Technical Discussion Topics related to Technical Issues

Can't get it running right!

Old 07-18-2012, 07:06 AM
  #1  
Junior Member
Squid
Thread Starter
 
cbrcrx's Avatar
 
Join Date: Jul 2012
Location: Nashville
Posts: 9
cbrcrx is on a distinguished road
Can't get it running right!

I bought this Superhawk after it wasn't started for 3 years. I brought it home cleaned the carbs, replaced the fuel, replaced the spark plugs and installed a new battery. It fired right up. But, when I ride it, it pulls to about 4500 rpm and then runs like crap to redline. If I accelerate slowly it is better, but not right. Also it backfires a lot during deceleration and between gear changes. I went back and did the carb set up like suggested here and it idles perfectly smooth now, but still has the other problems. The bike is stock with a slip on muffler and I have worked on bikes for decades, but I can't figure this out. Help!
cbrcrx is offline  
Old 07-18-2012, 07:11 AM
  #2  
Senior Member
SuperBike
 
Wicky's Avatar
 
Join Date: Sep 2008
Location: Essex, UK
Posts: 1,638
Wicky is on a distinguished road
Have you looked to see if the airfilter needs replacing / cleaning if aftermarket.

Check for air leaks in exhaust/header system and carb intake.

is the timing right? (can easily be set 180 out, esp after head rebuild if CCTs have failed)

Are the vacuum hoses correctly fitted, not kinked and intact.

Last edited by Wicky; 07-18-2012 at 07:13 AM.
Wicky is offline  
Old 07-18-2012, 07:40 AM
  #3  
Slacker
Superstock
 
BeerHunter's Avatar
 
Join Date: Jun 2005
Location: San Antonio, TX
Posts: 489
BeerHunter is an unknown quantity at this point
Perhaps the vacuum line to the petcock is sucking on the wrong nipple.
BeerHunter is offline  
Old 07-18-2012, 08:33 AM
  #4  
Junior Member
Squid
Thread Starter
 
cbrcrx's Avatar
 
Join Date: Jul 2012
Location: Nashville
Posts: 9
cbrcrx is on a distinguished road
Everything you guys mentioned I have checked except the timing. If it was 180 degrees off I wouldn't think it would even run. The air filter is clean and oem. It only has 10k miles, so I would think it couldn't be something major. It realley fells like a needle problem, but the bike is pretty much stock and I've never had a slip-on cause a bike to run this poorly.
cbrcrx is offline  
Old 07-18-2012, 08:37 AM
  #5  
Senior Member
SuperBike
 
Wicky's Avatar
 
Join Date: Sep 2008
Location: Essex, UK
Posts: 1,638
Wicky is on a distinguished road
If it was 180 degrees off I wouldn't think it would even run
www.vtr1000.org • View topic - Timing 180 degree's out

If you're convinced the carbs are responsible, and eliminated the usual suspects, then take a gander at these threads:

https://www.superhawkforum.com/forum...leaning-27529/

https://www.superhawkforum.com/forum...-set-up-24769/

Last edited by Wicky; 07-18-2012 at 08:52 AM.
Wicky is offline  
Old 07-18-2012, 08:51 AM
  #6  
Banned
MotoGP
 
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
8541Hawk will become famous soon enough
Are the diaphragms seated properly in the carbs?

If they are I would then check the filter screen in the tank and the petcock to make sure the diaphragm is not damaged and that it is in the full "open" position
8541Hawk is offline  
Old 07-18-2012, 09:56 AM
  #7  
Junior Member
Squid
Thread Starter
 
cbrcrx's Avatar
 
Join Date: Jul 2012
Location: Nashville
Posts: 9
cbrcrx is on a distinguished road
Diaphram is good and I sucked on the petcock vacuum line and gas poured out. I am going to check the timing even though this motor has never been apart. Maybe one of the CCTs is bad.
cbrcrx is offline  
Old 07-18-2012, 10:01 AM
  #8  
Banned
MotoGP
 
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
8541Hawk will become famous soon enough
What about the carb diaphragms? It sounds like you know how to check if they are seated properly but did you check to see if one of them possibly has a pin hole in it?

Of course the other obvious question, that still has to be asked, did you sync the carbs?
8541Hawk is offline  
Old 07-18-2012, 10:04 AM
  #9  
When in doubt, C4
Squid
 
Join Date: Apr 2012
Location: Venice, FL
Posts: 72
Sawzall86 is on a distinguished road
Originally Posted by BeerHunter View Post
Perhaps the vacuum line to the petcock is sucking on the wrong nipple.

Ask me how I know of this situation
Sawzall86 is offline  
Old 07-18-2012, 10:12 AM
  #10  
Senior Member
SuperBike
 
Wicky's Avatar
 
Join Date: Sep 2008
Location: Essex, UK
Posts: 1,638
Wicky is on a distinguished road
If it was a CCT gone wrong you'd know about! Add that on the list of items to replace pronto with manual CCTs along with R/R (if you have an early unfinned one)

Are you sure the carbs are back on securely and the seals aren't hardened/perished, causing leaks?
Wicky is offline  
Old 07-18-2012, 10:56 AM
  #11  
aja
Senior Member
SuperSport
 
aja's Avatar
 
Join Date: Nov 2011
Posts: 700
aja is on a distinguished road
For my 2 cents, did you make note of which needles came out of which carb and did you put them back in the same? They are different sizes front to back.
aja is offline  
Old 07-18-2012, 01:26 PM
  #12  
Slacker
Superstock
 
BeerHunter's Avatar
 
Join Date: Jun 2005
Location: San Antonio, TX
Posts: 489
BeerHunter is an unknown quantity at this point
Check for blockage in the float bowl vents, and make sure the slide vents are not obstructed where they plug into the airbox.

You have twice mentioned the slip-on. This bike has dual mufflers. Has someone done a poor job at converting the exhaust to single?
BeerHunter is offline  
Old 07-18-2012, 01:35 PM
  #13  
Senior Member
Superstock
 
Join Date: Oct 2011
Posts: 344
blamecanada is on a distinguished road
Originally Posted by BeerHunter View Post
Check for blockage in the float bowl vents, and make sure the slide vents are not obstructed where they plug into the airbox.
You have twice mentioned the slip-on. This bike has dual mufflers. Has someone done a poor job at converting the exhaust to single?
I hack-jobbed mine into a single when the clamp on one side broke, and with some tuning it still hauls *** (and the bike is lighter than before).
blamecanada is offline  
Old 07-18-2012, 02:48 PM
  #14  
Senior Member
Back Marker
 
tbartley's Avatar
 
Join Date: Jan 2009
Location: Hills of Kentucky
Posts: 224
tbartley is on a distinguished road
Originally Posted by Sawzall86 View Post
Ask me how I know of this situation
PVLIR! Yes...be sure the petcock vac line is on the sideways nipple, not on the bottom nipple of the petcock It happens all too often.
tbartley is offline  
Old 07-18-2012, 02:49 PM
  #15  
When in doubt, C4
Squid
 
Join Date: Apr 2012
Location: Venice, FL
Posts: 72
Sawzall86 is on a distinguished road
Originally Posted by aja View Post
For my 2 cents, did you make note of which needles came out of which carb and did you put them back in the same? They are different sizes front to back.
Wanted to add about the Emulsion tubes and mains to check they were in the correct carbs as well. I dunno how far apart the carbs when the OP cleaned them, but it's something else to consider looking into if it wasn't already mentioned.
Sawzall86 is offline  
Old 07-18-2012, 07:41 PM
  #16  
Junior Member
Squid
Thread Starter
 
cbrcrx's Avatar
 
Join Date: Jul 2012
Location: Nashville
Posts: 9
cbrcrx is on a distinguished road
Everything in the carbs is correct. I checked the numbers on the needles and made sure the emulsion tubes were in the right place. The carb boots are good too. I do have a single exhaust, but I have hand made plenty of custom undertail exhaust with no problems. Also the idiot I bought it from was running with no mufflers at all and he had no complaints about it.
cbrcrx is offline  
Old 07-18-2012, 07:49 PM
  #17  
Banned
MotoGP
 
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
8541Hawk will become famous soon enough
Have you pulled the plugs and checked them?

If you say everything in the carbs and fuel system is fine then the only other thing is the ignition system, which would mean bad plugs or an issue with the coils or plug wires.

Are the wires push firmly in the boots? You possibly could pull the wires out of the boots to see if there is corrosion at the end of the wire also.
8541Hawk is offline  
Old 07-18-2012, 08:30 PM
  #18  
Junior Member
Squid
Thread Starter
 
cbrcrx's Avatar
 
Join Date: Jul 2012
Location: Nashville
Posts: 9
cbrcrx is on a distinguished road
I changed the plugs. I was starting to wonder if it wasn't a coil problem too.
cbrcrx is offline  
Old 07-18-2012, 08:43 PM
  #19  
Banned
MotoGP
 
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
8541Hawk will become famous soon enough
The plug wires just push into the boot, so I would first make sure one didn't get partially pulled out when you reinstalled them
8541Hawk is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
J Bragg
Technical Discussion
16
02-04-2011 06:32 PM
phillip
General Discussion
13
01-14-2008 11:13 AM
Anto
General Discussion
0
09-11-2007 12:14 AM
luiggispeed
Modifications - Performance
32
12-09-2005 06:46 AM
Dutch
Technical Discussion
5
07-02-2005 08:07 AM


Thread Tools
Search this Thread
Quick Reply: Can't get it running right!


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.

All times are GMT -7. The time now is 03:49 PM.


© 2019 MH Sub I, LLC dba Internet Brands