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High Performance Bicycle Engine Tips and Motorized Race Bicycles We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. Also check out some of our racing members builds


Motorized Bike Performance Upgrades

We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. Also check out some of our racing members builds


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  #1  
Old 05-20-2013, 06:03 PM
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So I have a BGF China girl motorized bike on a fixie, and I'm looking for upgrades I could use with it to make it perform better. It is a good bike, but I want it to run good n' fast for as long as possible. In this time frame, I'd like to get good performance too. I'm aware of the red "speed carb" that is very cheap on ebay, but I'm wondering what that will do to help.
Thanks, and sorry for me being a noob here!
-Zane Smith
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Old 05-20-2013, 06:56 PM
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Default Re: Motorized Bike Performance Upgrades

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Originally Posted by CARider View Post
So I have a BGF China girl motorized bike on a fixie, and I'm looking for upgrades I could use with it to make it perform better. It is a good bike, but I want it to run good n' fast for as long as possible. In this time frame, I'd like to get good performance too. I'm aware of the red "speed carb" that is very cheap on ebay, but I'm wondering what that will do to help.
Thanks, and sorry for me being a noob here!
-Zane Smith
A Speed carb will give you a good idle, but not much extra performance. The best bang for the buck would be a SBP expansion chamber, a well chosen rear sprocket, and jetting/tuning. You should be able to get any "80" to run 35-40 mph with just these mods.
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Old 05-20-2013, 08:11 PM
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Default Re: Motorized Bike Performance Upgrades

I agree. A tuned pipe and proper tuning is the first upgrade to look into. Once you have it running right, you can gear it to your needs.
In my opinion, the stock carb is fine with a stock cylinder. Once you get beyond that point, you should have a pretty decent idea what to do next
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Old 05-20-2013, 10:43 PM
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Smile Re: Motorized Bike Performance Upgrades

Thanks for the info! That was very helpful. Now I have another question: has anyone here ever had problems with squeaking noise coming from the clutch/engine sprocket area? It seems to go away (I think) when I ride it, but when I'm pedaling with the clutch in or just moving it, I hear the sound.
Thanks again for all your help!
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Old 05-21-2013, 12:11 AM
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Default Re: Motorized Bike Performance Upgrades

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Originally Posted by CARider View Post
Thanks for the info! That was very helpful. Now I have another question: has anyone here ever had problems with squeaking noise coming from the clutch/engine sprocket area? It seems to go away (I think) when I ride it, but when I'm pedaling with the clutch in or just moving it, I hear the sound.
Thanks again for all your help!
Grease your clutch.
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Old 05-21-2013, 09:31 AM
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Default Re: Motorized Bike Performance Upgrades

Alright. Thanks again!
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Old 05-21-2013, 12:21 PM
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Default Re: Motorized Bike Performance Upgrades

As for your "performance mods".....Do ONE thing at a time. Don't add a bunch of stuff all at once. The reason is if there's a problem you won't know where to look for it. Also making your changes one at a time will give you a basis of comparison to work with.
Good luck.

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Old 05-21-2013, 04:12 PM
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Default Re: Motorized Bike Performance Upgrades

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Originally Posted by Tyler6357 View Post
Grease your clutch.
I think you're trying to say, grease the transmission shaft? Actually greasing the clutch wouldn't be a good thing lol.

On the clutch side it is a good idea to grease the pinion gear.
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Old 05-21-2013, 08:40 PM
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Default Re: Motorized Bike Performance Upgrades

If you want to yank the engine and have the tools to do this....deck and polish the head, port the exhaust port, and port your intake manifold.


*threadjack* *argh!*

Will a kind of tall cone filter fit in a Cranbrook frame without need an offset intake?

*threadjack over*
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Old 05-21-2013, 11:23 PM
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Default Re: Motorized Bike Performance Upgrades

Aw man Tyler! I have grease all over my clutch handle now. Dang it. My bike is ruined.



No, thanks guys, I opened it up and greased the transmision shaft, and it fixed the problem right away. Thanks!

Thanks dodgedude, I've got it now.

I'm going to try to get some pictures of my bike up here. It's the same bike as the "McDonalds" colored fixie from Walmart, but it is this Target version that is white and green. I've noticed each store that carries bikes around here has their own paint job and brand name for the exact name bike.
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