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So for the past week I have been reading dozens of threads and pages of posts. I have found tons of great pieces of advice that have worked for members, but nothing seemed to be located in one thread (you have to read...sometimes...10-20 pages before you come to an answer).

PLEASE CHECK END OF THREAD FOR CURRENT SYMPTOMS/SOLUTIONS
When members post new/edited or other symptoms/solutions, I'll add to this this thread quote and continue what has been started to prevent reading all the postings.

This is what I have gathered thus far (please correct any mistakes I make because I know that I will make them) and these are by far "typical" symptoms from users:


Is my bike LEAN?

  • Very white plugs
  • Popping/backfiring from exhaust on deceleration
  • Bike wants to die or almost dies in slow maneuvers
  • Blip on the throttle causes the engine speed to hang slightly before recovering
  • Excess fuel in Airbox (from Carburetor spitting fuel to compensate for lack there of)
  • Hesitation or stuttering while starting from a stop in the low rpm range (goes away when higher rpm's are achieved)
Is my bike RICH?
  • Black/oily plugs (also caused from the dreaded Choke)
  • Bike hesitates when heavy throttle is applied or is slow to "speed up" (not to be confused with the 1/8-1/4 throttle turn while your bike is at a stop...the A/F screw affects the 1/8-1/4 turn while the needle/shim affects the mid to higher range)
  • Blip on throttle causes the engine speed to drop below idle and then it recovers
  • Significant gas odor while riding
Solutions for LEAN:
  • Turn out (counterclockwise) A/F screw (start with 1/8 turn increments)
  • Add shim(s) to the needle
Solutions for RICH:
  • Turn in (clockwise) A/F screw (start with 1/8 turn increments)
  • If shim(s) exist, try removing them if A/F screw did fix the problem
Idle Speed:
  • 900rpm +/- 100rpm
  • May need to be set slightly higher for colder temps
Shimming Heights (per SCAR):
  • "Open" style airbox and after market "free flow" pipes... usually about 2or 3 shims.
  • Airbox flowing more air than stock design, but not in the "heavy breathing" class and/or pipes either free flow or somewhat restricted... usually about 1or 2 shims
  • Stock airbox (K&N filter in stock box is still "stock") and after market pipes... usually 0 or 1 shims
  • Stock airbox and stock pipes...tune the A/F screw for maximum performance.
Shimming note (per Charlie D):
  • Clip positions on after market are the same as shimming up or down ( a shim for half clip position).
Helpful Links:

Link to help understand the workings of Carburetor. http://www.factorypro.com/tech_tunin...m_engines.html

Here's another good read, talks about jetting, needle shimming and plug chops ect: http://crapmods.com/phpBB/viewtopic.php?t=3604
 

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Discussion Starter · #3 ·
This is what I have gathered thus far (please correct any mistakes I make because I know that I will make them) and these are by far "typical" symptoms from users:


Is my bike LEAN?
  • Very white plugs
  • Popping/backfiring from exhaust on deceleration
  • Bike wants to die or almost dies in slow maneuvers
  • Blip on the throttle causes the engine speed to hang slightly before recovering
  • Excess fuel in Airbox (from Carburetor spitting fuel to compensate for lack there of)
Is my bike RICH?
  • Black/oily plugs (also caused from the dreaded Choke)
  • Bike hesitates when heavy throttle is applied or is slow to "speed up"
  • Blip on throttle causes the engine speed to drop below idle and then it recovers
Solutions for LEAN:
  • Turn out (counterclockwise) A/F screw (start with 1/8 turn increments)
  • Add shim(s) to the needle
Solutions for RICH:
  • Turn in (clockwise) A/F screw (start with 1/8 turn increments)
  • If shim(s) exist, try removing them if A/F screw did fix the problem
Idle Speed:
  • 900rpm +/- 100rpm
  • May need to be set slightly higher for colder temps
Shimming Heights (per SCAR):
  • "Open" style airbox and after market "free flow" pipes... usually about 2or 3 shims.
  • Airbox flowing more air than stock design, but not in the "heavy breathing" class and/or pipes either free flow or somewhat restricted... usually about 1or 2 shims
  • Stock airbox (K&N filter in stock box is still "stock") and after market pipes... usually 0 or 1 shims
  • Stock airbox and stock pipes...tune the A/F screw for maximum performance.
Shimming note (per Charlie D):
  • Clip positions on after market are the same as shimming up or down ( a shim for half clip position).
Link to help understand the workings of Carburetor. http://www.factorypro.com/tech_tunin...m_engines.html
 

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Discussion Starter · #5 ·
***UPDATED 05/06/08 @ 0753 cst***

This is what I have gathered thus far (please correct any mistakes I make because I know that I will make them) and these are by far "typical" symptoms from users:


Is my bike LEAN?
  • Very white plugs
  • Popping/backfiring from exhaust on deceleration
  • Bike wants to die or almost dies in slow maneuvers
  • Blip on the throttle causes the engine speed to hang slightly before recovering
  • Excess fuel in Airbox (from Carburetor spitting fuel to compensate for lack there of)
Is my bike RICH?
  • Black/oily plugs (also caused from the dreaded Choke)
  • Bike hesitates when heavy throttle is applied or is slow to "speed up"
  • Blip on throttle causes the engine speed to drop below idle and then it recovers
Solutions for LEAN:
  • Turn out (counterclockwise) A/F screw (start with 1/8 turn increments)
  • Add shim(s) to the needle
Solutions for RICH:
  • Turn in (clockwise) A/F screw (start with 1/8 turn increments)
  • If shim(s) exist, try removing them if A/F screw did fix the problem
Idle Speed:
  • 900rpm +/- 100rpm
  • May need to be set slightly higher for colder temps
Shimming Heights (per SCAR):
  • "Open" style airbox and after market "free flow" pipes... usually about 2or 3 shims.
  • Airbox flowing more air than stock design, but not in the "heavy breathing" class and/or pipes either free flow or somewhat restricted... usually about 1or 2 shims
  • Stock airbox (K&N filter in stock box is still "stock") and after market pipes... usually 0 or 1 shims
  • Stock airbox and stock pipes...tune the A/F screw for maximum performance.
Shimming note (per Charlie D):
  • Clip positions on after market are the same as shimming up or down ( a shim for half clip position).
Helpful Links:

Link to help understand the workings of Carburetor. http://www.factorypro.com/tech_tunin...m_engines.html

Here's another good read, talks about jetting, needle shimming and plug chops ect: http://crapmods.com/phpBB/viewtopic.php?t=3604
 

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Discussion Starter · #7 ·
Those pics are great! I'll add this to the helpful links section when I get a few more additions (I don't want this thread to be 90% of the same re-posting). Excellent information :D
 

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Discussion Starter · #9 ·
Thanks for making this a sticky.

Unfortunately, I am not able to edit the first post.

Thanks,

Mike
 
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