• Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Mixture screw

thehusk

thehusk

Husqvarna
A Class
So as I had my carb apart a couple months ago I noticed that my aftermarket mixture screw was shorter than my factory one. I also think I remember seeing some else mention this fact on here as well. Anyway So am I correct in thinking that when I have my screw turned the 1 and a half out or what have you, that it is actually further out than the aloted 1.5 turns of a factory screw? If this is the case has someone gone through and made the calculations that state that .5 turns out on a scotts screw is actually 2.5 turns out due to the shortness of it. this would be helpful when trying to guage what pilot jet is needed. Or am I completly way off base here?
 
Logic is fine- I'll confirm your concerns:cheers:

It is fairly well established that aftermarket fuel screws are cut slightly different than the stock Keihin fuel screws- so your end result being different than with the stock fuel screw is likely. However, there is no conversion guide for this in terms of this such as 1 turn =1.5 turns. You may very well need a different pilot jet. I am a bit suprised that you notice a difference visualy from the threads down (to tip) on your extended fuel screw. The Scotts should be a reliable piece being brass by most peoples standards.

Here's a good guide for your Pilot circuit:
:thumbsup:
Eddie Sisneros01-14-2006, 11:52 AM
Seems like the most common jetting issue that comes up are pilot circuit related.the following is a sure method to choose the needed changes.

  • With the bike warm and idleing turn the fuel screw in till the idle drops/misses.then go back out till the idle peaks/smooths.
  • This should happen between 1 and 2.5 turns on a fcr carb
  • If you end up at less than 1 turn you need a smaller pilot jet.more than 2.5 you need a bigger pilot jet.
  • Choose the appropriate size and retest.
 
This has been my experience as well. I use a flex jet screw and my settings are typically 1/8 to 1/4 turn less than the OEM screw at corresponding temps/conditions.
 
Thank you for your posts. I need to get a few carb items anyway maybe I'll include a new fuel screw in my list. Doubt this will promt anyone to make a conversion chart. Again thanks.
 
Ill be working on my carb soon enough. Ill start a thread and document my R&D flexible fuel screw. anyone is welcome to post up what they find on their own afterarket fuel screws.
 
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