1976 gl 1000 low power


Information and questions on GL1000 Goldwings (1975-1979)
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ajratt01
Posts: 15
Joined: Wed Apr 14, 2010 6:50 pm
Location: buckley,ill
Motorcycle: 1976 gl 1000

1976 gl 1000 low power

Postby ajratt01 » Wed Apr 14, 2010 6:56 pm



i just bought a 1976 gl 1000. its a nice bike, but runs kind of rough at idle. this may still be bad fuel as it sat for awhile. my main problem is that it runs great when first started, then after about 4 or 5 miles it seems to loose power. it almost seems like it's dropping a cylinder. any help will great as i would like to fix this myself.



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WingAdmin
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Re: 1976 gl 1000 low power

Postby WingAdmin » Wed Apr 14, 2010 6:57 pm

How long since you changed your fuel filter?

ajratt01
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Joined: Wed Apr 14, 2010 6:50 pm
Location: buckley,ill
Motorcycle: 1976 gl 1000

Re: 1976 gl 1000 low power

Postby ajratt01 » Wed Apr 14, 2010 8:42 pm

checked it and it seems ok. a friend thinks it is points? i am getting a new fuel filter and have added seafoam to the fuel, seemed to help some. like i said has kind of a rough idle but revs up ok. idles ok, runs fine for about 5 miles then drops off.

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thrasherg
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Motorcycle: 2004 GL1800, 2005 Honda Shadow 750, 2008 Yamaha R6 with RG500 engine, CRF450X, CRF230, CRF250X, XR200, CR500

Re: 1976 gl 1000 low power

Postby thrasherg » Thu Apr 15, 2010 7:18 am

Is the gas tank breather blocked? If air can't get in then fuel can't get out and it would take about 5 miles for a vaccum to form? The obvious check is ride the bike until power drops off, then open the filler cap to let air in and see if the power comes back. If it does then you have a breather blockage that you need to find, if nothing changes after you open the filler cap then it's not a breather issue.

Gary

TKM
Posts: 66
Joined: Mon Jul 27, 2009 5:57 pm
Location: Brockville Ontario
Motorcycle: 1976-GL 1000-
1978 GL 1000-rolling frame
1979 GL 1000-
1982 GL 1100A-
1999 Valkyrie
1974 TR6

Re: 1976 gl 1000 low power

Postby TKM » Sat Apr 24, 2010 6:33 pm

Hey
get rid of the old gas, give a good look at your gas tank for rust , if no rust change out the fuel filter fresh gas , a lot of people use sea foam to clean the carbs while riding
A lot of damage is done with old gas and rusty tanks

ajratt01
Posts: 15
Joined: Wed Apr 14, 2010 6:50 pm
Location: buckley,ill
Motorcycle: 1976 gl 1000

Re: 1976 gl 1000 low power

Postby ajratt01 » Tue Jun 01, 2010 10:01 pm

ok new update have changed coils, points, set valves ,carb synch,plugs, and new fuel. is better but still not right. has a rough idle bad hesitation, andpops back thru the exhaust when idling. please somebody help me. i'm out of ideas. thanks

TKM
Posts: 66
Joined: Mon Jul 27, 2009 5:57 pm
Location: Brockville Ontario
Motorcycle: 1976-GL 1000-
1978 GL 1000-rolling frame
1979 GL 1000-
1982 GL 1100A-
1999 Valkyrie
1974 TR6

Re: 1976 gl 1000 low power

Postby TKM » Wed Jun 02, 2010 7:02 am

Hey
you have been busy , when you sync the carbs did anyone touch the pilot screws , on a 76 they are required to be two full turns out ( feather them all the way in , do not put pressure on them ,when you feel them lightly seat then back them out two full turns ) Have you have tracked down a manual ?
You have not mentioned what your plugs look like ! have you changed them ?
In a well ventilated area with the bike running spray some carb cleaner or equivalent around where the runners attach to the block and carbs any change in RPM indicates a vacuum leak
When i start a new found bike i always clean the gas tank & carbs , sounds like you are confident that it is clean , and you have a new filter (rust will travel through the filter and contaminate carbs ) Some people use sea foam in the gas tank , i use MMO triple dose as a spring tonic, i read about a guy who swears a pint of ATF will do the job
You said you were running the bike with old gas, try the cleaners of your choice for a couple of tanks and see if there are any improvements . These are the easy things that i try first
If not , you may be looking at pulling the carbs , we all hate that !

ajratt01
Posts: 15
Joined: Wed Apr 14, 2010 6:50 pm
Location: buckley,ill
Motorcycle: 1976 gl 1000

Re: 1976 gl 1000 low power

Postby ajratt01 » Thu Jun 03, 2010 3:33 pm

thanks for getting back so kwik. a little more stuff i have stumbled across. the plugs have been changed, tank is clean. when the carbs were synced i'm not sure about the pilot screws. i have another guy helping that tinkers with bikes so it's a joint effort. what i found last nite is , i have an laser type temp gun. with the bike almost at full temp i checked exhaust pipe temps. right side of bike which i think is 1 & 3 temps were about 120 to 125 both pipes. on the left side 2 & 4, rear pipe was 120 to 125 close to right side, but the left front pipe was only 90 to94 degrees. think i have narrowed it down at least to a cyl. still not sure what is going on but were thinking fuel, such as carb. oh yea compression is also good all across the board . ok again all ideas welcome. thanks everybody.

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thrasherg
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Re: 1976 gl 1000 low power

Postby thrasherg » Thu Jun 03, 2010 4:34 pm

I would suspect a carb still, the ignition must be working otherwise you would have 2 cylinders not working (One coil feeds 2 cylinders), you have compression, so fuel is the only thing missing. Sounds like you need to remove the carbs on the cold cylinder and clean it..

Gary

TKM
Posts: 66
Joined: Mon Jul 27, 2009 5:57 pm
Location: Brockville Ontario
Motorcycle: 1976-GL 1000-
1978 GL 1000-rolling frame
1979 GL 1000-
1982 GL 1100A-
1999 Valkyrie
1974 TR6

Re: 1976 gl 1000 low power

Postby TKM » Thu Jun 03, 2010 5:59 pm

we must believe the electrical is complete
clean tank & filter
losing power after a 4-5 miles--check the gas cap do you hear a rush of air when you undo the cap--when you are riding and lose power loosen the cap off and try that
Pilot screws control idling and mixture
popping in the exhaust i believe indicates a lean condition--plugs should confirm -assuming you have a good spark on the low temp cylinder (cracked plug , cracked wire ,poor connection ) switch the plugs around
is it popping from the same side as the low temp ?
Try a gas treatment , it it doesn't work you may be in for a carb pull down
Have you sourced a manual ?

ajratt01
Posts: 15
Joined: Wed Apr 14, 2010 6:50 pm
Location: buckley,ill
Motorcycle: 1976 gl 1000

Re: 1976 gl 1000 low power

Postby ajratt01 » Thu Jun 03, 2010 8:31 pm

been down the path of 2 cyls down. couldn't get second set of points to time in so replaced both sets all is good now . ignition system should be covered. the popping does seem to be coming from the same side as the cold cly. plugs are new and fuel treatment and new gas has been run thru. so it looks like carbs. i'll let you guys know. thanks again for all the help.

maddogcycle
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Re: 1976 gl 1000 low power

Postby maddogcycle » Wed Jun 09, 2010 9:17 pm

The low speed circuit on your carbs are plunged this is the popping. let the engine worm up and take a spray bottle with water in it and spray the pipes just as they came out of the cylinder head. If the water instantly turns to steam this cylinder is firing. No steam the cylinder is not firing. Take a timing light and check to make sure the plug is firing,if so you have a fuel delivery problem. Carbs need to be cleaned.HAVE THIS DONE BY SOME ONE THAT KNOWS WHAT THEY ARE DOING NOT YOUR BUDDY THAT THINKS HE CAN DO IT!!!!! ALL CARBURETORS REQUIRE AN EXPERT TO DO THEM RIGHT.

ajratt01
Posts: 15
Joined: Wed Apr 14, 2010 6:50 pm
Location: buckley,ill
Motorcycle: 1976 gl 1000

Re: 1976 gl 1000 low power

Postby ajratt01 » Mon Aug 02, 2010 3:41 pm

hey guys been awhile and a struggle, but i came out ahead. seems the overall problem with dropping a cylinder was the carbs, no big surprise. went thru them ran down the road like a champ, but had the bad idle and popping at idle. found this problem myself and fixed it. seems we created our own problem when we changed the coils in the beginning with an ebay set. huge mistake!the guy i had looking at it thought they could be the prob. (the original set that is). so he changed them with the ebay set. after all was said and done and half a summer riding season gone i tried to convince him to put the old set back on . i used to be an auto tech and wasn't to bad at it, and it just seemed alot of this started after the change. he said they couldn't cause a bad idle and popping back and was lost. long story short i got tired of screwing with him changed them back to original and bam runs like a dream. what i learned? two things, always go with your gut feeling, and then overhual the carbs. hope all this helps someone down the road. thanks again for all your help. al

goldtr6c
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1976 GL1000 "800lb Canary"

Re: 1976 gl 1000 low power

Postby goldtr6c » Mon Aug 02, 2010 6:39 pm

You changed the primary filter, thats good. However there are four more filters to contend with. Under each float needle seat, there is a filter screen that will catch most of the superfine rust that made it past the primary filter. The only way to clean them is to pull the carb rack. These are reusable but take care as the only source I know for these is to buy float seat set from Honda. Can't get them seperately.




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