Powervalve information for Yamaha Suzuki Kawasaki and Honda motorbike exhausts

Exhaust Powervalves

Yamaha are associated with the first reliable and consistent powervalves having fitted theirs to later model RD and RZ two-stroke road bikes, dirt bikes like the DT125/250 and even enduros like the YZ125/250.

These early valves were known as YPVS the (Yamaha PowerValve System) and were soon followed by the legendary EXUP (Exhaust Ultimate Power Valve).

Consistent results were produced by Yamaha and they went on to fit the YPVS in the OW35K which was the first race bike to have a powervalve system fitted. In 1977 this machine went on to win the Finnish GP.

But Yamaha aren't alone, oh no! Suzuki have their AETC and Super AETC systems, Honda has V-TACS and Kawasaki KIPS etc. Manufacturers aren't turning away from this technology and you will find similar devices fitted to many of today's most popular sports, trials and superbikes.

Each manufacturers system is completely different, ranging from quite simple electro-mechanical systems to intricately balanced rack and pinion mechanisms directly bored into the combustion chamber.

Powervalve's take many forms from direct port valve mechanisms that automatically de-coke themselves to in-line exhaust pressure valves that are servo driven to work in synch with the throttle.

Each system is a subject matter in it's own right so we've added a number of specific powervalve links in our Links section. If your particular model isn't listed please email us for assistance, just click here.

The essential problem with many of the powervalve systems is simply this;

The exhaust environment in two stroke and four stroke motorbikes is very different but powervalve systems share some common factors; high temperature, exhaust residue / coking, corrosion, friction and wear.

Not a great combination of environmental conditions so it can be no surprise that these devices are prone to seizure, fatigue and ultimately failure.

There's no easy fix if you wish to keep optimum bike performance other than regular maintenance, however, maintenance frequency can be reduced by lubricating the moving parts with a specialist product like Exup Juice.

Exup Juice resists temperatures to over 2000°F, it has anti-corrosive properties for any coated or matting surfaces and does not congeal in the exhaust environment like copper based and similar products can.

In our tests Exup Juice has been proven to significantly outlast the lubrication properties of copper based products whilst reducing wear and protecting against corrosion.

The result is a free moving, longer lasting solution that ensures optimum performance, better fuel economy and reduced chances of failure / fatigue, not to mention a more confident ride!

To find out more simply click here.

Exhaust Powervalves

Yamaha are associated with the first reliable and consistent powervalves having fitted theirs to later model RD and RZ two-stroke road bikes, dirt bikes like the DT125/250 and even enduros like the YZ125/250.

These early valves were known as YPVS the (Yamaha PowerValve System) and were soon followed by the legendary EXUP (Exhaust Ultimate Power Valve).

Consistent results were produced by Yamaha and they went on to fit the YPVS in the OW35K which was the first race bike to have a powervalve system fitted. In 1977 this machine went on to win the Finnish GP.

But Yamaha aren't alone, oh no! Suzuki have their AETC and Super AETC systems, Honda has V-TACS and Kawasaki KIPS etc. Manufacturers aren't turning away from this technology and you will find similar devices fitted to many of today's most popular sports, trials and superbikes.

Each manufacturers system is completely different, ranging from quite simple electro-mechanical systems to intricately balanced rack and pinion mechanisms directly bored into the combustion chamber.

Powervalve's take many forms from direct port valve mechanisms that automatically de-coke themselves to in-line exhaust pressure valves that are servo driven to work in synch with the throttle.

Each system is a subject matter in it's own right so we've added a number of specific powervalve links in our Links section. If your particular model isn't listed please email us for assistance, just click here.

The essential problem with many of the powervalve systems is simply this;

The exhaust environment in two stroke and four stroke motorbikes is very different but powervalve systems share some common factors; high temperature, exhaust residue / coking, corrosion, friction and wear.

Not a great combination of environmental conditions so it can be no surprise that these devices are prone to seizure, fatigue and ultimately failure.

There's no easy fix if you wish to keep optimum bike performance other than regular maintenance, however, maintenance frequency can be reduced by lubricating the moving parts with a specialist product like Exup Juice.

Exup Juice resists temperatures to over 2000°F, it has anti-corrosive properties for any coated or matting surfaces and does not congeal in the exhaust environment like copper based and similar products can.

In our tests Exup Juice has been proven to significantly outlast the lubrication properties of copper based products whilst reducing wear and protecting against corrosion.

The result is a free moving, longer lasting solution that ensures optimum performance, better fuel economy and reduced chances of failure / fatigue, not to mention a more confident ride!

To find out more simply click here.