This upgrade may not provide the same "seat of the pants" increase in power as the above recommendations, but every little bit counts. 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. The goal is to have the open end of the electrode facing the exhaust valve after the spark plug has been tightened. Indexing the spark plug will help clear the combustion chamber of unwanted gases. INDEX THE SPARK PLUG: This is an old trick that hot rodders have been doing for years. Cost: $6.00 The stock carburetor can also be upgraded with a GX140 emulsion tube for more low end power.
After trying a few different main jets and checking spark plug readings, we ended up with a #90 main jet. 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. Honda or clone, 6.5hp or 13hp, these engines like to breathe. Upgrading to a high flow air filter will net another increase in power. HIGH FLOW AIR FILTER: The stock air filter is also very restrictive. This is a simple upgrade and fairly inexpensive. Upgrading to a high flow header is a big performance enhancement. After seeing the inside of a stock muffler, we were surprised our 6.5hp Honda could even run with the stock exhaust. HIGH FLOW EXHAUST: The stock exhaust is very restrictive. We installed 18LB Valve Springs and it was a very simple upgrade allowing us to spin our engine up to 6500 rpm. Installing stiffer valve springs will allow the engine to spin more than 5200 rpm. UPGRADING VALVE SPRINGS: After the governor is removed, the stock valve springs will begin to float and limit your rpm to about 5200. The extra RPM provides a dramatic increase in performance. When the governor is removed, RPM will increase to about 5200. REMOVE THE GOVERNOR: When upgrading your engine, the first modification we recommend is removing the governor. If you are racing or just out to have fun, these basics are a great way to start opening the potential of your engine. The hop up parts and performance information on this page will work on your GX160, GX200, Blue OHV clone engine as well as other karting engines. The following modifications were performed on our 6.5hp Honda GX200 with great results.
We offer these suggestions with the beginner in mind. Don't let your limited budget interfere with your desire to go faster. In this section we cover several modifications you can perform on your engine for little or no cost.
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