The fifth step is to rebuild the engine. This requires special tools and special skills. If you don t know how to take the engine apart much more to rebuild it, you may want to leave it to the professionals to do this part for you. During the engine rebuild, there is a chance that you may need to find replacement parts for it. After you remove the parts from the motorcycle frame, the next step is the cleaning process. This means that you need to reduce the frame of the bike in to bare metal. The easiest way to do this is to have the frame dipped in acid. This will remove rust, dust, and other foreign materials. By doing this, you will be able to get a better look at the overall condition of the frame. You need to keep in mind that you have to document everything that you do. Before you begin the strip down process, you may want to take detailed pictures of the motorcycle you are trying to restore. This way, you will be able to have reference when the time comes to put everything back together again. Now, what if you have a 1950 s model motorcycle? For sure, you will have a very hard time finding the spare parts you need in order for you to restore this kind of motorcycle. In fact, some parts are so rare that some people who restores motorcycle for a living or die hard motorcycle fanatics who is trying to restore their dream bike travels half way around the world just to look for parts. It is important that you check all the parts as you take them off and make notes about it. During this process, you will be checking the parts on what needs to be repaired, cleaned, or completely replaced. You also need to know if there are parts missing from the bike. Next, you should look through old photos and publications that feature the motorcycle you are restoring. This way, you will be able to know which part needs cleaning, repair, or replacement. The pictures will serve as a reference for you and it will also help you determine how to put everything back together again. Now that you organized the parts for your motorcycle and you listed down which part needs replacement, the next step is to get the parts, right?