Radiator Thermosat

[2stroke]

I have as 2006 Gasgas EC 300 and recently put on a Trail Tech Striker with speed and water temp capabilities. What I found was that my bike would never get above 150 degrees while riding. I even tried to get it hot by slowly going around in first gear. Even stopped and idling or revving the engine it barely got to 170 before I gave up. I am considering putting in an inline thermostat in the right radiator line. I saw a 2011 with one installed, and was wondering if this was ever a stock option, or what the best aftermarket option is. I am thinking 165 or 170 should be the minimum temp the engine should be at.