YAMAHA BLASTER ALL YEARS:
This kit was specifically designed for a Blaster with a 240 kit/stroker crank or heavily ported stock cylinder. We are very aware of the H.P. the Blaster is capable of making with all the mods that are available for this quad. We took our STD heavy duty clutch kit with the extra friction plate and added springs that are 25-30% stiffer (compared to 10-15% STD kit) to help handle the higher H.P. Blasters. This kit can be used for all around riding and or drag racing.This kit is proven to be the best clutch kit available for a modified Blaster.
We have been an ATV Dyno tuning facility since 1999. During this time we have logged over 15,000 Dyno runs on ATVs. From the beginning, the most common thing we saw from quad to quad was that the clutch would slip under heavy load. This is instantly noticed when a quad is being Dynoed, because the rear of the bike is strapped down to the drums on the Dyno so that the tires do not slip and you can register horsepower.<></>
When the tires are unable to spin freely like they do in the dirt, the entire load of the motor is held solely by the clutch. If it is weak, poor quality or badly worn it will break loose and the motor will rev up and the quad cant put all the power to the ground.
1. We use cork style friction plates with a metallic base. We have tried all the different friction compounds available and these were the most durable. Kevlar type frictions had good wear properties but glazed over very quickly and started slipping compared to cork.
2. The steel plates are the most important component in the strength and durability of a good quality clutch kit. Our steels are smooth on both sides and full size unlike the half moon shaped stock steel plates, most clutch kits have dimpled or textured steel plates. THESE STEEL PLATES DO NOT LAST AS LONG AND DO NOT HOLD AS MUCH HORSEPOWER AS SMOOTH PLATES. "Dimples" are concave in shape and reduce surface material and contact area causing the clutch to slip easier. We have done tests where we had quads that had a slipping clutch (the clutch that was in it was new). We took the dimpled steels out and replaced them with smooth steels and the clutch stopped slipping.
3. Springs are equally important, we use a spring that is 10%-15% stiffer than stock. This helps with pressure on the friction and steel plates limiting clutch slippage.
4. For the Blaster we have added an extra full size friction plate. This gives you the opprtunity to remove and replace the larger I.D. friction plate that fits over the steel ring and wave washer and use a full size friction. This will give you more clutch contact surface area reducing slippage and capable of handling higher H.P. This kit works well with 240 big bore kits that can more than double the stock horsepower. The purpose of the wave washer is to cushion the clutch engagement, removing it has been a common practice for many years and will not affect the perfromance of the clutch. We still include the standard larger I.D. friction incase you want to run it. This is the only clutch kit on the market that offers you this option.