40:1 - I looked it up in the operator's manual
I have a Bolens Model BL 150, 31cc and my Operator's Manual calls for a spark plug gap of 0.020 in. (0.5 mm).
The return fuel line is loose or damaged. I have the same issue if you are talking the return fuel line. Here is a site I found a diagram on. http://www.ereplacementparts.com/bolens-bl100-41bd100g965-gas-string-trimmer-parts-c-27272_27749_27758.html
From 1928 to 1939 it was Gilson Bolens and there after became just Bolens
See sonnysbolens.com for free online manual reyour mower.
Harry W. Bolens was born in 1864.
Harry W. Bolens died in 1944.
Bolens Tractors can be bought at a large number of stores throughout the United States. One of the best places to find them for great prices are Lowe's hardware stores.
I am looking it as well. I can't find it.
Find your model number and look for wiring diagram at sonnysbolens.com
how to replace pull wrope on bolens bl110
www.samsbolens.com/parts.html This website seems to have replacement parts for Bolen tractors. If not, they can be able to assist you to find a part for your tractor.