Dellorto floats

[Garry]

The RGS drives me crazy sometimes...
I have/had the problem that after driving for about five minutes, it would run on two cylinders and sometimes on just one. Because I’ve completely restored it and replaced or modified all sorts of things, I didn’t know where to start looking...
Eventually I got round to the Dellortos, where I replaced all the brass parts (jets etc.) and the throttle needels, as well as the floats.
The black 10g ones were no longer available and were replaced with the equivalent type 7450-01 in white.
When fitting them, I didn’t compare them with the old ones, only to discover that these are actually the right ones.
I swapped the floats back to the old black ones, and only then did I notice the differences.
Looking at the photos, does she get too much fuel with those white ones?
Which might explain why she then runs on just 2 or 1 cylinder?
After a short test drive, she does indeed run better and the exhaust headers are turning more brownish-blue.
A longer, more thorough test drive will show whether this was indeed the problem.

Does anyone have any experience with these white floats?

 

[Paul Marx]

If you set the fuel level in the float bowls, what matters the colour of the float.
The weight can come into play in some situations.
But why the hell did you change perfectly good floats in the first place?
If it ain't holed, it floats.
Paul

 

[Garry]

I replaced the floats because they’d already been adjusted a few times in the past…
and because I thought: while I’m at it, I might as well replace the rest as well….

 

[TeddyG]

As mentioned above, check for proper height of the float needles regardless of which you use and properly synch the carbs and check the gas levels that’s squirting from each of the brass nozzles protruding near the slides. I believe the black floats are solid but others can chime in to verify this. What do the plugs look like after a high speed test ride?

 

[sfcpiet]

If it ain't broke, fix it till it is...

I can only echo Pauls' comment. Colour has nought to do with it as long as the weight is the same as the originals. The height can then be set to stock spec, even if the tab differs from the original. If the floats differ in weight, required height will differ from stock spec.

There are only 2 major wearing parts in the carbs that require routine replacement, needle jet and jet needle. Slides take pretty long to wear out completely. Float valve can wear eventually, as does the throttle linkage of the triples. During long lay-ups, the pump diaphragm will harden/crack and the non-return valves of the accelerator pump circuit are prone to failure.

Corrosion does other nasty things...

piet

 

[henrywillms]

My limited personal experience with this sort of issue is ignition. What ignition system do you have?