00:00Stock 50 cm3 cylinders run slow
00:0447mm big bore kit bump displacement to 70 cm3
00:08More torque, more top speed, cheap price
00:11Compare stock against 47mm big bore, test best kits find today
00:17First, Derby D50B02 stroke engine kit
00:21Fit GPR racing, Senda R, SMDRD
00:26Feature, come complete cylinder and head, handle heat better than stock cast iron
00:31Cost $93.80
00:34Over 3,000 sales, clean 5-star rating
00:38Worth money because full top-end replace, instant power jump
00:42Second, Piaggio liquid-cooled kit
00:45Fit NRG Power DD, MC3 Pure Jet, Zip SP feature
00:50Precision cut port timing match stock crank without case carve
00:53Cost $68.35
00:57Sold over 3,200-unit, 5-star score
01:00Best value upgrade convert slow commuter into fast street machine
01:05Third, Air-cooled Suzuki kit
01:07Fit Address 50, Katana, Sipia ZZ, AG50, AD50
01:13Feature, direct bolt-on cooling fins match stock air shroud exact
01:17Cost $64.04, hold 4.4-star rating across 3,000 rider
01:24Reliable iron block handle abuse, fix low-end hill climb struggle
01:29Fourth, Aprilia 10mm wrist pin kit
01:32Fit Area 51, Gulliver, Rally, SR50 Stealth, Sonic
01:37Feature, light piston run dual ring for long ring life, high compression
01:41Cost $67.99, perfect 5-star score
01:46Stock cylinder choke at high RPM, this kit open exhaust flow wide
01:51Fifth, Yamaha Minarelli Jog Clone Kit
01:55Fit Chinese 2-stroke moped, ATV, John Wei, Rokita
02:00Feature, lowest price entry into 70 cubic centimeters power
02:04Cost $43.60
02:07Over 2300 sold, solid 5 stars
02:11Replace worn stock 40mm barrel with 47mm slud for pocket change
02:17Links for parts down in description
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