I finally found the cause

[gustovh]

If you read my other thread on the lean condition that SuzieQ had, you know that I had been fighting it for a while. Spotless carbs with all new seals and rings and still a runaway idle. So I decided to start at the beginning and ran a compression check, not so good, 90lbs. Across the board. Adjusted the valves and got 150+ on all 4. So decided to start and run her before reassembly. Turned on the fan and let her warm up real good, good throttle response and steady idle at 1000. Blip the throttle and drops right back to idle without hanging. Took her for a ride after putting her back together and all is right with the world.

i never knew tight valves could mimic a vacuum leak.

V

[Cipher]

If you read my other thread on the lean condition that SuzieQ had, you know that I had been fighting it for a while. Spotless carbs with all new seals and rings and still a runaway idle. So I decided to start at the beginning and ran a compression check, not so good, 90lbs. Across the board. Adjusted the valves and got 150+ on all 4. So decided to start and run her before reassembly. Turned on the fan and let her warm up real good, good throttle response and steady idle at 1000. Blip the throttle and drops right back to idle without hanging. Took her for a ride after putting her back together and all is right with the world.

i never knew tight valves could mimic a vacuum leak.

V

In some far off land called Nihon legend has it that a magical tome called an owners manual had a matrix of necessary preventative maintenance.
When followed valves remain in proper design parameters.

[Big T]

Now, now

I don't remember how many bikes Gustav owns. 8? 13?
It's easy to forget the maintenance schedule of one when you have many.

Plus, he's a genuine geezer

[gustovh]

Now I resemble that. Last set 5,000 miles ago. Must have set them at the low end, been fighting it for a few hundred. Would disappear for a while then return…finally didn’t go away. Thus the previous thread.

i have 13 bikes now Todd, with the addition of the 650Savage, and I only 73. Want to take a tour next summer, I need someone to pick up my bike these days.

V

[Brendan W]

All those years I've been checking valves instead of replacing intake seals....... Duh!

[salty_monk]

They must have been pretty tight when last set to have that affect at 5,000 miles. How much movement did you find in there? (I always write it down but with 13 to look after maybe not!).
A good reason for writing it down - if a lot of movement in a valve suddenly appears that would generally mean something more serious going on.

Glad you got to the bottom of it!

[gustovh]

They must have been pretty tight when last set to have that affect at 5,000 miles. How much movement did you find in there? (I always write it down but with 13 to look after maybe not!).
A good reason for writing it down - if a lot of movement in a valve suddenly appears that would generally mean something more serious going on.

Glad you got to the bottom of it!

I believe that I just set them too tight at the last adjustment. She has over 40,000 on her and runs strong. Just a new one on me, I set them to the loose side this time. Cheers

V