Idle Issues

Old 07-31-2012, 09:21 PM
  #1  
Tech Regular
Thread Starter
iTrader: (19)
 
Join Date: Jun 2010
Location: AL/SoCal
Posts: 407
Trader Rating: 19 (100%+)
Default Idle Issues

I am breaking in a new motor and thought it was getting dialed in. Noticed that on the last tank when I was hit the breaks, the motor cut out. But starts right back up after a quick bump and idles fine.

Reedy VR 21 with RT4 plug and 30%. Running it rich for the break in with 7 tanks through it.

Any thoughts?
TeamOSG is offline  
Old 08-01-2012, 04:26 AM
  #2  
Tech Apprentice
 
Join Date: Sep 2011
Posts: 74
Default

Throttle linkage problem?

Leave the car off, turn on the electrics, take off the airfilter. Peep down the hole at neutral, should be about 0.5mm gap, now apply full brakes. Is that gap getting smaller? If so then thats your problem.
kingcoltzan1 is offline  
Old 08-01-2012, 05:31 AM
  #3  
Tech Master
iTrader: (40)
 
305M3's Avatar
 
Join Date: Dec 2008
Location: Florida
Posts: 1,183
Trader Rating: 40 (100%+)
Default

Originally Posted by kingcoltzan1 View Post
Throttle linkage problem?

Leave the car off, turn on the electrics, take off the airfilter. Peep down the hole at neutral, should be about 0.5mm gap, now apply full brakes. Is that gap getting smaller? If so then thats your problem.
+1. That would be my guess and something I've dealt with on too many occasions. I can't count how many times "incorrect" throttle/brake linkage setups have caused me headaches...
305M3 is offline  
Old 08-01-2012, 05:48 AM
  #4  
Tech Master
iTrader: (32)
 
sickpuppy1's Avatar
 
Join Date: Feb 2006
Location: Gardner,KS
Posts: 1,623
Trader Rating: 32 (100%+)
Default

Or a clutch shoe hanging up....in a bind or needs a washer under the shoe. washer between the clutchnut and the bearing...causes the shoe to hang against the bell. they can hang for a second and let go either way. Just another scenario to think about....
sickpuppy1 is offline  
Old 08-02-2012, 11:48 AM
  #5  
Tech Fanatic
iTrader: (5)
 
GizmoJunkie's Avatar
 
Join Date: Oct 2010
Location: Suwanee, GA
Posts: 999
Trader Rating: 5 (100%+)
Default

Throttle linkage and your idle (air gap) screw is usually the most common culprit. If you havent adjusted your idle screw to keep the carb open, it will simply shut off all air to the engine, causing it to stall. Take note of your air gap when you hit the brakes, what does it do? notice how the throttle link works, and has that spring on it. The idle screw stops the carb from closing.

Also already noted, you could have a clutch or even a flywheel nut problem. I had one time where i didn't tighten the flywheel/clutch nut enough and it would spin on the crankshaft. Since the clutch springs are captured by the groove in the nut (in that particular stock/kit clutch setup) it wore out the ends of the springs. In the end the springs held absolutely no tension on the shoes and the clutch would engage even on the starter box. As soon as i hit the brakes it would stall the engine.

Just something to think about and look into
GizmoJunkie is offline  
Old 08-03-2012, 12:31 AM
  #6  
Tech Regular
Thread Starter
iTrader: (19)
 
Join Date: Jun 2010
Location: AL/SoCal
Posts: 407
Trader Rating: 19 (100%+)
Default

Thanks all for the insight.
TeamOSG is offline  
Old 08-03-2012, 01:26 AM
  #7  
Tech Elite
iTrader: (3)
 
merdith6's Avatar
 
Join Date: Oct 2009
Location: Brazoria, TX
Posts: 2,350
Trader Rating: 3 (100%+)
Default Nice

Originally Posted by kingcoltzan1 View Post
Throttle linkage problem?

Leave the car off, turn on the electrics, take off the airfilter. Peep down the hole at neutral, should be about 0.5mm gap, now apply full brakes. Is that gap getting smaller? If so then thats your problem.
That is the most clearly worded answer to that problem. Nice Job.
merdith6 is offline  
Old 08-03-2012, 10:10 PM
  #8  
Tech Champion
iTrader: (14)
 
jmackani's Avatar
 
Join Date: May 2009
Location: Shippensburg
Posts: 5,694
Trader Rating: 14 (100%+)
Default

Or your settings are too rich. A lot guys make the mistake of opening the idle more when the engine is actually too rich on the bottom.
jmackani is offline  
Old 08-03-2012, 10:50 PM
  #9  
Tech Regular
iTrader: (18)
 
Losimoe's Avatar
 
Join Date: Aug 2010
Location: KL
Posts: 385
Trader Rating: 18 (100%+)
Default

most of the time the throttle linkage wont always shut back to the same idle gap. even with the linkage set correctly. always use a rubber band or a throttle return spring to consistently help close idle gap opening. rubber bands are so cheap, you can replace it every race.
Losimoe is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.