A 155c kit with a ported head works great, my red dune 150 has a port and polished head with a srp 155cc higher compression piston orange cdi uni filter a12 cam 122 main jet and it runs awesome. The stroker crank is a lot more work and money, but still worth it. I would recommend first a 155cc kit with a ported head and bigger cam first. And the stock muffler needs to be opend up or replaced with a higher flow muffler.
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