Poulan was able to sell units that did not meet emissions standards for anumber of years because they had enough models that did meet the standard so that the EPA would issue them credits to sell those products only not in the state of California which has it's own set of emission standards. In 1985 ANSI released a standard that if companies wanting to wear the UL label would have to adhere to it was ANSI B175.1 1985 and it was a safety standard for occasional users, noise output, kickback, vibration analysis etc.. That would probably mean that alot of muffler configurations that would not meet sound standards would be used up and some of those old saws were so unwieldy and unbalanced that they could not meet some of these standards. Kicback testing was a bear and long bars, bow bars etc could only be used on pro saws that did not fall under the guidelines of this standard but if a product could not meet the specifications for what was considered a "pro" saw then it fell under these guidelines. I believe that one of the criteria was for durability testing for min. 300 hours without major mechanical failure. Can you see where the dilemma started coming in with production of the pro line? Another one of the problems with these saws was the USDA standard for muffler exhaust gasses. Which states that at a plane of contact with the engine running at optimum performance on a dyno and with the contact plane specified by a wire frame there can be no point on that plane to exceed a temp of 480 degrees. That does away with all front exhaust mufflers and let the detuning begin. no more can you just build a hoss and throw it out there and watch the chips fly. Sweden and the US government were responsible for alot of what went on back then and the demise of some good old saws.
I was in the production machining department in 1991 when we ran our last batch of 1000 midsize crankcases for service.
ron
Great info Ron. I have another question about the S25 and 3700 and 4000. These saws were later re-painted and sold as the PP versions (PPS25, Farm Pro 375 and 395). What were the changes if any made the the green saws to meet the "pro" standards?
Thanks for the great info!