With a stock carb, stock Revo pipe I was seeing a consistent 40mph with good torque on a ds50. Upgraded to a 20mm phbg, and man it's a smooth quick ride all the way to 50mph. Still has more to give too. And this is all on a stock pipe. So rad.
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supreme rippage
April 28, 2015
taco eater :
Andy Swoop from Atlanta, GA United States
WOW! This kit is a RIPPER. Comes a hair on the conservatively ported side, mostly due to how small the exhaust port is on the flange, but 30 minutes with a dremel and it is a very very mean kit. If you wanted to spend some serious porting time I have no doubt this would be the fastest derbi kit.
Out of the box, the casting and finish quality is impeccable, waaaay better than the metra 43.5 or 47. You don't even need to chamfer the ports, they're already buttery smooth.
x2 what Willie said, hands down the best kept secret in Derbis and probably the best Derbi kit over-all.
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best kit for flat reed shhhhh
December 16, 2014
taco eater :
Will caldwell from san francisco, CA United States
secret....this is the best kit for flat reed. i put like a billion miles on one (seriously like 6k HELLA dubs miles with large men on the back) and its still rippin...im gonna slap so new rings on it and keep rippin it.
oh yeah i used this kit on the transamerica trail ride on my start 5 motor....perfect balance of torque/top end/gas mileage/reliability. 47mm metra is sick but thats blehhh it'll just break ya know.
Feed the beast 
