Will they fit 70 hp merquary boat engine

I am not sure. ( I am not a boat mechanic, I work on motorcycles ) Does it have a carburetor - can you remove the air filter ? If it does have a carburetor and you can remove the air filter, the boots that come with Carb Synchronizer will fit just about any carburetor out there. Hope this helps.

Will this work on my Yamaha banshee

If the inlets are large enough on the carbs—yes. The adapter should work.

are adapters available for smaller throats, ie: 1-3/8" or 36mm?

My measurements are with an engineer's scale. The far left piece is the part you would want to push into the carb throat. It is about 1.28" (33 mm) across in the bore. the tip of the piece is rounded almost 90 degrees (fully rounded over) and has about a 0.15" (3.8 mm) radius of curvature - so to jam it in you would need 37-39mm. You can probably effect a seal because it is pliable rubber and you will be pushing it against the carb throat - the annulus of the unit is still smaller than your 36mm. I like this unit because the UniSyn if screwed down in its adjustment can overly restrict the flow. there is no adjustment on this one, which is nice. I usually leave the trumpets on my car, so they are a bit wider. So a toss-up here. You can probably get it to seal alright if you press it in carefully. Good luck.

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🔧 Sync Up Your Ride with Precision!

DURABLE CONSTRUCTION - Built to last, ensuring reliable performance every time.
USER FRIENDLY DESIGN - Comes with clear instructions for hassle-free setup.
PRECISION PERFORMANCE - Achieve optimal carburetor synchronization effortlessly.
LIGHTWEIGHT PORTABLE - Weighs only 2.1 pounds for easy handling.
UNIVERSAL COMPATIBILITY - Fits a wide range of carburetors for versatile use.

The Universal Pro-Sync Carburetor Synchronizer Tool by EMPI is designed for precision carburetor synchronization, measuring flow rates from 1-30 kg/h. It includes direct mount adapters for easy installation and comes with comprehensive instructions, making it a must-have for any automotive enthusiast looking to enhance their vehicle's performance.

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Manufacturer	Empi
Brand	EMPI
Item Weight	2.1 pounds
Is Discontinued By Manufacturer	No
Manufacturer Part Number	43-5712-B

Universal Pro-Sync Carburetor Synchronizer Tool

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