Sports star is Harley Davidson’s racer.
Since the sports star became a rubber mount, it did not change to a touring bike.
The possibility of the 4-CAM sports star is very high and will give 100 hp at 74 ci (1200 cc) without increasing engine displacement.
There is little information on rubber mount sports star, 100 horsepower since 2004, but special parts and special skills are not necessary to generate 100 horsepower.
It can be realized with engine tuning parts to be introduced in the future.
Generate 100 horsepower with a sports star
Engine Tuning Parts
cams is N3.
It is a standard camshaft which is extremely easy to handle even in town.
- Cylinder Head: Sundande Branch Head SportsStar 1200
- Camshaft: Andrews N3
- Throttle body: 51 mm HORSEPOWER INC (55 mm has more power but response is not good)
- Piston: JE
- Exhaust: D & D bobcat
- Air cleaner: RSD turbine (air intake efficiency is the highest)
- ECM: twintec G4
The point of horsepower improvement is the cylinder head
The heart of the engine is a cylinder head.
It is difficult to raise the power without increasing the efficiency of the cylinder head.
The horsepower of the engine is determined by the amount of air that can be sucked by the cylinder head.
The challenge of raising horsepower is to eliminate the loss of air.
The points are the following three points.
- Port polishing
- Valve seat cutting
- The shape of the combustion chamber
No matter what air cleaner, piston, cam, exhaust is used, the cylinder head is the most important.
https://speedfreak77.com/custom/headspistons%EF%BC%86top-end/cylinder-heads/
94.7 horsepower was generated with a sports star of mileage 72,000 km
- 2009 Sportsstar
- Engine displacement: 1200 cc (74 ci)
- Revolution: 7,200 rpm
- Power: 94.7PS
- Torque: 11.6 Kgm
Since the mileage was 72,000 kilometers, it generated 94.7 horsepower, so if you drive with a chain or if your mileage is less than 20,000 kim, about 5 hp will be raised.
“Sundance Branch Heads” has been changed to the compression ratio according to gasoline, so it will not be stalled even with low rotation with a strong torque.
In addition, camshaft improves intake efficiency, powerful from 4,000 rpm is also powerful, power continues up to 72,000 rpm.
Summary
The sports star has become a rubber mount (2004 ~), the weight has risen, many people feel that the image of the previous racer has thinned.
However, at present it is possible to set a limit setting impossible with a cab from low rotation to high rotation by injection tuning to a 55 mm big bore throttle body.
Moreover, since it is a rubber mount, 1200 strong vibrations no longer exist.
The current model is also capable of running sports satisfactorily, the total balance is beyond the rigid mount model.
https://speedfreak77.com/cutom-style/custom-base/sportster-caferacer/
https://speedfreak77.com/cutom-style/custom-base/custom-sportster/
XL-883 is also the most fun.
XL-883 is a stroke engine that is about 20% longer than any other Harley Davidson.
With the XL – 1200 you can run a winding road fun while turning the engine and actively selecting gears even at revolving speeds that you hesitate.
https://speedfreak77.com/cutom-style/custom-base/xl883/
Today, thank you for reading until the end.
ARIGATO BIKE
