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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⚡ 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.

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Brand	ALPHA MOTO
Manufacturer	ALPHA MOTO
Country of Origin	USA
Model number	RMI-TO-009
Item Weight	2 kg 100 g
Product Dimensions	30.48 x 22.86 x 10.16 cm; 2.1 kg
Item model number	RMI-TO-009
Item Height	4 Inches
Item Width	9 Inches
Display Size	2 Inches
Are batteries included?	No

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

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