(DIR) Return Create A Forum - Home --------------------------------------------------------- Chainsaw Repair (HTM) https://chainsawrepair.createaforum.com --------------------------------------------------------- ***************************************************** (DIR) Return to: Poulan ***************************************************** #Post#: 90659-------------------------------------------------- Poulan 4000 3700 3400 bore stroke By: Chainsawrepair Date: June 6, 2024, 8:39 am --------------------------------------------------------- Just saving old info to it's on thread so not buried. Using these numbers I come up with this. All close enough to give folks real cc. 4000 49.2mm 33.5mm 63.69cc 3700 47.7mm 33.5mm 59.86cc 3400 46mm 33.5mm 55.67cc Then Tim's info again. Here are the actual displacement numbers in that series for the heck of it. The stock stroke was measured by a machinist that made a stroker crank for a 3400. Poulan 3400, 4000 saw stroke is 1.319" (33.5mm) and displacement Volume of a cylinder V=πr2h (volume = pi X (radius squared) X height (stroke) 3400 3.14159 X (1.81/2 )squared X 1.319 = 55.614 cc 3700 59.681 cc 3800 59.9999 cc 4000 63.562cc *****************************************************