Carb shim mod
08-20-2006, 02:38 PM
#1
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Squid
Thread Starter
Join Date: May 2006
Location: Bristol, CT
Posts: 8
Carb shim mod
Hey gang-
I have done a search for the shim mod, but have only stumbled across one or two quick rundowns on how to do it. My question is this...When you pull the needle out, the .020" shim goes underneath the small washer at the bottom of the needle, that is, the end that goes into the needle jet. Does that sound right? How easy is it to get the small washer out? And is it fairly easy to press it back in? Any help will be appreciated.
I have done a search for the shim mod, but have only stumbled across one or two quick rundowns on how to do it. My question is this...When you pull the needle out, the .020" shim goes underneath the small washer at the bottom of the needle, that is, the end that goes into the needle jet. Does that sound right? How easy is it to get the small washer out? And is it fairly easy to press it back in? Any help will be appreciated.
08-20-2006, 03:17 PM
#2
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Squid
Join Date: Apr 2006
Posts: 32
That washer happens to be 20 thou in my 05 unit. another .020 made all the difference in how it ran. (stock unit) I am very happy the overall improvement.
It's easy to fit both back together. The slide spring in another thing altogether. LOL
Scott
It's easy to fit both back together. The slide spring in another thing altogether. LOL
Scott
08-20-2006, 04:05 PM
#3
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MotoGP
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Location: South Texas
Posts: 2,553
You have it right. It's a circlip type washer. I pressed a flat blade screwdriver against it to remove/insert it. WATCH OUT: it can or will go flying if you aren't careful and will be almost impossible to find. BTDT. Do it over a big clean towel to catch it.
Great cheap mod for stock bikes (my favorite kind).
Great cheap mod for stock bikes (my favorite kind).
08-20-2006, 06:31 PM
#4
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World Champion
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The stock needles don't have a circlip. It's just a head, like a nail, with a washer under it. The additional washers go under the head, in other words slide the washers down the needle. With bafflectomized pipes you will want to add several washers, for a total of 0.060". Just to clarify: There is a retaining dealio in the slide with a threaded hole in it. You take one of the bowl screw and pull that plastic retainer out. Then the needle and washer will come out. Add washers. Spray little o-ring on the retainer with some WD-40 or something and reassemble.
08-21-2006, 08:55 PM
#7
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Join Date: Dec 2004
Location: Olympia, WA
Posts: 225
You may want to think about adding more washers as described in Hawkriders post... His advise was with the "bafflectomized" (or opened) stock mufflers. I'm shure your aftermarket mufflers flow even better... May save you a couple of trips into the carbs. 
08-27-2006, 04:24 PM
#10
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SuperBike
Join Date: Sep 2005
Location: Buffalo, NY
Posts: 1,572
What diameter washers work well for this mod? Something standard size (and .020 thick) from a hardware store work? I haven't had the carbs apart yet so I haven't seen the size of the needle or any stock washers.
Thanks
Thanks
08-29-2006, 05:43 AM
#12
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SuperBike
Join Date: Sep 2005
Location: Buffalo, NY
Posts: 1,572
Thanks for the info, I picked up some .026 brass washers at the hardware store last night. As I was putting the bike back together the rain started 
Originally Posted by killer5280
I have used #4 brass washers for this purpose. The ones at my local hardware store are .030" thick.
11-15-2009, 08:53 PM
#14
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11-18-2009, 08:12 AM
#17
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MotoGP
Join Date: Aug 2006
Location: altoona, pa
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I did the .40 shim (hawkrider recommended a while back) and set the air mixture at 2.25 turns out(also Hawkrider recommended), TPS 500, foam filter, cut airbox flap flush with top of filter, and the color of the pipes is perfect and it runs strong through the entire rpm range.
11-24-2009, 05:14 AM
#20
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MotoGP
Join Date: Aug 2006
Location: altoona, pa
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the color of the pipes can be an indicator of how rich or lean your engine is metabolizing fuel. Similar to looking at your plugs. Google spark plugs color fuel and you'll find that color can vary from white to grey to brown to black, the lighter being lean condition while black indicates too rich.
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