Hi...advice please: I have two engines and I'm wondering whether the components are interchangable.

One engine, which had been lying around a long time, has the bores/heads filled with crud because the spark plugs had been left out! But the cam is better than from the second engine, which had a nasty knock. I was hoping to mix and match!

One engine is AM2, on the engine plate, and the other is A06 635.

I realize that engines are not necessarily standard units like Meccano sets, but I am hoping the cams, oil-pumps,barrels are.

Thanks

Have you got the engine numbers, from which it's usually possible to determine the year of manufacture of an engine?
From what I can recall, the only thing you'd need to be careful with is to keep all of the oil pump components together, since the AM2 could be old enough to have the thinner oil pump rotors; the changeover was in 1980, prior to that, they were 10.5mm, later ones were 11.2mm.
Fit the thinner ones to a later pump body and you will have oil pressure problems.

Ken

p.s. If one of them is a Vege reconditioned unit, the rear main bearing will have been reground, so would need a smaller diameter oil seal.

Thanks for the info Ken.

How can I tell if the rebuild has been done?

I had a search for a database for engine numbers without sucess. Where would I find it?

I have attached pix of the ID plates.

Would the cranks be the same?

Number on the A06 is: 0901052881

Chris

just a couple of years difference - nearly everything will be the same flywheel/clutches and carb jets were the only thing that really changed

Chris, as Sean has already advised, just a couple of years between those engines; the 'black label' one is 1979 and the 'red label' is 1981, so you do need to be careful with the oil pumps.
No need to worry about a reground crank, the label would have been 'échange standard' if it had been a factory reconditioned unit.

Ken

Thanks Sean and Ken, that gives me a basis on which to work.

Regarding my continuing tinkering with the carb, I have noticed that there appears to be an air leak, both ends, on the choke spindle: when I squirt carb cleaner the rpm increases.

Is there a 'trick of the trade' to solve this or is it a new top?

Thanks again.

Err,
the choke spindle is 'upstream' of the throttle butterflies, so an air leak there isn't something to worry about, is it?

Thanks again Ken for your sound observation.

Must have been the excessive heat in my garage causing my grey matter to soften!

Apropo the spindle: why are there two grooves cut in?

Looks to a dummy like me they could be for O rings, although of course the tolerance is too tight.

Thanks