radiator cap


Information and questions on GL1200 Goldwings (1984-1987)
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Smaltz79
Posts: 12
Joined: Sun Apr 17, 2016 7:09 pm
Location: Sugar Land TX
Motorcycle: 1984 Goldwing Interstate

radiator cap

Postby Smaltz79 » Sun Aug 14, 2016 8:57 pm



my bike runs a little warm in Houston right now, change every thing from new water pump, new head gaskets. had the radiator pressure tested. I bought a new cap from cheap cycle parts and it was too small. Read in a forum that the 84 neck came in 2 different sizes. paid $30 buck plus shipping. where can i buy a after market in Houston area that will fit the larger neck? second question is that even though my radiator holds pressure could it be plugged? I am thinking of getting it rodded out or can i buy a good used radiator off ebay but a different year model?



CrystalPistol
Posts: 262
Joined: Wed Mar 10, 2010 9:07 pm
Location: Shenandoah Valley of Virginia
Motorcycle: 1985 GL1200A
1997 GL1500SE Lehman Trike

Re: radiator cap

Postby CrystalPistol » Sun Aug 14, 2016 9:15 pm

August .... Houston ..... I bet it ain't all that's warm there?

What do you mean by "a little warm"?

Sure, it could be a restriction in the radiator .... but be sure there's a problem first. Does the cooling fan ever come on / cycle off?
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twocams
Posts: 554
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: radiator cap

Postby twocams » Sun Aug 14, 2016 10:31 pm

Take your old cap and go to Napa, O'reilly auto parts. You're mainly looking for the right size and right cap pressure. make sure its what the book calls for 13 psi/14 psi/15 psi? I would just rod your radiator out if that's what you end up doing. Take your finger and lightly run down the front of the radiator. If fins flake off your radiator, junk it. Get another.

twocams

Smaltz79
Posts: 12
Joined: Sun Apr 17, 2016 7:09 pm
Location: Sugar Land TX
Motorcycle: 1984 Goldwing Interstate

Re: radiator cap

Postby Smaltz79 » Mon Aug 15, 2016 11:36 am

fins are fine and it hold pressure. i will have the radiator rodded out. i dont know what psi it takes for the cap but it is an after market cap. i read that in 84 the radiator neck was tow different size. if the bike was built in the spring it would be a 1100 neck or fall it would be a small neck. I know now it is the big neck

Smaltz79
Posts: 12
Joined: Sun Apr 17, 2016 7:09 pm
Location: Sugar Land TX
Motorcycle: 1984 Goldwing Interstate

Re: radiator cap

Postby Smaltz79 » Mon Aug 15, 2016 11:42 am

fins are fine and it hold pressure. i will have the radiator rodded out. i dont know what psi it takes for the cap but it is an after market cap. i read that in 84 the radiator neck was tow different size. if the bike was built in the spring it would be a 1100 neck or fall it would be a small neck. I know now it is the big neck.

answering crystalpistal
it creeps up to 200 to 220 psi. i have a control on the fan so i run it all the time. Mainly gets warm when i riding it. 2 new water pumps, 2 times pressuring the tank, new hoses, new head gaskets, replaced the radiator overflow tank with another better conditioned one. have changed everything but the cap & rodded the radiator. Even put in purple ice to lower the temp. Also bought honda antifreeze. tried to do everything by the book

harvey01
Posts: 630
Joined: Thu May 31, 2012 7:14 pm
Location: Henrico, Virginia
Motorcycle: 2004 GL1800

Re: radiator cap

Postby harvey01 » Mon Aug 15, 2016 11:59 am

According to HDL the Honda stock cap is available: CAP, RADIATOR,19045-MZ3-405, $21.56 plus shipping.
CAP, RADIATOR at $21.56

Go to this website: http://www.hondadirectline.com/OEMpartf ... 1200AA_(84)_MOTORCYCLE,_USA,_VIN%23_1HFSC142-EA002273_TO_1HFSC142-EA034452/RADIATOR/GL1200A-84-A/2Y14MG9EAF14MG9E01B
harvey
Ride Safe and Ride Often

User avatar
twocams
Posts: 554
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: radiator cap

Postby twocams » Mon Aug 15, 2016 12:16 pm

Have you tried a different thermostat, maybe one that would open a little sooner. If the carburetor are running to lean can make the bike run hotter. Too much town riding with stop and go traffic, run hotter. If it's 100 deg. outside the only way to keep it halfway cool is to ride 70 mph on open road. Just my .02 worth.

twocams

Smaltz79
Posts: 12
Joined: Sun Apr 17, 2016 7:09 pm
Location: Sugar Land TX
Motorcycle: 1984 Goldwing Interstate

Re: radiator cap

Postby Smaltz79 » Mon Aug 15, 2016 7:17 pm

thanks for all the help everyone. Ive waited 27 years to buy a goldwing. Didnt like the newer looking versions. the thermostat that i bought was oem. I bought a cap at orielly's tonight that was 13 PSi. the other cap was 16 psi. once i get my wiring problem worked out ill test it out with the cap you recommended.

Smaltz79
Posts: 12
Joined: Sun Apr 17, 2016 7:09 pm
Location: Sugar Land TX
Motorcycle: 1984 Goldwing Interstate

Re: radiator cap

Postby Smaltz79 » Tue Aug 16, 2016 12:43 pm

to harvey01

that is the same radiator cap that i just bought and it will not fit too small. does anyone or can they verify that 84 gold wings have two different size necks. currently i have an after market cap, but would like to put a Honda cap on it. I read that early 84 may have the neck size is larger than bike built in the fall.

harvey01
Posts: 630
Joined: Thu May 31, 2012 7:14 pm
Location: Henrico, Virginia
Motorcycle: 2004 GL1800

Re: radiator cap

Postby harvey01 » Tue Aug 16, 2016 12:57 pm

Smaltz79, When I looked it up, I used the center choice for which model you have. I did not reference the part number with the other models of that bike. I hope you have looked it up using the correct information. If that is the same model number as what you have already bought, I would go to a dealer and see what he can find. Make sure you talk with someone who knows what he is doing when looking for parts and some of the people behind parts counters are just learning. Been there and went through that process.

I do recall when I looked this up that there were two caps available--unknown to me what the difference is.

Hopefully with the new thermostat and cap from the auto store you will have solved the problem.


harvey
Ride Safe and Ride Often


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