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

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

The air/fuel mixture is the most critical aspect of proper carburetor tuning — Nothing effects motorcycle performance more. Start your Yamaha carb 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 XS café racer performance with a Dyno Tune needle and jet kit from Heiden. For small mixture adjustments due to elevation and temperature fluctuations, we offer the handy Mikuni Pocket Tuner.

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  1. Float Needle Valve Assembly XV920 XJ750
    Part #
    200-3004
    Equivalent to OEM: 10L-14390-02-00 - Float Needle Valve Assembly - Fits Yamaha XJ650G/H/J/K/LH//RJ- XJ700N/NC/S/SC- XV700L/LC/N/NC/CS/CSC/CT/CTC/SS/SSC- XJ750J/K/MK/RH/RJ/RK- XV750H/J/K/MK- XV920J/K/MK/RH/RJ- XV1000L/LC/N/NC- XV1100S/SC/T/TC. 
  2. O-Ring - Needle Jet - XS1 XS2 TX650 XS650 1970-1979
    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... 
  3. Screw - Fuel Mixture - Blind Plug Washer - XS650 - 1980-1984
    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... 
  4. Screw - Fuel Mixture w/Spring and Washer - XS650 1980-1984
    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. 
  5. Carburetor Kit - XS650 - 1980-1984 - Premium Heiden Dyno Tune
    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... 
  6. Float Needle Valve Assembly - RD250 - RD350 - RD400 - XS1B
    Part #
    44-4810
    Float Needle Valve Assembly . Equivalent to OEM: 16030-017 16030-019 16030-025 23L-14107-25-002.5 Float Needle Valve Assembly found on Mikuni VM24- VM26 and VM28 carbs Fits Kawasaki Z1 KZ900 KZ1000 (77-80) KZ650 (77-81) Fits Yamaha TA-125, RD250 1973-75, RD350 1973-75 (OEM ), RD400 76-79, XS1B 1971... 
  7. Pocket Tuner - Mikuni
    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... 
  8. Jet Needle - 5IX11 - XS650 1980-1984
    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 
  9. Needle Jet - 336-Y0 - XS650 1980-1984
    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. 
  10. Screw Spring - Idle Adjusting - Mikuni - VM Series
    Part #
    48-8053
    Idle screw spring for Mikuni VM series carburetors VM26-VM44 spigot (we sell VM34 carbs). Mikuni # M20/221. 
  11. Pilot Air Screw - Mikuni - VM Series
    Part #
    48-8052
    Idle adjusting screw for Mikuni VM series carburetors VM32-VM34 spigot (we sell VM34 carbs). Mikuni # VM24/224. 
  12. Pilot Air Screw - Mikuni - VM series
    Part #
    48-8051
    Air adjusting screw for Mikuni VM series carburetors VM26-VM44 spigot (we sell VM34). Mikuni # VM20/214. 
  13. Needle Jet - 159 O-4 - VM34
    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. 
  14. Needle Jet - 159 R-0 - VM34 - Mikuni
    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. 
  15. Screw - Fuel Mixture - XS650 - 1978-1979
    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... 
  16. Screw - Fuel Mixture - XS650 - 1976-1977
    Part #
    48-5009
    Air Pilot Mixture Screw - (584 type) Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV Carburetors. 
  17. Screw - Fuel Mixture - XS1 - XS2 - TX650 - XS650 - 1970-1975
    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... 
  18. Washer - Jet Needle - XS650 1980-1984
    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. 
  19. Preload Spring - Slide Needle - XS650 1980-1984
    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. 
  20. Clip - Slide Needle - Carburetor - XS650 1974-1984
    Part #
    48-0668
    Carb Slide Needle Clip (pk./2) - Fits: Slide Needles on 1974-84 650's with stock Mikuni BS34/38 CV Carbs. 
  21. Needle Jet - Y-O - XS650 1980-1984
    Part #
    48-0660
    Needle Jet - Y-O - Fits: XS650G/H/SH/SJ/SK/SL (1980-84) Stock Mikuni BS34 CV Carburetors. 
  22. Jet Needle - 5O2 - XS650 1978-1979
    Part #
    48-0659
    Slide (Jet) Needle - 502 - Fits: XS650E/SE(1978), XS650F/SF/2F(1979) Stock Mikuni BS38 CV Carbs. 
  23. Needle Jet - Z2 - XS650 1978-1979
    Part #
    48-0658
    Needle Jet - Z 2 - Fits: XS650E/SE(1978), XS650F/SF/2F(1979) Stock Mikuni BS38 CV carbs. 
  24. Jet Needle - 4M1 - XS650 1976-1977
    Part #
    48-0657
    Slide (Jet) Needle - 4M1 - Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV -Carbs. 
  25. Needle Jet - Z8 - XS650 1976-1977
    Part #
    48-0656
    Needle Jet - Z 8 - Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV Carbs. 
  26. Jet Needle - 4N8 - TX650 XS650 1974-1975
    Part #
    48-0655
    Slide (Jet) Needle - 4N8 - Fits: TX650A/XS650B (1974-75) Stock Mikuni BS38 CV Carbs.46mm needle 
  27. Needle Jet - Z6 - XS1 XS2 TX650 XS650 1970-1973
    Part #
    48-0654
    Needle Jet - Z-6 long - Fits: XS1/XS1b/XS2/TX650/A/XS650B (1970-73) Stock Mikuni BS38 CV Carbs. 
  28. Jet Needle - 4JN19 - XS1 XS2 TX650 1970-1973
    Part #
    48-0653
    Slide (Jet) Needle - 4JN19 - Fits: XS1/XS1b/XS2/TX650 (1970-73) Stock Mikuni BS38 CV Carbs. 
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