, you'll find something
of interest to you.
The drive train in your Harley-Davidson
is an overlooked item. Overlooked until something fails. When your engine combination is
above Stage 1, it is important that you have a heavy duty clutch and critical that you
know how to adjust a belt drive.
The Horsepower Gallery is your quick
reference for engine combination horsepower figures. Maximum horsepower figures are listed
for engine size, cylinder head work, camshaft, carburetor and pipes. If someone promises
your bike will make more horsepower than the engines listed here, make sure the shop
really knows what it is doing. If a shop doesn't dyno tune, beware of horsepower
promises over 70.