Everything Affects Everything!

I was inspired to create this Tech Tip after reading a post by Jim Myers on the Classic Wing Club mail list (highly recommended!). The general context of the thread surrounded the issue of setting idle mixture screws.

Always Be Carbureting

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Knuckle Busting 101 – Throttle Cable Detach / Attach

You might consider this item: Randakk’s GL1000 Carb Rebuild Video

Throttle cable replacement on GL1000s is a straightforward operation, but there is a trick I will share which makes it much easier to accomplish.

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Special Tuning Tips for ’77 GL1000s + Carb Top Service

You might consider this item: Randakk’s GL1000 Carb Rebuild Video

Honda made a number of jetting tweaks in ’76 (K1 and LTD) and again in ’77 (K2) for US-bound GL1000s to cope with tightening emissions regulations. Other markets were affected as well. Honda necessarily made the bikes progressively leaner through these model years. Social responsibility is a good thing for large corporations, but these were not great moves from the rider’s point of view. Riding a bike with overly lean carburetion may be “green,” but it certainly can be frustrating.

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Air Cutoff Valve Overhaul

You might consider this item: Randakk’s GL1000 Carb Rebuild Video

The air cutoff valve is a simple but vital component of the carburetor system on GL1000s. It’s function is to eliminate backfiring on hard deceleration (throttle fully closed). Hard deceleration creates a high vacuum signal in the intake tract which activates the valve. When activated, it restricts the flow of air to the external idle circuit air jets thereby richening the mixture. This slightly richer mixture is calibrated to eliminate backfiring in this operational mode.

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Approved Carb Rebuilder Program – While You are Waiting Instructions

Here are some recommended maintenance items you can address while you are awaiting the return of your rebuilt carbs. Most of this is written from the GL1000 perspective, but generally applies to other models as well.

Imperative – all tune-up issues must be in order before you synchronize your freshly serviced carbs. Especially: plugs, plug wires, points and timing! Click here for my “Tech Tips” section for helpful information on setting points and ignition timing properly.

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Removing / Installing Intake Runners

It is very important that the intake runners on your GL1000 provide a leak-free connection between the individual carbs and the cylinder head. During carb rebuilds, I remove the intakes for individual inspection and leak testing. This is also necessary to gain access for inspecting the throttle butterfly plates and retaining screws as well as the idle nozzles.

However, you probably shouldn’t disturb the bonded rubber connection to the carbs any more than necessary. Remember these parts are 25+ years old and the rubber is not as pliable as when new.

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Honda GL1000 Carb Removal

Please consult a manual before you begin for additional information on carb removal. Do not attempt removing your carbs if you lack mechanical aptitude, proper tools or general intelligence. While I’m on the topic of manuals, I rely on three: the Official Honda GL1000 Workshop Manual, plus the ones from Clymer’s and Haynes. Generally, the Honda manual is sufficient, but sometimes the others provide helpful cross-reference.

I strongly recommend that you obtain at least one good manual before you delve into any repairs or maintenance. A good source for the Honda manual is: http://www.helminc.com/helm/homepage.asp

My lawyer asks me to remind you that you are advised to heed all recommended safety practices detailed in the manuals listed above and that you assume ALL risks.

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Problem with Aftermarket Jet Needles

You might consider this item: Randakk’s GL1000 Carb Rebuild Video

Recently, I’ve discovered some improperly sized jet needles that were provided with aftermarket carb rebuild kits. The needles looked identical to the original but did in fact have a significantly narrower cross section at the mid-point of the tapered section.

Effectively, this made the needles much richer. The brand in question is NAPCO and the kits were for a ’76 which happens to be one of my bikes. The result of these improper needles was the bike in question ran fine near sea level (although a plug check showed it was running slightly rich in the mid-range and the fuel mileage was terrible).

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Throttle Return Spring Details

You might consider this item: Randakk’s GL1000 Carb Rebuild Video

Recently, a GL1000 owner was in my shop with an odd complaint. He reported that very heavy pressure was required at the throttle twistgrip to increase or maintain engine speed. Suspecting that the throttle cables were worn or damaged, the owner had just replaced both throttle cables, but this offered no improvement.

My test ride verified that indeed there was something amiss. This bike ran great, but after just a few miles the effort required at the throttle made my right forearm ache!

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Fuel Sender Issues

This Tech Tip is provided courtesy of Howard Halasz – noted early ‘Wing Guru. Howard is a frequent contributor of technical columns and other information to GWRRA’s Wing World Magazine. This Tech Tip applies to any 4 cylinder GoldWing (GL1000, GL1100 or GL1200). 

“OK! Now that you’ve overhauled your carburetors using your Randakk’s® Master Carb Overhaul Kit and installed them on your Gold Wing, you find out that your Wing now performs better than it ever did since you owned it. You check the lights, turn signals, horn, tachometer, temperature gauge, brakes, and turn signals. Everything looks and sounds great!! Then you notice that your fuel gauge shows EMPTY, although you have a full tank.

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