Primary spring/weights?

[e46m3]

I was looking at my primary spring while I had the clutch off. The spring coating has come off and the spring is rusting. I was wondering if there is a better spring you guys recommend or if I should just replace the stock black/green spring. Also, the book says the 900 is suppose to take 10-74's around home (about 600 ft). Should I just stick with the book?

Jesse

 

[e46m3]

Sorry, its an 05 900 RMK 159"x2". That might help.

 

[guidoxpress]

I was looking at my primary spring while I had the clutch off. The spring coating has come off and the spring is rusting. I was wondering if there is a better spring you guys recommend or if I should just replace the stock black/green spring. Also, the book says the 900 is suppose to take 10-74's around home (about 600 ft). Should I just stick with the book?

Jesse

if you have stock pipe and flash, thats the best clutching for the altitude your at.

black/green
10-74

but if you have your stock secondary helix, you need to consider changing that with something more effective...lots of info on this here.

 

[MNtravis]

Educate me on weights...

My 2005 Fusion 900 has the blue spring with a white stripe and 11-76 weights. I am running an SLP head, pipes and muffler. The computer was re-mapped by the dealership for this set up. The guy I bought the sled from put the above weights in, said it was an improvement in his opinion. The manual shows 10-74 weights as stock, I assume that the 74 part is the grams the weight weighs?? What is the 10 part, or in my case the 11 part? I know it engages about 400 rpm earlier than it would stock. What do you guys think?