700 VS 800

"Dear Ralph" January 18, 2005 0
Dear Ralph: I own a Polaris XC 700 SP with VES. I’ve read with great interest some of the changes and issues the 800s...

Dear Ralph:
I own a Polaris XC 700 SP with VES. I’ve read with great interest some of the changes and issues the 800s have been dealing with, specifically with the power valves, but it seems as if the 700s are not mentioned in the same page as the 800s. Is this due to the popularity of the 800s, or is there something about the 700s that make it immune to the issues of the 800s?
Tim Pierce

Most of the power valve durability issues were on 800s; here’s why. Excessive heat is the enemy of the valve itself. Most power valve reliability issues were found on 800s that experienced “marginal cooling”. The 800 is generating more power to begin with, but there is a significant difference in the cylinders themselves between the 700s and 800s. On the 700 cylinders you will find additional coolant passages on the exhaust side that are NOT on the 800s (larger piston uses more real estate). This allows the power valves on the 700s to operate cooler, due to the additional heat removal afforded by the extra cooling capacity.

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