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  The "At witt's End Backfire Cure"

  • Created by: Tykes_Place
  • Published: 03-03-2018, 04:44 PM
  • 0 comments

  The "At witt's End Backfire Cure"

  Reprinted by permission from Mr Tidy's tech tips
  
  I report this as a last ditch effort for those who may experience extreme situations where their bikes are persistently backfiring through the intake OR exhaust, AND conventional efforts to fix the problem prove fruitless.
  
  It is not a panacea for problems that might be fixed through normal jetting and adjustments. I do want to stress that this is not the best way to fix MOST backfiring problems. Usually the correct fix is...

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  Setting up and Adjusting your TPS

  • Created by: Tykes_Place
  • Published: 03-03-2018, 04:43 PM
  • 0 comments

  Setting up and Adjusting your TPS

  The TPS adaptor on the carburetor is responsible for reporting the position of your throttle to the ignition (ignitor). The ignition uses this information to adjust the timing curve on the bike to match driving conditions.
  
  
  
  We have seen some broken TPS's that failed to do so, and the bikes they came in on were somewhat sluggish to drive. To assist those who may need to check, adjust, or replace their TPS adaptors we put together this brief paraphrase of the instructions...

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  Rejet Your Carburetor

  • Created by: Tykes_Place
  • Published: 03-03-2018, 04:41 PM
  • 1 comment

  Rejet Your Carburetor

  Reprinted by permission from Mr. Tidy's Tech Tips
  
  Re-Jet Procedure
  Many thanks to "Thor"
  
  This is how to change your jet and needle, for an explanation of how your Carburetor works. Stargazer has a great article by the Mucker at his site. The jetting is not terribly complicated if you remember this:
  
  Do not disconnect the throttle Position sensor from the Carburetor.

  • Remove the nut that holds the choke cable on the left side, and remove the

  ...

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  Principles of Modern Motorcycle Carburetor Function

  • Created by: Tykes_Place
  • Published: 03-03-2018, 04:39 PM
  • 0 comments

  Principles of Modern Motorcycle Carburetor Function

  Reprinted by Permission from Mr Tidy's Tech Tips
  
  Specifically in application to the Yamaha XV1600 Road Star
  
  Whatever the motorcycle or automobile, most carbs work on the same principles and internal systems to deliver fuel in the proper mixture ratio to the engine. The actual components within the carb(s) that use those principles vary quite a bit, but their ultimate execution remains the same. They can be broken down into separate “circuits”, called that because, like...

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  Last edited by Tykes_Place; 03-03-2018, 06:16 PM.

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  Pilot Jet and PMS explained

  • Created by: Tykes_Place
  • Published: 03-03-2018, 04:35 PM
  • 0 comments

  Pilot Jet and PMS explained

  Some of you have recently sent me notes asking for clarification between Bulldog's Jetting Primer and Mucker's Principles of Carburetion, with respect to what sounds like different explanations of how the Pilot circuit works in the Road Star's stock Mikuni carburetor.
  
  A careful reading, and a little more understanding about the differences between how gasses flow (air) and liquids flow (gasoline) will help to clear this up.
  
  After a thorough examination of one of my extra...

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  Mikuni/Dyno Jet Conversion Table

  • Created by: Tykes_Place
  • Published: 03-03-2018, 03:51 PM
  • 0 comments

  Mikuni/Dyno Jet Conversion Table

  Reprinted by permission from Mr. Tidy's tech tips

  Mikuni / Dynojet Jets

  ...

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  How To Adjust the Accelerator Pump

  • Created by: Tykes_Place
  • Published: 03-03-2018, 03:44 PM
  • 0 comments

  How To Adjust the Accelerator Pump

  Reprinted by permission from Mr Tidy's tech tips
  
  On the 40mm Mikuni Carburetor
  
  One of the problems I've had with the Road Star is a coughing or backfiring out the carburetor through the breather. One of the cures is to decrease amount of fuel injected by the accelerator pump when first opening the throttle.
  
  
  
  
  
  Look in the lower right-hand portion of the image, this is the area of the accelerator pump.
  
  Duration adjustm...

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  Check your float bowl level

  • Created by: Tykes_Place
  • Published: 03-03-2018, 03:41 PM
  • 3 comments

  Check your float bowl level

  Float Adjustment Procedure
  
  Some symptons of a too high level are,

  • The choke does not work properly.
  • You'll see liquid spitting in the end of the exhaust after initial start up.
  • The carbon deposit will not be uniform and you'll see streaks or liquid stains.
  • Your exhaust pipes are eternally black no matter what you set your jetting at.

  
  Use a good set of needle nose vise grips to break the tightness of the screws that hold the float bowl to the carburetor body. Others have...

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  Last edited by Tykes_Place; 03-03-2018, 03:43 PM.

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  Bulldogs Carb Jetting Primer - How to Dial it in

  • Created by: Tykes_Place
  • Published: 03-03-2018, 03:37 PM
  • 1 comment

  Bulldogs Carb Jetting Primer - How to Dial it in

  David is a Technical Moderator, for Baron's Custom Accessories Technical Forum
  
  I thought I would explain basic carb and jetting functions so everyone could better understand how it all works.
  
  These carbs have two primary fuel circuits; the slow/pilot circuit and the main circuit, which have several parts or components that will effect the mixture at different throttle positions. There are 4 throttle positions that are used to determine what component is effecting the mixture....

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  Adjustable PMS for the Road Star

  • Created by: Tykes_Place
  • Published: 03-03-2018, 03:36 PM
  • 0 comments

  Adjustable PMS for the Road Star

  Disclaimer: I am not responsible for you screwing up your ride, yourself or someone else by you making this modification. This is what I did and it works OK for me. Don’t blame me if you are a D.A (and I don’t mean district attorney) because you trashed your carburetor or set yourself on fire with the soldering iron from the gas you did not empty from the carb.
  
  Tools and Materials Used:

  • - Soldering iron
  • - Solder - I used silver solder because it is stiffer. It is available at your

  ...

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