as some of you may recall, i'm stuffing a 999 sourced motor and swingarm into my monster s4 frame this winter. i've got the frame dropped on the motor and have made some observations i figured were worth sharing. first, here's the specimen:
1 - motor mounts are just fine. mounting bolts are same width, frame location is identical as expected and cases are same width as well.
2 - there's no way the 999's airbox is fitting. the bar that runs from the lower left frame rail to the lower right frame rail right behind the steering head conflicts. i'm debating either making a new airbox to suit the dimmensions or cutting the bar and welding in an "x" bar that would offer a bit more clearance for the airbox lid. in either case... i'm going to try to make a CF box since it's such a visible item on a naked bike.
3 - with the 999's swingarm, the mounting orientation for the tie rod and shock are about 25mm's over to the LEFT compared to the monster's so they don't jive with the stock rocker-mount location. i pinged alex ortner to bounce the idea of making a custom rocker to accomodate but with his advice, i came to the conclusion that modifying the frame to move the rocker mount point makes more sense and will cost much less (next to nothing).
4 - thankfully, i recieved the longer 999 suspension tie rod for the rear because the stock monster one doesn't seem to be quite long enough. but i'll know for sure when the bike's together and the rear suspension's under a load. i've still got the s4's stock unit as well as the unit off a 998 which is the shortest just in case.
5 - radiator mounts are almost in perfect position. the tabs on the radiator will have to be bent outward SLIGHTLY to be able to use the stock s4 mounting on the frame.
6 - fuel tank mount has to be jacked up about 1/2" for the tank to clear the vertical cylinder. thankfully i hadn't sold my tank yet so i could check this clearance. hopefully, the CF tank will be either identical or will offer a bit more room. will see if/when DNA finally delivers one!
7 - haven't quite decided yet where to put the battery and regulator. i may source a teenie battery to hide under the tank and the regulator may go under the tail as before but there's going to be some other (secret sneaky) stuff conflicting under there
8 - oh yeah... very SLIGHT conflict on the "X-bar" that goes across the frame by the throttle bodies with the fast-idle cam on the 999 assembly. not sure if i'm going to rework the cam or cut a small section out of the bar. will likely rework the bar.
9 - last really important thing is that the frame will have to have a brace added to help support the load of the swingarm at the pivot since the 999 motor's got less meat/support back there.
i'll post more as things develop!