RE-JET CARBURETOR: With the increased air flow from the header and high flow air filter, it's time to add more fuel to the combination. After trying a few different main jets and checking spark plug readings, we ended up with a #90 main jet. Cost: $6.00 The stock carburetor can also be upgraded with a GX140 emulsion tube for more low end power.
INDEX THE SPARK PLUG: This is an old trick that hot rodders have been doing for years. Indexing the spark plug will help clear the combustion chamber of unwanted gases. The goal is to have the open end of the electrode facing the exhaust valve after the spark plug has been tightened. Each indexing washer will change the position of the electrode by 1/4 turn enabling you to achieve the desired position of the electrode when the spark plug is installed. This upgrade may not provide the same 'seat of the pants' increase in power as the above recommendations, but every little bit counts.
