Carb talk

[Reggie3cl]

Yeah, it's a bloody nuisance.  I stretched the ends of the rubbers (oooer!) which has helped, but something isn't quite right in between the carbs and airbox.

Ideally I'd lift the airbox a little to line things up a bit better, but that isn't possible as it hits the frame rails.  The engine to carb rubbers might be a bit long, but I can't see that it is possible to alter these really without messing up the groove where the jubilee clip sits.

I do have some little aluminium cup things which are belmouth shaped.  The open (wide) end has a rolled edge and fits perfectly in the end of the carb rubber which then seals the rubber to the airbox very well.  If I could cut these down to about 15mm long they would go in nicely and wouldn't restrict flow, but probably without some goop to hold them in they'd fall out...  Then if I used goop (what sort?) would I be able to get the aluminium bits out when I needed to?


AAARGH!

On the other hand, the forecast is pretty good for the west of Scotland, so I'm more worried about a lean running donk than water ingress... 

 

[Rob]

Hey Reggie - when my RGS was running Dells with (non standard) alloy inlet manifolds and associated longer (Guzzi?) rubbers a la 120 Jota, the airbox rubbers didn't fit.  IPO (innovative previous owner) resolved the issue by poking more of the airbox rubber into the airbox, past the normal sealing groove.  Sounds odd but actually worked and looked OK.  The OD of the airbox rubbers (the flat bit between the corrugations) seemed to fill the airbox hole OK.  From the sound of things, yours don't?

 

[sfcpiet]

Ideally I'd lift the airbox a little to line things up a bit better, but that isn't possible as it hits the frame rails.  The engine to carb rubbers might be a bit long, but I can't see that it is possible to alter these really without messing up the groove where the jubilee clip sits.

Reggie,

Do not despair, I'll show you Saturday...

piet

 

[Reggie3cl]

Talked to 'sweary' Richard Slater today about this (he supplied the carb to airbox rubbers which I have been having the problem with) and as Rob says, the Guzzi rubbers are not how the bike should be set up, causing a mismatch.  I've since discovered that putting the the Jubilee clip so that the bit containing the screw bears on the head of the inlet stub bolt forces the rubber down a wee bit, which should help.

Apparently someone is manufacturing the correct metal/rubber inlet stubs again (Slaters had only two in stock at fifty quid each) so there is help out there for the similarly afflicted...

Piet, bring your gun and put the bugger out of its misery, I have a perfectly serviceable BMW to use (with heated grips).

 

[sfcpiet]

Reggie,

I've found connecting rubbers that are almost a perfect replacement for the original Jota type, just need minor tweaking.  In conjunction with the late Jota stubs, the air box hoses are again a perfect fit.

Needed to fit a set to the RGS after I found that one of the originals had finally parted company with the flange... no further issues whatsoever.

piet

 

[Reggie3cl]

Sounds interesting, although I have pretty short stubs on my bike- the ones on my 180 were longer IIRC.  I got the impression from Sweary that there were two lengths out there.  Anyway, should get it all back together today, fingaz crossed.

 

[Reggie3cl]

Gotta love a bit of gentle outdoor spannering.  Unbroken sunshine again today so out in the garden and the old heap is back in one piece and ready to rock and roll this weekend.

New inlet rubbers and repositioning the worm drive of the clips did help the position of the carbs a bit, and a bit of self amalgamating tape on a split in the long intake rubber sorted out that probable leak at least temporarily.

But I did as Rob suggested (and indeed what I had done using standard rubbers with my Mikunis) and poked the rubbers more into the airbox than they should be to get a decent fit without really squashing things up.  Sorted.