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Here is my weird take on it, and this is coming from a guy that has put a lot of time and a little bit of money into his CG clone trying to get more performance out of it.
You could spend quite a lot of money chasing power out of one of these engines. stainless valves, custom piston, cam, etc. Heck, even a small ihi turbocharger. You might get an impressive 25hp or so out of it, even without forced induction
Or, you could buy a used XR250R engine, instantly have 25hp, gain a 6th gear, have factory reliability, and all you need is to maybe fab a couple of mount brackets.
Sounds like a strange thing coming from me, but my pursuit of better performance from my Hawk engine is purely just because I love to tinker around. My whole goal was to get as much as I could with minimal investment. Porting the head myself only cost me maybe 40 bucks. The cam I ordered, 95 bucks. The carb I have, which I could have gone cheaper and probably had the same results, also 95 bucks (cheaper route is about 35 dollars).
At the end of the day, if I took this sub 15hp rated engine and got it to make even 22hp, I would be happy and impressed with the results. One thing I have always been cognizant of is the nature of this engine. It is a 2 valve pushrod engine made in China. It will have limitations, and it will never be as good as many other engines out there.
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