That mower has a F model motor.

 

Model 5127 was made 1987 and 1988. As stated above, this has the F series motor. Here are the specs. Bill

Model Number 5127
Model Year 1988
Beginning Serial # G00000001
Ending Serial # G99999999
Product Name Lawnmower
Product Brand Lawn-Boy
Product Type Walk Behind Mowers
Product Series 20" Steel Deck
Chassis Type Steel Deck WPM
Swath 20 inch
Discharge Side
Safety System Pre-Compliance
Engine/Motor Manufacturer Lawn-Boy
Engine/Motor Model # F
Engine/Motor Type 2 Cycle
Engine Starter Recoil
Transmission Manufacturer NA
Transmission Model # NA
Transmission Speed NA
Transmission Type Hand Push

 

Excellent forum !!

Thanks for the replies and extra info. I've been browsing the other sections of this site and I'm sure this is the best one covering the subject of lawn mowers so completely !
cheers cooter :2th: