LinkBack Thread Tools
post #1 of 5 (permalink) Old 10-31-2008, 09:28 PM Thread Starter
Junior Member
Join Date: Oct 2008
Location: Waverly, Nebraska, USA
Posts: 3
Post imported post

I have been working on my dad's 87 1200 interstate. The initial problem was fuel running out of the carbs after starting engine after sitting for two years. I removedand disassemled all four carbs and found 3 needles stuck open. My brother bought four aftermarket carb kits and I cleaned and reassembled the carbs. I set the float level at 7.5 mm as per the clymer manual. I also set the pilot screws as per the clymer manual. Isinked the carbs using a mercury manometer. Every thing seemed to be working as expected untill I went for a test ride. Itacted like it was starving for fuel. I removed the carbs again andreset the float level to 5 mm but this seemed to have no affect. I have checked the fuel pump, it checked OK. I also replaced the diaphram and spring for the secondary cutoff valve. What makes the vacuum cylinder and diaphram go up? It doesn't appear to have a hole in the carb body where the diaphram has a small hole at it's edge. In short, I'm stumped.

87 Interstate is offline  
Sponsored Links
post #2 of 5 (permalink) Old 10-31-2008, 10:11 PM
Senior Member
hatchetman's Avatar
Join Date: Jun 2007
Location: Bowser, Vancouver Island, British Columbia, Canada
Posts: 3,031
Post imported post

did you replace the needle valves? If you did, & they were not from mother honda, your bike will not run well. if your float levels are out by a few mm, Your bike will run rich or lean depending which way you are out of adjustment.

the ports in those carbs are extremely small & much patients must be used in the cleaning process to ensure good performance. Is there rust in the fuel tank? This will ruin all your hard work in minutes if particals get into the carbs.

Randakks makes the best carb kits besides honda. all other ones seem to have a huge failure rate with forum members. I would suggest that you treat your fuel with sea foam. once you can get it running well enough for a good ride, pour 1/2 can into a full tank & go.

Critical maintenance on a wing is timing belts. if they snap, slip etc you will get imediate internal engine damage. Your spark plug boots have resisters inside them. they will also fail in time. They unscrew from the plug wire. If you take them off, look at the plug wire where they screwed out of. if the solid core wire looks corroded, trim it back slightly to expose clean wire & replace boots.

If you get everything set right, your bike will be a stump puller & run like a smooth car with alot of torque!

Welcome to the forum, Ask lots of questions if you have any & keep us posted!

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
hatchetman is offline  
post #3 of 5 (permalink) Old 11-05-2008, 04:33 PM Thread Starter
Junior Member
Join Date: Oct 2008
Location: Waverly, Nebraska, USA
Posts: 3
Post imported post

Thanks for your response. I need all the help I can get. I now have a question about the big diaphram in the top of the carb. I have checked the diaphrams by mildly stretching these over a light and found no holes or tears. At the edge of the diaphram there is a small loop which is a molded part of the diaphram. It lays over a small depression in the body of the carb which would lead one to think there is a hole in this depression to allow vacuum to pull air out from on top of the diaphram to cause it to raise up against the spring tension thus opening the airway and raising the main needle up out of the main jet. My problem is this, I cannot see a hole in this depression for any air to pass through. I have cleaned this with an aerosol can of carb cleaner and compressed air, and have searched for an air passage with a magnifying glass. I cannot find a hole there. Can you explain in great detail how is this diaphram supposed to lift up? Am I missing somthing? I am looking to answer this issue before I pull the carbs off again to try new needles and seats again.

87 Interstate is offline  
post #4 of 5 (permalink) Old 11-05-2008, 05:47 PM
Senior Member
morram's Avatar
Join Date: Mar 2006
Location: Near Sacramento, California, USA
Posts: 2,137
Post imported post

I may be wrong but I thought the diaphragm move by differential, not vacuum

cagers on cell phones scare me
I owe my life to a Stebel Nautilus
morram is offline  
post #5 of 5 (permalink) Old 11-05-2008, 06:39 PM Thread Starter
Junior Member
Join Date: Oct 2008
Location: Waverly, Nebraska, USA
Posts: 3
Post imported post

wouldn't vacuum on top of the diaphram create a difference in pressure to lift the diaphram?

87 Interstate is offline  
Closed Thread

  Steve Saunders Goldwing Forums > Forums > Goldwing Technical Forum

Quick Reply

Register Now

In order to be able to post messages on the Steve Saunders Goldwing Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
1200 carb rebuild ErnieB Goldwing Technical Forum 3 05-12-2012 03:17 PM
carb rebuild tallyho Goldwing Technical Forum 3 03-29-2009 08:59 PM
Parts for carb rebuild 84 1200 timbuck For Sale/Wanted Forum 6 12-10-2008 06:56 PM
Rebuild of a GL 1200 Interstate to a GL 1200 Aspencade ? John Hjorth Goldwing Technical Forum 5 08-18-2005 02:21 AM
86 1200 carb rebuild pooldeeznuttz Goldwing Technical Forum 3 07-02-2005 06:27 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome