Road Star Forum
Welcome, Guest
Please Login or Register.    Lost Password?
Go to bottom Post Reply Favoured: 0
TOPIC: Re:Tuning Woes: Cam, not Carb
#1019654
SKWEARpeg (User)
Platinum Boarder
Posts: 12864
graphgraph
User Online Now Click here to see the profile of this user
Gender: Male Location: Milton, Florida Birthdate: 1958-00-00
Re:Tuning Woes: Cam, not Carb 4 Months ago  
The idle needs to be at about 900rpms. If it's not there, turn it up. These bikes will idle as low as 600rpms when they're hot. Resist the temptation to think its okay. There's a 45 pound crank buried inside the motor. When the idle is set correctly, it is always making forward progress. You turn the idle to low, and the crank starts more of a jerky motion. Maybe you want that, but I wouldn't. It causes premature wear of lots of important stuff...of which egos are not one of.

My thought is they used the 42, because a 40 is plenty big for the motor. A 45 is actually on the big side for these bikes. There's only so much air you can suck into a cylinder(s). You want the correct air fuel mix. If you go to big on the carb...ie a 45, you're moving more air, and would need to compensate with extra fuel to avoid being lean, especially at the top end as far as speeds and WOT when your moving the most air. These carbs a re a simple afair, and they are constantly struggling for a compromise.
 
Logged Logged  
 
  The administrator has disabled public write access.
      Topics Author Date
    thread link
Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/12 10:32
    thread link
thread linkthread link Re:Tuning Woes: Cam, not Carb
SKWEARpeg 2017/08/12 12:56
    thread link
thread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
dave377 2017/08/13 10:36
    thread link
thread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Ctkog 2017/08/13 11:11
    thread link
thread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/13 11:54
    thread link
thread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
pastornj 2017/08/13 14:44
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/13 14:50
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/13 16:05
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/13 16:08
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
jd750ace 2017/08/13 16:40
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/14 00:04
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
texasscott1 2017/08/14 12:15
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/14 13:53
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
pastornj 2017/08/14 15:34
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/14 15:59
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
pastornj 2017/08/14 18:51
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
Bradspeedstar 2017/08/14 19:33
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
texasscott1 2017/08/15 09:36
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
pastornj 2017/08/14 09:29
    thread link
thread linkthread linkthread linkthread linkthread linkthread linkthread linkthread link Re:Tuning Woes: Cam, not Carb
pastornj 2017/08/14 09:25
    thread link
thread linkthread link Re:Tuning Woes: Cam, not Carb
Curt 2017/08/13 16:32
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.