Carb Idle Issue

[SlowOldGuy]

Local ACE Hardware should have metric o-rings.

Remove the petcock and you should see (2?) screws that hold the diaphragm assembly together.  Remove the screws and GENTLY pry the diaphragm cover open.  You will remove the spring, and the diaphragm/plunger assembly.  Replace the o-ring on the diaphragm plunger, install the new spring, and carefully reassemble.

Remember to check the fuel outlet for tightness adn install a tiewrap.

DavidR.

[jamesearthdrum]

Hello folks,
My '89 has developed this issue.  However my idle will creep back up to 2K no matter what I do.  Anything different that I should be looking for than what I have read in the thread so far? Thanks,

james

[ozzstar]

Local ACE Hardware should have metric o-rings.

Remove the petcock and you should see (2?) screws that hold the diaphragm assembly together.  Remove the screws and GENTLY pry the diaphragm cover open. 
DavidR.

Thanks David! 

[jamesearthdrum]

Finally took a some time away from the bug project to get this sorted out.   Found a split in the vacuum hose connected to the #2 carb just before it connects to the restrictor. Cut the hose back reconnected, idle settled back to normal.   While I had things open I resynched the carbs. They were only slightly out and it's been over 2 years since done last. I also repaired a broken scoop tab and found that my collector is broken where the #3 head pipe attaches. It's just floating in the collector opening. I begin looking for a replacement starting, well, now. 

[jamesearthdrum]

Also a huge THANK YOU  to the contributors to this thread for the suggestions on what to look for. 

[SlowOldGuy]

Finally took a some time away from the bug project to get this sorted out.   Found a split in the vacuum hose connected to the #2 carb just before it connects to the restrictor. Cut the hose back reconnected, idle settled back to normal.

Glad you found the problem.

Once again (for anyone having a similar problem), the only way an engine will increase it's idle speed is if it's getting air from somewhere.  You can't dump extra fuel into the intake and get more speed, it takes extra air!

DavidR.