That sounds like a big hassle... your pictures look good though, nice work... but I took the easy road and paid the $189 for the clutch cover for the 2007 quad... no mods required!
The kickstarter is a problem, but I found one for a 2005 WR450 on ebay at a reasonable price. At least now I don't have to worry about the kick shaft breaking as easily as the 2003 ones can!
Like you said time will tell if it helps any but it sure can't hurt... Yamaha would not have made the effort to do the oil nozzle if there were not some benefit to be had.
I would have updated to a new case but after factoring in a messy divorce plus alimony and child support it was simply too expensive, (she did let me go ride all weekend in Tennessee so I can't bitch).
Really wasn't that big of a deal, worst part was that my friend lives a hour and a half from me so I had to make two trips there to pick up and drop off the case, but I have a company car with free gas so just a bit of time really, and we get to hang out and have a couple beers while I'm there. Plus I like to tinker and do this sorta thing so I just figure its cheaper than therapy.
I put 100 really tough miles on it this weekend at the Lorreta Lynn trail ride and the bike ran great, I think the oil pump makes the motor a litte quieter, maybe just in my head but never the less I feel better knowing the oil pump is upgraded and the nozzle is spraying the wristpin down with oil as I abuse the crap out of it!
Besides the oil nozzle this was my first ride on the FMF
Q4 slip on. I was very impressed as it really did help with low end pull, the bike had a flat spot in the power right off bottom with the stock unit and GYTR
insert, nothing unrideable but just didn't pull like a 450 should.
Next mod?? Maybe some guts seat foam as the stock foam sucks.. And I need a new set of tires as mine look like they have been in a meat grinder and I ripped off a bunch of front side knobs this weekend.