Performance DIY by DIY Guru

- Timing can affect performance. Know where your timing is set before making carb adjustments. A couple of degrees can make a big difference in acceleration characteristics. Properly setting timing may cure ills without getting into carbs. Gearing can also be a significant factor.  - Exhaust pipes/baffles MUST be clean. Clogged pipes can kill top end. - Excess carbon on pistons can cloud tuning issues. - Air leaks and/or bad crank seals can affect tuning. A leak down test is strongly recommended. - Low compression can't be compensated for with tuning. - Change in fuel grades or blends can make tuning requirements change. It is best to use premium fuel. - Before making any adjustments be sure the carbs and jets are clean. That means ALL jets... pilot, needle jet, and main, are removed and inspected/cleaned. Carb body passageways should be blown out with brake cleaner or soaked in carb cleaner for several hours and blown out with compressed air. T...