Looks similar to whats on the LV30/2 ive got here, just the carb is a bit different.
That looks to be a pretty similar linkage setup to the Tecumseh motor. Id say if you can find one it would be pretty easy to make it work.
A rusty Victa would be the mower to look out for.
3/8 unf is 8.5mm preffered drill size. alternate is 8.4
10x1.5mm is 8.6mm or 11/32 preffered drill size. alternate is 8.5
10x1.25mm is 8.9 which is probably too big.
Everthing else is well short of 8mm. And between the 8 and 8.5 its exotic.
Only apprehension i would have would be trying to thread the hole if there is still remanants of a formed thread still in it. When trying to cut in with the tap the tap may want to follow the old threads and pull sideways making a big mess.
Because its a blind hole i was thinking you may not be able to get right down in it with a standard pointed drill. Ditto with a starter thread tap.
Without having the carb in my hand i would say that the 3/8 unf could be a good option.
Grind the point off a 8.5mm drill bit, not right the way flush or it wont do its job. Carefuly drill. A cordless drill perhaps (even one with a battery thats a bit flat), or even one of those old hand drills.
You would need either a start or intermediate tap and a finishing tap, and use lubrication.
A short 3/8 unf bolt could be bought from just about anywhere. They have them here at bunnings hardware stores in blister packs, they are zinc or cad plated or something which would be a better idea than a plain black bolt. Stainless steel is not reccomended to be in contact with aluminum.
Just a side note. Cheap brand cordless drills. Just about every man has one in the shed thats got a stuffed battery. An old car battery some leads on the drill with alligator clips on the end and they work awesome. Ive got an 18V GMC here and ive done heaps with it hooked up to a car jump starter pack.
Auto elec that fixed my truck had set a drill up like this, thought i would give it a go as well.
Bob.
