Posted by ` on March 19, 2010, 8:46 am
> Friend's CB750 is long gone, air cutoff on all four makes sense, just
> trying to remember why the accelerator pump (which I think was what was
> pictured) was only on one carb.
One pump is plenty to meet the requirement for extra fuel during low
vacuum conditions.
If you study the carburetor drawings, you'll see that there are rubber
tubes connecting all four carbs together. The accelerator pump output
goes to those tubes so all four carbs get a squirt of fuel when the
throttle is opened but engine vacuum is too low to suck fuel through
the idle ports and the needle jet.
Posted by TOG@Toil on March 17, 2010, 12:27 pm
> On Mar 17, 2:10 am, totallydeadmail...@yahoo.co.uk (The Older
> Gentleman) wrote:
> > > checked it out and gas is leaking from all four drain tubes. i turned
> > > the drain screws all the way around the opposite direction, but that
> > > didnt change anything. ill take the carb off and try to post some pics
> > > tonight.
> > I think the simplest solution is probably the most accurate. You haven't
> > tightened up the drain screws properly.
> > Krusty's right when he says O-rings deteriorate with age, but for all
> > four to go at the same time? Nah.
> > --
> > BMW K1100LT Ducati 750SS Honda CB400F Triumph Street Triple
> > Suzuki TS250ER GN250 Damn, back to six bikes!
> > Try Googling before asking a damn silly question.
> > chateau dot murray at idnet dot com
> ok yes to clarify there are four carbs. i suppose i should have called
> 'it' the carburetor assembly? im new to this... anyways i definitely
> didnt take them apart, only removed because my choke cable got loose
> and was sort of dangling and the bike wouldnt start. being so new to
> this, im a little wary about popping open my float bowls and fiddling
> around. All my o rings should be new because (allthough its an 81) the
> engine was recently rebuilt. The 'carburetor assembly' is very clean
> and looks brand new. The guy i bought it from said essentially the
> whole bike was new accept for the frame, the tank, and the instrument
> cluster. might have been bs but nothing on it LOOKS thirty years old.
> ok so is the new consensus that the drain screws all came out some
> during the carb assembly removal and just need to be tightened? that
> seems about as likely as something getting inside all of them and
> blocking the needles... ill get out a digital camera and get some pics
> on here.
> p.s. i feel silly for thinking the drain screws were like an on/off
> switch. i've been looking at carburetor assembly diagrams for days now
> and they are clearly screws... sigh, chalk it up to inexperience! haha
Can't get the photos to load for some reason, but the most likely
explanation is still that someone - not you, then - didn't tighten up
the screws before refitting the carbs. Just tighten them up. Caution -
nip them up carefully, because it's quite easy to strip the threads in
the float bowls.
Oh, and whichever forgetful sod forgot to tighten them up probably
forgot to tighten the choke cable assembly too. I wonder what else he
forgot?
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> trying to remember why the accelerator pump (which I think was what was
> pictured) was only on one carb.