Engine stumble


Information and questions on GL1200 Goldwings (1984-1987)
  • Sponsored Links
Ultra54
Posts: 3
Joined: Sat Aug 08, 2009 9:00 pm
Location: Ontario Canada
Motorcycle: 1981 Honda GL1100i Interstate

Engine stumble

Postby Ultra54 » Sun Oct 04, 2009 9:47 am



I am the proud owner of a new to me 1986 1200A that is very clean and has 40,000 km on it. The bike had been stored for 2 years by the previous owner WITH fuel stablizer in it and the fuel petcock turned to on. After replacing the battery with a brand new unit I took it for a test ride. It started right up fine and idled at around 900 rpm. There was a fair bit of smoke, which I assume is normal, that cleared after the bike was warmed. Off I went and was impressed with the throttle response compared to my 1980 GL1100i. As the road opened up I rolled it on pretty hard to see what it had. Under load,4000 rpm, full throttle, slight incline, the bike falls on its' face essentially. The motor changes characteristics as in the sound is rough, almost a fluttering and the acceleration is subdued. It isn't necessarily an rpm issue as much as it's a throttle position issue. What I mean is that when the curcuit beyond half throttle is called upon there appears to be an issue. So after the ride we replaced most of the fuel , plugs and fuel filter and tried it again with the same results. I made a lower offer than was initially agreed upon and the bike was mine. I've certainly had experience with these wings and consider them very reliable and felt confident I can straighten it out. My 1100 had some major issues when I bought it and after taking the carbs off and cleaning the hell out of them it runs fine.
I'm looking if anyone can point me in a specific direction as I find it hard to imagine that the needle jet/ mains are plugged. Bad fuel/ gumming usually affects the low speed/ idle circuit in my experience as these passages are so tiny. Any help would be appreciated. I'm hoping I won't have to remove the carb bank and actually I have added half a can of Seafoam which hasn't done a damn thing.



CapnDenny1
Posts: 64
Joined: Thu Aug 27, 2009 4:48 pm
Location: OFallon, MO
Motorcycle: 1982 GL1100

Re: Engine stumble

Postby CapnDenny1 » Sun Oct 04, 2009 11:09 am

What about the spark plugs? Or an ignition issue. I know in a car if you have bad spark plugs it really shows under full throttle. The other would be a fuel flow issue. At higher throttle setting you are asking for more fuel. If it can't deliver it won't have more power. I had a truck once that had crap in the fuel line and it all collected at a place where it made a 90 degree bend. All the junk collected there. It ran fine except when you tried to climb a hill, then it would almost die.

Ultra54
Posts: 3
Joined: Sat Aug 08, 2009 9:00 pm
Location: Ontario Canada
Motorcycle: 1981 Honda GL1100i Interstate

Re: Engine stumble

Postby Ultra54 » Sun Oct 04, 2009 4:09 pm

Drained the fuel, changed the plugs and fuel filter with no difference.It runs perfectly from 0 - half throttle and actually you could live with it that way but I won't.. :lol:.

User avatar
WingAdmin
Site Admin
Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Engine stumble

Postby WingAdmin » Sun Oct 04, 2009 10:49 pm

Before attempting to consider doing anything mechanical, you might want to first run a can of Seafoam through it. Dump 1/2 to 3/4 can of Seafoam into a full tank of gas, and then go out and burn up that tank.

If the problem is simply clogged ports or jets in the carbs that can't supply larger amounts of fuel at higher throttle settings, there's a fair chance Seafoam will clear it out and take care of the problem.

User avatar
SCSDK
Posts: 17
Joined: Sun Aug 16, 2009 2:26 am
Location: Denmark
Motorcycle: 1985 GL 1200 Interstate

Re: Engine stumble

Postby SCSDK » Tue Oct 06, 2009 3:19 am

Hi,
one more thing that might influence high-end performance is the alternator/stator, check the voltage output at high rpm's
Søren
GW 1200 Interstate

Ultra54
Posts: 3
Joined: Sat Aug 08, 2009 9:00 pm
Location: Ontario Canada
Motorcycle: 1981 Honda GL1100i Interstate

Re: Engine stumble

Postby Ultra54 » Tue Oct 06, 2009 3:46 pm

Ya, thats swell, another variable to track down.... :lol: .

User avatar
eklimek
Posts: 307
Joined: Tue Feb 15, 2011 1:55 pm
Location: St Catharines Ontario Canada
Motorcycle: 81 GL1100 (Widowmaker not in service), 83GL1100, CB350f x 6, CB400f x2, CB550f sold, CL350 (seized engine), plus enough donors to take me through retirement.

Re: Engine stumble

Postby eklimek » Sun Jun 05, 2011 8:30 am

Did you ever solve this problem? I have an 81 1000 with something similar.




Return to “GL1200 Information & Questions”




Who is online

Users browsing this forum: Yahoo Slurp [Bot] and 3 guests