2009 m8 drive cluth spring

Springs

The red spring is a lighter spring than the white. As a reference the white spring will give you an engagement of around 4100 rpm. The red about 3700 rpm. Close rpms as I do not remember for sure. I have used the gold Cat spring that engages even lower at 3500 rpm or there abouts. It seems to be a popular spring with some people and if I remember it is close to the red. I do like the lower engagement. Some people like it because they think it increases ridability and reduces trenching. YMMV. If it were mine I would leave it in and pick up another couple of springs and give them a try. I think the red spring was widely used in the mountain sleds up until 2005. I dont think the spring has as much to do with max engine rpm as the weights.