Road Star Forum
Welcome, Guest
Please Login or Register.    Lost Password?
Go to bottom Post Reply Favoured: 0
TOPIC: Re:Carb Cough - Timing Screw
#296
nosleepgeek (User)
Fresh Boarder
Posts: 3
graphgraph
User Offline Click here to see the profile of this user
Re:Carb Cough - Timing Screw 7 Years, 10 Months ago  
Here's a followup to my earlier post...

Found another problem with one of the two carbs I have that will also cause a timing related cough. I'll do my best to explain.
More specifically, I found that even after adjusting the timing cam (backing out the screw) to the most advanced position on the pump cam, the cam could be rotated slightly back and forth without pushing on the pump plunger. In other words, with the throttle fully closed (idle), there was play in the whole throttle plate-to-accel pump mechanism that could not be adjusted out. I carefully compared carbs to each other and could find no reason for the play in the one carb. Sooo...out came the Vicegrips...tweaked the metal arm the cam is mounted to forcing the whole affair to a zero lash relationship...that is, the cam is under spring pressure against the end of actuator arm at all times...no slop, period.

The bottom line is...the actuator arm that inter-connects the throttle plate with the pump cam can not have ANY slop in it. After a 40 mile ride, purposely doing everything I could to make it cough...I couldn't...not even once!

If I get ambitious, I'll redline some of the carb graphics and post 'em to make it easier to understand what I'm talking about.

Yes, Martha! You can have a cough free bike!

--Chris
 
Logged Logged  
  The administrator has disabled public write access.
      Topics Author Date
    thread link
Carb Cough - Timing Screw
nosleepgeek 2004/07/22 19:06
    thread link
thread linkthread link Re:Carb Cough - Timing Screw
DL 2004/07/23 15:29
    thread link
thread linkthread link Re:Carb Cough - Timing Screw
roscoe 2004/07/27 16:44
    thread link
thread linkthread linkthread link Re:Carb Cough - Timing Screw
nosleepgeek 2004/07/28 05:42
    thread link
thread linkthread link Re:Carb Cough - Timing Screw
nosleepgeek 2004/07/28 05:48
Go to top Post Reply
Powered by FireBoardget the latest posts directly to your desktop
...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... ...................................................................... -->
New Forum Posts




The Road Star Clinic is a collaborative community of riders who archive and publish user contributed technical data about Yamaha Road Star motorcycles.

We also sponsor the creation and support of other community websites similar to our own. Inquiries about availability of a website for your community can be submitted to us via any "Contact Us" option on the Clinic.

Copyright 2003-2007 Road Star Clinic and its respective authors. Road Star Clinic is sponsored by the folks at MLSHomeQuest.com.