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  #1  
Old 08-09-2016, 01:01 AM
0megaMan 0megaMan is offline
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Location: Escalon, Ca
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Default Hello from California

I'm the type of guy that always needs a project, not that bowfishing season is over I'd like to build a motorized bike. I will be starting with this.....



A SE Racing single speed, CroMo frame that measures 16" from bottom bracket to top tube. I do not think I can squeeze a 4 stoke in there so I ask which kit do you guys recommend?

I've watched a million youtube videos and have come to 2 conclusions, it look like a lot of fun and the supplied brackets are chincy at best. Fortunately I'm a fabricator by trade and will be fabbing purpose built pieces to replace those one size fits all stamped brackets.

Thanks for any advice in advance.
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Old 08-09-2016, 07:10 AM
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Dave31 Dave31 is offline
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Default Re: Hello from California

Welcome to the forum 0megaMan. Looks like you have a great candidate for a motorized bicycle. Keep us updated on your prpgress
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Old 08-09-2016, 11:55 AM
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xseler xseler is offline
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Default Re: Hello from California

Howdy & welcome to the site!!
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  #4  
Old 08-09-2016, 12:36 PM
0megaMan 0megaMan is offline
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Default Re: Hello from California

The more vendors sites I go to the more it appears these 66cc motors are all the same.

Do I just find the best deal and go for it?
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  #5  
Old 08-09-2016, 04:27 PM
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MotorBicycleRacing MotorBicycleRacing is offline
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Default Re: Hello from California

Quote:
Originally Posted by 0megaMan View Post
A SE Racing single speed, CroMo frame that measures 16" from bottom bracket to top tube. I do not think I can squeeze a 4 stoke in there so I ask which kit do you guys recommend?
.
Cut a piece of cardboard 8" wide x 9 1/2" tall and place inside your frame
on the level to see if the 49cc 4 stroke motor and carb will fit.

Welcome to the forum from SoCal.

Last edited by MotorBicycleRacing; 08-09-2016 at 09:39 PM.
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  #6  
Old 08-09-2016, 09:25 PM
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Tyler6357 Tyler6357 is offline
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Default Re: Hello from California

Quote:
Originally Posted by 0megaMan View Post
The more vendors sites I go to the more it appears these 66cc motors are all the same.

Do I just find the best deal and go for it?
Wait, not all 2 stroke china girl engines are the same. It might have been true in the past but not anymore. Here are a couple videos for you to watch that explains some of the differences. I think the PX80s are better than the GT5s but that is just my opinion.

https://www.youtube.com/watch?v=rzLWYSlpFEg

https://www.youtube.com/watch?v=MMZqayAYsWo

Also, that frame looks like a good start, it appears to be steel which is better for vibration and strength, get a front break for it.

Last edited by Tyler6357; 08-09-2016 at 09:29 PM.
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  #7  
Old 08-09-2016, 10:41 PM
0megaMan 0megaMan is offline
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Location: Escalon, Ca
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Default Re: Hello from California

Quote:
Originally Posted by Tyler6357 View Post
Wait, not all 2 stroke china girl engines are the same. It might have been true in the past but not anymore. Here are a couple videos for you to watch that explains some of the differences. I think the PX80s are better than the GT5s but that is just my opinion.

https://www.youtube.com/watch?v=rzLWYSlpFEg

https://www.youtube.com/watch?v=MMZqayAYsWo

Also, that frame looks like a good start, it appears to be steel which is better for vibration and strength, get a front break for it.
This is the kind of insight I was looking for.

Thanks for the links I will check those out. As for the bike frame it is Cromoly like I mentioned in my first post., probably will have to get a beefier fork possibly a suspension fork.

Last edited by 0megaMan; 08-09-2016 at 10:51 PM.
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  #8  
Old 08-09-2016, 11:29 PM
0megaMan 0megaMan is offline
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Location: Escalon, Ca
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Default Re: Hello from California

Quote:
Originally Posted by Tyler6357 View Post
Wait, not all 2 stroke china girl engines are the same. It might have been true in the past but not anymore. Here are a couple videos for you to watch that explains some of the differences. I think the PX80s are better than the GT5s but that is just my opinion.

https://www.youtube.com/watch?v=rzLWYSlpFEg

https://www.youtube.com/watch?v=MMZqayAYsWo

Also, that frame looks like a good start, it appears to be steel which is better for vibration and strength, get a front break for it.
I watched the videos, seems like great information on how to determine which engine you have if you're ordering parts. However I didn't take away anything from them that would help me determine which type is better and why.

Last edited by 0megaMan; 08-09-2016 at 11:36 PM.
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  #9  
Old 08-09-2016, 11:58 PM
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Tyler6357 Tyler6357 is offline
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Default Re: Hello from California

Oooops...I meant PK80 not PX--that is just a typo
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  #10  
Old 08-10-2016, 12:05 AM
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Tyler6357 Tyler6357 is offline
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Default Re: Hello from California

In the video he says that the PK80s are 40 stroke and the GT5s are 38 stroke, this makes a difference. The 40 stroke ones all use the type "B" piston and the shorter connecting rod except the A80 and the half breed ones which are not very common. The GT5s use the longer connecting rod and are only 38 stroke.
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