if the serial number ends in n or x
Made by Remington in 1985 &1986; 28" or 30" vented rib barrel with various chokes; basicly same gun as the 870 Express model; most if not all 870 parts are interchangable. Should probably hold value comparable to the Remington 870 Express model which retails close to $400.00 after taxes.
It is chain drive.
under the gas tank
The Remington Model 12 Sportsman came in semi-auto or pump configurations, and were made from 1984-1986 (vintage?). The auto is booked at $300 in 100% condition and $150 in 60%. The pump from $275 to 140. (Add 10% if it has Rem-chokes).
The first year that the Rem Choke or screw in choke on Remington shotguns was 1986. It made the already famous Remington 870 even more popular.
Between 155 to 160 mph
Check the fuel pump relay.
41 mm.
behind the left side passenger footpeg
1986 from the G in the serial number.
http://www.shadowriders.org/pictures/Picts/86forward.html