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R5 / RD250 / RD350 / RD400 Fuel System

Fuel System

The air-fuel ratio that keeps your vintage Yamaha RD café racer running as good as it looks is delicate, and it doesn’t take much to disrupt it. Mikes XS carries RD250, RD350 and RD400 carb repair kits that will help restore your vintage Yamaha carburetors to peak performance. We also sell the float bowl gaskets, float needles, main jets and float valves separately. For a complete fuel system overhaul, replace that aging RD350 petcock with one our brand-new, non-vacuum-type models. 

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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. Needle Valve Assembly Yamaha 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... 
  3. Carb Float Valve (Needle & Seat) Mukuni BS38 CV carbs
    Part #
    48-5019
    Carb Float Valve (Needle & Seat) - threaded type. Fits: XS2 (1972), TX650/A (1973-74), XS650B-F (1975-79) with stock Mikuni BS38 CV CarburetorsAlso fits:RD250 (DS6) and RD350 (R5) 70-72 OEM 168-14190-20-00, XS500 C/D 76-77, TX750A 73-74, XS1100 78-79 
  4. 2 into 1 Throttle Cable for after market carburetors.
    Part #
    48-9150
    High quality Japanese 2 into 1 throttle cable made for our XS Performance PWK carburetor. Motion Pro style cable with slimmer, rectangular shaped junction box. Can be used with aftermarket carbs from Keihin (PWK). Total length is 46" tip to tip.Exposed cable part is 2"Part 51-9111 can be used when modifying rubber shea... 
  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. Float Needle XS360 XS400 XS650 XS750 XS1100 +
    Part #
    40-4810
    Float Needle Valve Assembly: Fits: XS360 1976-77, XS400 1977-79, RD400 77 (OEM 1J7-14190-20-00), XT500 76-79 and 88, XS650 77-80, XS750 77-79, XS1100 78-79, RD250 LC 82, RD350 LC 82 2.0mm opening. Thread diameter = 10mm thread pitch = 1.0mm. Equivalent to Mikuni OEM: N122.032. These also fit VM29 VM33 Mikuni 29... 
  7. Petcock - Yamaha RD250/350LC, RD400
    Part #
    44-2035
    Petcock, non-vacuum fuel valve.Fits:RD400 1976-1980. RD250/350LC 1980-1982Center to center hole is 34mm 
  8. Float Bowl Gasket Yamaha  RD250 RD350 RD400
    Part #
    44-2040
    Float Bowl Gasket RD 250 and RD350 1973-75, RD400 1976-79.OEM reference # 360-14184-01-00 
  9. Carburetor Kit Yamaha RD350 1973-1975
    Part #
    44-4820
    Carb Repair Kit Yamaha RD350 1973-75 
  10. Carburetor Kit Yamaha RD400 1976-1978
    Part #
    44-4821
    Carburetor Repair Kit RD400 76-78 
  11. Carburetor Kit Yamaha RD250 RD350 YPVS 1983-1985
    Part #
    44-4822
    Carburetor Repair Kit RD250/350 YPVS 83-85 
  12. #200 Main Jet - Large Hex Type for Mikuni carbs
    Part #
    48-0323
    #200 Main Jet - Large Hex Type - 4/042 Mikuni - Fits: Mikuni VM Roundslide aftermarket carburetors and most Mikuni TM Flatslide Carbs. Sold in 2's 
  13. Petcock - Yamaha RD250,RD350,R5,DS6,DS7
    Part #
    20-0200
    Yamaha Vintage Petcock, 360-24500-00-00 Includes all seals and mounting hardware Applications: Replaces original part numbers 168-24500-02-00 or 360-24500-00-00 Yamaha RD250, RD350 73'-75' Yamaha RD125, RD200 74'-76' Yamaha R5, DS7  70'-72' Yamaha YR1, YR2, YR3 67'-69' Yamaha YCS1, YCS1C 68' Yamaha YDS6 69'-70' Ya... 
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