BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: Dibble on 26 Sep, 2023, 09:24

Title: Leaking monobloc woes
Post by: Dibble on 26 Sep, 2023, 09:24
Hi gents
Approaching the moment of truth with the hornet resto and guess what t looks like the carbs ( or at least one ) is shot!   Try as i might the 689 will not seal. Has anyone come across the bodys becoming  porous over time? There is evidence of corrosion probably salt? So either new carbs or at least a serviceable used 689. Any recommendations as to where to source new and any thoughts on what model to buy? Monos for originality ofcourse but open to suggestions. Thanks all.
Dave.
..
Title: Re: Leaking monobloc woes
Post by: ducati2242 on 26 Sep, 2023, 20:35
buy all my carbs from surry cycles . https://surreycycles.com/ . or. https://amalcarb.co.uk/ .
Title: Re: Leaking monobloc woes
Post by: cdsdorset on 26 Sep, 2023, 22:23
Where does the leak appear to come from?
Title: Re: Leaking monobloc woes
Post by: Dibble on 27 Sep, 2023, 08:05
The leak is most definitely around the float bowl. I've tried checking mating surfaces on a flat plate new covers and gaskets. Im sure its seeping through in the vicinity of some corrosion damage and gathering at the lowest point! Looks like new carbs. Thanks for your input.
Dave