1200 wont start


Information and questions on GL1200 Goldwings (1984-1987)
Post Reply
crackercap
Posts: 23
Joined: Sun Mar 24, 2013 11:28 am
Location: waynesboro, VA
Motorcycle: 2007 Honda GoldWing 1800

1200 wont start

Post by crackercap »



Recently I picked up a 86 Honda Interstate that had not been run since 06. The bike was stored inside but the gas was not drained and the fuel as well as carbs were gummed up. I removed the carbs, cleaned them and installed new kits. They were not as bad as I anticipated only one showed heavy deposits. Upon installation(I did not remove gas tank yet) I ran a fuel line from a gas can to fuel pump and attempted to start. It shows good spark to each plug, has adequate compression, and the engine turns over strong. It fires intermittingly but will not start. I loosened each carbs drain plug and fuel is in carbs. It is hard to get starting fluid to carb due to the way the bike is designed, I did remove air cleaner assembly again and am able to get some starting fluid to carbs but not much. It will run poorly for about 2-3 seconds but will not pick up on its own. Any help here would be appreciated.



User avatar
OldZX11Rider
Posts: 1207
Joined: Mon Nov 09, 2015 9:25 am
Location: Garfield, Arkansas
Motorcycle: 1994 Honda GL1500 Goldwing SE

Re: 1200 wont start

Post by OldZX11Rider »

I can't remember how the 1200's fuel system is laid out but since you're running fuel from a can, is there a place you can bypass the pump, filter and petcock and gravity feed fuel to your carbs?
If it would run that way, you would narrow down where the problem lays.
Like I said, I don't remember how the 1200 fuel system is laid out.
For he is the minister of God to thee for good. But if thou do that which is evil, be afraid; for he beareth not the sword in vain:

crackercap
Posts: 23
Joined: Sun Mar 24, 2013 11:28 am
Location: waynesboro, VA
Motorcycle: 2007 Honda GoldWing 1800

Re: 1200 wont start

Post by crackercap »

Its my understanding that just a gravity feed is inadequate and the fuel pump is necessary to get proper fuel pressure.

User avatar
WingAdmin
Site Admin
Posts: 21286
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer

Re: 1200 wont start

Post by WingAdmin »

crackercap wrote:Its my understanding that just a gravity feed is inadequate and the fuel pump is necessary to get proper fuel pressure.
It's not a fuel injection system, it does not require fuel pressure. All the pressure you need is enough to get fuel through the filter and draining into the carburetor float bowls. And gravity provides enough pressure to do that.

User avatar
OldZX11Rider
Posts: 1207
Joined: Mon Nov 09, 2015 9:25 am
Location: Garfield, Arkansas
Motorcycle: 1994 Honda GL1500 Goldwing SE

Re: 1200 wont start

Post by OldZX11Rider »

I was also wondering, since it had sat for so long, have you changed the timing belts?
And if you did that, since it does try to run at times, could the timing be off by just a little bit?
I'm just trying to think of things that might help a bit. I'm not a motorcycle mechanic.
For he is the minister of God to thee for good. But if thou do that which is evil, be afraid; for he beareth not the sword in vain:

User avatar
RoadRogue
Posts: 2069
Joined: Sun Jun 06, 2010 10:51 pm
Location: southern Okanogan BC, Canada
Motorcycle: 1997 1500SE

Re: 1200 wont start

Post by RoadRogue »

It sounds to me like the jets are still plugged up in the carbs. Old,dried fuel from sitting will completely plug these small passages. Just blowing air through them isnt enough you usually have to remove them,and run a wire through, soaking in Seafoam helps loosen the crud. 8-)
Ride safe, Todd
Over night campers welcome

crackercap
Posts: 23
Joined: Sun Mar 24, 2013 11:28 am
Location: waynesboro, VA
Motorcycle: 2007 Honda GoldWing 1800

Re: 1200 wont start

Post by crackercap »

If gravity feed is sufficient for gas to get to carbs, then why does the system have a fuel pump as the 1200 does.

User avatar
WingAdmin
Site Admin
Posts: 21286
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer

Re: 1200 wont start

Post by WingAdmin »

crackercap wrote:If gravity feed is sufficient for gas to get to carbs, then why does the system have a fuel pump as the 1200 does.
Because the fuel tank is under the seat - it's lower than the carbs. You can't make fuel flow uphill.

The only time the system will gravity feed is when the tank is almost completely full - in which case, there are a couple inches of fuel in the tank that are above the carbs, and it will gravity feed that fuel into the carbs. Once you use up that fuel, and the remaining fuel in the tank is at or below the level of the carbs, it will no longer gravity feed, and without a fuel pump, the engine will starve and quit.

crackercap
Posts: 23
Joined: Sun Mar 24, 2013 11:28 am
Location: waynesboro, VA
Motorcycle: 2007 Honda GoldWing 1800

Re: 1200 wont start

Post by crackercap »

Okay, did get bike to start, and it will idle very good, but any attempt to increase throttle causes engine to quit and will not run even with choke closed.



Post Reply