Hi Jim, last weekend run a Miss LLumar owned for my nephew with his new OS.18CV Marine Belt star, it fit perfect without big or complex modification, the result is the boat run very well with less weight and not lost compression like pull start engines, the Llumar show more speed than stock Dynamite.15. Next weekend we`ll continue making a break-in and next step change the prop with Y535 and M435 (octura). I hope more speed.

I'm agree with Mr. Olson and personally think that .21 are a good power option but it so heavy for the hull, and medium windy or choppy water conditions made trouble for a Miss LLumar with .21 engine. The LLumar is small and is affected by the small waves easy.

The Dynamite don't say clear how many HP have .15 engine (+-0.6hp) but OS. say very clear tht OS18 Have 1.3 HP like OS21 XM outboard engine that won tunnel races.

you can see a picture for this in:

http://putfile.com/cristian_aldana/images

Good Lucks