Technical Discussion Topics related to Technical Issues

Carb sync - Idle set - Idle drop - Video Inside

Old 04-11-2015, 11:53 AM
  #1  
Senior Member
SuperBike
Thread Starter
 
Join Date: Feb 2013
Posts: 1,509
thedeatons is on a distinguished road
Carb sync - Idle set - Idle drop - Video Inside

What do you guys think of this sync... I still see the idle wavering a bit, but that could just be the v-twin, eh? (Still getting used to syncing a twin. Done lots of i-4's).

I tried to do an idle drop, but i installed jack's screws with pruple loctite and now they won't budge with only my fingers

I'm going through all this because i still can't get my bike to run on the choke... And Hawk won't help me (LOL)...

http://youtu.be/QB7dBa5kHfA

James
thedeatons is offline  
Old 04-11-2015, 12:16 PM
  #2  
Rex Kramer-Thrill Seeker
SuperBike
 
CruxGNZ's Avatar
 
Join Date: Jan 2011
Location: Brookfield, WI
Posts: 2,312
CruxGNZ is on a distinguished road
The video shows your carbs not sync'd yet, but the idle sounds decent.

I use the same Two Bottle method and really like it.

Last edited by CruxGNZ; 04-11-2015 at 12:19 PM.
CruxGNZ is offline  
Old 04-11-2015, 12:19 PM
  #3  
Senior Member
SuperBike
Thread Starter
 
Join Date: Feb 2013
Posts: 1,509
thedeatons is on a distinguished road
2nd video. I reset the idle to 1200. Reset the levels in the carb sync bottles. Temps are higher here, but the tach variance is definitely looking better at idle. Thoughts?

http://youtu.be/nHX0bZnOjiQ

(Sorry, i posted the wrong link before. Here is the correct link)

James

Last edited by thedeatons; 04-11-2015 at 01:09 PM.
thedeatons is offline  
Old 04-11-2015, 01:02 PM
  #4  
Rex Kramer-Thrill Seeker
SuperBike
 
CruxGNZ's Avatar
 
Join Date: Jan 2011
Location: Brookfield, WI
Posts: 2,312
CruxGNZ is on a distinguished road
Get the air out of the crossover line. Adjust your carbs, so that the level of fluid in each bottle is the same. Then your carbs are balanced.
CruxGNZ is offline  
Old 04-11-2015, 01:09 PM
  #5  
Senior Member
SuperBike
Thread Starter
 
Join Date: Feb 2013
Posts: 1,509
thedeatons is on a distinguished road
Please see corrected link above.
thedeatons is offline  
Old 04-11-2015, 01:18 PM
  #6  
Rex Kramer-Thrill Seeker
SuperBike
 
CruxGNZ's Avatar
 
Join Date: Jan 2011
Location: Brookfield, WI
Posts: 2,312
CruxGNZ is on a distinguished road
There ya go. Perfectly balanced carbs now

When you rev the engine up, on the way back down, you have a hesitation or "hang" at 2,000-2,200 RPM's. This indicates you are lean at idle. Try to break those fuel screws free of that Locktite and give them a half turn out and see how she is.

You really don't need Locktite on the fuel screws. Those springs keep pressure on the screws preventing them from backing out.

Last edited by CruxGNZ; 04-11-2015 at 01:24 PM. Reason: Wording
CruxGNZ is offline  
Old 04-11-2015, 01:40 PM
  #7  
Senior Member
SuperBike
Thread Starter
 
Join Date: Feb 2013
Posts: 1,509
thedeatons is on a distinguished road
I just restarted the bike, now at a lower temp. Not much of a hanging tach needle now... Here is video 3.

http://youtu.be/RqjHQPjXQqs

James
thedeatons is offline  
Old 04-11-2015, 03:11 PM
  #8  
Senior Member
SuperSport
 
thetophatflash's Avatar
 
Join Date: Jan 2005
Location: Nooksack WA
Posts: 830
thetophatflash
Looks good!
thetophatflash is offline  
Old 04-12-2015, 01:44 PM
  #9  
Senior Member
SuperBike
Thread Starter
 
Join Date: Feb 2013
Posts: 1,509
thedeatons is on a distinguished road
So you guys think that is good? Tach variance looks normal?

The bike still won't run on the choke when cold... Back to posting in my choke help thread

James
thedeatons is offline  
Old 04-12-2015, 04:00 PM
  #10  
Rex Kramer-Thrill Seeker
SuperBike
 
CruxGNZ's Avatar
 
Join Date: Jan 2011
Location: Brookfield, WI
Posts: 2,312
CruxGNZ is on a distinguished road
I know I'm the only one who has been posting in this thread, so I'm assuming that its because other members feel the same. Your carbs look perfectly balanced now and the idle sounds like all the other Superhawks I have heard, which is + or - ~100 RPM's. I would guess that is just a trait of our V-Twin engine. It won't be almost rock solid like a inline 4.
CruxGNZ is offline  
Old 04-12-2015, 04:24 PM
  #11  
Senior Member
SuperBike
Thread Starter
 
Join Date: Feb 2013
Posts: 1,509
thedeatons is on a distinguished road
Thank you. Case closed on this one then. Hopefully these videos will help someone in the future

James
thedeatons is offline  
Old 06-21-2015, 01:19 PM
  #12  
Senior Member
SuperBike
Thread Starter
 
Join Date: Feb 2013
Posts: 1,509
thedeatons is on a distinguished road
Case reopened on this, as I just unscrewed my adjustable mixture screws, out by 1/4 turn each... Now it won't idle when cold again.

It's amazing how sensitive these carbs are to adjustment! Looks like I need to re-sync again


James
thedeatons is offline  
Old 06-21-2015, 01:57 PM
  #13  
Senior Member
SuperBike
 
kenmoore's Avatar
 
Join Date: Mar 2012
Location: New South Wales Australia
Posts: 1,524
kenmoore is on a distinguished road
I did the mixtures on mine with the sync tool still attached .

I found that the rear mixture had to be set different to the front to get a perfect sync.
kenmoore is offline  
Old 06-21-2015, 06:25 PM
  #14  
Rex Kramer-Thrill Seeker
SuperBike
 
CruxGNZ's Avatar
 
Join Date: Jan 2011
Location: Brookfield, WI
Posts: 2,312
CruxGNZ is on a distinguished road
Originally Posted by thedeatons View Post
Case reopened on this, as I just unscrewed my adjustable mixture screws, out by 1/4 turn each... Now it won't idle when cold again.

It's amazing how sensitive these carbs are to adjustment! Looks like I need to re-sync again


James
This is a cold engine with the choke out, correct? And it still won't idle? 1/4 turn out shouldn't have affected it THAT much.
CruxGNZ is offline  
Old 06-21-2015, 09:11 PM
  #15  
Senior Member
SuperBike
Thread Starter
 
Join Date: Feb 2013
Posts: 1,509
thedeatons is on a distinguished road
Yah it did, i was surprised too.

I'll try and resync tomorrow.

It was perfect before tweaking the screws


James
thedeatons is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jeephawk
Technical Discussion
15
02-13-2012 03:55 PM
tomzxt
General Discussion
6
05-27-2011 03:54 PM
JamieDaugherty
Modifications - Performance
2
04-26-2009 10:08 AM
Springbubba
Knowledge Base
2
08-14-2008 08:25 AM
supermarto
General Discussion
16
12-13-2007 09:55 PM


Thread Tools
Search this Thread
Quick Reply: Carb sync - Idle set - Idle drop - Video Inside


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

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.