New carbs 750s 1969

E

Edwardtechnical

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Hi I am working on my brothers 69 750s and the old slide carbs are toast would appreciate any info about what new Dellorto carbs would fit I have 30 mm clearance from top of old carbs to bottom of frame
Thanks
 
You certain that those carbs are dead? Those square slides are very hard wearing.
Otherwise, round slide 30mm Dell'Orto would fit I imagine or as Bob writes, stick Mikunis on it.

There are however piles of secondhand VHBs available. They were fitted to just about everything Italian in the 60s.

Paul
 
The VHBs had loads more slide slop that would be thought acceptable when they were new. In service, the sloppy slides are rarely of any concern. I'd consider them toast only if the lugs for jets and passages have been seriously attacked by corrosion, causing leaks or incorrect calibration. More important is that brassware is in good condition and settings are correct.

Lovely, simple instruments, not much to go wrong on them.

piet
 
if you change from square slide VHB carbs to round slide PHF carbs, in practise all the hardware is available for them to bolt on to the engine, but beware! I have seen a bitsa bike here in UK, which would seem to have had VHB's origianlly and is now fitted with PHF's, and there is a serous clash with the frame of air filter box and/or bell mouth stacks, since this bike has neither, remember there are about four major frame changes for the Breganze twins and about another six minor ones, meaning that there are (something like) eight differring part numbers for the various frames, and yes I know the maths doesnt add up, in this case what changes, is the four top tubes, most of which are literally that with four tubes bent up and welded to the headstock, others have six tubes and consequently a different profile, noticable at the headstock.
CLEM
 
CLEMTOG said:
if you change from square slide VHB carbs to round slide PHF carbs, in practise all the hardware is available for them to bolt on to the engine, but beware! I have seen a bitsa bike here in UK, which would seem to have had VHB's origianlly and is now fitted with PHF's, and there is a serous clash with the frame of air filter box and/or bell mouth stacks, since this bike has neither, remember there are about four major frame changes for the Breganze twins and about another six minor ones, meaning that there are (something like) eight differring part numbers for the various frames, and yes I know the maths doesnt add up, in this case what changes, is the four top tubes, most of which are literally that with four tubes bent up and welded to the headstock, others have six tubes and consequently a different profile, noticable at the headstock.
CLEM
Click to expand...
Would need checking of course Clem.

Paul
 
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