150cc upgrade no machining
 

HI all,

This may sound dumb coming from me but I really have not been keeping up with the 150cc upgrades. So I am looking to add a big bore kit upgrade for my customers that does not need machining and was wondering if anybody could tell me what the largest size bore I can order is that does not require machining. I want something that my folks can just install and go without any extra work.

thanks for the help,

John

I'd sure like to know that myself.

Most I know of is changing the jug to make it an actual 158cc. Then over stroke cranks.

you need a shorty exhaust,

Only if you port the pass thoughs, in and out, and if it is an open exhaust.

58.8mm is the largest size bore that can be installed on the GY6 engine without boring the case or a 58.5 but what is the point without a Stroker Crank. Just slapping in a 58.? is only going to give you about 5-6 more ccs around 156cc over 149.6 OEM. That will not even be noticeable to tell you the truth.
Lefty

Here are my Mods:
Lefty
Here is what my PST150H Ice Bear Trike currently has it was a 149.6cc Motor now it is 182cc motor:
62mm BBK
60mm Stroker Crank
16/37 Hoca Tranny Gears – Original were 13/40..I have 18/36 gears I have not put in yet
Reduction gear is 43 teeth
K&N Air Filter with a Short Stack
SuperTrapp Muffler
1 1/4 Header Pipe
24mm Carb
#122.5 Main Jet
#38 Pilot Jet
Peformance Coil/CDI
Manual Choke
Iridium Plug
Prodigy Variator
12g Dr. Pulley Sliders
205/65-10 Kenda Load Tires-3"s taller than OEM
29 tooth Drive Sprocket-came with 24 tooth.
DID 428 Pro V Series O-Ring Chain
Givia 29" tall Windshield
All Led bulbs Except the Headlights-I do not drive at night
4 way Flasher
Turn Signal Beeper
Relay for the Beeper connected to the Brakes
VIP Trunk with Led lights
Flasher on Vip Trunk lights
Radio with SD card,MP3 connections

Yeah on a 150 its better to go with a stroker crank, you get more cc's without machining. with a +4 crank you will be at 160cc or with a +8 you could hit 170cc.

i would like to know this myself

http://itistheride.boards.net/thread...-crank-project read this......