Fuel Mileage Issues

Warning: Controversial Material!

I get lots of inquiries about fuel mileage these days. It’s no surprise given highly volatile fuel prices! Here’s what I know about the subject.

(FILES) In a file picture taken on February 28, 2012 a motorist refuels at a gas pump in the northern city of Lille. French Prime Minister Jean-Marc Ayrault promised on August 22, 2012 a modest and temporary cut to the taxes on petrol and diesel in order to reduce pump prices for drivers. AFP PHOTO / PHILIPPE HUGUENPHILIPPE HUGUEN/AFP/GettyImages

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Randakk’s Master Carb Overhaul Kit® for Honda GL1000 Parts Location Graphic

Note: The graphic for this Tech Tip is provided courtesy of Tom Thomas of Austell, GA.

My GL1000 carb video goes into great detail on the placement of these bits, but the nice graphic below  provided by Tom Thomas is a handy quick reference.

GL1000 Location Diagram

Not so “Green,” No-Drop Idle Mixture Adjustment Method

I find the factory recommended idle mixture screw setting specs to be very close to ideal. They are listed here for the Honda GL1000.

Idle FUEL Mixture Screw on Honda GL1000

I do usually richen them up an extra 1/8 to 1/4 turn (out) to compensate for the leaner modern “gasoline” which is diluted with ethanol in most US markets.

But sometimes, you just need an excuse to do some high performance tuning on your bike! 🙂 

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Motorcycle Petcocks 101

What is a petcock? Why is important to vintage motorcycle owners?  . 

Can Proper Petcock Use Prevent This?

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Flooding Issues on Vintage Hondas

Flooding is a common problem in vintage Hondas – especially on bikes that don’t get run much.  Flooding can be just a minor aggravation …like hard starting or poor fuel mileage. But, it can also lead to catastrophic problems such as severe engine damage or even a fire!  Flooding issues should not be ignored!

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Viton in Vintage Motorcycle Carburetor Components?

All of the ordinary round orings and many other components in Randakk’s Master Carb Overhaul Kits® are made of genuine Viton®. In fact, every oring we’ve ever shipped has been made of Viton®!

There are actually many “grades” of fluorinated synthetic rubber like Viton®. Randakk’s uses the same spec material that Mercedes and Toyota use in fuel system components that are subjected to the oxygenated “gasoline” marketed in North America.

Plus – through proprietary molds and other tooling assets, we make many other Viton® components ourselves via our own exclusive manufacturing arrangements. The proprietary components made in Randakk’s molds are not available elsewhere.

For diaphragm items such as accelerator pumps and air cut-off valves, we have direct and exclusive sourcing arrangements with superior production partners that by-pass normal trade distribution channels. This allows Randakk’s to impose unique-to-Randakk’s product specifications. 

Why is this important? Read on.

Float Bowl Gaskets VITON

Randakk’s Viton Float Bowl Gaskets

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January 2018’s Featured Products

Happy New Year, Goldwing lovers!

Looking back on 2017,  you probably put a healthy number of miles on your Honda. You know this is right up the Randakk’s alley when we say that you may be due for a carb cleaning/rebuild.

  • Is your motorcycle hard to start?
  • Is it running a bit off-kilter?
  • When you dial the throttle, are you getting the desired performance?
  • Do you ride with the choke on? (this means you have a clogged pilot jet)
  • Sluggish acceleration?
  • Bad fuel economy?

These are all signs that your bike is in need of some carburetor love. In most scenarios, there’s only really one way to see if your carbs are due for a complete rebuild: pull them off the bike and take a look inside. And since you have them off and dissembled, you might as well do your future self a favor and rebuild them now.

January’s Featured Products are dedicated to those precious carburetors, everything from the all-inclusive Randakk’s Carb Rebuild Kits to the e-clips.

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“Insensitive” Idle Mixture Fuel Screws?

I often field this common complaint: 

“I’ve noticed that turning the idle mixture screws nets different results on each of the individual carbs on my Honda GL1000:

  • #1 will kill the motor if turned all the way in
  • #3 has NO EFFECT on engine speed regardless of where it is set
  • #2 has what might be considered a “normal” effect
  • #4 has only a very slight effect if any at all

What does this mean????? I’m a bit confused?  Help please!!!!”

GL1000 Idle Fuel Mixture Screws

GL1000 Idle Mixture Fuel Screw

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The Single Most Common Carburetor Problem (Clogged Pilot Jets) and How To Fix – by Ari Henning

I’m happy to share this excellent video tip created by Ari Henning of Motorcyclist Magazine. Ari is a notorious AHRMA road-racer and all-around swell guy!

This is excellent information.

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Randakk’s Jetting Advice For Vintage Honda CV Carbs

Whenever I’m asked about “jetting” issues on vintage Honda carbs – here’s my strong advice:

JoukoCarbs3

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