Just want to share this ive read in a booklet
3 steps to build a 4-stroke tuning engine
In the search for getting more power out of your 4-stroke, we suggest you optimize the intake-system at first.
The more combustible air/fuel-mixture the engi e can breathe, the more power will be generated .
Therefore, it is a good idea to help the air get in by using additional air-vents in the air cleaner case and a
K&N filter which is of much higher air flow capability than the standard filter.
These modifications will make a noticeable difference in performance, but to get even
more, you should also help the burnt gases to get out by using an efficiently tuned exhaust system.
Check your carburetor settings and change the jets, if needed.
The use of a high performance spark plug and a high efficient ignition system is highly recommended.
The second step to more power is to use one of our specially tuned performance carburetors or,
if not available for your bike, to optimize your stock carb with a Dynojet-kit.
Thus you alter not only the quantity but also the quality of incoming mixture.
The result will be a big fat power curve!
Until now, it was mainly bolt-on mods. For further improvement,
you need to strip the engine and seriously modify the internals.
To help the engine breathe, the ports should be modified by using a flow bench.
A camshaft with optimized timing also helps a lot, but in most cases, you will have to fit stronger
valve springs to keep the rockers following the cam accurately, even at higher rpm.
To make the valve train last, it is a good idea to use special bronze valve guides
with their superior thermal conductivity and wear resistance.
You will also find a good amount of power by fitting one of our big bore piston kits with forged
pistons. Nothing beats cubic inch!
To make things last and to keep vibrations to a minimum,
it is recommended to get the crankshaft lightened and finely balanced
and perhaps to use a stronger conrod .
To keep the oil temperature low, you will probably need an oil cooler.
Stronger clutch springs will make sure you get the power to the wheel.
3 steps to build a 4-stroke tuning engine
In the search for getting more power out of your 4-stroke, we suggest you optimize the intake-system at first.
The more combustible air/fuel-mixture the engi e can breathe, the more power will be generated .
Therefore, it is a good idea to help the air get in by using additional air-vents in the air cleaner case and a
K&N filter which is of much higher air flow capability than the standard filter.
These modifications will make a noticeable difference in performance, but to get even
more, you should also help the burnt gases to get out by using an efficiently tuned exhaust system.
Check your carburetor settings and change the jets, if needed.
The use of a high performance spark plug and a high efficient ignition system is highly recommended.
The second step to more power is to use one of our specially tuned performance carburetors or,
if not available for your bike, to optimize your stock carb with a Dynojet-kit.
Thus you alter not only the quantity but also the quality of incoming mixture.
The result will be a big fat power curve!
Until now, it was mainly bolt-on mods. For further improvement,
you need to strip the engine and seriously modify the internals.
To help the engine breathe, the ports should be modified by using a flow bench.
A camshaft with optimized timing also helps a lot, but in most cases, you will have to fit stronger
valve springs to keep the rockers following the cam accurately, even at higher rpm.
To make the valve train last, it is a good idea to use special bronze valve guides
with their superior thermal conductivity and wear resistance.
You will also find a good amount of power by fitting one of our big bore piston kits with forged
pistons. Nothing beats cubic inch!
To make things last and to keep vibrations to a minimum,
it is recommended to get the crankshaft lightened and finely balanced
and perhaps to use a stronger conrod .
To keep the oil temperature low, you will probably need an oil cooler.
Stronger clutch springs will make sure you get the power to the wheel.
