Hours of Operation: Tuesday – Friday, 9:00 a.m. – 5:00 p.m. | Saturday, 9:00 a.m. – 12:00 p.m. | Closed Sunday & Monday

Call Us in Flat Rock, Illinois,
at (618) 584-3567
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Cuyuna & 2si Engine Parts Catalog

Included in this electronic catalog is a partial listing of faster moving Cuyuna and 2si engine parts. We have many additional parts, both new and used, that were not included. If you do not find the part you need pictured in our catalog, please call or e-mail us. It is quite likely that we will have the part in stock.

In October 2014, ZDE, LLC purchased the AMW- CUYUNA Engine Company. The newly formed company, CUYUNA Engine, LLC will provide spare parts for CUYUNA and 2si engines in the field, as well as develop other new and innovative products. ZDE, LLC currently maintains the largest inventory of CUYUNA spare parts in the world.

Although we supply the finest parts available, from quality manufacturers, none of our parts were designed nor intended for use in Ultralight or Experimental Aircraft applications.


Gaskets used in Cuyuna 215, 230, 430, UL II 02, and 2si 460 series engines.

Some gaskets are also used in the 2si 460 & 690 liquid cooled engines, as well.


Gaskets and O rings

Gaskets and o-rings used on liquid cooled Cuyuna 430 and 2si 460 and 690 engines.

Bearings and Seals Used in Engines

Bearings and seals used in all Cuyuna & 2si engines.

Typical Hardware Items

Typical hardware items found on all Cuyuna & 2si engines.

Parts of  Fan Pully Halves

Upper and lower fan pulley halves, fan shaft, spacer, tensioning shims, fan belt, and late model recoil cup. Used on all air cooled Cuyuna & 2si engines.

Power Take off Engine parts

Standard fan pulls in air and pushes it towards PTO end of engine. Reverse fan pulls air in from PTO side of engine and exhausts out fan cover.

Standard Head and Flow Through Head in an Engine

Upper cylinder head is the standard head. The lower cylinder head is used on later model 430 and all UL II 02 engines on one cylinder only. The "flo-thru" head is placed on the cylinder receiving the cool air first. On a standard engine, the flo-thru head would be located on the cylinder nearest the fan.

Pistons and Rings

We stock pistons for the Cuyuna 340, 430, UL II 02, 215, 230, 460, & 690 engines. We also have sleeves for UL II 02, late model 215, 230, 460, and 690 engines. All pistons are offered in .5mm oversizes. Piston and rings may be available for some earlier Cuyuna engine models not listed above, by special order.

Ignition Components

Ignition components common to most Cuyuna & 2si air cooled engines. Small black coil pictured with no ignition wires is used on point ignition engines. Tan colored coil is used on early CDI ignition engines with Nippon Denso ignitions. Black coil with wires is late model CDI supplied by Kokosan.

Pictured are Ignition and Charge Components

Pictured are ignition and charge components for the 690L-70 engine. Ignition module in lower RH corner is for the 460F-35 engine.

Exhaust System Rubber Isolators and Springs

Various exhaust system springs, exhaust system rubber isolators, new and old style, and standard B8ES spark plug used in virtually all Cuyuna & 2si engines.

Recoil Parts

Early style recoil parts. Identifiable by the black plastic recoil pulley. Later recoils used steel pulleys. Engines built since mid-eighties use white plastic recoil pulleys.

Current Style Recoil Assy

Current style recoil assy. Starter motor used on most electric start engines, and starter ring gear.

Water Pump, Water Pump Belt and Cylinder

Water pump, water pump belt, and cylinder head used on all 2si liquid cooled engines.

32mm Mikuni Carburetor

32mm Mikuni carburetor used on most Cuyuna engines. 2si engines used 32mm & 36mm Bing carburetors. These engines can be retrofitted to accept the superior Mikuni carburetors. Also pictured are standard jet packages and the lever choke kit.

Typical Air Filters

Typical air filters used. Foam style used on all air cooled engines. Paper type used on liquid cooled engines.

Carburetor boots available for 28mm, 32mm, and 36mm carburetors.

Mikuni Fuel, Throttle Splitter and Original Cuyuna Service Manual

Mikuni fuel pumps used on single, twin, and triple cylinder engines.

Throttle splitter for dual carburetor installations.

Original Cuyuna Service manual and Parts manual for the 215, 430, and UL II 02 engines. The only viable service manual for the 2si engines. Also parts manual for the 2si liquid cooled engines. All contained on CD.

Cuyuna Special Tools

Cuyuna special tools.

Flywheel puller for all Cuyuna and most 2si engines.

Piston pin puller -all engines.

2si Cog Belt Reduction Drive Parts

2si cog belt reduction drive parts.

We also have upper shaft and bearings, not pictured.

New and used complete units are sometimes available.

Nova/2si Gearbox Parts

We carry Nova/2si gearbox parts, such as bearings, seals, rubber isolator bushings, rubber vent valve, drive hubs, and hardware items.

Complete gearboxes are available, generally used, in ratios of 2.48, 2.04,2.65, and 3.04 to one.

The pictured parts are representative of our inventory, but do not show all of the parts we stock.

Please call if you do not see the part you need.

We depend upon purchases of new "old stock" and salvaged used engines for out-of-production older parts. If you have good used or new "old stock" Cuyuna or 2si parts or engines, please provide us a list of items and we will make an offer to purchase.