Hi All - i am just about to refit my carb to my Fleetstar and I am a little puzzled by the mounting arrangement. The carb page of the parts manual shows an O-ring fitted in the carb mating flange groove; the cylinder head page shows two gaskets fitted to the intake manifold; a paper one next to the head itself and a Tufnol one between that and the carb. My question is really that this seems like an awful lot of sealing, overkill maybe? I recall on my Triumph twin the O ring is designed to be compressed leaving the carb with a little wiggle room and there is no gasket as such... then again its a thicker O ring. I just wondered if all of these are really needed or if they are alternatives? All were fitted when I took the thing apart and so I will refit them as found but it still seems a bit excessive. Cheers Mike
Go with the Trimumph method or the smaller O ring and tufnol spacer etc as you need a good seal plus both give a thermal barrier stopping the engine from heating the carb and the fuel for easier hot starting. I use nyloc nuts so you are not tempted not over tighten and warp the carb flange to try and stop them coming undone.
Last edited by kommando; 02/01/168:58 am. Reason: Clarified O ring
yep so you reckon one or the other? That was my feeling too. I think compressing an O ring between a hard ally surface (the carb flange) and a deformable surface (tufnol spacer) is probably ineffective anyway.
To explain better, you need the thinner O ring with the Tufnol spacer and gasket or the thicker Triumph O ring and no spacer. Any air leaks at this joint will mess up your carb settings and the bike will not run properly.