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1984 Honda CB700SC Fuel Tank & Petcock Parts

For the 1984 CB700SC, a loose tank mounting point and a leaking petcock require different parts. Compare the front rubber cushion with the frame support, and the diaphragm repair kit with the fitted fuel valve. A changed tank needs its own fitment check.

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Honda CB front fuel tank rubber cushion 17611-KE8-000

Front Fuel Tank Rubber Cushion ~ Replaces Honda OEM 17611-KE8-000

$5.50 USD
27-5520
This aftermarket front fuel tank rubber cushion replaces Honda OEM 17611-KE8-000 on the listed Honda CB-series applications. It mounts to the frame and supports...
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Honda CB700 CB650 CB550 CB450 fuel petcock repair kit

Honda CB700 / CB650 / CB550 / CB450 Fuel Petcock Repair Kit

$27.95 USD
20-0020
Rebuild your Nighthawk fuel petcock with this Fuel Petcock Repair Kit. Includes a diaphragm, spring, and 2 O-rings.Key Features• Fuel petcock repair kit• Includes...
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1984 Honda CB700SC · Fuel Tank & Petcock Parts Buying guide

Check the vacuum valve while the tank is off

The 1984 CB700SC tank uses front rubber supports and a vacuum-operated fuel valve. Worn mounting rubber and poor fuel flow call for different repairs, but tank removal is a useful time to inspect the supports, fuel line, vacuum connection and strainers together.

Parts to consider

Front Fuel Tank Rubber Cushion ~ Replaces Honda OEM 17611-KE8-000 Aftermarket front tank cushionSold individually; replaces Honda reference 17611-KE8-000 for the listed CB700SC tank mount.View part Honda CB700 / CB650 / CB550 / CB450 Fuel Petcock Repair Kit Fuel-petcock repair kitContains a diaphragm, spring and two O-rings for the listed Nighthawk petcock.View part

Support the tank without confusing cushion types

The featured front cushion is an aftermarket replacement for Honda reference 17611-KE8-000. One is supplied; two renew the left and right front supports on the listed stock arrangement. Inspect the rear mounting area as well. If the tank or frame mounts have changed, match the actual support shape rather than relying on the motorcycle’s original model label.

Test the valve and inspect its strainers

Honda’s diaphragm test checks for shutoff without vacuum and fuel flow with a hand vacuum pump. Restricted flow also calls for strainer inspection. The manual covers the screen in the fuel cup and the strainer at the tank outlet; replacing diaphragm parts does not clean either one. The kit lists a diaphragm, spring and two O-rings, so confirm those contents against the valve being serviced and check for leaks after reassembly.

Buying questions

Should the original petcock pass fuel in ON with no vacuum applied?

In Honda’s disconnected-outlet test it should not. Fuel flowing before vacuum is applied points to a diaphragm problem. Use the manual’s hand-pump procedure in a ventilated work area away from ignition sources, and verify both shutoff and flow after repair.

Can a diaphragm kit cure every fuel-flow restriction?

No. Honda also calls for inspection of the fuel strainers when flow is restricted. Check the cup screen, tank-outlet strainer and fuel line, and identify damage in the valve body. A diaphragm-and-seal kit neither replaces a damaged housing nor clears contaminated screens by itself.

Why inspect the hoses after replacing tank cushions?

Tank removal disturbs the fuel line and the vacuum line that operates the petcock. Check that both are connected correctly and free from damage or trapping when the tank is refitted. Renewing the rubber supports alone does not verify fuel flow or leak-free hose connections.

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