Motorized Bicycle Repair

Written by: roboguru

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I got into a bicycle accident recently and badly damaged my motorized bicycle. What happened was I riding at night and struck an unmarked road island (which was new construction). I was thrown from the bike and landed on my left shoulder breaking my collar bone. I was rushed to the hospital and x-rays made sure nothing else was broken. Thankfully I was wearing a helmet other wise I would have had a cracked skull and a severe concussion. PLEASE! Wear a helmet when riding any kind of bicycle it saved my life.

Step 1: Damaged Bicycle

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After the accident you want inspect the frame, rims, moving parts, and other parts for damage. The front rim is ruined and the carburetor insulator assembly. To get things rolling I took note of the damaged engine parts and ordered them for my Honda here at eReplacementParts. The down side is it will take about a two month to be delivered but I'm in no hurry with a a broken collar bone. I have a replacement rim and a replacement tube sitting in the back yard...........some where.

Step 2: Repairing the Engine

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Start by disconnecting anything that connects to the carburetor assembly like the fuel lines and throttle linkage. Then unscrew the bolts in the air cleaner and remove the air cleaner and carburetor. Then, disconnect the spark plug, unbolt the cover, and remove cover. Be sure to set the cover aside where it wont get stepped on. Next remove the air inlet guide cover (the metal plate) by removing the philips head bolt. Lastly remove the carburetor insulator (the black thing which in my case is broken).

Step 3: Putting the New Parts On

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If the gasket material stuck to the metal like me, scrap it away with a plastic tool only. Do not use a razor blade as it will gouge the aluminum ruining the surface. Once clean, use rubbing alcohol to remove oils from the gasket surface. Install all the parts and gaskets. Then put the gaskets on and put everything back together. Lastly prime the engine and test it out. In my case the engine started right up. If it didn't start for you check the spark plug, check the to see if there is fuel, and unrestricted air flow (including the choke).

Step 4: Replacing the Rim

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Take the damaged rim off and replace it with a new one. Then inspect the tire and replace it if there are rips, tears, and bulging. Mine didn't show any damage so I reused it but my inter tube was shot and was replaced.

Step 5: Inspect for Frame Damage

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Check that everything is okay with the frame and front fork. Check for cracked welds and signs of a bent frame. Make sure the fork is not bent and moves freely. Everything looks good no visible cracks but I will monitor the welds before every ride.

Step 6: Take It For a Test Ride

I took the bike for a test ride and have found the head tube bearings are damaged and need replacing. Inspect for any other things that are out of place or feel different. Check and recheck welds and other parts of the frame for cracks after the test ride.

After the test ride the head tube was rather stiff after looking at the races in the head tube I saw the reason. The bearings left an impression on the race. To temporary fix the problem I loosened the head tube and re-greased the bearings. Then went on another test ride and filmed it.