Sierra 18-7746 Carburetor Kit, Replaces 1347-818619R02, for Mercruiser 90-140 HP R2/2GC and R/2GC Carburetors

The Sierra 18-7746 Carburetor Kit is a repair kit for Rochester R2/2GC and R/2GC two-barrel carburetors used on Mercruiser inline four-cylinder engines. It is built to meet or exceed the specifications of the original equipment carburetor components it replaces, giving boat owners a reliable way to rebuild a worn or leaking carburetor rather than replacing the entire unit. The kit covers a wide span of Mercruiser engine applications, from 90 HP 96 cubic inch and 120 HP 153 cubic inch engines through 140 HP 181 cubic inch engines, spanning model years from the late 1960s through the early 1980s depending on the specific engine and carburetor model.

Sierra manufactures this kit to perform in the harsh marine environment, where fuel system components are exposed to ethanol-blended fuels, vibration, and moisture that can degrade gaskets, needles, and seats over time. Rebuilding the carburetor with this kit restores proper fuel metering and idle performance without the cost of a full carburetor replacement. The kit is intended for use on the R2/2GC and R/2GC Rochester carburetor models fitted to the Mercruiser inline four-cylinder engines listed below, and it is backed by Sierra's warranty on marine replacement parts.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7746
• Product Type: Carburetor Repair Kit
• Compatible Carburetor Models: R2/2GC, R/2GC
• Engine Compatibility: 90 HP 96 cid L4 (1970-1972), 120 HP 153 cid L4 (1972-1982), 140 HP 181 cid L4 (1968-1973)
• OEM Cross Reference: 1347-818619R02, 1347-818620R02
• Exterior Finish: Machined
• Unit Count: 1
• Included Components: Carburetor Kit
• Weight: 0.34 pounds

Fitment

• 90 HP, 96 cid L4, 1970-1971, R2/2GC carburetor
• 90 HP, 96 cid L4, 1972, R2/2GC carburetor
• 120 HP, 153 cid L4, 1972-1973, R2/2GC carburetor
• 120 HP, 153 cid L4, 1974-1975, R2/2GC carburetor
• 120 HP, 153 cid L4, 1976-1978, R2/2GC carburetor
• 120 HP, 153 cid L4, 1979-1982, R2/2GC carburetor
• 140 HP, 181 cid L4, 1968-1969, R/2GC carburetor
• 140 HP, 181 cid L4, 1970, R/2GC carburetor
• 140 HP, 181 cid L4, 1970-1973, R/2GC carburetor

Replaces (OEM)

• 1347-818619R02
• 1347-818620R02

Frequently Asked Questions

What engines does the Sierra 18-7746 carburetor kit fit? The Sierra 18-7746 fits Mercruiser inline four-cylinder engines equipped with Rochester R2/2GC or R/2GC carburetors, covering 90 HP 96 cid engines from 1970-1972, 120 HP 153 cid engines from 1972-1982, and 140 HP 181 cid engines from 1968-1973.

Which OEM part numbers does this kit replace? The 18-7746 kit replaces OEM numbers 1347-818619R02 and 1347-818620R02, depending on which R2/2GC or R/2GC carburetor application it is used on.

Does the 18-7746 kit work on both the R2/2GC and R/2GC carburetor models? Yes, this single Sierra kit, part number 18-7746, is listed for both the R2/2GC carburetor used on 90 HP and 120 HP applications and the R/2GC carburetor used on 140 HP applications.

How much does the carburetor kit weigh? The Sierra 18-7746 carburetor kit weighs 0.34 pounds.

Is this a full carburetor or a rebuild kit? The 18-7746 is a carburetor repair kit containing the components needed to rebuild an existing R2/2GC or R/2GC carburetor, not a complete replacement carburetor assembly.

What is included in the Sierra 18-7746 kit? The kit is listed with included carburetor kit components sized for the R2/2GC and R/2GC Rochester two-barrel carburetors used on the covered Mercruiser applications.

Is the Sierra 18-7746 built to OEM standards? Sierra manufactures the 18-7746 kit to meet or exceed the original equipment carburetor components it replaces, for use in the same marine service conditions as the OEM parts.

Will this kit fit a 1975 Mercruiser 120 HP engine? Yes, the 18-7746 covers the 120 HP 153 cid L4 engine for the 1974-1975 model years when equipped with the R2/2GC carburetor.

What finish does the kit have? Components in the Sierra 18-7746 kit have a machined exterior finish.

Does the 18-7746 kit fit a 140 HP engine from 1969? Yes, the 140 HP 181 cid L4 engine for the 1968-1969 model years with the R/2GC carburetor is a listed application for the Sierra 18-7746 kit.