slack

Having some trouble determining my chain tension since I adjusted all my suspension settings last season. I didn't realize they would even have an impact, however, if i measure per the picture, 49/51 mm takes you right into the exhaust pipes. I can measure the true movement of the chain by...

I have over 3 inches of slack when i put the bike on a stand and see how far you can turn the back wheel while in 1st gear and motor off (DUH) before the resistance from the motor can be felt. 3+ inches seems alot to me but may be normal. Curious or is it an issue?