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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

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  #1  
Old 01-22-2009, 01:11 AM
Ron-P Ron-P is offline
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Location: Surf City, CA
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Default New here and need some tips

I just joined up and just bought my bike yesterday.

I've got an 80cc engine with 36 miles on it. Once I get above 20 mph I can start to feel some vibrations from the engine and Im looking for tips, suggestions, tweaks or mods I can do to help reduce those vibs.

Thanks and Happy Motoring,
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  #2  
Old 01-22-2009, 01:26 AM
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MB-Monkey MB-Monkey is offline
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Location: Manchester TN USA
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Default Re: New here and need some tips

check your hardware all of it on the engine kit. is the frame drilled in the front? make sure all of the lock washers are flat against the bolts thats where i would start.
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Old 01-22-2009, 07:15 AM
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Bikeguy Joe Bikeguy Joe is offline
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Default Re: New here and need some tips

They all vibrate to some degree. Some more than others, some in different places in the RPM range.

I mount mine with a piece of lead between the frame and mount, and between the "C" shaped clamp and the frame, front and rear.
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Old 01-22-2009, 09:29 AM
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seca40 seca40 is offline
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Location: Albuquerque
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Default Re: New here and need some tips

FWIW My engine is on its 3rd gallon of fuel now and I believe the vibration has subsided some. Although it is still a bit like riding an orbital sander. Make sure all the motor mounts are tight. The stock bolts strip easily so not too tight. You should get around to replacing those bolts with better quality sooner than later. Good luck.

Is your bike steel or aluminum?
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  #5  
Old 01-22-2009, 10:45 AM
Ron-P Ron-P is offline
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Location: Surf City, CA
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Default Re: New here and need some tips

Thanks for the tips guys! It is a steel frame, seca40.
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  #6  
Old 01-22-2009, 11:03 AM
Ron-P Ron-P is offline
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Default Re: New here and need some tips

Here's a pic of it...

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  #7  
Old 01-22-2009, 12:09 PM
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MB-Monkey MB-Monkey is offline
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Default Re: New here and need some tips

great looking ride i did notice that the front frame has been drilled out to mount the engine. Could be a source of vibration
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Old 01-22-2009, 12:19 PM
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reg454 reg454 is offline
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Location: michigan
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Default Re: New here and need some tips

To cut down on some noise you could get a can of spray rubber (undercoating) for like $4ish and spry the clutch cover/ magneto cover/ and the other cover on the other side of the motor. Take them off have them raised off the ground about 1/4 inch to get a good coating all over them. they should take a few hours to dry. The coating handles heat pretty well once it is completely dry plus it look cool. You can port your intake/ exhaust. You can get the SCSW expansion chamber. Mod some better mounting plates to hold the motor firmer to the frame. Get a better air filter to allow more flow. Just my opinion hope some of the stuff I suggested helps but I would try the first one I said.
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  #9  
Old 01-22-2009, 01:11 PM
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seca40 seca40 is offline
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Default Re: New here and need some tips

That's a nice lookin bike.
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  #10  
Old 01-22-2009, 05:04 PM
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Bikeguy Joe Bikeguy Joe is offline
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Default Re: New here and need some tips

The boost bottle industries thing is a bit of hype, can you really quantify 30-40% reduction in vibrations from such a thing?....if you do everything they tell you to do to your bike, before installing the boost bottle, it will improve your ride tremendously.

Going to a 36T is an exellent suggestion.
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