Sunday, March 16.

BREAKING NEWS

  • >>19-Apr-2010: XJ650 Hardtail Chopper
  • >>07-Apr-2010: The New Everything Yamaha XJ650 Site
  • >>06-Apr-2010: Hacked
  • >>23-Jul-2009: XJ650 Adventure
  • >>26-May-2009: Green with Envy
  • >>06-Apr-2009: HOW TO: Bench Synch your Carbs
  • >>30-Mar-2009: HOW TO: Install a Headlight Modulator
  • >>27-Mar-2009: Red Beast
  • >>12-Jan-2009: HOW TO: Test a Relay
  • >>11-Jan-2009: Silver Special Maxim

XJ650 Hardtail Chopper

I came across this chopper on my countless hours spent looking at pictures of Yamaha Maxim and Seca motorcycles. I really loved the clean look of this hardtail chopper. I had the misfortune of losing my muffler on a midnight ride into Istanbul, Turkey and I remember how loud it was. Looking at the missing muffler on this motorcycle makes me cringe thinking about the noise this bad boy must unleash. The owner of this Yamaha XJ650 hardtail is a g...

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The New Everything Yamaha XJ650 Site

Well after many hours in front of the computer I have given the Everything Yamaha XJ650 site a complete face lift. I hope you like the new look. T...

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Hacked

Over the weekend this site was hacked. I'm not sure why, it's not as if we have a huge following. I'm pretty sure it's the Honda CBR crowd jealous...

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XJ650 Adventure

I know alot of people just come to this site for the great 'How-To's" and to get ideas for their XJ650 restoration projects but I wanted to direct...

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Howto

HOW TO: Bench Synch your...

This is a "How-To" on bench-synching carburetors. I've noticed quite a people (me being one of them) searching for clear instructions on how to do this. At some point recently I came upon them, but I can't seem to find them anymore. So, I decided to

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Fuel

HOW TO: Bench Synch your...

This is a "How-To" on bench-synching carburetors. I've noticed quite a people (me being one of them) searching for clear instructions on how to do this. At some point recently I came upon them, but I can't seem to find them anymore. So, I decided to

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Electrical

HOW TO: Install a Headli...

Have you ever seen those motorcycles coming at you with those headlight modulators? The pulsating headlight makes them very noticeable to other motorists. Unfortunately, these units can be rather expensive. After doing some research, I've come up wi

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Engine

Readersrides

XJ650 Hardtail Chopper...

I came across this chopper on my countless hours spent looking at pictures of Yamaha Maxim and Seca motorcycles. I really loved the clean look of this hardtail chopper. I had the misfortune of losing my muffler on a midnight ride into Istanbul, Turk

More...

Chasis

HOW TO: Change your fork...

You noticed it sometime back, but ignored it hoping it would go away. But, it hasn't. In your embarrassment, you quickly wipe off your fork tubes when meeting friends for fear that they might say something. Worse yet, it's gotten so bad that your fr

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Travel

XJ650 Adventure...

I know alot of people just come to this site for the great 'How-To's" and to get ideas for their XJ650 restoration projects but I wanted to direct you to another side of owning a Yamaha XJ650... riding! As the administrator of this blog you can gues

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HOW TO: Bench Synch your Carbs

Posted on April 6, 2009 and filed under , , , . You can follow any responses to this entry through theRSS 2.0 . You can leave a response or trackback to this entry from your site

This is a "How-To" on bench-synching carburetors. I've noticed quite a people (me being one of them) searching for clear instructions on how to do this. At some point recently I came upon them, but I can't seem to find them anymore. So, I decided to add my own 'How-To' with the hope that future XJ'ers will find this guide an asset.

The carburetors we'll be working on today are a "junk" set that came on my wife's 1982 XJ650J Maxim. They may look okay on the outside, but they've got cancer on the inside. We'll need two Paperclips and a Phillips-Headed Screwdriver for this tutorial. Let's get started.

Here are the steps...
1. Turn all the Synchronization Screws clockwise until they bottom out on their springs.

Yamaha XJ650 How To Bench Synch Carbs
2. Take two Paperclips of the same gauge and bend them to match the illustration.

Yamaha XJ650 How To Bench Synch Carbs
3. Rock the Throttle Lever open with your right hand and slide the paperclip (the one with the short bend) between the Venturi and the Butterfly of Carburetor No. 3 (see first picture above for Carburetor positions) with your left hand. Gently let loose of the Throttle Lever so that it pinches the Paperclip. You will want the Paperclip positioned as close as possible to bottom dead center of the Venturi.

Note: if the Butterfly does not pinch the Paperclip securely, you will need to turn the Idle Adjustment Screw counterclockwise until it does. Refer to Step 9 for the location of the Idle Adjustment Screw.

Yamaha XJ650 How To Bench Synch Carbs
4. With your Phillips-Headed Screwdriver, turn the No. 4 synchronizing screw counter-clockwise while sliding the other paperclip in and out between the venturi and the butterfly. Do this until the paperclip is "grabbed" by the butterfly. This butterfly should now match the butterfly of carburetor No. 3.

Yamaha XJ650 How To Bench Synch Carbs
5. Moving to the No. 2 synchronizing screw, repeat Step 4 on carburetor No. 2's butterfly.

Yamaha XJ650 How To Bench Synch Carbs
6. Lastly, adjust the last synchronizing screw (No. 1) so that carburetor No. 1's butterfly matches carburetor No. 3's butterfly.

Yamaha XJ650 How To Bench Synch Carbs
7. Once you're satisfied that all four butterflies are set approximately the same, hold them up to a light source and compare with your eye. Adjust as needed.

Yamaha XJ650 How To Bench Synch Carbs
8. Again, with your right hand, rock the throttle lever open and remove the paperclip from carburetor No. 3.
9. From the backside of the carburetor set, turn the idle adjustment screw so that a sliver of light can be seen between the venturi and the butterfly of carburetor No. 3. If you've set everything up correctly, the same amount of light should be visible looking through the other three carburetors.

Yamaha XJ650 How To Bench Synch Carbs

Yamaha XJ650 How To Bench Synch Carbs
That's it! It's time to re-install your carburetors and finish fine-tuning... But that's a whole other "How-To".


(Written by Don Bangert Author of several How-To's and the blog, The Path Less Traveled.)

2 Responses for “ HOW TO: Bench Synch your Carbs”

  1. hootinouts says:

    Excellent advice. This is a very reliable way of bench sychronizing a bank of carbs as I have used this same method. I would like to offer one suggestion: instead of a paper clip use the shank of a small drill to set the butterflys.

     
  2. Anonymous says:

    Great how to thank you for the information

     

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