After reading all the posts there is one item not mentioned that purely separates the two engines you mention. Yes they will do the same work , per second , but does the phrase "duty cycle" ring a bell? How long continiously do you suspect that 12000 rpm engine will DO the same work as the 2000 rpm tractor engine? Now we see the diference. Gear down that 12000 rpm engine so it will pull a 20' disc and put it and the tractor beside ea other and that bike engine will be toast in 200' , the tractor will pull it indefinately. So to answer your post...YES HP is a very poor measurement , in and of itself , of the capabilities of a machine , period..
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