Questions on 2007 m8

I bought an all stock 2007 m8 153 last year. Sled is in good condition and ran really good 3500ish miles on it. No issues there. Biggest issue I found was with the stock Challenger track. Track is completely done. I got a 2.6 Powerclaw to run on it so that should be handled. I bought an SLP full pipe kit for it also. Took a look at the cylinders and the pistons while I had the Y-pipe off. They look great. I pulled the cover off of the primary and the rollers spin but seem to be a little loose. The inner and outer bushings on the sheave and the outer cover have a fair amount of play in them also. Fluid was changed last year in the diamond drive and still looks good.

Questions

1. It has Cutler adjustable weights in it Yellow/white primary spring and orange secondary. My plan was to add a little weight to the primary and see how it does cause I was really happy with the way the clutching felt last year. Anybody see any issues with that?

2. Is it worth maintaining the primary clutch? It looks good but do these clutches have issues coming apart also. I just don't want to put well over $100 into a clutch that might be on it's last leg.

3. Any other items that should be inspected while I am tearing into this thing?

sledhead685 said:

With the SLP kit you want to add/subtract clutch weight to get peak RPM of 8100, that's where peak power is with that pipe (stock is 7800 I believe). I have the same setup as you actually, 2.6 PC with SLP kit and cutler weights. I can't remember where my weights are at, but I probably ride at a different elevation as you anyway. As far as clutch wear, I was also in that situation last year. It was feeling a bit sloppy so I decided to get a new one (wasn't much more money that a rebuild). That really helped with RPM fade and shifting. I also went with a speedwerx 120/310 primary spring and a glide washer on each side, pretty happy with this setup. On the secondary I replaced spring and rollers. While I had the clutches off I replaced the motor mounts and that little snubber bumper between the motor and the diamond drive. Then put a lot of effort into aligning and cleaning the clutches, seems to have really paid off. Pulls a lot harder and longer now, and belt is holding up great. All cheap and easy stuff that really pays off.

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Thanks for the advice.

So what spring were you running in the secondary? I am planning on replacing the primary spring but the secondary spring and rollers were just replaced so I am thinking about getting a new primary spring and adding a little weight and seeing how she runs.

That is a good heads up on the motor mounts. Keeping everything straight and true is really important for the clutches to work properly.

I do ride at around 10k feet a lot so i get that your clutching might be different than mine.

Thanks for checking on that weight for me. I do have the 57/63 gearing which for now I think I'll leave alone. It looks like that spring is fairly close to the speedwerx spring but probably a little lower engagement and more pressure compressed so probably a good idea with the extra power from the pipe.

Thanks again for the info and knowledge. Having bought my first two cats last year it's kind of a learning curve.


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That's an awesome chart. I imagine that using the spacers in there most likely brings the starting rate up a little unless they figure that into the installed height of their spring.


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