Johnson model MQ-13B What does the B mean?

F_R

Honorary Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
A very often asked question. The trailing letter signifies any mid-year changes that were made-----IF any changes were made. Otherwise it means nothing. The parts book will reveal the changes, if there were any.
 

racerone

Honorary Supreme Mariner
Joined
Dec 28, 2013
Messages
39,986
Nothing really.------MQ10 was the first year of production in 1964.----Yours is a 67 model.----The B might indicate a minor mid year change if there was one.-----Best to ignore the B at this time.------How is your motor running ?
 

Bream Killer

Seaman Apprentice
Thread starter
Joined
May 1, 2020
Messages
37
Nothing really.------MQ10 was the first year of production in 1964.----Yours is a 67 model.----The B might indicate a minor mid year change if there was one.-----Best to ignore the B at this time.------How is your motor running ?

I rebuilt the carb and it runs great except no water so I am about to rebuild the lower gear case and water impeller. I was trying to get a gasket set and there were two different sets in the parts section.
 

Bream Killer

Seaman Apprentice
Thread starter
Joined
May 1, 2020
Messages
37
One thing I have had trouble with over the years is the fuel nipple. I have a drip there and I have changed fuel connectors till I am tired. They go on fine but will back off about an 1/8" and drip. Any ideas?
 

racerone

Honorary Supreme Mariner
Joined
Dec 28, 2013
Messages
39,986
There was a change made in the propshaft oil seal.----So take yours apart and see what oil seal is on yours.---I can not see what parts are on your motor now.----My chrystal ball battery is low and needs recharging..---Sorry.
 

kbait

Commander
Joined
Nov 13, 2007
Messages
2,487
Hose connection on back side of engine fuel coupler?
 

F_R

Honorary Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
OK, as it turns out, the "B" signifies a mid-year change was made in the prop shaft seal. I don't have the oem parts list, so I don't know if B means the one before or after the change.
 
Top