ADVrider

Go Back   ADVrider > Bikes > Old's Cool > Airheads
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 04-29-2012, 06:05 PM   #1
2GbeemerLUV OP
Bavarian Motor Pie
 
2GbeemerLUV's Avatar
 
Joined: Mar 2012
Location: philadelphia, pa
Oddometer: 51
Question Pullin' the Plug

I'm trying to balance my carbs (bing 53). The bike seemed a little wobbly at idle so I decided to balance ala snobum by the shorting method. I started from 1 turn out on the air mix screw and 2 out on the throttle screw as a base. After the warm up, the left cylinder was responding to adjustments but the right cylinder was not affected by even drastic turns of the idle air screw. When i shorted the left, the right died. I pulled the plugs. Left cylinder plug was white/ weak, and the right was black as night. I changed the bad plugs. New plugs are Bosch platinum WR5DP, and gapped (.7mm). After only a few rounds of riding, shorting, and adjusting- I pulled the plugs again. Right was covered in soot and I couldn't take the popping and wobbles out of the idle.
Do I need to keep tinkering and practicing the method, or is there another problem? Not enough spark or coil pack/ wiring issue? Could it be a timing issue?
2GbeemerLUV is offline   Reply With Quote
Old 04-29-2012, 07:22 PM   #2
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,830
Usually what you are describing is caused by either the carb or leaking valves. If the float level and idle circuit is OK, chances are a leak down will reveal a leaking valve.
supershaft is offline   Reply With Quote
Old 04-29-2012, 07:59 PM   #3
2GbeemerLUV OP
Bavarian Motor Pie
 
2GbeemerLUV's Avatar
 
Joined: Mar 2012
Location: philadelphia, pa
Oddometer: 51
Thanks supershaft. What's the best way to determine which it is? Are we talking about a leaking valve cover gasket? There are no visible leaks on the head
2GbeemerLUV is offline   Reply With Quote
Old 04-29-2012, 08:09 PM   #4
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,830
It takes a leak down tester to find a leaking valve. You need a air compressor to use one of those. It sounds like you don't have one. Get a manual and go through the carb's idle circuit and float level. Test that cylinder's plug cap or run it in pitch darkness and see if it is arcing right when it isn't idling right. If you don't run across the trouble by then get someone to check for a leaking valve.
supershaft is offline   Reply With Quote
Old 04-29-2012, 08:38 PM   #5
wirewrkr
the thread-killer
 
wirewrkr's Avatar
 
Joined: May 2008
Location: HIGH desert
Oddometer: 4,295
You might want to start by adjusting the valves.
ALWAYS adjust the valves before doing a carb balance.
__________________

www.wirewerkes.com
KILL YOUR TELEVISION !!!!
wirewrkr is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 11:45 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014