The primer bulbs on these are particularly robust, I find it very rare to come across a split or hard bulb. Must be made from some good material because some of the ones I end up with must be about 40 years old
I've got a 'project mower' in hand just now, so that I can do 'how-to' write-ups on a few repair techniques; a 1982-3 season Mayfair MK326A1 full crank 160 Ute.
The primer bulb was a bit hard/stiff, so I gave it the Armor-All treatment [which I've also had occasion to use on hoses; e.g. oxy set twin hose], and it did work very well, as expected.
Guys,
I have thrown away and replaced a few of the G4 primer caps purely because the bulbs have gone brittle and cracked.
Surely there must be replacement bulbs available? I would rather re-use what appear to be original caps (I have saved a couple) and just replace the bulbs.? Reading this it must mean that the caps I have been buying from a reputable dealer over the years aren't original if I can only get 2 to 3 years out of them..??
I have taken a few measurements, the most critical one I think is the bulb flange diameter which appears to be 24mm. I cant see anything on ebay that would be close, 22mm is about as near it gets.... but thats not close enough.
Original parts are not that easy to come by here in the UK now, bulbs perishing maybe down to our climate/fuel etc, but if there is a problem with the valve seats/dimensions/needles in the repo caps then it makes sense to me to hang on to what could be a frugal fix?
