Knocking under load


Information and questions on GL1100 Goldwings (1980-1983)
Post Reply
Chitownjohnny
Posts: 31
Joined: Sun May 19, 2019 1:01 pm
Location: Montello, WI
Motorcycle: 1981 GL1100

Knocking under load

Post by Chitownjohnny »



81 Gl 1100 has what sounds like a rod knock under load. 1st and 2nd no noise but once in 3 and I hit 4500 rpm it starts making a low knocking noise. It was running fine now this. Carbs were rebuilt in August and bike was winterized and was running well. I have been told the carbs can be out of sync is there anything else that it may be.


User avatar
DenverWinger
Posts: 1940
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Knocking under load

Post by DenverWinger »

Doubtful it is Carburetor sync, that mainly affects the cylinder balance at idle and very light throttle. Once the throttles are opened to any degree the sync adjustment is insignificant.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
User avatar
Lucky07
Posts: 53
Joined: Sun Mar 03, 2019 11:21 am
Location: Ottawa, ON Canada
Motorcycle: 1983 GL1100A Aspencade
1984 CB550SC (Sold it :( )

Re: Knocking under load

Post by Lucky07 »

Pull the plugs and see what they look like. If it's a combustion issue you should see it there, might have a cylinder running lean/heavy or with weak spark. If all plugs are the exact same I'd be leaning towards something mechanical (not so good) but easiest first would be checking the plugs.
Post Reply