Technical Discussion Topics related to Technical Issues

Another carb question...

Old 08-07-2012, 05:57 PM
  #1  
Junior Member
Squid
Thread Starter
 
Join Date: May 2012
Posts: 6
ElBandito is on a distinguished road
Another carb question...

So, after riding around a bit today my bike decided it didn't want to run well at the 5K and above RPM range. It bogs down anytime I try to open the throttle, but is fairly smooth if I am easy up until about 5K and then the bike wants no part of it. In neutral it revs
Normally.

After changing the plugs and making sure the air filter is clean, I am inclined to think its in the carbs. Which is well enough.

Earlier in the day, before any symptoms and the bike was running well, the speedo died, and only the speedo, for about a minute before coming back to life. The speedo and other gauges have worked fine for the rest of the day.

My question; Before I take the carbs off, is there any chance there could be some electrical problem I am missing?
ElBandito is offline  
Old 08-07-2012, 05:59 PM
  #2  
Senior Member
SuperBike
 
RWhisen's Avatar
 
Join Date: Sep 2008
Location: Ft. Worth, TX
Posts: 1,605
RWhisen is on a distinguished road
Sounds as if your R/R may be on the way out.
RWhisen is offline  
Old 08-08-2012, 11:45 AM
  #3  
Banned
MotoGP
 
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
8541Hawk will become famous soon enough
Did you take the tank off? If so it's PVLIR
8541Hawk is offline  
Old 08-08-2012, 05:43 PM
  #4  
Junior Member
Squid
Thread Starter
 
Join Date: May 2012
Posts: 6
ElBandito is on a distinguished road
All hoses are/were correct. I was wandering if the speedo blip might have been related to the drivability problems. Everything checked out electrical wise.

Got the tank and box off today. I'm getting into the carbs tomorrow, thanks to silly in-law commitments, and I can't finish her today.

Anything else I might want to pay attention to while I'm in there, please let me know.

Gregg
ElBandito is offline  
Old 08-08-2012, 05:52 PM
  #5  
Senior Member
SuperSport
 
thetophatflash's Avatar
 
Join Date: Jan 2005
Location: Nooksack WA
Posts: 831
thetophatflash
R/RRRRRRRRRRRRRRRRR!
thetophatflash is offline  
Old 08-09-2012, 12:34 AM
  #6  
Junior Member
Squid
 
Join Date: Jul 2012
Location: East Midlands UK
Posts: 9
alternative_vtr is on a distinguished road
Regulator / Rectifier near seat under rear cowl. They over heat and fail. Change for another one, CBR125 model is on mine - twice as big as the VTR one and has fins all over it.
alternative_vtr is offline  
Old 08-09-2012, 02:23 PM
  #7  
Junior Member
Squid
Thread Starter
 
Join Date: May 2012
Posts: 6
ElBandito is on a distinguished road
I will change the R/R because I am aware of the failure possibility/guarantee. Though I do not believe that it's causing my problem.

This is my first go 'round with SH carbs. Is it necessary to drain the coolant or can I Tee them together or pinch them closed while I work?

Also, from what I've read there isn't much of a fuel filter on the hawk; has anyone tried adding a universal inline filter and if so thoughts or comments?
ElBandito is offline  
Old 08-09-2012, 02:33 PM
  #8  
Senior Member
MotoGP
 
7moore7's Avatar
 
Join Date: Jul 2010
Location: Phoenix, AZ
Posts: 3,867
7moore7 is on a distinguished road
Originally Posted by alternative_vtr View Post
CBR125 model is on mine - twice as big as the VTR one and has fins all over it.
Still shunt based though. May as well go MOSFET if you're getting a new one.
7moore7 is offline  
Old 08-09-2012, 02:54 PM
  #9  
GTS
Seasoned tech
SuperSport
 
GTS's Avatar
 
Join Date: Apr 2012
Location: Issaquah, WA
Posts: 576
GTS is on a distinguished road
Check your electrical grounds for any loose or caroded connections. A bad ground will give you all sorts of wired gremlins. It's kind of doubtful it's something in the carbs unless you got a bit of debris in there that is plugging up a jet or something. But you never know. While you're in them take the time to go through the carb set up thread and set them up accordingly.
GTS is offline  
Old 08-10-2012, 11:23 AM
  #10  
Banned
MotoGP
 
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
8541Hawk will become famous soon enough
If the hoses are on corcectly then it sounds like a R\R or a ground issue to me.
8541Hawk is offline  
Old 08-10-2012, 11:27 AM
  #11  
Banned
MotoGP
 
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
8541Hawk will become famous soon enough
Originally Posted by ElBandito View Post
I will change the R/R because I am aware of the failure possibility/guarantee. Though I do not believe that it's causing my problem.

This is my first go 'round with SH carbs. Is it necessary to drain the coolant or can I Tee them together or pinch them closed while I work?

Also, from what I've read there isn't much of a fuel filter on the hawk; has anyone tried adding a universal inline filter and if so thoughts or comments?
No need to drain the coolant and if the bike is cold the lines should be fairly empty, so no need to plug them either.

Even hot you will not loose much, so no worries there.

The fuel filters can and often do cause issues.

It is a gravity feed system and the common issue is fuel starvation at high RPM.

I have always just run the stock screen filter and have never had an issue.
8541Hawk is offline  
Old 08-19-2012, 01:23 PM
  #12  
Junior Member
Squid
Thread Starter
 
Join Date: May 2012
Posts: 6
ElBandito is on a distinguished road
Well, after going through the carbs and setting them up as the "carb setup" thread suggests the bike ran beautifully. Better than before. For about a week.

Today, I got a bit spirited on the road and the bike was pulling hard and strong. But at about 120 mph, she had enough. I started getting all the symptoms that I thought I had corrected; feels like I'm losing a cylinder at above 5K rpms in any gear. Revs fine in neutral.

I am mechanically inclined, but electrical isn't my thing. It seems that it's electrical at this point. So, what should I check before I take it to the shop? I have very basic electrical skills, and after reading the manual, an ignition system check is beyond my capabilities.

Help is welcome and greatly appreciated.

Thanks,
Gregg
ElBandito is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
semery98
Technical Discussion
9
06-12-2013 12:11 PM
geekonamotorcycle
Technical Discussion
21
05-24-2011 01:43 PM
mikstr
Modifications - Performance
20
01-17-2011 01:34 AM
supermatt996
Modifications - Performance
0
04-10-2009 06:21 PM
bdizzle
Technical Discussion
7
10-24-2007 04:37 PM


Thread Tools
Search this Thread
Quick Reply: Another carb question...


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.