Metallic Blue secondary spring is heavier than the secondary spring in our DBW660Y Grizzly kit. It can be used as an accessory to aid the 660/700 Grizzly 4X4 atv’s in serious mud applications with 28″ and larger Agressive Mud Specific tires. For trail riding and tires smaller,or less agressive ,the plain w/pink stripe spring in our DBW660Y kit is better and more appropriate. Also the stock spring on the 700 Grizzly’s would be better unless using these specific tires. For GRIZZLY ATV applications this spring is only for the big agressive mud competition tires.
This spring is also appropriate to help with bottom end and mid range response on 660 RHINO applications using heavier stock size, or 26-27 inch tires. Helps slow the initial upshift of the belt,and get rpm quicker on initial take off. Also helps with power loss from Sand applications.