POLARIS 78676 Crankcase Engine Crank Motor

( Manufacturer Part Number: 78676 ), ( Part Type: Engine Crank Motor Case )

Review POLARIS Crankcase Engine Crank Cases Motor fits INDY 400 500 1985–1986

Polaris Indy 400/500 Crankcase Engine Crank Motor (Model Years: 1985-1986)

The Polaris Indy 400 and 500 all-terrain vehicles (ATVs) were renowned for their power and agility during the mid-1980s. These models, produced between 1985 and 1986, were an essential part of Polaris's legacy in the ATV market, and their crank motors were instrumental in delivering the desired performance. This detailed product description focuses on the Polaris Indy 400/500 crankcase engine crank motor for model years 1985 and 1986.

The crank motor is a vital component of the engine system. It converts linear motion of reciprocating pistons into rotating motion needed to produce power for the drive wheels. Compared to other components, the crank motor is relatively simple, but its performance is crucial for impressive ATV performance.

Polaris designed the Indy 400/500 crankcase engine crank motor with durability and reliability in mind. It boasts a robust cast iron construction, which effectively shrinks the weight while increasing the strength and rigidity of the engine, leading to improved overall performance and longevity.

When it comes to engine dimensions, the crank motor for the 1985-1986 Polaris Indy 400/500 models has a stroke length of 2.36 inches (59.93 mm) and a bore size of 2.99 inches (75.93 mm). These measurements contribute to a displacement volume of approximately 354 cubic centimeters (21.44 cubic inches).

Polaris engineers paid close attention to the crankshaft design, utilizing a forged steel material for superior loading capacity and unparalleled resistance to stress and fatigue. The crankshaft is also entrenched in seven main bearings, which includes three crankshaft bearings and four counterweight bearings. These bearings ensure a smooth operating environment, minimizing friction for increased engine efficiency and life span.

A crank motor pulley mounted on the crankshaft drives the Polaris Indy 400/500's chain driven secondary transmission, ultimately engaging the final drive system and propelling the machine forward. The pulley itself features a tooth width of about 1.5 inches (38.10 mm), as well as an overall width of approximately 6 inches (152.40 mm), providing an ample contact area for the drive chain, which enhances the overall drivetrain performance.

Lastly, the crank motor is backed by the expertise and trustworthiness of Polaris, a leading manufacturer of powersports vehicles. The company has a longstanding commitment to delivering top-quality products, ensuring that the Indy 400/500 crankmotor (sic) performs optimally and maintains peak condition with regular maintenance.

Replacing this crank motor involves removing the engine and, subsequently, the transmission in its entirety. While the installment process can be complex, the detailed instructions and OEM parts availability ensure that the replacement process can be accomplished confidently and efficiently.

In summary, the Polaris Indy 400/500 crankcase engine crank motor, manufactured for model years 1985 and 1986, is a robust and high-performing part engineered for reliable operation and uncompromising off-road experiences. Its class-leading features, impressive dimensions, and engineered-for-durability design make it an essential component for any dedicated Polaris Indy 400/500 enthusiast or collector.

Pros and Cons of Buying a Polaris Indy 400/500 Crankcase Engine (1985-1986) for a Snowmobile

The Polaris Indy 400 and 500 snowmobiles were popular models manufactured between 1985 and 1986. These snowmobiles were equipped with crankcase engines. In the market for purchasing a used Polaris Indy 400 or 500 crankcase engine? Here's a list of pros and cons to help make an informed decision.

1. Dependability: Polaris has built a reputation for manufacturing durable and reliable snowmobiles. The Indy 400/500 crankcase engines are known for their longevity.

2. Cost-Effective: Used engines in good condition may be available at a lower price point compared to new or rebuilt engines. This could be an attractive option for those on a tight budget.

3. Availability of Spare Parts: Since the Polaris Indy 400/500 were long-produced models, finding replacement parts would not be a significant challenge.

4. Repairability: The crankcase engine design offers easier access to internal parts for repair work.

5. Throttle Response: The crankcase engines are renowned for their crisp throttle response, which could lead to better performance on the snow.

1. age and wear: Older engines may have encountered wear and tear, leading to repair needs. A thorough inspection and assessment of the engine's condition would be necessary before making a decision.

2. Mechanical Complexity: Crankcase engines involve more moving parts and can be more complex for DIY repair work compared to newer engine designs. Professional assistance might be required.

3. Potential for Damage: The engine's location in the sled, exposed to snow, cold weather, and other elements, may increase its chances of sustaining damage.

4. Emissions: Older engines may not adhere to current emission standards, which could impact their legal use in certain areas.

5. Fuel Efficiency: Older engines may have lower fuel efficiency compared to newer engine designs. This would translate into increased fuel costs over time.

1. If affordability, spare parts availability, and performance are your concerns, this engine may well be your best option.

2. If you're looking for a new, fuel-efficient, or emission-compliant engine, a newer engine design may be worth considering.

3. Always remember to assess the engine's condition before making a purchase.

Thoroughly research, inspect, and assess the condition of a used Polaris Indy 400/500 crankcase engine (1985-1986) before making a purchase, or consult with a professional mechanic for advice based on your specific goals and needs.

Details:

Up for sale is a crankcase assembly in good working condition. This item is from a very clean and well maintained 1986 Polaris Indy no cracks, repairs, journals are smooth. We ran and tested this unit found it to be in very good running condition with 3835 miles on the odometer at tear-down.

part #: 78676 prices

• $39.95-$63.57

specifications enginesnowmobile:

• for models: 400, 500, Indy
• for makes: Polaris
• for years: 1985-1986
• mpn: 78676
• part type: Engine Crank Motor Case

Payments enginesnowmobile:

• PayPal

Offer enginesnowmobile:

• best offer: false
• : true
• Started: October 24, 2017, 5:23 pm
• quantity: 1
• Sold: 0
• min. bid: $79.99
• bids: 0

General enginesnowmobile:

• in stock: Yes
• motors > partsaccessories > snowmobile partsaccessories > snowmobile engines components
• condition: Used

Returns enginesnowmobile:

• type: Money back or exchange buyers choice
• policy: returns accepted
• time: 14 Days
• paid by: Buyer

Seller enginesnowmobile:

• city: Elgin, Illinois
• zipcode: 60123

Ratings:

1. Shipped fast, priced right. Thank you. 10-21-17
2. Great packaging, fast shipping. works as stated 10-16-17
3. Great communication. A pleasure to do business with. 10-19-17
4. A-1 item, Fast shipping, Quality, As described, Thanks 10-14-17
5. A 10-09-17

Shipping enginesnowmobile:

• handling: 1 days
• cost: $0.0
• type: Flat

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