AussieSteve
Active Member
I finally got sick of using Permatex, (and cleaning it off), every time I removed and refitted the carby.
I've considered the traditional 'o' ring approach, but it's not mechanically reliable, in my opinion. (Three hands are needed - one to push the carb firmly against the 'o' ring and two to tighten the clamp bolt. Even then, a perfect seal can't be assured.)
Here's an 'o' ring method that should be reliable.
I used a 100mm 'warding b a s t a r d' file, about 1-1.2mm thick and cut a 1.5mm groove about 2mm from the end of the (after-market alloy, $10) inlet tube, to fit an 'o' ring. I finished off with a green (nylon?) pot scouring pad, to remove any rough edges before fitting the 'o' ring.
A smear of 2-stroke oil helps when fitting the carby.
No more problems, (I anticipate).
I measured the 'o' ring as best I could:-
ID=16mm OD=19mm (Cross-section diameter=1.5mm)
Fits like a glove. Any similar 'o' ring would do it, just cut the groove to suit. Not too thick, though, or the groove will need to be too deep.
After the groove is cut, the 'o' ring fitted and the carb tested for fit, it's not a bad idea to remove as much metal as possible from the end of the tube, to move the 'o' ring closer to the end. This will ensure a really good seal. (That's next, down to about 1.5mm)
Found a local supplier with 'o' rings that are close, if stretched slightly. Actually, it sounds like a common size and probably isn't hard to get. I suspect that the one I'm using is exactly that size and that my measuring was out. We'll see.
For Aussies:-
30c each. $7.70 deliv, though. I bought a good few.
Fitch Rubber, Adelaide, Australia
... Steve
I've considered the traditional 'o' ring approach, but it's not mechanically reliable, in my opinion. (Three hands are needed - one to push the carb firmly against the 'o' ring and two to tighten the clamp bolt. Even then, a perfect seal can't be assured.)
Here's an 'o' ring method that should be reliable.
I used a 100mm 'warding b a s t a r d' file, about 1-1.2mm thick and cut a 1.5mm groove about 2mm from the end of the (after-market alloy, $10) inlet tube, to fit an 'o' ring. I finished off with a green (nylon?) pot scouring pad, to remove any rough edges before fitting the 'o' ring.
A smear of 2-stroke oil helps when fitting the carby.
No more problems, (I anticipate).
I measured the 'o' ring as best I could:-
ID=16mm OD=19mm (Cross-section diameter=1.5mm)
Fits like a glove. Any similar 'o' ring would do it, just cut the groove to suit. Not too thick, though, or the groove will need to be too deep.
After the groove is cut, the 'o' ring fitted and the carb tested for fit, it's not a bad idea to remove as much metal as possible from the end of the tube, to move the 'o' ring closer to the end. This will ensure a really good seal. (That's next, down to about 1.5mm)
Found a local supplier with 'o' rings that are close, if stretched slightly. Actually, it sounds like a common size and probably isn't hard to get. I suspect that the one I'm using is exactly that size and that my measuring was out. We'll see.
When they arrive, I'll report.(Fitch Rubber)
Size is: imperial O ring 5/8" ID x 1/16" cross section which should come out at about 15.9mm ID x 18mm OD. They are fuel resistant.
For Aussies:-
30c each. $7.70 deliv, though. I bought a good few.
Fitch Rubber, Adelaide, Australia
... Steve
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