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03-09-2010, 1:25 AM Dan Joined on 08-13-2009 Yukon, Canada Posts 17 Can't rev past 5000 on the stand Hello, I've been trying to fix up my first road bike, gl500I and it's been a learning process. Right now I pulled the carbs because I thought I may have reversed the jets when cleaning/putting back together. Not the case. I thought my problem may have been a fuel problem because the engine seemed to lose power like I had hit the kill switch until it fell under/about 3000 RPM and then sputter back to life. It mocks me, any thoughts? 1981 Gl500 I (first bike)    Report

03-09-2010, 3:33 AM Shep Joined on 01-30-2007 UK.2x1980CX500A Posts 7,638 Re: Can't rev past 5000 on the stand I'd suspect the carb floats are out, Click here, http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=19&t=110 and once the carbs have been correctly serviced, http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=19&t=140 Balance them at the engine idling speed. HTH :) My Music http://www.reverbnation.com/pauldouglas/ Join Just In Case :) http://globalcxglvtwins.hostingdelivered.com/ Id quot circumiret, circumveniat    Report

03-09-2010, 11:52 AM Dan Joined on 08-13-2009 Yukon, Canada Posts 17 Re: Can't rev past 5000 on the stand Measured the floats, ~ 14 mm for both carbs so I replaced both FNV. Runs fine, now my water pump cover leaks. :(  1981 Gl500 I (first bike)    Report

03-09-2010, 3:21 PM Shep Joined on 01-30-2007 UK.2x1980CX500A Posts 7,638 Re: Can't rev past 5000 on the stand  Dan wrote: Measured the floats, ~ 14 mm for both carbs so I replaced both FNV. Runs fine, now my water pump cover leaks. :(  It's only a rubber seal.If it's not damaged you can seal it with silicone gasket sealer.Get the carbs out of the way and remove all the bolts and carefully prise it off and you should be able to see. My Music http://www.reverbnation.com/pauldouglas/ Join Just In Case :) http://globalcxglvtwins.hostingdelivered.com/ Id quot circumiret, circumveniat    Report

03-09-2010, 5:41 PM Dan Joined on 08-13-2009 Yukon, Canada Posts 17 Re: Can't rev past 5000 on the stand Had it off, thought the seal might just be dirty. So I wiped it all down and cleaned up all the mating surfaces, threw it back on: leaks worse. Gasket was looking a little squarish and chewed up in places. I bought some gasket maker, Permatex Ultra Blue,  and I guess that's the next step. I just spent the last three hours trying to re-drill an easy-out out of my Brake MC assembly (it wasn't easy) because the brake reservoir screws were both snapped off flush with the aluminum. Those are now fixed, bigger and happy. Relating to my water pump cover, when I had it off, I noticed that my impeller is all rusted up. Is this a problem? I had the bike warmed up and the temp never went past the first increment, floating just below or before the "E" in "TEMP". Should I be changing out the mech seal while I have it open? I've never done that, I'd need to order some in. If yes,     Edit* I just read up on shep's method, will the innards of the Yamaha 11H-12438-10-00 mech seal fit in my GL500I? End Edit* Thanks, Dan 1981 Gl500 I (first bike)    Report

03-09-2010, 7:05 PM Dan Joined on 08-13-2009 Yukon, Canada Posts 17 Re: Can't rev past 5000 on the stand Oh, That's what a weep hole does.... I just got smarter, don't answer my "do I need to replace the seal" question... it should have been obvious. I didn't realize that that was my problem in the first place. I'm still wondering if I'm safe to order those Yamaha seals though, they'll work in a 81 GL500I correctly? Thanks, 1981 Gl500 I (first bike)    Report

03-09-2010, 7:15 PM astroguy Joined on 09-24-2009 Kingston Ontario Canada Posts 141 Re: Can't rev past 5000 on the stand Man, I've read so much about this mechanical seal that it's as if I can hardly wait for mine to die. Good luck, Shep makes it sound easy and probably is. Dave 1982 GL500I presently. Bikes I've owned.... 1971 Honda CB350 1981 Yamaha 650 Maxim 1982 Yamaha 550 Seca 1982 Yamaha 650 Seca 1981 Honda CX 500 1989 Suzuki 650 Savage. "I'm stuck in the '80s" apparently.    Report

03-09-2010, 10:52 PM spanish bandit Joined on 02-12-2009 southern spain Posts 4,999 Re: Can't rev past 5000 on the stand  Dan wrote: Oh, That's what a weep hole does.... I just got smarter, don't answer my "do I need to replace the seal" question... it should have been obvious. I didn't realize that that was my problem in the first place. I'm still wondering if I'm safe to order those Yamaha seals though, they'll work in a 81 GL500I correctly? Thanks, correct.when you order it,buy two,incase you mess one up.remember the adhesive in the yammy seal takes more heat to release.be pacient when i feel the need,i do it,llego,ve 60,s ----------------------------- 2008.1982 honda gli silverwing [uk model ] 2010.1981 honda gli silverwing [uk model ]    Report

03-10-2010, 3:33 PM Shep Joined on 01-30-2007 UK.2x1980CX500A Posts 7,638 Re: Can't rev past 5000 on the stand  Dan wrote: Had it off, thought the seal might just be dirty. So I wiped it all down and cleaned up all the mating surfaces, threw it back on: leaks worse. Gasket was looking a little squarish and chewed up in places. I bought some gasket maker, Permatex Ultra Blue,  and I guess that's the next step. I just spent the last three hours trying to re-drill an easy-out out of my Brake MC assembly (it wasn't easy) because the brake reservoir screws were both snapped off flush with the aluminum. Those are now fixed, bigger and happy. Relating to my water pump cover, when I had it off, I noticed that my impeller is all rusted up. Is this a problem? I had the bike warmed up and the temp never went past the first increment, floating just below or before the "E" in "TEMP". Should I be changing out the mech seal while I have it open? I've never done that, I'd need to order some in. If yes,     Edit* I just read up on shep's method, will the innards of the Yamaha 11H-12438-10-00 mech seal fit in my GL500I? End Edit* Thanks, Dan No harm in it being rusty but I'd give it a wire brush and I treat mine with  some rust eater/converter type stuff, And I use a bit of thread lock on the 10mm domed nut.As for the seal unless you source a new one take it off and boil it in a pan of water(don't let the pan boil dry).The synthetic rubber has memory and boiling it can put some of the elasticity back into it.Then put a liberal amount of silicone sealer into the cover groove but let it go off for a good half hour in a warm room.Then place the seal onto that.It will raise the profile of the seal and help seal the cover.Apply some to the top as well as you fit. My Music http://www.reverbnation.com/pauldouglas/ Join Just In Case :) http://globalcxglvtwins.hostingdelivered.com/ Id quot circumiret, circumveniat    Report

Honda CX500 & G... » CX500 GL500 Tra... » Technical Help ... » Can't rev past 5000 on the stand

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