H25 or H30

[f4radar]

I picked this up at an estate sale today. No tag, the bore is about 2 5/16. I’m wondering what is the easiest way to distinguish an H30 from a H25

 

[markus]

No difference between them, They usually spec out the same in that timeframe, carb stamp number start with a "99"?

 

[f4radar]

No difference between them, They usually spec out the same in that timeframe, carb stamp number start with a "99"?

Thanks Markus. This is the carb that came with it. Looks like 71 which seems about right.

 

[markus]

Thanks Markus. This is the carb that came with it. Looks like 71 which seems about right. View attachment 302125

doesn't help, that shows as coming off a vertical engine, hence the choke lever changeout

 

[f4radar]

doesn't help, that shows as coming off a vertical engine, hence the choke lever changeout

That makes sense. I’m wondering what accounted for the 1/2 horsepower difference between the 2.5 and 3.0…cam?

 

[markus]

That makes sense. I’m wondering what accounted for the 1/2 horsepower difference between the 2.5 and 3.0…cam?

decal and the stamp on the tag . carbs do show as different sometimes (original parts numbers) but use the same parts so there may be a restriction in one of the passages or jets, but the superseded parts numbers and or "service carbs" always end up the same in the end. engines internally though are exactly the same between the 2 when compared in the same timeframes