After mowing the lawn once since the mower rebuild the thing started running absolutely horrible. The motor was revving up and down over and over and I just could not get it to stop. Every time I would get it to stop hunting it would just start hunting again. I searched the Internet and I couldn’t find any information that was useful. I couldn’t seem to figure it out for the life of me but one thing I did notice was that no amount of carburetor adjustment made any difference. This spoke volumes to me and since I already had the carb rebuild kit on hand I decided (although I didn’t want to yet) rebuild the carby. I ripped into the old carb and I have to admit it was quite fun working on one of these small carburetors at first. Then I noticed the new kit came with a brand new float needle seat. That’s right, not just the float needle but the copper plug that it seats into as well. So I immediately
The Craftsman lawnmower I purchased this summer is nearly finished and running absolutely great. I still need to finish the seat and get all the vinyl cut for the Craftsman logo’s as well as the dash information. Next summer I will start the process of converting the lawnmower to EFI and possibly electronic ignition as well. I am not 100% sure as to what will be controller the lawnmower but it will likely need to be something a little more powerful than an Arduino. Even the Arduino Mega will likely not have the processing power or memory storage needed for the project but it should work out to be a great proof of concept and learning tool. Check out the lawnmower and build progress in the Automotive section.
I found these 2 PDF’s on the internet while searching for more information on my 18 HP B&S motor. The first document is an Illustrated parts list for Briggs & Stratton Model Series 422700 Type numbers 1105 – 4822. The second document will show you how to read the model number / VIN number of your Briggs & Stratton motor so you will know which motor will directly replace your motor. Its easier to find an engine that will fit than it is to find the exact same model engine if you need to change the engine for any reason. The screenshot to the right shows a preview of the Briggs & Stratton Model Number Designations, This is a great document for help with Briggs & Stratton engine decoding. Some people may also refer to this document as a Briggs & Stratton Model Decoder. Note: The PDF file is higher quality than the sample image to the right.