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1972 Honda CB450K Two-Carb Synchronizer Connection Checks

Assess this universal synchronizer against the carburetors installed on your 1972 CB450K before ordering. The kit describes two gauges and 5mm-thread extensions in two lengths. Identify suitable vacuum connections and required reach from the fitted equipment rather than assuming the motorcycle year confirms every adapter.

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Logo patch 4 x 1 in. motorcycle garage patch

VintageCB750 Logo Patch ~ 4 x 1 in.

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Show off your VintageCB750 pride with this VintageCB750 Logo Sew-On Patch, featuring metallic red thread. Looks great sewn onto a riding jacket, hat, or...
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750 four engine t-shirt (xl size)

750 Four Engine T-Shirt (XL Size)

$29.95 USD
3/XL
Pay homage to Honda's groundbreaking inline-four with the 750 Four Engine T-Shirt in Extra Large. A black 100% cotton tee featuring a beautifully rendered...
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Universal motorcycle beanie hat toque

Universal Motorcycle Beanie Hat/Toque

$15.95 USD
19-0117
Represent classic Honda style with this Honda Beanie Hat / Toque. Black knit with the classic Honda logo on both sides. One size fits...
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750 four engine t-shirt (large size)

750 Four Engine T-Shirt (Large Size)

$29.95 USD
3/L
Celebrate the iconic SOHC inline-four with the 750 Four Engine T-Shirt in Large. Printed on a quality 100% cotton black tee, the front graphic...
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Red Honda logo hat vintage motorcycle hat

Red Honda Logo Hat

$22.95 USD
61-1132
Add a Red Honda Logo Hat to your gear collection. Velcro adjustable back.Key Features• Red Honda Logo Hat• Velcro adjustable backPart Number: 61-1132
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Blue Honda racing hat vintage motorcycle hat

Blue Honda Racing Hat

$22.95 USD
61-1133
Add a Blue Honda Racing Hat to your gear collection. Velcro adjustable back.Key Features• Blue Honda Racing Hat• Velcro adjustable backPart Number: 61-1133
750 four engine t-shirt (medium size)

750 Four Engine T-Shirt (Medium Size)

$29.95 USD
3/M
Pay tribute to the heart of the CB750 with the 750 Four Engine T-Shirt in Medium. A black 100% cotton tee featuring a beautifully...
Universal motorcycle carburetor synchronizer vacuum gauge 2 carb synchronizer

Universal Motorcycle Carburetor Synchronizer Vacuum Gauge ~ 2 Carb Synchronizer

$54.95 USD
37-0003
Carburetor and throttle body synchronizer kit for bikes with 2 Carbs. Makes synching your carburetor setup fast and easy! For use with Honda, Kawasaki,...
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New
Universal motorcycle face mask

Universal Motorcycle Face Mask

$17.50 USD
13-0005
Keep road debris out of your eyes with this Face Mask with removable goggles. Features air holes in the mouth area and on the...
Established 2010 t-shirt (xl size)

Established 2010 T-Shirt (XL Size)

$26.95 USD
2/-XL
Proudly display your place in the CB750 community with the Established 2010 T-Shirt in X-Large. A black 100% cotton tee featuring the "Established 2010...
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Honda hrc logo trucker hat

Honda HRC Logo Trucker Hat

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Top off your kit with this Honda Logo with HRC Emblem Trucker Hat. High-quality hat with beautifully stitched Honda logo. Snap-on adjustable back.Key Features•...
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White Honda logo hat vintage motorcycle hat

White Honda Logo Hat

$22.95 USD
61-1142
Add a White Honda Logo Hat to your gear collection. Velcro adjustable back.Key Features• White Honda Logo Hat• Velcro adjustable backPart Number: 61-1142
Established 2010 t-shirt (large size)

Established 2010 T-Shirt (Large Size)

$26.95 USD
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Celebrate the CB750 community in this Established 2010 T-Shirt (Large). A black 100% cotton tee featuring the "Established 2010 VintageCB750 Logo" on the front,...
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750 four engine t-shirt (xxl size)

750 Four Engine T-Shirt (XXL Size)

$29.95 USD
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Wear your respect for Honda's legendary four-cylinder on your chest with the 750 Four Engine T-Shirt in XX-Large. A 100% cotton black tee featuring...
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Established 2010 t-shirt (xxl size)

Established 2010 T-Shirt (XXL Size)

$26.95 USD
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Represent the CB750 scene in this Established 2010 T-Shirt (XX-Large). A roomy, soft 100% cotton tee in black with the "Established 2010 VintageCB750 Logo"...
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Universal motorcycle bottle opener vintage garage accessory

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Find a great gift for any motorcycle fan with this Motorcycle Bottle Opener. Sturdy construction with an aged brass look. 5" x 1.5".Key Features•...
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Honda 93 red hat vintage motorcycle hat

Honda 93 Red Hat

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Top off your kit with this Honda 93 Red Hat. High-quality hat with beautifully stitched logos.Key Features• Honda 93 Red Hat• Beautifully stitched logosPart...
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T-shirt (small size)

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$20.59 USD
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Wear your passion for classic Hondas with the VintageCB750 Classic T-Shirt in Small. This 100% cotton tee comes in black with the VintageCB750 logo...
Established 2010 t-shirt (medium size)

Established 2010 T-Shirt (Medium Size)

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Honor the CB750 community in everyday comfort with the Established 2010 T-Shirt in Medium. A black 100% cotton tee carrying the "Established 2010 VintageCB750...
Established 2010 t-shirt (small size)

Established 2010 T-Shirt (Small Size)

$26.95 USD
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Commemorate a decade-plus of CB750 community with the Established 2010 T-Shirt in Small. This black 100% cotton tee carries the "Established 2010 VintageCB750 Logo"...
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Honda Gold Label T-Shirt - Black

Honda Gold Label T-Shirt - Black

$29.95 $27.95 USD
You save $2.00
33/M
A black Honda tee with the Gold Label wing graphic printed on the front. Factory Effex uses a lightweight cotton and polyester blend for...
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1972 Honda CB450K · Tools, Hardware & Other Buying guide

Check the actual vacuum connection before choosing the tool

The kit lists two gauges, a bracket, hoses, damping valves and instructions. Its extensions are stated at 65mm and 180mm with 5mm threads. Those details do not establish suitable ports or complete adapter coverage for every carburetor.

Parts to consider

Universal Motorcycle Carburetor Synchronizer Vacuum Gauge ~ 2 Carb Synchronizer Universal two-carb vacuum synchronizerTwo gauges with bracket, hoses, damping valves and instructions. The description lists 65mm and 180mm extensions with 5mm threads; verify actual connection and adapter needs.View part

Plan the connection from the carburetors actually installed

Identify the fitted carburetors, suitable vacuum access and connection requirements before comparing the kit. The general statement that certain motorcycles typically use 5mm connections does not establish the ports on your particular assembly. Confirm any separate adapters and the reach needed instead of relying solely on the motorcycle application.

Use the tool contents alongside the relevant service information

The gauges, hoses, damping valves and instructions are stated as supplied. Read the tool instructions together with service information for the fitted carburetors to establish the work and other requirements. The universal description is not a model-specific adjustment procedure and does not promise every connection accessory supplied.

Buying questions

What should I establish if the fitted carburetors are replacements?

Identify their suitable vacuum access, connection thread and required extension reach from the actual equipment information. The kit’s universal two-carb description and 5mm-thread extensions do not document every replacement carburetor. Confirm any additional adapters before deciding whether the connection can be made.

Do both extension lengths come with a clearly stated quantity?

The description lists 65mm and 180mm extensions with 5mm threads, without itemizing the number of each length. Confirm those counts if the connection plan depends on matching two particular extensions. Do not derive supplied quantities from the photograph alone.

What supplied equipment supports gauge mounting and needle damping?

The kit lists a mounting bracket and damping valves, alongside two gauges, hoses and instructions. Confirm the mounting arrangement and read the instructions for damping adjustment before use. Those supplied items still leave carburetor connection and extra-adapter requirements to be checked separately.

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