XJ650L Power Up Kit Instructions Needed

Does anyone have a scanned copy of the Power Up Kit installation instructions they would be willing to share with me? My bike , produced in 3/82, never had it installed and the kit I bought didn't come with it. Thanks in advance! Chuck

 

I just sent you a PM, hit me up, and maybe I can help you out with the bike. Need to know what bike you have? Yr, 550----900? We live close to each other, so that might help out. I live in Warrens WI.

 

What on earth is a power up kit?

 

My apologies to all. The bike in question is a XJ650LK Seca Turbo. The power Up Kit was released by Yamaha as a measure to increase the bikes performance by giving it a boost pressure increase. My bike was produced before Yamaha made the change on the production line hence the need to release a kit to upgrade the bikes already on the road. I'd like to add it to my bike now....... I found a complete kit, but do not have the instructions to install it. Many thanks to all! Chuck

 

'82 Seca Turbos suffered from weak performance when they were initially introduced. Tired of being embarrassed by Honda CX500 Turbos in head-to-head tests Yamaha rushed out a "Power-Up" kit (free of charge!) that consisted of an inline boost pressure sensor/restrictor that fooled the turbo into thinking boost was lower than it was, and a washer that you stuck at the end of your right-side turbo exhaust muffler to increase back pressure. Both measures were designed to increase boost pressure and keep it in the cylinders longer. Peak boost went from an anemic 7 psi to a respectable 12 psi. The bad news for '82 Seca Turbo owners ('83 models came with the modification) is that Yamaha ran out of the kits in 1985. The good news is that you don't need it. Simply disconnect the vacuum hose leading to the wastegate actuator, clamp it shut, close up the hole in the actuator and experience the thrill of 14 psi. The poppet valve in the surge tank now serves as your "wastegate" to keep the engine from exploding. This also solves the problem of turbocharger wastegates failing to close, a common cause of power loss in Yamaha Turbos (blame it on the placement of the unit under the engine where it collects all sorts of road debris).

http://www.turbomotorcycles.org/TMIOA/Bike_Yamaha_XJ650.html

 

I don't believe this is good advice.
Relying on the poppet on the surge tank to limit boost, the turbocharger will already be spinning near it's maximum.
Take away the resistance and the RPM's on the turbocharger will go stratospheric.
You need to moderate the RPM's of the turbo unit at the inlet to keep it from grenading.

In my experience the Seca Turbo runs best with the stock set up, relying on the OEM wastegate actuator.
When I trigger the wastegate directly from #2 carb the system develops 9 psi.
The OEM actuator/wastegate will maintain 9 psi boost and this is very important.

I played with a boost controller and was seeing 16 psi.
Unfortunately when the boost controller trips, this 16 psi overwhelms the stock actuator and opens the wastegate too far and all boost is lost.
When you whack the throttle in the lower gears the Seca Turbo will easily exceed 16 psi.
Just when you're going for the next gear, the bike will lose all boost.

I found when rolling on boost in 5th gear you could almost get to redline before exceeding 16 psi, it was thrilling, but again only to the point when boost was lost.

If your bike has a vac tube running directly from compressor to the wastegate actuator, start by plugging the nipple on the compressor.
Take the pressure at #2 carb to trigger the actuator.
This will allow the system to generate 9 psi boost instead of 7.

In addition to this the power-up kit also included the cylinder widget in the vac line which delayed the wastegate to 11 psi.
I think once 11 psi was reached you would be limited to 9psi anyway once the wastegate opens.
I have a power-up puck somewhere, haven't tried installing it to see if it makes much difference.

 

UPDATE! I received my power up kit from a vendor in Canada and it did come with instructions. All said and one I am so glad I installed it versus simply disconnecting the waste gate. The bike now seems to have twice the power it had originally and runs beautifully in a linear fashion. The boost guage now immediately swings past the red zone when at full boost, and the bike goes like a Bat out a hell!