A fork oil level tool is essential if you ever decide to perform a fork oil change / maintenance. It takes the guess work out of the proper oil level height inside your forks.
There are commercially made ones that cost between $20-40 and can be purchased from any motorcycle shop or online vendor.
I decided to make my own out of a few spare parts I had on hand for under $4.00.
You will need the following parts for the project:
DIY - Fork Oil Level Tool
Qty | Description | 1. | Syringe 
I had a few spare ones on hand that I had purchased from a Dollar store. | 2. | Metal tube, about 12 inches long
I picked one up at a hardware store for $1.00. 1/8th inch metal tube seems to work well. | 3. | Large metal washer.
It should be equal to or larger than the diameter of your fork slider. I got one for 40 cents. | 4. | One foot of clear plastic tubing.
I find that ⅛ inch works best. I bought a foor for 29 cents. | 5. | Drill stop insert. 
Choose one that fits the diameter of your metal tube. They cost about $1-2.00 at most hardware stores. |
Perform the following to assemble the oil level tool:
Step | Description | 1. | Measure the diameter of your metal tube and drill a hole in the middle of the the washer. Avoid making the hole larger than it needs to be.
| 2. | Measure and mark the recommended oil level height for the fork, 129 mm for the OEM Burgman 650. I use the same tool for multiple bikes and simply measure and remark the height level for each bike.
| 3. | Insert the metal tube through the drilled hole in the washer, and line up the measured mark with the bottom of the washer.
| 4. | Insert the drill bit stopper over the metal tube on the opposite side of the washer and tighten it against the metal tube. Verify to make sure that the height level mark is flush with the bottom of the washer.
 
| 5. | Complete the assembly by connecting the clear tube to the syringe and the upper end of the of the metal tube.
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