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Yamaha XS650 Fuel System Parts

Fuel System

Clogged XS650 carb jets and needles cause poor performance and annoying backfiring while down shifting and engine braking. Mikes XS stocks brand new XS650 main jets, floats and float needles, carburetor spacers, O-rings and more for Dellorto, PWK, Mikuni and Keihin carburetors.

Old worn out carb boots can cause similar performance issues, but they are often overlooked. If your issues persist, check your XS650 carb holders for checking and cracking. If there is an issue, replace them with a new set of XS650 carb boots from Mikes XS. We can also provide XS650 fuel filters, fuel hoses, performance pod air filters, and billet aluminum intake manifolds.

Mikes XS is also a great source for XS650 petcocks, fuel valves, fuel caps and gas cap rubber seals, and we stock petcock rebuild kits as well. And if your acceleration is starting to glitch out, try renewing the throttle cable. We have Mikuni and PWK-type XS650 throttle cables and extended throttle cables, as well as throttle sleeves, universal grips and vintage-grip throttle assemblies. If it makes an XS650 go, Mikes XS probably has one.

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  1. Auxiliary Gas Tank
    Part #
    TU03-1500
    This impact resistant- graduated tank takes the place of the original gas tank while performing carb synchronizing. Includes four feet of 1/4" fuel line and brass petcock. Suggestion: look for a used hospital or doctors office IV stand.  These come with 4 or 5 wheels on a weighted base, telescoping stand, and cur... 
  2. Air Filter - 57mm. XS Performance Pod Air Filter - Mikuni VM34
    Part #
    15-0027
    Sold individually.  57mm. (2 1/4") XS Performance motorcycle Pod Air Filter - Tapered Oval style w chrome end cap. Pod is an improved replica (dyno and flow bench developed) of the most popular brand on the market.Features - Molded in internal velocity stack. - No step rubber mount flange and chrome end cap.Filter... 
  3. Air Filter - 54mm. XS performance Pod Air Filter - Mikuni BS34 CV
    Part #
    15-0035
    Premium quality 54mm. motorcycle Pod Air Filter - Tapered Oval style with Chrome end cap. (2.75") deep x 74 mm. (2.91") wide x 85 mm. (3 3/8") high (at base). Pod is an improved replica (Dyno & flow bench developed) of the most popular brand on the market. Features molded in internal stack, no step rubber mount... 
  4. Petcock Rebuild kit 1973-77 XS650
    Part #
    20-0014
    Petcock Rebuild kit. These petcocks have a 3 Screw Rear cover plate.Fits: TX650/A 1973-74, XS650B/C/D 1975-77Kit contains: 1pc. Valve Rubber, 1pc. Wave Washer, 1pc. Tap to tank O-Ring, 2pc. Tank bolt Washer, 1pc. Drain screw Gasket, 1 pc. Rear cover Gasket ( 3 Screw type ). 
  5. Petcock - Non Vacuum type 1978 - 1983 XS650
    Part #
    20-0019
    Non-vacuum type to replace original vacuum type. Designed to fit all 1978 – 1983 North American market XS650’s. The original petcocks were vacuum operated with a hose connected to an inlet located on the intake manifold. The 1978 and ’79 models have a left and right side valve. The 1980 – &rsquo... 
  6. Petcock - Left Hand OEM type 1970-77 XS650
    Part #
    20-0050
    Petcock - Left Hand.- Original Non-Vacuum Manual type - (3 screw rear cover) Replaces All original Left non-Vacuum types used on 1970-77 Yamaha XS1 XS2 XS650's. Holes are 42.5mm apart.Includes: Tap to Tank O-Ring. This petcock will not fit 64-7700 gas tank. 
  7. Petcock - Right Hand OEM type 1970-77 XS650
    Part #
    20-0051
    Petcock - Right Hand - Original Non-Vacuum Manual type - (3 screw rear cover) Replaces All original Right non-Vacuum types used on 1970-77 Yamaha XS1 XS2 XS650's Holes are 42.5mm apart Includes: Tap to Tank O-RingThis petcock will not fit 64-7700 gas tank. 
  8. Carburetor Kit Yamaha XS650 1980-1984
    Part #
    48-1408
    Carburetor Rebuild Kit - Fits: XS650SG-SL (1980-84) stock Mikuni 34mm. CV carburetors Kit Contains : Push-in Float Valve assembly with O-Ring, Carb rubber passage Plug & Float bowl Gasket 3F7. Made in Japan - 1 kit required per carb.Also works for: XS400 SE '82, XS1100 SG '80, XS1100 LG/LH/SH '80-'81 
  9. Carburetor Kit Yamaha XS650 1978-1979
    Part #
    48-7879
    Carb Rebuild Kit - Fits: XS650E/SE/F/SF/2F (1978-79). Kit contains: 8 hole choke body Gasket, Float Bowl Gasket 256, Float Valve Assy. 2.0 with washer, Pilot Jet #27.5 VM22/210 type, #135 Small Round Main Jet N102/221, Pilot Air Mixture Screw with O-Ring and spring, Choke plunger and Washer for float bowl main jet acce... 
  10. XS Performance Carb kit XS650 **ASSEMBLED**
    Part #
    48-9000
    XS Performance Carb XS650! ** ASSEMBLED KIT **Here is your option to buy a completely Assembled Kit.Please check Item # 48-9001 for Unassembled Kit with all the parts listed if you prefer to do it yourself.Our Carbs were Dyno tested and tuned for XS650's.A replacement for the 1980 to 84 stock Mikuni BS34 Carbs or your... 
  11. XS Performance Carb XS650 ** UNASSEMBLED KIT **
    Part #
    48-9001
    XS Performance Carb XS650! ** UNASSEMBLED KIT **32mm Flatslide Carb Set - Includes: Right & Left Carbs, Manifold Gaskets (#18-0865), Carb holder screws (#49-0741), 2 into 1 Throttle Cable (#48-9046), Billet Aluminum Intake Manifolds, Rubber Hose, 49mm Band clamp (#15-0685), 67mm Band Clamps (#15-0686), Fuel Line Fi... 
  12. Gas Cap with keys 1978-84 XS650 Special and more
    Part #
    20-0034
    Fits: 1978-84 Yamaha XS650 "Specials" Note: Caps from "Standards" and "Specials" do not interchange.Will work with other Specials models: XS400 Specials, XS750 Specials, XS850 Specials, XS1100 Specials, and SR500 78-79 (latch depth adjusted)OEM reference #4R0-24602-01-00 
  13. Reed type PVC Valve
    Part #
    15-0677
    Reed type Positive crankcase ventilation Valve.Valve hooks to engine top breather vent and allows expelled air out but reed prevents air re-entering quickly so a very small vacuum is created in the crankcase. A small power increase has been noted during dyno tests (most notable on pre 77 engines) and the crankcase vacu... 
  14. Gasket (Pk./2.) - Intake Spigot XS650
    Part #
    18-0865
    Gasket (Pk./2.) - Intake Spigot (Carb Holder Rubber) - Fits: 1970-84 650's OEM Ref.# 256-13556-01 j XS1 XS1B XS2 TX650 XS650Fits: Between XS650 Manifolds (Carb Spacers) and cylinder head and between the XS manifolds and the carb holders for the PWK 32.Fits: Keihin Flatslide PWK 32mm. XS Performance Carb Set for XS650.... 
  15. Clear square inline Fuel Filter.
    Part #
    20-0013
    Clear square inline Fuel Filter. 
  16. Petcock Mount O-Ring 1970-77 XS650
    Part #
    20-0015
    Petcock Mount O-Ring - (Tap to Tank O-Ring) Fits: Petcocks on 1970-77 650's 
  17. Tap to tank Mount Screws
    Part #
    20-0020
    Tap to tank Mount Screws(2), Sealing Washers(2) and metal washers (2)Fits: All XS650's 1970-84. 
  18. Gas cap Rubber Seal 1976-84 XS650
    Part #
    20-0036
    Gas cap Rubber Seal - Fits: All 1976-84 XS650 gas caps. OEM: 2MO-24641-00 
  19. Petcock Rebuild kit 1970-72 XS1 XS1b XS2
    Part #
    20-0049
    Petcock Rebuild kit. These petcocks have a 2 Screw Rear cover plate.Fits: XS1/XS1B/XS2 1970-72 Kit contains: 1pc. Valve Rubber, 1pc. Wave Washer, 1pc. Tap to tank O-Ring, 2pc. Tank bolt Washer, 1pc. Drain screw Gasket, 1 pc.Rear cover Gasket (2 Screw). 
  20. Black Rubber Fuel Line 1/4"
    Part #
    20-4010
    Black Rubber Fuel Line - (original thin wall type) 1/4" ID (6mm.) - 1pc. x 11.5" 
  21. Gasket - Float Bowl 1980-84 stock BS34 Mikuni CV carburetors
    Part #
    20-5020
    Gasket - Float Bowl - Fits: 1980-84 XS650 Stock 34mm. Mikuni CV Carbs. XS650 SE/SF/SG 78-80.Oem Ref.# 3F7-14984-00Also fits: XS400 G/H/SH/SJ 80-82, XS1100 80-81, SR250 80-82, XS750. 
  22. Petcock fuel pipe Filter Set
    Part #
    20-6419
    Petcock fuel pipe Filter Set(2) Fits: Over petcock fuel pipes up inside gas tank.Filter Set - Replacements for #20-0019 petcocks and will also fit 1970-77 XS1 XS2 XS650 stock petcocks.Dimensions: 5mm Inside - 6.7mm Outside - 31.75mm Length.Note - These are our petcocks we sell, not OEM Petcocks 
  23. Brass Carb Float Mikuni BS38 & BS34 CV carburetors 1970 - 1979
    Part #
    20-6500
    Brass Carb Float - Fits: 1970-79 XS/TX650 Stock BS38mm and BS34mm. Mikuni CV Carbs. Minor bending may be needed to align properly.Also fits: XS500C (76), TX650 A (73-74), TX750 A (73-74), XS1/XS1B/XS2 (70-72), XS650 B/C/D/E/F (75-79), XS650 SE/SF/SG (78-80), XS650 2F (79)Includes Float and pinOEM Ref.# 256-14985-00 
  24. Gasket - Float Bowl Mikuni BS38 CV carburetors
    Part #
    20-7029
    Gasket - Float Bowl - Fits: 1970-79 XS/TX650 Stock 38mm. Mikuni CV Carbs. XS1/XS1B/XS2 70-72.OEM Ref.# 256-14984-00Also fits: XS360 C/D/2D 76-77, XS500 C/D 76-77, TX650 A 73-74, TX750 A 73-74. XS750 D/2D 77 
  25. Carburetor Kit Yamaha XS650C/D 1976-1977
    Part #
    48-1920
    Carburetor Rebuild Kit - Fits: XS650C/D (1976-77) BS38 Mikuni Kit Contains: 8 Hole choke body Gasket, Float bowl Gasket 256, Float Valve assy. 2.0 with washer, Pilot Jet #27.5 VM22/210 type, #135 Small Round Main Jet N102/221, Pilot air Screw and spring, Choke plunger and Washer for float bowl main jet access plug.The... 
  26. 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... 
  27. Throttle Butterfly Shaft Seal Mikuni BS34 and BS38 CV carbs all XS650
    Part #
    48-5021
    Throttle Butterfly Shaft Seal - Pk/2 Fits: Stock Mikuni BS34/BS38 CV Carburetors on all 1970-84 650's. 
  28. Gas Tank Mount Rubber
    Part #
    02-6530
    Gas Tank Mount Rubber - Front - Fits: All 650's 1970-84 
  29. Blind Plug - carburetor rubber passage plug
    Part #
    48-1447
    Blind Plug - Carb Holder Air Barb - OEM Ref.# 1J7-13569-00. Also called carburetor rubber passage plug.Fits: 1978-84 XS650 stock carb holders & blocks off air barbs when vacuum petcocks are replaced with manual type petcocks. Order quantity needed.Also fits: XS1100 80-81Fits: All Mikes XS Carb Holders and Carb Hold... 
  30. Mikuni Large Round Main Jets #115
    Part #
    SIKYM-0201150
    Aftermarket jet manufactured in Japan. Equivalent to N100/604 Mikuni type series round jet with slotted head. Sold Individually Large Round Type - Size = 115.0 - Common jet found on many of the larger motorcycle Mikuni carbs from the 70's and 80's. Fits the following with Mikuni carbs VM22, VM24, VM26, VM28, VM29, VM... 
  31. Mikuni Large Round Main Jets #120
    Part #
    SIKYM-0201200
    Aftermarket jet manufactured in Japan. Equivalent to N100/604 Mikuni type series round jet with slotted head. Sold Individually Large Round Type - Size = 120.0 - Common jet found on many of the larger motorcycle Mikuni carbs from the 70's and 80's. Fits the following with Mikuni carbs VM22, VM24, VM26, VM28, VM29, VM... 
  32. Pilot Jet VM22/210 #17.5
    Part #
    TU42-3175-1
    OEM: VM22/210 Fits Mikuni VM18 CLAMP-ON- VM22 FLANGE- VM26-8074- VM26-34 FLANGE- VM24-44 SPIGOT- TM SERIES TM24- TM38 (NO ACCELERATOR PUMP) EARLY TMS/TMX CARBURETORS VM29 roundslide smoothbore, VM33 roundslide smoothbore, Kawasaki Suzuki Yamaha 2-stoke and some 4 stroke models. Sold Individually 
  33. 54mm (2 1/8") Tapered oval Pod Air Filter
    Part #
    15-0154
    54mm (2 1/8") Tapered oval Pod Air Filter for motorcycles. High quality good looking filter at a great value.Fits: Aftermarket carbs, such as Mikuni, Keihin, and our PWK car kit DOES NOT WORK with stock Mikuni BS34 CV Carbs without cutting the interior lip which blocks the slide lift and carburetor vent holes. We D... 
  34. Air Filter - 533 OEM Type - XS650 (76-79)
    Part #
    15-0653
    Air Filter - Fits: XS650 C/D/E/SE/F/SF/2F 1976-79 - 2 used per bike.OEM Ref.# 533 -14451-00 Made in Japan 
  35. Air Filter - 3G1 OEM Type - XS650 (80-84)
    Part #
    15-0655
    Air Filter - Fits: XS650G-K - All 1980-84 650's - 2 used per bike.OEM Ref.# 3G1-14451 Made in Japan 
  36. Rubber Joint
    $12.93
    Part #
    15-0671
    Rubber Joint - Carb to Air Filter Box - 1Pc. of Air box rubber Joint & 2pc.of Tension Spring - Fits: 1970-79 XS/TX 650's - Carb to air box - right or left side. Each bike requires 2 sets. 54MM 
  37. BS34 Carb Holder Clamp
    Part #
    15-0672
    Carb Holder band Clamp - 49-55 mm. range. Fits carb holders for stock Mikuni BS 34 CV carbs as used on North American 1980-84 XS650's 
  38. BS38 Carb Holder Clamp
    Part #
    15-0673
    Carb Holder band Clamp - 56-61 mm. range. Fits carb holders for stock Mikuni BS 38 CV carbs as used on North American 1970-79 XS/TX650's 
  39. XS650 Billet Aluminum Intake Manifolds TC Bros Choppers
    Part #
    19-0460
    TC Bros XS650 Billet Aluminum Intake Manifolds Get rid of your cracked and leaking rubber intake manifolds and replace them with our super trick CNC machined billet aluminum racing intakes. These are very sturdy and improve flow to your motor. They are perfect when installing aftermarket carbs. Your stock rubber intake... 
  40. Sealing Washers for Tap to Tank Mount Screws
    Part #
    20-0018
    Sealing Washers for Tap to Tank Mount Screws. Fits: Under mount screws on 1970-84 XS650's 
  41. Petcock O-Ring
    Part #
    20-0021
    O-Ring - Replacement Tap To Tank O-Ring for #20-0019 manual petcock 
  42. Fuel Petcock Repair Kit 1979-83 XS650 and more
    Part #
    20-0100
    Kit contains o rings and diaphragms to rebuild one fuel petcock. Does not include plastic diaphragm spacer block.Yamaha XS650 F, 2F, G, H, Special II, Heritage, 78-83.XS400 E, F, 2F, G, H, 78-81, SG/SH Special 80-81 XJ700 N/NC/S Maxim 85-86 XS750 SE after frame 311211 78, XS750SF 79, XS850 80-81 XJ900 83-85 XJ900R SEC... 
  43. Fuel Petcock Repair Kit 1978 XS650 and more
    Part #
    20-0101
    Kit contains o rings and diaphragms to rebuild one fuel petcock. Does not include plastic diaphragm spacer block.Yamaha XS650 E 78XS360 C, D, 2D 76-77 XS400 D 77 SR500 E/F/G/H 78-81 SR500 82-84, 88, 91-93 XS500 E 78 XS750 D/2D/E/F 77-79 XS1100 E/F/G/H 78-81 
  44. Black Rubber Fuel Line 3/16"
    Part #
    20-4009
    Black Rubber Fuel or Vent Line - ( original thin wall type ) 3/16" (4.5mm.) ID x 11.5"Fits: Keihin Flatslide PWK 32mm. XS Performance Carbs for XS650.Note: Each Carb requires 1 pc. to go to each fuel feed (Petcock). 
  45. Wire Hose Clamps 1/4"  Pack of 10
    Part #
    20-4014
    Wire Spring type Hose Clamp. 1/4" (6mm.) inside Diameter size (unexpanded) in packs of 10pc. Suitable for matching small fuel or vent hose. 
  46. Wire Hose Clamps 9mm - Pack of 10
    Part #
    20-4017
    Wire Spring type Hose Clamp. 0.35" (9mm.) inside Diameter size (unexpanded)in packs of 10pc. Best Size to fit Standard XS petcocks using 20-4009/10 black rubber fuel line. 
  47. Carb Slide & Diaphragm Assembly 1980-84 Mikuni BS34 CV carburetors
    Part #
    20-6028
    Carb Slide & Diaphragm Assembly. - Fits: Mikuni BS34 CV Carbs as used on 1980-84 XS650's OEM Ref.# 3F7/3H5-14940 - Mikuni GenuineAlso fits: SR250 Exciter 80-82, XS400 SE 82, XS400 G 80, XS400 H 81, XS400 SH/SJ 81-82, XS400 J 82, XS400 K Maxim 83, XJ900 RK Seca 83, XJ1100 Maxim 82, XS1100 G/H/LG/LG/SG/SH 80-81 
  48. Carb Slide & Diaphragm Assembly 1970-77 Mikuni BS38 CV carburetors
    Part #
    20-6029
    Carb Slide & Diaphragm Assembly. - Fits: Mikuni BS38 CV Carbs as used on 1970-77 XS650 TX 650's OEM Ref.# 256-14940-00 - Mikuni GenuineAlso fits: XS500 C/D 76-77, TX650 73-74 
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