Wilsons Sandbox

--- In DSN_KLR650@yahoogroups.com, Rick Brown wrote: > > If you've been following this post, here's the last information I received from Fred. I posted it off-line by accident so here's the items I did that fixed my surging and backfiring proiblem. Hopefully online this time so the whole group get to see the fix. > > 1.) Re-cleaned the airfilter > 2.) Dis-assembled and cleaned the gas tank lid > 3.) Removed the petcock and replaced the petcock diaphgram > 4.) Replaced the vacuum line (more on this) > 5.) removed and checked the fuel line > > After all of this I took the bike back out on the interstate and although it went twice as far as before, the problem came back. > > This time I pulled the bike over and gave it a good looke-see. I'm glad I did because what I noticed was that when the bike gets hot the vacuum line kinks at the bends (it's the clear flexible type). To fix this I replaced the new vacuum line that was the same length as the old one, w/ another one only I made this one about 1 1/2" longer to increase the size of the bend radii. > > The bike runs great! > > I hope this helps somebody else if they've run into something similar > > Thanks for the help Fred > > > > Did you mean for this message to be sent to just > me or the whole list? > > Your petcock has a vacuum operated shut off valve > and will only flow fuel when the engine is running or cranking over. The > vacuum opens the shut off valve so that fuel can flow through this valve. > If your engine is off, the fuel will not flow through on the on or reserve > position. > > The "hissing" you are hearing is the gas cap vent letting air > into the tank. Gas won't flow out of the tank unless air is let back in. > The gas cap vent has been known to get dirty and restricts the air moving back > into the tank. This is the noise that you are hearing. I'd check your gas > cap vent to see that is is venting properly. Be careful since there are > some small springs and balls in the cap that can be easily lost. > > Good > luck and let the list know what you have found out. > > Fred > http://www.arrowheadmotorsports.com > > -----Original > Message----- From: Rick B > Sent: Saturday, July 16, 2011 7:52 PM > To: DSN_KLR650-owner@yahoogroups.com > Subject: > Re: Surging and backfire - Update > > I got a chance to work on the bike > today and here are the results; > > Test drive; > > The bike ran fine down > I25 @65-70 mph for the 1st ten miles, twice as far as it did yesterday, so I > figured I had the problem corrected. > However when I got off at the next exit > and started back at about 75-80mph it started the surging problem again, but > less than before. By the time I got close to home I noticed that it > wouldn't idle anymore at stop lights. It seems to be running hotter than it used > to, as in the temp gauge was reading 5/8-3/4 rather than at 1/2 and the gas tank > was emitting a steady hisssss. When I disconnected the fuel line from the > carb and turned the petcock to open/reserve it wouldn't drain, is that > normal? > > The work; > > Drained the tank, removed/cleaned/inspected the > petcock and replaced the diphgram and put in new fuel > > Removed/blew-out w/ > a compressor/inspected the fuel line and vacuum line > > Removed the tank > vent line on the back of the tank and lifted the tank lid and blew it out. > replaced the line > > Removed/re-cleaned the air filter > > I bought a can > of seafoam on the way home and will add it tomorrow. > > Thanks for all the > help so far, Do you have any other > suggestions? > > [Non-text portions of this message have been removed] > [Non-text portions of this message have been removed]