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Adjust Spark Plug Gap
A larger spark plug gap will create a larger spark and make more power.  The problem is, if you make the gap too large the spark will not...

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Indexing the spark plug
The goal is once you have the spark plug tightened down you want the electrode pointing at the exhaust valve like in the picture to the l...

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Lots of mods
This mini doodle bug has been upgraded to a Supermini! Upgrades include govenor removal, 18lb springs, lash caps, two stage straight header, RLV si...

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Mini Cafe Racer Tuning
It's so important to teach young people about mechanical things.  The younger generation is losing the ability to turn a wrench and handle basic re...

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Performance Basics
In this section we cover several modifications you can perform on your engine for little or no cost. Don't let your limited budget interf...

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49cc High Flow Air Filter
Here is our test bike.Santa Barbara, California makes an excellent location to build and test motorized bicycles due to the great beach w...

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Honda GX160 & GX200 Governor Removal
First remove the following: Gas tank Muffler Valve cover Spark plug Air filter box Now you need to place the engine at to...

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Mikuni Carburetor Tuning
There is a large amount of horsepower to be found in a properly tuned carburetor. Unfortunately, there isn't a universal setup that will ...

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Billet Rod & Flat Top Piston Installation
The following is a brief overview of the billet rod and flat top piston installation. The rod comes with detailed instructions which includ...

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Test New Page
The following is a brief overview of the billet rod and flat top piston installation. The rod comes with detailed instructions which includ...

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Modify Stock Muffler
Ideally when modifying a Honda GX200 or similar engine you will want to install a performance header.  The stock muffler pictured to the ...

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99cc HF Predator Modifications
Note: This is not a step by step "how-to" for building the 99cc Predator engine. By no means is this intended to be a complete set of instr...

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