Hitchcocks Forum

After having fitted the S&B filter and shroud, I thought the carby looked a bit unsafe simply dangling on the rubber hose between the cylinder and itself. It jumps about when I drive on rough roads and the top of the carby was knocking on something, probably the frame or the underside of the tank. I could hear it when I rocked the carburettor by hand.

Having once done a bit of fabrication, I decided to make some sort of supporting bracket for the filter side.
I got some thin aluminium strip from the local hardware store and got to work with vice and pillar drill. Here's the
result..





The top end fits under the tank retaining bolt and the tang at the bottom fits under the jubilee and over the rubber end of the S&B.

The carby is set solid now with support at both sides..


Sometimes, I amaze myself..!!

Next steps to take are remove that PAV system and fit a fibreglass coil cover. Didn't go for the Amal rubber connector then? It would have saved you making the bracket.

Thanks Midge, for making my day..!!


Amal connector? Didn't even know about it.. so, no.


I have thought about the coil cover thing but I've just found a sheet metal fabricator/panel beater, not too far away, who could possibly bang out something spectacular in mild steel plate.



What's involved in getting rid of the PAV? Probably something fiendish to do and very expensive, if I know my luck.

Hi Exile, it is not fiendish or expensive. You just remove it all and buy a cheap blanking plug from Hitchcocks to fill the hole in the exhaust (or buy one of their new exhausts without the hole anyway.) And also seal the hole to the carb; I used a self tapper, making very sure no bits fell inside. I have done it to both my bikes, years ago, no problems at all. Any other thoughts, anyone? ATB, Chris

Just to add, the PAV is just there as a sop to the emissions regulations. It doesn't do much and is just something to go wrong.
By the way, don't expect any improvement in performance with the filter unless you change the silencer and downpipe for a free flow system. The originals are very restrictive.

Consider my PAV on the strike list. I always wondered why it was there. Thanks Chris.


@ Pete F:
My original intention was simply to free up a toolbox. Then it all got complicated with re-jetting and such. I did all that without too much trouble and a load of advice from the guys on here.

Having said that thought, I road tested the bike after all the work on the carb and I did feel a marked improvement in acceleration and a slightly higher top speed. I consider that a bonus, considering that I was only after a bit more storage space!

All in all, I'm chuffed with what I've achieved. Never too old to learn.

HI EXILE------------ you might just want to complement that bit of extra power by fitting a 19t output sprocket ?--------- It'll keep the top-end revs down a bit when cruising at approx. 60 mph....Both mine have that and all those other "trimmings" you mentioned...BUT (there's always one of those, eh ??)--it WON'T get rid f the 3rd-4th speed G-------------- A ---------------P !! Mores the pity !!

Just to clarify, it's not the actual carb it goes into, I may have written that a bit wrong; anyway you'll see it when you remove it! Look at your photo, near the engine. I suppose if you had a bit of arsenic in the bottom of a beer glass you'd not drink it. But if you filled it up with water it would register as a weaker solution. But you still wouldn't drink it, even though it registered as less strong. So perhaps having the PAV attached just make it SEEM better. Someone also wrote we should keep them, once off, just in case future laws make it legal to mask the amount coming out.
Mine's in the shed, just in case. Hope not, as it does make it easier to get at other bits of the bikes without it. Also>>>>>>(ALAN) What's it like with the new sprocket, going uphill, just in case I might want to do mine? -Chris

yesyes thats the way to do it it will save the carb falling off if you have a blow back did i mention paul diesel,s motorcycle forum on facebook the membership is coming in from all around the world and we have some great photo,s being posted atb paul.

I know what you mean Chris.. the PAV outlet is from the intake port on the cylinder, not the carb.

I will get round to removing the damn thing at some point in time.


@ AlanR:

Don't really know how I feel about changing the sprocket.. Small baby steps for now..!!