Motorized Bicycle Engine Kit Forum
Register FAQ Members List Calendar Mark Forums Read


Search Titles Only

Sponsors
To be a sponsor Contact Us
Our Forums


Go Back   Motorized Bicycle Engine Kit Forum > Bicycle Motor > High Performance Bicycle Engine Tips

High Performance Bicycle Engine Tips We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us.

Gt5 Stroker


Discussion at Motorized Bicycle Engine Kit Forum in the High Performance Bicycle Engine Tips forum. ok so i'm building a half power king (top end) on lower end of a skyhawk gt5 turns out ...
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 11-08-2009, 05:46 PM
flybytaco's Avatar
Motorized Bicycle Elite Member
 
Join Date: Oct 2009
Location: seekonk MASS
Posts: 113
Default Gt5 Stroker

ok so i'm building a half power king (top end) on lower end of a skyhawk gt5 turns out the pin of the powerking is 4mm lower than the pin on the gt5 so when the jug is on the piston sticks out 4 mm. so I went to my friends fab shop and machined a 3.2 mm spacer out of aluminum and spaced the jug with 2 gasket 1 on top of spacer 1 on bottom for a combined thickness of 4 mm so I guess I have myself a stroker motor cant wait to run it.. lemme know your thaughts... BTW i'M CALLING IT THE PEEJET LOL srry for yelling
__________________
couldnt build my bikes without PIRATE CYCLES and billet from CREATIVE!!!!! THANKS JUSTIN!!
Reply With Quote
  #2 (permalink)  
Old 11-08-2009, 06:07 PM
Motorized Bicycle Elite Member
 
Join Date: Feb 2009
Location: Syadney,Australia
Posts: 104
Default Re: Gt5 Stroker

oh my

very very nice.

please post pics
Reply With Quote
  #3 (permalink)  
Old 11-08-2009, 06:47 PM
Motorized Bicycle Elite Member
 
Join Date: Feb 2009
Location: Syadney,Australia
Posts: 104
Default Re: Gt5 Stroker

curious. which con rod/piston are you using in which combo

edit :

hang on, if i've read this right if i used the rod/piston front the powerking with my skyhawk i can get the same effect ?

Last edited by impression : 11-08-2009 at 06:50 PM.
Reply With Quote
  #4 (permalink)  
Old 11-08-2009, 08:08 PM
flybytaco's Avatar
Motorized Bicycle Elite Member
 
Join Date: Oct 2009
Location: seekonk MASS
Posts: 113
Default Re: Gt5 Stroker

Quote:
Originally Posted by impression View Post
curious. which con rod/piston are you using in which combo

edit :

hang on, if i've read this right if i used the rod/piston front the powerking with my skyhawk i can get the same effect ?
i used the piston,cyl,head from power king the rod and bottom end skyhawk also changed the wimpy top bearing with the nicer pk one adding the billet intake the racing carb and a chrome gen3 pk muff I baught 2 new motor kits to do this lol need to order a pk piston now to build the pk bottom end with the skyhawk top end because the pin height is to high so the piston doesnt go to the top of the jug its too short.. where can i get a pk piston?
__________________
couldnt build my bikes without PIRATE CYCLES and billet from CREATIVE!!!!! THANKS JUSTIN!!

Last edited by flybytaco : 11-08-2009 at 08:10 PM.
Reply With Quote
  #5 (permalink)  
Old 11-08-2009, 08:10 PM
Bikeguy Joe's Avatar
Godfather of Motorized Bicycles
 
Join Date: Jan 2008
Location: Ashtabula county, Ohio
Posts: 7,081
Default Re: Gt5 Stroker

Have you measured the bore and stroke yet?
__________________
If it ain't broke, and you mess with it long enough, it will be.
Reply With Quote
  #6 (permalink)  
Old 11-08-2009, 08:11 PM
Bikeguy Joe's Avatar
Godfather of Motorized Bicycles
 
Join Date: Jan 2008
Location: Ashtabula county, Ohio
Posts: 7,081
Default Re: Gt5 Stroker

What were the SkyHawk's stock measurements?
__________________
If it ain't broke, and you mess with it long enough, it will be.
Reply With Quote
  #7 (permalink)  
Old 11-08-2009, 08:20 PM
flybytaco's Avatar
Motorized Bicycle Elite Member
 
Join Date: Oct 2009
Location: seekonk MASS
Posts: 113
Default Re: Gt5 Stroker

i beilieve the stroke is 40mm so now if i'm correct on the 40 mm thing it's now 44mm dont know the sroke of the pk but its 68.5 cc
__________________
couldnt build my bikes without PIRATE CYCLES and billet from CREATIVE!!!!! THANKS JUSTIN!!

Last edited by flybytaco : 11-08-2009 at 08:23 PM.
Reply With Quote
  #8 (permalink)  
Old 11-09-2009, 01:11 AM
flybytaco's Avatar
Motorized Bicycle Elite Member
 
Join Date: Oct 2009
Location: seekonk MASS
Posts: 113
Default Re: Gt5 Stroker



__________________
couldnt build my bikes without PIRATE CYCLES and billet from CREATIVE!!!!! THANKS JUSTIN!!
Reply With Quote
  #9 (permalink)  
Old 11-09-2009, 10:16 AM
camlifter's Avatar
Motorized Bicycle Elite Member
 
Join Date: May 2009
Location: acme labs
Posts: 176
Default Re: Gt5 Stroker

i did something similar to a jet 80, not stroking it. but i added a spacer under the jug raising it .125", then cut .125 off of the top of the jug, there by raising the ports .125", increased the bottem end and mid range power without hurting the top end any. just make sure your not letting any over lap into the port timing. when the piston is at bottom dead center you should not be able to see through the intake port into the cylinder.
__________________
www.acmemotorbikes.com
Reply With Quote
  #10 (permalink)  
Old 11-09-2009, 06:30 PM
flybytaco's Avatar
Motorized Bicycle Elite Member
 
Join Date: Oct 2009
Location: seekonk MASS
Posts: 113
Default Re: Gt5 Stroker

ok so this motor is the fastest one i've ever built. i let my friend ride it and he said it screws lol I was in the dirt earlier racing him and was passing him slidin out sideways like he wasnt really moving. he has a gen2 a 58cc starfire which revs to the moon. but this beejet revs right there with it and pulls the only mod i did to the cylinder was widened and tapered off the exaust port and chamfered the edges of all the ports. did not raise any ports..
__________________
couldnt build my bikes without PIRATE CYCLES and billet from CREATIVE!!!!! THANKS JUSTIN!!
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 05:26 PM.


Sponsors
To be a sponsor Contact Us
Donations accepted!

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.1.0
Motorized Bicycle Engine Kit Forum