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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Empi Universal Pro-Sync Carburetor Synchronizer Tool

Product ID: 48438974

Details

Brand
EMPI
Manufacturer
Empi
Product Dimensions
2.75"D x x
UPC
683194681844

🔧Direct mount adapters included

⏱️Quick, precise carburetor sync

⚖️Measures 1-30 kg/h pressure range

625 zł

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Description

⚙️ Sync Like a Pro, Drive Like a Legend

LIGHTWEIGHT PORTABLE - At just 2.1 pounds, take professional-grade tuning wherever your ride takes you.
EFFORTLESS INSTALLATION - Includes step-by-step instructions and replaces older syncro models for seamless upgrade.
UNIVERSAL COMPATIBILITY - Comes with direct mount adapters for VW Bug, Baja, Sand Rail, and more—sync any carb with ease.
TRUSTED BRAND RELIABILITY - Empi’s proven quality ensures durable performance for all your carburetor synchronization needs.
PRECISION PRESSURE MEASUREMENT - Accurately gauges carburetor vacuum from 1 to 30 kg/h for flawless engine tuning.

The Empi Universal Pro-Sync Carburetor Synchronizer Tool is a precision instrument designed to measure carburetor vacuum pressure between 1 and 30 kg/h. It includes direct mount adapters compatible with popular VW and off-road vehicles, replacing older syncro models for easy installation. Lightweight and reliable, this tool empowers enthusiasts and professionals to achieve perfect engine tuning with confidence.

Specifications

ASIN	B073RPTLZM
Best Sellers Rank	#747,423 in Automotive ( See Top 100 in Automotive ) #4,276 in Powersports Carburetors
Brand Name	EMPI
Customer Reviews	4.6 4.6 out of 5 stars (78)
Item Dimensions D x W x H	2.75"D x 2.23"W x 4.75"H
Item Weight	2.1 pounds
Manufacturer	Empi
Manufacturer Part Number	43-5712-B
UPC	683194681844

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TrustScore 4.5 | 7,300+ reviews

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625 zł

Duties & taxes included

In stock

Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Poland.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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