petcock
in [Tech]
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From: cliffsarrel on 9 Jul 2008 15:38 On Jul 8, 8:08 am, "Who Me?" <hitchhi...(a)dont.panic> wrote: > <cliffsar...(a)hotmail.com> wrote > > > the importance of a properly functioning petcock on an older bike is > > monstrous. > > most old ones leak when off-just enough to build up gasoline in your > > OIL-BEWARE.... > > question-should i rebuild mine or get a new one for a 1981 xj750 seca > > if new-where???? > > And another self-proclaimed expert.....who really knows nothing....rides > into town !! > > Without a corresponding leaking needle valve or mal-adjusted float in the > carb., a leaking petcock results in...........NOTHING. Certainly not gas in > the oil.....unless the overflow in the carb is also blocked closed. > > You need to address your carb. problems first. > > There may not even BE a problem with the shut-off. If you ARE getting gas > in the oil, it might be getting there while the engine is running. rick as you know by now i hhave an 81 xj750 seca,does this bike have the GERMAN GS-32 carbs or what?dealer keeps giving me makuni? parts like main jets that are too small dia. for the threded whole- confused dummy????
From: . on 9 Jul 2008 15:45 On Jul 9, 12:38�pm, cliffsar...(a)hotmail.com wrote: > rick as you know by now i hhave an 81 xj750 seca,does this bike have > the GERMAN GS-32 carbs or what?dealer keeps giving me makuni? parts > like main jets that are too small dia. for the threded whole- confused > dummy????- Hide quoted text - You probably have Hitachi carbs.
From: Rick Cortese on 9 Jul 2008 17:03 Dave Emerson wrote: > "Rick Cortese" <ricortes(a)earthlink.net> wrote in message > news:96idndqbcKnkI-7VnZ2dnUVZ_q7inZ2d(a)earthlink.com... > >>The 2smokes' carb bowls fill up with oil so I can kid myself that it >>supplies extra lubrication when they start after a long time idle.<sic> > > > pre-mix? > > Right. Since carburetor is vented to atmosphere the volitiles just cook out the overflow tube and leave high boilers and solids. Happens to me regardless of petcock but a leaky petcock certainly makes the situation worse. Gets so hot and I some bikes I ride less then once a year. I should get off my duff and just drain tanks and seal up the bikes in plastic sheets or something but I keep thinking "Next week I will start riding every weekend." 91F in the shade as I write this. Rick
From: Rick Cortese on 9 Jul 2008 17:24
cliffsarrel(a)hotmail.com wrote: > On Jul 8, 8:08 am, "Who Me?" <hitchhi...(a)dont.panic> wrote: > >><cliffsar...(a)hotmail.com> wrote >> >> >>>the importance of a properly functioning petcock on an older bike is >>>monstrous. >>>most old ones leak when off-just enough to build up gasoline in your >>>OIL-BEWARE.... >>>question-should i rebuild mine or get a new one for a 1981 xj750 seca >>>if new-where???? >> >>And another self-proclaimed expert.....who really knows nothing....rides >>into town !! >> >>Without a corresponding leaking needle valve or mal-adjusted float in the >>carb., a leaking petcock results in...........NOTHING. Certainly not gas in >>the oil.....unless the overflow in the carb is also blocked closed. >> >>You need to address your carb. problems first. >> >>There may not even BE a problem with the shut-off. If you ARE getting gas >>in the oil, it might be getting there while the engine is running. > > > rick as you know by now i hhave an 81 xj750 seca,does this bike have > the GERMAN GS-32 carbs or what?dealer keeps giving me makuni? parts > like main jets that are too small dia. for the threded whole- confused > dummy???? Just my op, but I would go to http://sudco.com/ if you are having trouble with the dealership. These guys really know vintage<and modern> carburetion. There's also www.denniskirk.com that has an online catalog with parts, cross ref/applications. More op, but what do your plugs look like? It could be you only have one problem carburetor and the rest are ok. I would just concentrate on getting the carb associated with a fouled or black sooty plug fixed and leave the others alone. You may have more then one problem, like overflow and vent tubes clogged to go with floats not working properly. I don't think they had charcol canistors in the early 80s on bikes... If your overflow is working right, you should be seeing a puddle of gas under the bike. Rick |