Technical Discussion Topics related to Technical Issues

Help Please, my hawks down

Old 07-04-2007, 01:22 PM
  #1  
Junior Member
Squid
Thread Starter
 
Join Date: Jul 2007
Posts: 5
SLOHawk83 is on a distinguished road
Help Please, my hawks down

I recently purchased an 03 SH with less than 3500 miles. Since then i have put on about 1500 miles. i have replaced the stock cans with Two Bros high mounts, replaced stock filter with a BMC, had it rejetted by a local mechanic, while at the same time he removed the emmissions control charcoal canister, i dont really know what that entitles. I have put about 800 miles on the bike since the work was done, and it has run excellent. About a week ago i had throughly washed my bike with water, for the first time. After i had dried it off with a towel as best i could i started it an jumped on the freeway for some air drying. It ran perfectly fine. I had then parked it and let it sit for about 3 hours. I then started it again and rode it into town. Before town i stopped to refuel. About 3 miles into town i noticed some backfiring/missing and the engine seemed to lag a bit. I tried to make it to a friends house but the bike would miss, backfire, stall out, lack of power, so i parked it and picked it up a little later with my truck.
I first thought that i had put in some bad gas. I took gas samples from the bottom of my float bowls and could see no visible signs of contamination. I still wasnt satisfied so i syphened the rest of the gas out of my tank and replaced it with chevron 91. I had then checked the airbox and filter for any signs of water or other contaminants. I started it up, and it seemed a little better when it was cold and the choke was on, but once it warmed up it was acting like crap and popping and missing on acceleration.
My next thought was that i had fouled a spark plug. I pulled each plug and noticed that both were a bit blackened and brown, so i replaced them also. Still runs like crap on acceleration after it has warmed up. Most of the missing and popping happens at around 2300 rpm and seems to only run on one cylinder after that.
I can only think now that there is something wrong with the electrical or the bike has some sort of vaccum leak.
I have read the thread that someone posted about kind of the same problem "popping missing help?" but my bike has never come apart and my vaccum hose does come from the rear of the fuel valve an all the other hoses seem to be in place.
I can only imagine it is something simple like a plug came off from somewhere or an electrical connection is loose.

please help, its the 4th of July and i cant even ride
SLOHawk83 is offline  
Old 07-04-2007, 02:09 PM
  #2  
Senior Member
SuperBike
 
RickB's Avatar
 
Join Date: Sep 2005
Location: Buffalo, NY
Posts: 1,572
RickB is on a distinguished road
Sounds like you may have a piece of dirt stuck in one of the carb passages blocking the fuel flow - when the choke is on you get more fuel and less air so it will run ok then. probably a good idea to pull the carbs and give the a good cleaning out.
RickB is offline  
Old 07-04-2007, 03:18 PM
  #3  
Senior Member
MotoGP
 
nuhawk's Avatar
 
Join Date: Sep 2006
Location: Austin, Tx
Posts: 4,138
nuhawk is on a distinguished road
I think bad gas! You have to blow both the bowls and reload the tank. Chas pumped his CBR full of water and we had to dry tow it around for nearly a half hour before we could get it to fire on its own. It would sputter, fart, fire and did it endlessly. Finally it started to clean out and once the engine heated up it pretty much ran itself clean. This is a big effort and teaches you to trust your source.
nuhawk is offline  
Old 07-04-2007, 09:41 PM
  #4  
Junior Member
Squid
 
Join Date: Aug 2006
Location: monrovia ca.
Posts: 19
ietgixxers is on a distinguished road
if i fill my tank all the way to the top it will run like that,i will open fuel cap close it and it will run fine
ietgixxers is offline  
Old 07-04-2007, 09:57 PM
  #5  
Sprung
World Champion
 
Hawkrider's Avatar
 
Join Date: Dec 2004
Location: Fulton, MO
Posts: 105,285
Hawkrider will become famous soon enoughHawkrider will become famous soon enough
I'm thinking water in the gas. There's a good possiblity that the overflow line on your tank is clogged between the tank and the end of the line at the bottom of the bike. Reason I say that is because this all started after you washed the bike. If there is water in the space above the filler cap seal and the tank then as soon as you unlock the cap the water will go in the tank. There is a hole right where you fill the tank that is the overflow drain. Blow that passage out with compressed air (from the top down). See if anything strange comes out.

Assuming it is water in the tank, a bottle or two of Heet (or similar fuel water remover) and a few tanks of gas will alleviate the problem.
Hawkrider is offline  
Old 07-04-2007, 09:59 PM
  #6  
Sprung
World Champion
 
Hawkrider's Avatar
 
Join Date: Dec 2004
Location: Fulton, MO
Posts: 105,285
Hawkrider will become famous soon enoughHawkrider will become famous soon enough
Originally Posted by ietgixxers View Post
if i fill my tank all the way to the top it will run like that,i will open fuel cap close it and it will run fine
That's vacuum lock because you got fuel in your tank vent, and is entirely normal for this bike.
Hawkrider is offline  
Old 07-05-2007, 02:22 PM
  #7  
Junior Member
Squid
Thread Starter
 
Join Date: Jul 2007
Posts: 5
SLOHawk83 is on a distinguished road
Thanks and more thanks

Well shes back up and running. The culprit was bad gas not vapor lock(I had checked that in the beginning just forgot to say), but water had somehow gotten into my tank, I think it could have been the overflow drain im not sure though. But i know now that you cannot get all the gas, or water out of your tank by simply syphening. The water stays on the bottom. This time i physically emptied the whole tank of gas, blew out the overflow drain from the tank down and nothing unusual came out an then drained and sprayed out the carbs. I also added some HEET to my new tank of chevron 91. It took a little coaxing to get the fuel to work its way in but it did and it seems to run beautifully now. Thanks for all the advise. I just added a pic of my hawk in the members gallery. Beautiful day iv got to go for a ride now
SLOHawk83 is offline  
Old 07-05-2007, 03:09 PM
  #8  
Senior Member
MotoGP
 
nuhawk's Avatar
 
Join Date: Sep 2006
Location: Austin, Tx
Posts: 4,138
nuhawk is on a distinguished road
nuhawk is offline  
Old 07-05-2007, 06:54 PM
  #9  
Senior Member
SuperBike
 
RickB's Avatar
 
Join Date: Sep 2005
Location: Buffalo, NY
Posts: 1,572
RickB is on a distinguished road
glad it was fairly simple...
RickB is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
ScottinLa
Technical Discussion
8
10-06-2013 04:58 PM
mcadena89
Technical Discussion
16
06-03-2009 12:04 AM
mattvdsande
General Discussion
8
03-16-2009 11:12 AM
Chitownson
Group Rides
17
01-11-2008 04:31 PM
Surflop
General Discussion
2
03-05-2007 07:03 PM


Thread Tools
Search this Thread
Quick Reply: Help Please, my hawks down


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.