Carburetor adjustment tool for Ryobi String Trimmer

thingiverse

Warning: Work-in-Progress thing. Many Ryobi gas-powered string trimmers experience a common issue after several years of use, causing them to bog down at part throttle and die at full throttle. This condition is easily repaired by adjusting the carburetor. Unfortunately, in the US, these units are required by law to be fitted with tamper-resistant carb mixture screws. Thousands of perfectly good tools end up in landfills and scrapyards every year due to environmental concerns. A rant about this issue can be inserted here. Special screwdrivers that fit tamper-resistant screws are available from many sellers on eBay. This DIY alternative is a cost-effective solution for Ryobi and Homelite 2-stroke and 4-stroke engines. The tool has undergone several changes based on destructive testing to improve its performance. Version 2 includes modifications such as thinning the body, sharpening the pip, extruding the handle into the shaft, and shortening the handle to enhance strength and fit. Version 3 adds a pointer arrow on the handle for easier use. This part is extremely weak when printed with layer transitions aligned. It performs better when transitions are randomly distributed or in vase mode. Note that this tool may not fit all carburetors. If it doesn't fit yours, please let me know and I can make adjustments to accommodate your specific needs.