High Idle when engine is warm ***SOLUTION FOUND ***

Check your IDLE SCREW in the very center of your carbs. Turn it CCW to lower rpms. Take her for a short 10 min drive and then see where the RPMS are when you Idle, then try adjsuting the screw if your RPMS are above 1100. After your ride, then sync them. It works better if your engine is warm

 

Put another set of carbs on the bike, 4th was not firing right on the others. idle still high, but will run and adjust over the next couple of days.

 

Is it a maxium motor in the Seca?

 

I was thinking the same thing Hound...

 

No, I bought this bike two years ago, but serial numbers match.

This morning, it would not start. Pulled the plugs, they were bone dry. I squirted some gas down each cylinder and it started up, but the idle was all over the place. had to stop twice on the way to work to turn down or up the idle.

The vacuum line should pump gas down the fuel line, no? Am I drawing air from some other place.

 

The vacume pulls the diaphram in the petcock back so fuel can pass, run down.
I ask about the motor because the 650 Seca came with a non YICS motor.

 

I have two 1982 Seca 650's

The first is an XJ650RJ, silver with blue & white paint scheme, stock oil cooler, NON-YCIS motor

The second is an XJ650RJC, red with red & white paint scheme, stock oil cooler, YCIS motor

I am in Canada, and both these models were imported here in 1982. I do not think the Red was ever brought into the USA, hence the "C" in the model.

So this would point towards the petcock being a problem.

 

Very interesting I was under the impression that all 650 Seca's be it UK, Euro, US, Canada, were all non YICS.

To check your petcock.
Pull the fuel line from the carb.
Put the end in a container.
Turn the petcock to prime.
Fuel should flow freely, like fill a quart container in no time.
Fuel flows, good!
Turn petcock to the on position.
Start the bike, it idles quite a while on the bowls.
With the petcock in the on position, fuel should flow instantly.
If not check that the vacume line has not collapesed on it's self.
If line is good still no fuel petcock needs a rebuild but, you can run it on prime until you get it fixed, just remember to shut it off when you park.