Difference between VT.21 and .25?

HP engines (Hirtenberger, AG Austria) tech support. Owned by RJL Industries since 1990

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Difference between VT.21 and .25?

Postby Longdan » Fri Aug 31, 2007 2:50 am

I have a brand new Austrian made VT.25 that I am running in on the bench at the moment. I must say that this has to be the smoothest running engine I have ever seen! And the quietest.
I was just wondering what the difference is between the VT.21 and the VT.25. They look identical from the outside.
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Postby MECOA » Sat Sep 29, 2007 7:13 pm

All the castings are different but the internals are the same except for the bore. The carb throat is also larger.
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