Ground my 415 ramps

[ReTodd]

Wondering who has tried grinding their ramps. I have two sets of 415 ramps and after reading and thinking about it I decided to grind a set. Ground down the start of the ramp so it has a lower engagement and then ground into the middle of the ramps a bit to steepen up the top end (so I don't have to clicker up). They look really good and I am excited to get it out and try it. I've got BJ's secondary kit from a few years ago and the back shift on my sled is really great.

The primary though always seemed to be either to "revy" on the low end (riding around the meadows at 6500+ rpm) or too low on the top end. If you adjust for the low end by adding heavier weights you would lose your top rpms. So then you clicker up to 5 or 6 and again, your low end suffered. Tried lots of different springs and weights but I think a large part of it is in the curve of the ramp. Hopefully have her out Sunday for a little test ride on the road and will see how she feels. Probably have to make some changes in weights/springs to get her right but I'll bet she's gonna have a better all around range.

Anyone else try this?

Rt

 

[09 Blue Ski-Doo]

Equal!

Make sure your machining process was very! accurate, if your ramps pull at an en-equal angle you will get engagement vibration that will very quickly tear the heck out of everything!!!

 

[ReTodd]

Make sure your machining process was very! accurate, if your ramps pull at an en-equal angle you will get engagement vibration that will very quickly tear the heck out of everything!!!

Thanks for the heads up. the ramps were all blocked together and finished off with a dremel for a very smooth finish. When you did yours, how much did you take off?

Rt

 

[Teth-Air]

Wondering who has tried grinding their ramps. I have two sets of 415 ramps and after reading and thinking about it I decided to grind a set. Ground down the start of the ramp so it has a lower engagement and then ground into the middle of the ramps a bit to steepen up the top end (so I don't have to clicker up). They look really good and I am excited to get it out and try it. I've got BJ's secondary kit from a few years ago and the back shift on my sled is really great.

The primary though always seemed to be either to "revy" on the low end (riding around the meadows at 6500+ rpm) or too low on the top end. If you adjust for the low end by adding heavier weights you would lose your top rpms. So then you clicker up to 5 or 6 and again, your low end suffered. Tried lots of different springs and weights but I think a large part of it is in the curve of the ramp. Hopefully have her out Sunday for a little test ride on the road and will see how she feels. Probably have to make some changes in weights/springs to get her right but I'll bet she's gonna have a better all around range.

Anyone else try this?

Rt

No, have not ground ramps but use the 414 ramps, which are higher at the start. This helps shift up at lower speeds. This has made it possible to click up for higher rpms without making it too revy at the bottom. You sound like your going the wrong way by grinding the bottom down. I would like a still taller ramp at the bottom or steeper at the top as it is a 50% improvement.