My original "O" ring measures at 2.6mm X 45.5mm and the manifold OD for the O ring is 49mm at the out side. Subtract the 2.6mm thickness of the O ring and your there. The parts manual has some issues, like the part numbers for the rear brake cylinders and a number of the bolt lengths to name a few.
Bill
> -----Original Message-----
> From:
> 2cylinderhondas@yahoogroups.com [mailto:2cylinderhondas@yahoogroups.com] > On > Behalf Of > feltonminicycle > Sent:
> Saturday, May 29, 2010 8:26
> AM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> [2cylinderhondas] Re: Manifold Gasket?
> Honda still has these o rings in stock under a later model part number. I > order them all the time. Will dig up the number later today.
> The exact
> dimension is in the coupe parts book: 2.4mm x 42mm
> Miles
> --- In
> 2cylinderhondas@yahoogroups.com
> ,
> bottom cop wrote:
> > Surely by now, someone
> has an EXACT size of this o-ring.
> > --- On Sat, 5/29/10,
> billmyong@... wrote:
> > From:
> billmyong@...
> > Subject: RE: [2cylinderhondas]
> Manifold Gasket?
> > To: happy-accidents@..., krsievert@...
> > Cc:
> "Anzhonda600owners" anzhonda600owners@yahoogroups.com
> >,
> 2cylinderhondas@yahoogroups.com
> Date: Saturday, May 29, 2010, 4:22 AM
> >
> > Ken, � Linda
> and other restorers of the Honda 600;
> > �
> � � � Caution, the "O" ring is thinner tan the casual "O" ring > supplied at the local hard ware store.� > > 1 - It is thinner, to > use one that is to thick� will crack the base of the intake manifold when > you tighten it down.� Or two thin and it does not seal.
> > 2 - It
> must� be resilient to fuels, Viton is best but Nitrile or > Buna-N� will work just as well.� Neoprene, Butyl or Natural Rubber > will all fail.� � Which� can cause a fuel leak and besides > catching on fire, there is short term fuel mileage loss and erratic carburetor > function.� � > > 3 -� � The person I was getting them > from has retired so I have no idea of availability.� � Also, the > invoice noted special shipping and that was back in > 2005.� � > > � > > If you can't find them, let me > know and I will get in touch with them on Tuesday.
> > �
> Bill
> > �
> > �
> > �
> -----Original Message-----
> > From:
> 2cylinderhondas@yahoogroups.com
> [mailto:
> 2cylinderhondas@yahoogroups.com
> ]On
> Behalf Of Kenneth Sievert
> > Sent: Thursday, May 27, 2010 3:10 PM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject: Re: [2cylinderhondas] Manifold Gasket?
> > �
> > I believe the manifold
> "gasket" is just an o-ring. I'm not sure about the size, so take the old one > with. Most any hardware store should have one.
> > --- On Thu,
> 5/27/10, Linda Classon wrote:
> > From: Linda Classon snet.net>
> > Subject: [2cylinderhondas] Manifold Gasket?
> > To:
> 2cylinderhondas@ yahoogroups. com
> > Date: Thursday, May 27, 2010, 2:53
> PM
> > �
> > Took my 71 Sedan to my
> local Honda dealer for a tune-up because it was
> > running rough. The
> diagnosis is that it has a bad manifold gasket and
> > there's gunk in
> the carburetor.
> > Does anyone have or know where to get the
> manifold gasket? I don't
> > care that it's authentic, just something
> that works. Also, does anyone
> > do carburetor re-builds?
> > Thanks!
> > Linda in CT