150cc upgrade no machining

[jdikov]

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

[wheelbender6]

I'd sure like to know that myself.

[techie610]

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

[gy6shortyexhaust]

you need a shorty exhaust,

[techie610]

you need a shorty exhaust,

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

[Lefty]

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

[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

[mmsscooters]

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.

[Frank Castle]

i would like to know this myself

[buford1488]

http://itistheride.boards.net/thread/5207/stroker-crank-project read this......