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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More on Fuel And Fuel Additives – Fear the Corn?

Warning: Controversial Material!

Corn Ethanol Fuel

I grew up in a farm family in the South, so I’m very fond of corn. Of course I like grits, but my favorite form of corn is high quality bourbon! I have personally benefited from crop subsidies and understand the benefit of the emerging ethanol (made from corn) fuel market to corn farmers. I am sympathetic to their issues.

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Carb Cleaning (in situ lazy method)

You might consider Randakk’s GL1000 Carb Rebuild Video

Yamaha Carb Cleaner

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Fuel Filter Mounting Tips

Randakk’s High Performance Fuel Filters have many technical advantages and are super easy to install as demonstrated in this short video by by Shasta Smith – the Vintage Monkey.

More details on Randakk’s High Performance Fuel Filters here.

Replacing Throttle Shaft “Felts” on Honda GL1000, GL1100, GL1200, DOHC-4, CBX, CX500, etc.

Replacing Throttle Shaft “Felts” on GL1000, GL1100, GL1200, DOHC-4, CBX, CX500, etc.

Felt Replacement

Throttle Shaft Felt Replacement  (photo courtesy Aaron Williams of Dude’s Garage)

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Shade Tree Diagnostic Tests!

I was very fortunate to grow up in a neighborhood and farm family full of excellent shade-tree mechanics. Mostly they were short on cash and long on resourcefulness.

I learned quite a lot by pestering these very talented home-gown mechanics. 

Shade Tree Mechanics

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Vintage Motorcycle Carbs – Lean vs. Rich?

Carb Adjustment, Lean or Rich

Experienced wrenches sometimes forget that we operate with a set of understandings that becomes so ingrained as to become second nature. I don’t normally rely on gizmos like the K&N Air Fuel Monitor shown on my supercharged GL1000 (above). But since things happen so quickly on that bike, it’s a useful and entertaining tuning aid.

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Honda GL1000 Emulsion Tube Variations

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

Emulsion tubes are perforated nozzles designed to pre-mix fuel and air for subsequent metering by the main fuel jets. Sometimes these are also called:

  • Main jet nozzles
  • Main jet holders

Emulsion Tube Variations

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Honda Float Bowl Drain Screw Placement

Honda GL1000 float bowl drain screws will be difficult to loosen for periodic maintenance if the float bowls are installed onto the wrong carbs.

There are specific left/right carb bowls plus a special bowl for carb #1 (with vacuum hose barb). The bowls will bolt up and run fine on the wrong carbs, but it will be hard to get a screwdriver blade onto the drain screws when the carbs are installed on the bike.

Carb Bowl Drain Screws

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Honda GL1000 Plenum Leak Testing Method for Air and Fuel Circuits

This Tech Tip is an abbreviated version of material I show in detail in the GL1000 Carb Rebuilding video. The pictures are mostly self-explanatory.

I like to do each of these tests twice: once before the rebuild begins to help me understand what I’m likely to find inside the carbs and again when the rebuild is nearing completion to check the work.

These tests are highly recommended. More than one customer has omitted seals or made other mistakes during a rebuild. These tests can save your bacon and help you avoid the time-consuming hassle of having to do the carb installation twice!

GL1000 Plenum Leak Testing

GL1000 Plenum AIR Circuit Testing Method

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