The HF engines are just like anything else you get from there, most times they are great, but sometimes you get a junker. Get the extended warranty, if you can. I know a couple of kart racers that use these engines with and without hop ups and they both said to buy one. There are hop up parts available, if you are looking, that shows how popular they are.
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'04 Dazon Raider 150 'modded'
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