Fooling around with some new premier carbs on my 71 T120 I tried the old AMAL
idea of using an old drain plug with a tube fixed into it to measure in situ float height. Made a nice new tool but was sadly not successful. Firstly the carbs are not level (something I had looked at 1000 times but never registered before) which made accurate reading very difficult. The heights I obtained were clearly not correct , one was 10 mm too low the other 5 mm too high despite having checked the float height from top rim previously so I know I was in the ballpark (and both plugs looked identical from previous checks). Something is messing up the readings, a constriction somewhere or something like that. Anyway thats for another day.
After finding lots of aluminium bits in the drain when taking the above measurements of my almost (200km) brand new carbs, I've found a few posts that indicate also finding loads of chaff in them. I did inspect and blow the carbs out with air when I purchased them a year or so ago so I did not expect this.
Made me think that maybe this is from new wear? So i had a good look at the hard anodised slides and the carb body and it seems to have a lot of wear for 200 km.
I've never been fortunate enough to buy a carbed vehicle from new so have no idea whats normal (and with a new vehicle one would probably never look at the carbs for the first few thousand KM anyway) but I was a bit surprised by what I saw.
What do you folks think - normal?
Here is a picture of the chaff that came out of left carb (right was the same).
Carb body wear
I was very carefully to install the Carbs correctly - no over tightening of the flanges and lid - running standard air filters so should not get much grit, etc.
Finally there were some strange machining/scratching marks that seemed to close of the outer pilot exit hole slightly. Admitted I measured it very roughly by prodding gently with the smooth sides of minature drill bits. Here you can see it after the prodding - the chaff fell away while doing this - the hole is now the same as on my other three carbs. Borth carbs showed such markings in this area.