G'day Alan, The primer bulbs to fit the carby caps have never been available as a separate part, as far as I know. As the plastic of the cap is hot crimped over the bulb flange during manufacture, it's not designed to be replaced other than as a complete assembly.
As far as distinguishing OEM from aftermarket, the genuine Victa caps have the Victa part number, CR03501A, in a moulded panel above the 'level line'. The aftermarket caps I've seen here don't have this feature, for what that's worth..
Cheers, Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
No, you definitely don't replace the primer bulb on these things. Out it all goes! I have actually kept one of those previously unwanted plain grey caps without the primer because, at least you know you will get a perfect fit around the edges, even if you need to give your right arm more of a workout. Also, there was the version with the remote primer, which can be replaced, if you can find them these days.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
I picked up another 5 of the new ones yesterday from a bloke who ended up with them from a mower shop that closed down and as Gadge said they don't have the part number on them, but it doesn't matter to me because they don't work, so I pull the seat out and fit a Briggs seat and then make up a needle to suit.At least this way they work, unlike the aftermarket rubbish . The bloke I got the primer caps from had a bag of probably 50 needles and I told him to just throw them in the bin, waste of time even trying them, not worth the fuel you waste trying to get one to work
G'day Alan, The primer bulbs to fit the carby caps have never been available as a separate part, as far as I know. As the plastic of the cap is hot crimped over the bulb flange during manufacture, it's not designed to be replaced other than as a complete assembly.
As far as distinguishing OEM from aftermarket, the genuine Victa caps have the Victa part number, CR03501A, in a moulded panel above the 'level line'. The aftermarket caps I've seen here don't have this feature, for what that's worth..
G'day Gadge,
Yes, the cap I have just found in my workshop seems to be original as it has the CR03501A part number exactly where you described it would be. I managed to pull the old primer bulb off easily enough but you are right, it's not as easy to put it back on again.
One thing I did notice though is under the bulb (once removed) I can see a Victa part number: CR03560A?
A year ago I paid �27 for my last original cap from a seller on Amazon UK........ Ouch..!!
As you have said Mowerfreak, I think I will also just keep the caps that I have, seal up the hole and give my arm a bloody good workout rather than pay money like this every couple of years..!!!
For this reason alone I really cant tell you how much I appreciate the workmanship that went into the simple, but effective G3 Carby..!!
I have bought a few new aftermarket caps for $7, then they were $15... too much as they all perish after time. It's only a primer, so I used a piece of tubing to first blow then suck to get some fuel to prime. It worked. Then I put a Brigs & Stratton primer bulb in, had to be careful pushing it in, and it's not glued or melted in. But it hasn't come out and has lasted a year. I felt ripped off. speedy
........................Keep your blades sharp......................
Hi Alan, Sorry it was just one I had, maybe they are all the same. I measured it and tried to buy those plastic primer bulbs, but couldn't find right ones. speedy
........................Keep your blades sharp......................
Hi Mowerfreak... I tried It on my Powerplus yesterday and it works great..!!
As I said earlier, it's really difficult to seat it into the recess without using some silicone, but when you do it's a real snug fit. I cant see it falling out anytime soon as it's even difficult to pull out by hand.
Thanks for the suggestion Speedy, I'm well chuffed, it saves me spending out stupid amounts for replacement caps in future..!!
Good lord!! Have you tested to see if it works yet? They must make them to a standard size to fit like that. 
