Heiden Dyno Tune Needle & Jet Kit

Product Photo
Dyno Tune Needle & Jet Kit.

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 with clips, 2 pilot jets, 4 main jets (2 sizes),
1 Drill bit to modify slide, Instructions for tuning with various Exhaust &
Carb/Intake setups.

Fits: Mikuni BS34 CV Carbs as used on North American model 1980-84 XS650's.
Part #48-0667
$39.95 CAD Kit
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Slide (Jet) Needle - 4JN19

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Slide (Jet) Needle - 4JN19.

Fits: XS1/XS1b/XS2/TX650 (1970-73) Stock Mikuni BS38 CV Carbs.
Part #48-0653
$8.95 CAD Ea
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Needle Jet - Z6

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Needle Jet - Z6.

Fits: XS1/XS1b/XS2/TX650/A/XS650B (1970-75) Stock Mikuni BS38 CV Carbs.
Part #48-0654
$16.95 CAD Ea
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Slide (Jet) Needle - 4N8

Product Photo
Slide (Jet) Needle - 4N8.

Fits: TX650A/XS650B (1974-75) Stock Mikuni BS38 CV Carbs.
Part #48-0655
$8.95 CAD Ea
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Needle Jet - Z 8

Product Photo
Needle Jet - Z 8.

Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV Carbs.
Part #48-0656
$16.95 CAD Ea
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Slide (Jet) Needle - 4M1

Product Photo
Slide (Jet) Needle - 4M1.

Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV - Carbs.
Part #48-0657
$8.95 CAD Ea
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Needle Jet - Z 2

Product Photo
Needle Jet - Z 2.

Fits: XS650E/SE(1978), XS650F/SF/2F(1979) Stock Mikuni BS38 CV carbs.
Part #48-0658
$16.95 CAD Ea
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Slide (Jet) Needle - 502

Product Photo
Slide (Jet) Needle - 502.

Fits: XS650E/SE(1978), XS650F/SF/2F(1979) Stock Mikuni BS38 CV Carbs.
Part #48-0659
$8.95 CAD Ea
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Needle Jet - Y-O

Product Photo
Needle Jet - Y-O

Fits: XS650G/H/SH/SJ/SK/SL (1980-84) Stock Mikuni BS34 CV Carbs.
Part #48-0660
$16.95 CAD Ea
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Jet Needle 5IX11

Product Photo
Jet Needle - 5IX11.

Fits:XS650G/H/SH/SJ/SK/SL (1980-84) stock Mikuni BS34 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.
Part #48-0663
$10.95 CAD Ea
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Needle Jet 336-Y0

Product Photo
Needle Jet 336-Y0.

Fits: XS650G/H/SH/SJ/SK/SL (1980-84) stock Mikuni BS 34
CV Carbs (Originally used in 1980 Canadian model BS 34 CV carbs).

Matches Jet Needle - 5IX11 - and provides richer running than standard Y0 type.
Part #48-0662
$18.95 CAD Ea
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Slide Needle Preload Spring

Product Photo
Spring - Slide Needle Preload Spring. OEM Ref.# 3F7-14589-00-00.

Fits: Stock BS34 CV Mikuni Carbs as used on 1980-84 North American model XS650's.

This spring holds the slide needle down in place in the carb slide.
Part #48-0669
$4.95 CAD Ea
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Slide Needle Clip

Product Photo
Carb Slide Needle Clip (Pk/2).

Fits: Slide Needles on 1974-84 650's with Stock Mikuni BS34/38 CV Carbs.
Part #48-0668
$1.95 CAD Pk/2
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Jet Needle Washer

Product Photo
Slide Needle Washer

Washer - 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.
Part #48-0770
$1.95 CAD Pr.
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O-Ring - Needle Jet (Nozzle Main)

Product Photo
O-Ring - Needle Jet (Nozzle Main).

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.

Fits: XS/TX 650's (1970-79) with Stock Mikuni BS38 CV Carbs.

Note: O-Ring appears too small but it is correct, install by carefully stretching
with pointy needle nose pliers until it just fits over the jet.
Part #48-5020
$2.25 CAD Ea
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Fuel Idle Mixture Screw - (256 type)

Product Photo
Fuel Idle Mixture Screw - (256 type).

Fits: XS1/XS1b/XS2/TX650/TX650A/XS650B (1970-75) with Stock Mikuni BS38 CV Carbs.
Part #48-5008
$5.95 CAD Ea
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Fuel Idle Mixture Screw - (584 type)

Product Photo
Fuel Idle Mixture Screw - (584 type).

Fits: XS650C/D (1976-77) Stock Mikuni BS38 CV Carbs.
Part #48-5009
$6.95 CAD Ea
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Fuel Idle Mixture Screw with O-Ring

Product Photo
Fuel Idle Mixture Screw with O-Ring.

Fits: XS650E/SE/F/SF/2F(1978-79) Stock Mikuni BS38 CV Carbs.

Note!
Carb idle mixture screw O-Rings included may or may not fit correctly in your
Mikuni BS38 CV stock carb. The O-Ring in the carb as originally supplied by
Mikuni/Yamaha varies in fit and size and we have found it impossible to match
or guarantee a proper fit. No alternatives can or will be supplied. The mixture
screw and matching O-ring was never sold or supplied by Yamaha or Mikuni.
Part #48-5010
$7.95 CAD Ea
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Fuel Idle Mixture Screw with Spring, Washer and O-Ring

Product Photo
Fuel Idle Mixture Screw with Spring, Washer and O-Ring.

Fits: XS650G/H/SH/SJ/SK/SL (1980-84) with Stock Mikuni BS34 CV Carbs.

See following 48-5012 text.
Part #48-5011
$11.95 CAD Ea
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Mixture Screw Kit - Mixture Screw Washer, O-Ring & Blind Plug

Product Photo
Mixture Screw Kit - Mixture Screw, Mixture Screw Rubber O-Ring, Blind Plug Washer, Spring and Washer. (Includes All Contents Shown)

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 not present - (O-ring is often disintegrated).
These parts are not shown in service & parts listings as Yamaha did not want
"emissions" related parts accessed, however adjustments were often necessary
to get New bikes to run properly.

Suggested setting position of the normally hidden mixture screw is 2 1/2 to 3
turns out from bottom.
Part #48-5012
$11.95 CAD Kit
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Aluminum Fuel Pipe Tee

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Aluminum Carb Fuel Line T-Piece & Rubber O-rings (4) - (Fuel supply T pipe
that fits between carbs).

Replaces plastic coated pot metal stock fuel tee that fits between stock Mikuni
BS 34mm CV carbs used on North American Market 1980-84 XS650's.

Fits: XS650 80-84 34mm CV carbs - 9mm (Approximately 3/8")

Note: Carbs will have to be detached from each other to install and we suggest
you replace the link bar screws that join the 2 carbs together as the originals are
usually difficult to remove without.
Part #200-1018
$18.95 CAD Ea
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