Specs for hindered 621
A local Jonsered Chainsaw dealer can be found by searching for locations on the official Jonsered Chainsaw website. They will give you the address of the closest dealer.
its 40:1. Check the specs for this saw at: http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/801048d6175e831988256b6b00189180?OpenDocument
49cc
jonsered oil/gas mixture ratio is 50 to 1.
1986 to 1993
Not so sure it is. The manual shows none. If it suffers from reduced flow, the oil pickup may need to be checked for clogging. See link to manual, now a part of Husqvarna.
Started production in 1979. Not sure how long they were produced. Made in Sweden.
45.6 cc
51.4cc
The 451 is a 25:1 mix or 5.12 oz of oil to a gal of gas.
Partstree, Lowes, and eBay