How do I Derestrict my 5 Speed Yamaha FZX750?
It is acknowledged that the 5 Speed version of the FZX750 has some restriction upon the engine. This is due to the fact that in Japan these bikes are used for training purposes. The 6 Speed version available to some parts of the world is to be considered a full power model. The restriction manifests in 2 specific forms: 1. Top Speed restriction 2. Air Box Restriction 1. Top speed restriction can be bypassed faily easily. You need to obtain a speedometer converter from a company such as M&P (www.mandp.com) They sell a gold coloured mechanical converter that fits down by the FZX frontwheel. What this converter then does is move the speed restriction from say 200KPH to 200MPH!! Thus making it irrelevant. 2. The air box restriction is a bit trickier but nothing past the average home mechanics ability. i. Remove the air box lid and you will see that there is a rubber bung that fits half way down the inside of the Air Filter Element. This has to be removed. ii. Examine the lid of the air box
