We are offering for sale

Soft Mount Kit - enhanced
for Weber 40 DCOE
Dellorto 40 DHLA
Solex 40 ADDHE


Material: Aluminium

Although there is little to choose between the performance of thackeray washers and rubber cushion grommets, each has its own durability problem.

Thackeray washers, as any other spring, experience metal fatigue and will ocassionaly break. The culprit, of course, is high frequency engine vibration. 7000 RPM seems to be the magic number. Above that, 20 to 50 hours of running is about all you can expect of the upper thackerays, which are the ones that fail. The lower ones have little load on them and live forever.

The cushion grommets don't have this problem, but do have one of their own. The inevitable fuel leakage out of the carburetor manifold joint will eventually attack and rot the lower grommet. The upper ones, of course, have little fuel contact and last forever.
TIP: Use thackerays on the bottom and grommets on the top for optimum soft mount life.







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Soft Mount Kit
  • enhanced
for Weber 40 DCOE Dellorto 40 DHLA Solex 40 ADDHE Material: Aluminium Although there is little to choose between the performance of thackeray washers and rubber cushion grommets, each has its own durability problem. Thackeray washers, as any other spring, experience metal fatigue and will ocassionaly break. The culprit, of course, is high frequency engine vibration. 7000 RPM seems to be the magic number. Above that, 20 to 50 hours of running is about all you can expect of the upper thackerays, which are the ones that fail. The lower ones have little load on them and live forever. The cushion grommets don't have this problem, but do have one of their own. The inevitable fuel leakage out of the carburetor manifold joint will eventually attack and rot the lower grommet. The upper ones, of course, have little fuel contact and last forever. TIP: Use thackerays on the bottom and grommets on the top for optimum soft mount life.