carb needle and spring


Information and questions on GL1200 Goldwings (1984-1987)
  • Sponsored Links
Post Reply
cgoins
Posts: 3
Joined: Tue Apr 12, 2011 3:27 pm
Location: pennsauken, NJ
Motorcycle: 1987 GL1200I Interstate

carb needle and spring

Post by cgoins » Sat Nov 11, 2017 5:19 pm



I am rebuilding a 1984. I am building my aspencade carburetor(California version and want to modify it to be a 49 State carb. It is my understanding that there was an upgrade on the needle and spring assembly due to problems with performance at 2000-3000 RPM. First, is there anything I need to do on the carb other than plug the vacuum ports associated with the California emissions and second, how do I know if my carbs have the upgraded needle and spring assembly?



User avatar
twocams
Posts: 662
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade ( sold in Canada), 2003 K1200GT BMW, 1969 R69S BMW,92 R100 RT 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: carb needle and spring

Post by twocams » Sat Nov 11, 2017 8:00 pm

What is a California Wing doing in NJ anyway? Your sure its a Calif.? Most of the up grades, I say most, of the up grades were done yrs. ago. And what spring are you referring too. I dont remember any on my GL.carbs.

twocams

User avatar
ziesenis
Posts: 9
Joined: Wed Apr 15, 2015 9:29 pm
Location: Pittsburg, Ks USA
Motorcycle: 1986 GL1200 Interstate w/Voyager trike kit

Re: carb needle and spring

Post by ziesenis » Mon Nov 13, 2017 2:24 am

The Honda factory has determined that low-speed
driveability (hesitation under light acceleration at
approximately 2,000-3,000 rpm) can be improved on the
following models:
a. 1984 GL1200 Interstate and Aspencade (49-state
models): engine serial numbers 2400107-2423769
(Honda Service Bulletin GL1200 No. 10 June 1985).
b. 1985 GL1200 Interstate and Aspencade (Calif,
models): all models as applicable (Honda Service
Bulletin GL1200 No. 10 June 1985).
c. 1985 GL1200 Interstate and Aspencade (49-state
models): engine serial numbers 2500001-2509296
(Honda Service Bulletin No. 9 June 1985).
If your Gold Wing falls into this area, take your bike to
a Honda dealer and have this modification performed. (HONDA DOSE NOT DO THIS REPAIR FOR FREE ANYMORE)
This procedure requires that the carburetor assembly be
removed, partially disassembled and new parts (slow jets,
jet needles and diaphragm springs on some models) be
installed. The carburetors must then be synchronized and
an idle drop mixture procedure performed.


We change the slow jets #35 to #40 (or you can drill out the #35 using a #77 drill bit) and use either a #105 or #108 to fix the slow speed hesitation. Honda's service bulletin also changed the needles and slide springs ( we don't ) and they run great. Just make sure you get all the little passage ways cleaned.

If you do want to change the needles and slide springs you will need the ones that are in an 1986 or 1987 model.
If they've been changed by Honda there should be a letter "i" stamped on the carb. :mrgreen:

Post Reply