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Mounting Techniques for Bicycle Motors Every frame is different. Share and ask questions about mounting your engine kit to your frame or rack

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  #1  
Old 04-15-2016, 04:14 PM
Soylentbob Soylentbob is offline
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Default Motor mount on a 24" bike

I wasn't sure where to post this so hopefully someone can help. I was looking at some of the Chinese made gas bike kits on ebay, but it appears they are for a 26"-28" bike. I have a 24" bike, partly because I'm for very tall and don't want to tip-toe my bike when I stop. I was wondering if there is a way to mount the kit onto a 24" bike and make it work properly?
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Old 04-15-2016, 04:50 PM
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2door 2door is offline
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Default Re: Motor mount on a 24" bike

All depends on the frame. I've built two 24" bikes that required no modifications or special mounts. You need to check for clearance for the carburetor and spark plug. If space dictates there are off-set intake manifolds available as well as slant heads and shorty spark plugs.

Spoke count is also a factor. You'll want 36 spoke rims as opposed to 32 if you plan to use the kit sprocket adapter of most aftermarket adapters.

Tom
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Old 04-15-2016, 06:03 PM
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allen standley allen standley is offline
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Default Re: Motor mount on a 24" bike

I've built 2 diamond frame 24s. Both needed the offset intake.
easy item to find. They look like this.
http://thatsdax.com/ENGINE_KIT_PARTS_PAGE_2.html

Also be sure the carb has the rubber O ring in place before inserting the new offset into the carb. Looks like this.
Attached Images
File Type: jpg O Ring.jpg (4.4 KB, 4 views)
File Type: jpg O Ring placement.jpg (10.7 KB, 5 views)
File Type: jpg Offset Intake.jpg (8.3 KB, 7 views)

Last edited by allen standley; 04-15-2016 at 06:14 PM.
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Old 04-15-2016, 07:44 PM
crassius crassius is offline
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Default Re: Motor mount on a 24" bike

built one for customer once - worked OK, but he was disappointed in top speed & we had to redo for smaller sprocket

for something low, I like to build cruisers that have 7 speeds & good brakes
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Old 04-15-2016, 08:27 PM
Soylentbob Soylentbob is offline
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Default Re: Motor mount on a 24" bike

Thanks for all the helpful advice, hopefully this will work out for me with no major issues when I attach the motor.
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Old 04-15-2016, 09:09 PM
Soylentbob Soylentbob is offline
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Default Re: Motor mount on a 24" bike

This is the bike motor I had in mind for my bike.

http://www.ebay.com/itm/Black-80cc-G...BWOW7o&vxp=mtr
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Old 04-16-2016, 11:13 PM
brown brown is offline
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Default Re: Motor mount on a 24" bike

If you cut the rear motor mount cross-ways you can make it thinner and drop the motor in the frame. It will help with head and spark plug clearance. However it will reduce the clearance for the carb. It will increase the likely-hood that you will need and offset intake.

I almost always cut the rear motor mount saddle to lower the motor and the center of gravity. Sometimes if you go to far you will run into clearance issues with the pedal chain drive sprocket. Rarely a problem but worth looking at.

How I cut my saddles is squaring them up iin a vice and then use a cutoff disc in a 4" hand grinder and cut it down to a least half the thickness. You could use a hack saw and a file and have the same results

If you are interested I will post a picture of what I am talking about.
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Old 04-17-2016, 01:13 AM
Soylentbob Soylentbob is offline
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Default Re: Motor mount on a 24" bike

Quote:
Originally Posted by brown View Post
If you cut the rear motor mount cross-ways you can make it thinner and drop the motor in the frame. It will help with head and spark plug clearance. However it will reduce the clearance for the carb. It will increase the likely-hood that you will need and offset intake.

I almost always cut the rear motor mount saddle to lower the motor and the center of gravity. Sometimes if you go to far you will run into clearance issues with the pedal chain drive sprocket. Rarely a problem but worth looking at.

How I cut my saddles is squaring them up iin a vice and then use a cutoff disc in a 4" hand grinder and cut it down to a least half the thickness. You could use a hack saw and a file and have the same results

If you are interested I will post a picture of what I am talking about.
Yes picture would be great thanks.
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Old 04-17-2016, 10:14 AM
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2door 2door is offline
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Default Re: Motor mount on a 24" bike

Here is a little 24" bike I built that required no modifications. Stock intake and carburetor, straight plug cylinder head and it fit perfectly. The engine does look bigger in a 24" frame but that isn't a problem.

Tom
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File Type: jpg 24 Incher, 1.jpg (222.4 KB, 37 views)
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Old 04-18-2016, 09:02 AM
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allen standley allen standley is offline
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Default Re: Motor mount on a 24" bike

Lots of pics of what Brown is talking about in my album "Happy Chains"
http://motorbicycling.com/picture.ph...pictureid=8938
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