If you disable the upper butterfly, it will run fine with a HUGE loss of power (I tried it). I bought the same carb with the rod that drives the upper butterfly and installed it on a similar Poulan. It worked fine but I had to shorten the rod as it was too long and bumped into another part of the saw.I knew the carb had that extra butterfly and wondered about it, but never thought about it being a strato.
YEAH, I learned something today.
Perhaps a stupid question... is there anything to gained by defeating the upper strato butterfly and forcing it to stay closed?
I thought the same thing.When I first came across a Poulan with that carb, thought it was a two barrel for more power. The more I messed with it the more I learned it was for air only. I covered top port off and noticed it had no power. Also discovered that they tuned different than I was used to. Had to open the needles up more than a normal carb and took a little longer to tune correctly. Now I have no problem setting them.
Steve
And thank you for experimenting and sharing the results of said experiment - so I didn't have to find out the same thing you already knew.You're asking what I learned from experimenting.
Steve
does it idle rich after you've given it full throttle? it's very likely that with typical AS tuning that saw is crazy rich on the high speed. to much fuel left over from the high speed can create a stall or rich idle when it transitions back to the low. ass backwards compared to what those carbs usually do when they need a kit.
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