probs with converting to twin carbs...
>first off the two bottom nuts which hold the carb onto the heatshield
>(and manifold) - any ideas on how to tighten these past finger tight?
>as my spanners are too big... will i just have to hunt down like some
>(no pun intended) mini spanners or is there like a specific shaped
>spanner which fits past the pancakes?
You can't take the pancakes off, tighten the nut and refit the pancakes ?
>also, when disconnecting the hoses and pipes from my single hs4, i
>disconnected the fuel line from the float chamber, the vacuum advance,
>both of which ive reconnected onto the twin hs2s, but i also
>disconnected one large pipe off of a port coming off the carb at an
>angle, one off the manifold (which has got "fuel" written on it, and
>appears to come from the brakes :\ ) and another mystery one off the
>float chamber...
I think, though not certain, that the 1990 had a waste bottle fitted under the wing to meet emmissions testing. Does one of the pipes you disconnected go off under the wing ? Otherwise, it is possibly the fuel overflow waste pipe. The pipe for the brakes is the vacuum assist pipe. Without this being connected your brakes will not operate correctly, and you will feel they are unresponsive. I've never fitted twin carbs' but I believe you can drill a hole into one of the manifold pipes and tap a fitting into it so that you can reconnect the vac hose. It may be that there is also an adaptor available which fits between the carb and the manifold and provides a suitable vacuum take-off point for the brakes. Perhaps a phnecall to Minispares will give the answer.
>only problem is that after the float chamber fuel line and the vacuum
>advance cable have been reattached, i only have 2 ports on the hs2s for
>3 pipes... worst of all, both these ports are in identical positions on
>either carb (1 on each) both coming off at an angle from each carbs
>body :\
The pipe coming off at an angle is normally the connection point for the crankcase breather hose, which comes around from the back right hand side of the engine, attahced to a metal can welded to an engine cover plate. You can buy y-pieces which will allow you to split your single breather into two and attach one to each carb, to balance the job of burning engine vapours between all cylinders, or maybe you can get away with connecting the breather hose to only one carb , but in this case you should block off the remaining angled pipe on the other carb.
>im thinking that maybe the one which plugged into the manifold just
>carried water and was part of a 'water heated inlet manifold'? and that
>i can just plug this hose? only concern is that it does say fuel on the
>hose :\
Somebody may well have replaced the original rigid black tubing which normally feeds the brake vacuum servo unit with a suitable piece of another type of hose. If the part which connects to the brake device seems to have only a push in grommet type of fitting this pipe is almost certainly the vacuum servo hose and will need to be attached to a vacuum source at the inlet manifold.
Chris
Posted: Jul 27, 2006 09:13 AM