what are these adapters for? I have a CBR600F4i and would like to sync the idle valves, but I have no clue what these threaded adapters are for.

They are for 4 cycle boat outboard motors that still have carbs.

I just saw the gauge cc motor size (550, 650, 750) after i purchased this item. will this tune a 1985 v65 (1100cc) motor?

The guage don't "know" what it's connected to. It will even work on cars

Will this work on a v-twin motorcycle?

Its a definate maybe. There are more things that I would need to know before anyone can answer that question. Although this might be a little over kill given that you are only going to need 2 of them instead of 4. It's nice to have for if your going to use it on other bikes as well. Generally though if it is a dual carb only one of them is adjustable in which case you can tune by sound. I have seen a few that both are tunable but not extremely often. If you can get me more info on the bike I can give you a more direct answer(year make and model would be very helpful) but in more cases than not yes this will work for you.

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Universal Motorcycle Bike Vacuum Carburetor Synchronizer Synchronize Carb Sync Gauge Cb Kz Gs Xs 550 650 750

Universal Motorcycle Bike Vacuum Carburetor Synchronizer Synchronize Carb Sync Gauge Cb Kz Gs Xs 550 650 750

Product ID: 331343802

Details

Brand
ALPHA MOTO
Item dimensions L x W x H
30.5 x 22.9 x
Manufacturer
ALPHA MOTO
Material
Brass Rubber
UPC
850006231089

🔧chrome-finish steel hardware

⏱️2-inch precision gauges

⚙️built-in damping control

Description

⚡ Sync Like a Pro, Ride Like a Legend

BUILT TO LAST - High-grade chrome-finished steel hardware resists corrosion and guarantees durability under any condition.
PRECISION AT A GLANCE - Factory-calibrated 0-76 cm/hg gauges ensure flawless carburetor synchronization every time.
PRO GRADE CONVENIENCE - Complete kit with multiple hose lengths, extension tubes, and spare O-rings stored in a sleek black mold case.
SMOOTH STABLE READINGS - Innovative built-in damping control eliminates needle bounce for ultra-accurate airflow measurement.
UNIVERSAL FIT ULTIMATE FLEXIBILITY - Includes 5mm & 6mm adapters to fit all major bike brands plus marine applications—sync any ride with confidence.

The ALPHA MOTO Universal Motorcycle Carburetor Synchronizer features factory-calibrated 2-inch gauges with 0-76 cm/hg readings, built-in damping control for stable needle movement, and durable chrome-finished steel hardware. Designed for universal compatibility with 5mm and 6mm adapters, this precision tool kit offers professional-grade accuracy and longevity, packaged in a convenient storage case for seamless carb sync on all major motorcycle and marine engines.

Specifications

ASIN	B004MSE9JO
Brand Name	ALPHA MOTO
Customer Reviews	4.6 4.6 out of 5 stars (421)
Item Dimensions	30.5 x 22.9 x 10.2 Centimeters
Manufacturer	ALPHA MOTO
Material Type	Brass Rubber
Model Number	RMI-TO-009
Part Number	RMI-TO-009
UPC	850006231089

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