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This Tuning Manual ebook contain information about the Carburetor system, structure and how to tuning up, We have found that Harley-pattern engines tend to develop minor air leaks between the manifold and heads. These leaks affect air/fuel mixtures at low throttle settings and can be troublesome at idle. For best performance, it is important that you test for and eliminate any such leaks. HSR tuning system : The HSR carburetor is divided into four interdependent systems:
1. Choke system
2. Idle system
3. Main system
4. Accelerator pump system

Each of these systems has its major effects in a different throttle range. While there may be some overlap, each system can generally be treated as though it is completely responsible for air/fuel mixtures within its range of throttle settings. Three of the systems have replaceable components that allow fine-tuning should the need arise. The following tuning methods require riding the motorcycle on the open road and the use of full throttle. This can be dangerous and, if you choose to use either to these techniques, be aware of your surroundings and personal safety. Setting and adjustment : The standard nozzle size is #70. If the engine seems to run too rich when the throttle is first opened, the nozzle may be too large and the fuel delivery rate too high. In this case, fit a smaller nozzle. The #1 screw is normally adjusted to establish a gap of about 2mm (0.080 inches) between the white plastic lever and pump rod end. If there is a hesitation just off idle, reduce the gap. Complete tuning guide consist of 20 pages..

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