These are the parts that you have removed; the retaining bolt, setting plate, decomp rod, and spring:
Remove the spring from the rod, noting how it "hooks" over the end of the rod. Look at the end of the decomp "nub". You can see that it is sort of "V" shaped, and you need to remove all of the backside of the nub, saving the first .080" of lobe. Make sure you note the orientation of the nub, in relation to the roller, so that you grind off the correct side of the nub (the BACK, not the front). This is where the sharpie and observing the wear marks on the nub, come in handy:
This is where a caliper or micrometer comes in handy. I happen to reload ammunition, so I had one handy. If you don't have one, this mod is at your own risk, but I can tell you how to figure it pretty close; look at the top of the nub... you can see the worn contact area of the nub, where the roller contacted the nub. You want to remove the back half plus a bit, of where that contact wear is, and make it flat to where the nub's lobe stops. I measured and made a mark where I wanted to grind:
Clamped a Dremel with a 1/2" sanding drum in the vice, and carefully ground the spot away:
The area from where the nub's lobe starts, to where you ground off, should be about .080". Everything behind that, grind down to the point where the lobe's finished radius stops:
After getting the desired .080" of nub lobe, I took a piece of 1200 grit wet/dry sand paper and knocked off any burrs or sharp edges. This is what the end of the rod looked like after grinding:
Clean off all residual metal shavings off of the rod, and lightly lube. Position the spring back onto the rod as shown, with the hook over the weight arm:
Turn over the motor until the camshaft's decomp slot is on the top:
Push in the decomp rod and spring into the channel in the cam, making sure the spring is wound under (clockwise), and rests on the cam's cutout area, on the backside of the camshaft:
Then, rotate the motor carefully, so that the cam rotates 180 degrees, by the kick starter, holding the decomp rod in with a finger, so that the retaining bolt hole is at the top.
Then, slide the setting plate onto the bolt with the indexing spike towards the cam, and after putting a dab of loctite on the threads, install the bolt into the cam, making sure the setting plate's spike enters the alignment hole in the cam. Torque the retaining bolt to proper specs (I don't have the inch pound figure, I'm sorry...I did it be feel):
Put the valve cover back on, making sure to align the plug channel seal, and attach the breather tube, and properly torque the cover bolts, and install the plug wire. Replace the fuel tank and seat. Start it up easily, and smile.
After this mod, my bike starts MUCH easier. Hot or Cold, it fires as easy as my old 450 did. Surprisingly, kicking (perceived compression) is no more difficult than it was before the modification. I think the slight decrease in decomp duration simply made the firing cycle stronger at startup RPM, making it start 500% easier. My '08 starting blues are OVER! We all owe it to Ron Hamp (RHC) for making this mod known to us. He spends his time making our bikes faster and more enjoyable, and not very often you get that for free. Thanks Ron! :ride: