1500 losing speed
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in2it
- Posts: 281
- Joined: Sun Oct 06, 2019 6:09 am
- Location: Waldo,Arkansas
- Motorcycle: 2000 GL 1500 Aspencade
1982 GL1100 (SOLD)
1980 GL1100 Bobber with Vance and Hines Mufflers (SOLD)
Past Rides in my youth
1965 Honda C102 50cc OHV Engine with 3spd Auto-Clutch
1972 CB 350
1975 CB 550 4 with Dunstall headers and mufflers
1978 GL 1000
1500 losing speed
What would cause power lost on a 1500 ... if your doing 70 ... and go up a hill ... speed will drop to 50 with the throttle wide open... has anyone experience this ???
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DenverWinger
- Posts: 2441
- Joined: Thu Jun 23, 2011 2:20 pm
- Location: Denver, CO
- Motorcycle: (s)
'80 GL1100 STD Vetter (2005-)
'93 GL1500 Aspencade (2017-)
'83 Trav-Lite Camper (2010-)
Past rides
'72 CL350 (1980-1988) sold
'78 Suzuki GS550 (1985-2005) sold
'77 GL1000 (2002-2006) sold
Re: 1500 losing speed
Plugged fuel filter? Weak fuel pump?
A local inventor has figured a way to turn a sausage grinder backward to manufacture pigs. 
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫
♫ Take one down, Patch it around, ♪
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♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪
~Mark
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in2it
- Posts: 281
- Joined: Sun Oct 06, 2019 6:09 am
- Location: Waldo,Arkansas
- Motorcycle: 2000 GL 1500 Aspencade
1982 GL1100 (SOLD)
1980 GL1100 Bobber with Vance and Hines Mufflers (SOLD)
Past Rides in my youth
1965 Honda C102 50cc OHV Engine with 3spd Auto-Clutch
1972 CB 350
1975 CB 550 4 with Dunstall headers and mufflers
1978 GL 1000
Re: 1500 losing speed
Has a new fuel filter... and a new after market fuel pump .... Im at wits end .... with a good pump ... would you know how long it would take to fill a gallon jug or how to judge a weak fuel pump ???
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Rambozo
- Posts: 2888
- Joined: Sun Apr 01, 2018 8:36 pm
- Location: Disneyland
- Motorcycle: 1992 GL1500 Aspencade
Ducati Monster
Re: 1500 losing speed
There is a spec and test in the service manual.
You can also drive around with a fuel pressure gauge to see if you can't maintain pressure.
Last edited by Rambozo on Tue Feb 07, 2023 6:37 pm, edited 1 time in total.
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ct1500
- Posts: 1577
- Joined: Wed Nov 10, 2010 8:09 pm
- Location: Glastonbury,CT
- Motorcycle: 1988 GL1500
- Contact:
Re: 1500 losing speed
It is then likely a defective auto petcock or loss of vacuum to it which will limit fuel flow.
Local and need repair help with your 1500, Valkyrie or ST please click contact
Nothing leaves my shop till its' perfect
This is what I do
Nothing leaves my shop till its' perfect
This is what I do
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in2it
- Posts: 281
- Joined: Sun Oct 06, 2019 6:09 am
- Location: Waldo,Arkansas
- Motorcycle: 2000 GL 1500 Aspencade
1982 GL1100 (SOLD)
1980 GL1100 Bobber with Vance and Hines Mufflers (SOLD)
Past Rides in my youth
1965 Honda C102 50cc OHV Engine with 3spd Auto-Clutch
1972 CB 350
1975 CB 550 4 with Dunstall headers and mufflers
1978 GL 1000
Re: 1500 losing speed
I had time to go through the suggestions I got from members .. and tested all of them... was looking at the fuel lines and saw where a fuel hose had a 90 degrees pinch... when redoing the fuel lines made one a little to long... shorten the line and... BINGO... all is good ... want to thank everyone who offered suggestions .. they were all good ... so the winter project is over ... again.... thanks to all
