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Yamaha XS650 Mikuni BS34 38 CV Carb Slide Needles, Needle Jets, and Mixture Screws

The air/fuel mixture is the most critical aspect of proper carb tuning — Nothing effects XS650 performance more. Start your Yamaha XS650 carburetor restoration off the right way with a new carburetor mixture screw kit. It includes everything you need to smooth out your mixture. Or, you can get only the parts from the kit that you need. We sell Mikuni VM and CV air adjusting screws, slide needles and preload springs. And you can drastically improve your XS650 café racer performance with a Dyno Tune needle and jet kit from Heiden. For small XS650 mixture adjustments due to elevation and temperature fluctuations, we offer the handy Mikuni Pocket Tuner.

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  1. O-Ring - needle jet (nozzle main) Mikuni BS38 CV carbs
    Part #
    48-5020
    O-Ring - needle jet (nozzle main) - Fits: XS1, XS2, XS650, TX 650's (1970-79) with Stock Mikuni BS38 CV Carbs. If this O-ring is dried out, shrunk or damaged, fuel can pass around the outside of the Needle jet instead of just thru the jets center causing a richer carb fuel mixture. Note: O-Ring appears too small but it... 
  2. Heiden Dyno Tune Needle & Jet Kit for Mikuni BS34 CV carbs
    Part #
    48-0667
    Dyno Tune Needle & Jet Kit for Mikuni BS34 CV carburetors as used on North American model 1980-84 XS650's.Kit smoothes out the powerband and removes the midrange hesitation and leanness resulting in a smooth acceleration from idle thru redline.Kit Contains: 2 slide needles - #7F6, 2 needle clips, 2 pilot jets - #45... 
  3. Fuel Idle Mixture Screw with spring, washer and O-Ring Mikuni BS34 CV carbs
    Part #
    48-5011
    Fuel Idle Mixture Screw with spring, washer and O-Ring - Fits: XS650G/H/SH/SJ/SK/SL (1980-84) with Stock Mikuni BS34 CV Carburetors. See following 48-5012 text. 
  4. Mixture screw Kit - Mixture screw, O-Ring & Blind Plug Washer Mikuni BS34 CV carbs
    Part #
    48-5012
    Mixture screw Kit - Mixture screw, O-Ring & Blind plug washer -Fits: 1980-84 XS650G/H/SH/SJ/SK/SL Stock Mikuni BS34 CV Carbs. Plug covers vertical re-cessed idle mixture screw & keeps out contaminants. O-Ring fits under metal Washer at bottom of mixture screw hole and the engine will not idle properly if it is... 
  5. Mikuni Pocket Tuner
    Part #
    48-8106
    Mikuni Pocket Tuner. A handy pocket-size calculator which can be used to determine required jetting changes in Mikuni carburetors due to climate and temperature changes. The Pocket Tuner is applicable to both single and multi-carb applications on two-stroke and four-stroke engines. It also has a guide for determining r... 
  6. Jet Needle 5IX11 Mikuni BS34 CV carbs
    Part #
    48-0663
    Jet Needle - 5IX11 - Fits:XS650G/H/SH/SJ/SK/SL (1980-84) stock Mikuni BS34 carburetors.CV Carbs (originally used in 1980 Canadian model BS 34 CV carbs).Note the needle clip adjustment grooves.Needle profile is Richer running than 5HX12.Sold each 
  7. Needle Jet 336-Y0 Mikuni BS34 CV carbs
    Part #
    48-0662
    Needle Jet 336-Y0 Fits: XS650G/H/SH/SJ/SK/SL (1980-84) stock Mikuni BS 34 CV Carburetors (originally used in 1980 Canadian model BS 34 CV carbs).Matches Jet Needle - 5IX11 - and provides richer running than standard Y0 type. 
  8. Fuel Idle Mixture Screw - (256 type) Mikuni BS38 CV carbs
    Part #
    48-5008
    Fuel Idle Mixture Screw - (256 type) Fits:XS1/XS1b/XS2/TX650/TX650A/XS650B (1970-75) with Stock Mikuni BS38 CV Carburetors.Beware!Carb idle mixture screw O-Rings included may or may not fit correctly in your Mikuni BS38 CV stock carburetor. The O-Ring in the carb as originally supplied by Mikuni/Yamaha varies in fit... 
  9. Air Pilot Mixture Screw - (584 type) Mikuni BS38 CV carbs
    Part #
    48-5009
    Air Pilot Mixture Screw - (584 type) Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV Carburetors. 
  10. Fuel Idle Mixture Screw with O-Ring Mikuni BS38 CV carbs
    Part #
    48-5010
    Fuel Idle Mixture Screw with O-Ring Fits: XS650E/SE/F/SF/2F(1978-79) Stock Mikuni BS38 CV Carbs. Beware!Carb idle mixture screw O-Rings included may or may not fit correctly in your Mikuni BS38 CV stock carburetor. The O-Ring in the carb as originally supplied by Mikuni/Yamaha varies in fit and size and we have found... 
  11. Mikuni 159 R-0 Needle Jet Mikuni VM
    Part #
    48-8001
    159 R-0 Needle Jet Mikuni VM series carburetors (VM34). The R-0 jet is a richer running jet. On the Mikuni lean to rich chart there are 26 Needle Jets in the 159 series, R-0 is the sixth jet from the richest. The 159 series jets fit VM30-VM36 spigot type carbs. 
  12. Mikuni 159 O-4 Needle Jet Mikuni VM carburetors
    Part #
    48-8003
    159 O-4 Needle Jet Mikuni VM series carburetors (VM34). The O-4 Jet is towards the leaner end of the scale. Between lean and rich it is about 1/3 of the way down from the leanest. The 159 series jets fit VM30-VM36 spigot type carbs. Sold each. 
  13. Mikuni air adjusting screw VM series
    Part #
    48-8051
    Air adjusting screw for Mikuni VM series carburetors VM26-VM44 spigot (we sell VM34). Mikuni # VM20/214. 
  14. Mikuni idle adjusting screw VM series
    Part #
    48-8052
    Idle adjusting screw for Mikuni VM series carburetors VM32-VM34 spigot (we sell VM34 carbs). Mikuni # VM24/224. 
  15. Mikuni idle adjusting screw spring VM series
    Part #
    48-8053
    Idle screw spring for Mikuni VM series carburetors VM26-VM44 spigot (we sell VM34 carbs). Mikuni # M20/221. 
  16. Jet Needle Washer Mikuni BS34 CV
    Part #
    48-0770
    Slide Needle WasherWasher - Fits under slide needle preload spring and on top of needle & clip on stock BS34 CV Mikuni carbs as used on 1980-84 North American model XS650's. 
  17. Slide Needle Preload Spring Mikuni BS34 CV
    Part #
    48-0669
    Spring - Slide needle preload spring for stock BS34 CV Mikuni carbs as used on 1980-84 North American model XS650's. OEM Ref.# 3F7-14589-00-00This spring holds the slide needle down in place in the carb slide. 
  18. Slide Needle Clip Mikuni BS34 BS38 carbs
    Part #
    48-0668
    Carb Slide Needle Clip (pk./2) - Fits: Slide Needles on 1974-84 650's with stock Mikuni BS34/38 CV Carbs. 
  19. Slide (Jet) Needle - 4JN19 Mikuni BS38 CV carburetors
    Part #
    48-0653
    Slide (Jet) Needle - 4JN19 - Fits: XS1/XS1b/XS2/TX650 (1970-73) Stock Mikuni BS38 CV Carbs. 
  20. Needle Jet - Z6 Mikuni BS38 CV carburetors
    Part #
    48-0654
    Needle Jet - Z-6 long - Fits: XS1/XS1b/XS2/TX650/A/XS650B (1970-73) Stock Mikuni BS38 CV Carbs. 
  21. Slide (Jet) Needle - 4N8 Mikuni BS38 CV carburetors
    Part #
    48-0655
    Slide (Jet) Needle - 4N8 - Fits: TX650A/XS650B (1974-75) Stock Mikuni BS38 CV Carbs.46mm needle 
  22. Needle Jet - Z 8 Mikuni BS38 CV carburetors
    Part #
    48-0656
    Needle Jet - Z 8 - Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV Carbs. 
  23. Slide (Jet) Needle - 4M1 Mikuni BS38 CV carburetors
    Part #
    48-0657
    Slide (Jet) Needle - 4M1 - Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV -Carbs. 
  24. Needle Jet - Z 2 Mikuni BS38 CV carburetors
    Part #
    48-0658
    Needle Jet - Z 2 - Fits: XS650E/SE(1978), XS650F/SF/2F(1979) Stock Mikuni BS38 CV carbs. 
  25. Slide (Jet) Needle - 502 Mikuni BS38 CV carburetors
    Part #
    48-0659
    Slide (Jet) Needle - 502 - Fits: XS650E/SE(1978), XS650F/SF/2F(1979) Stock Mikuni BS38 CV Carbs. 
  26. Needle Jet - Y-O Mikuni BS34 CV carbs
    Part #
    48-0660
    Needle Jet - Y-O - Fits: XS650G/H/SH/SJ/SK/SL (1980-84) Stock Mikuni BS34 CV Carburetors. 
  27. Carb Rubber Passage Plug (4)
    Part #
    100-1325
    Equivalent to OEM: 13357-44080 3F7-14991-00-00  Sold IndividuallyFits Suzuki GN125Z/D/EN/EP/ER/ES GN400T/XT/XX/TX/TZ SP400T GS450ED/GAZ/GAD/GAF/LD/LF/LG/LH/LJ/TXD GS550ET/LT/LX/LZ/MZ/TX GS650EX/EZ/GX/GZ/GD/GLX/GLZ/GLD/MD GS700EF/ESF GS750ET/EX/EZ/ES/ESD/LT/LX/SD/TZ/TD GS850GT/GX/GZ/GD/GLT/GLX/GLZ/GLD G... 
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