I've looked all over the forum already, although I am new to it and may have looked poorly, but I have yet to find a good discussion on getting a 600/1000RR subframe onto a VTR. I want an undertail exhaust (and a SSSA sometime) but I don't want to try and squeeze a pipe in under the stock tail. CBR's come with all those issues worked out already, so maybe that's the answer. Plus, squids wreck a lot of 600's so the parts are out there for the taking.

As far as I can tell, the biggest problem would be having brackets fab'ed up to mount the tail section on. The VTR has a lot of room b/w the two frame/subframe mounting points, whereas it is a lot closer on the RR's.

Anyways, anybody ever tried doing this mod before???

 

I tried this and you can get it to work. There are some limiting factors in doing this. I will list out what works and what doesn't

Works:
The cool thing about this subframe is that it bolts together. The top mounting points are about 5MM off from lining up. You simply unbolt the brackets that connect the front portion of the subframe and you can then spread it to mount it up. You will need to make some sort of bracket to mount up the lower point, but I was able to do this with 1/8 aluminum plate.

Doesn't Work:
This list is slightly longer. When you spread the subframe, the tail section doesnt quite fit. The about you are off when you attempt to mount everything back up does shrink as you move back, it is still off enough that you would have to expand some of the mounting holes on some of the brackets.

Seat mounting is another issue. The 600RR seats do not mount up cleanly and I think that the 1000RR seats might be a better option. I have since moved in a different direction with my project so I never got to the 1000RR seat. From what I experienced, the 600RR seat is too short, it can be either front or rear depending on your mounting points. The front doesn't fit clean against the Superhawk tank, and even if you were to trim the front tips, you would have about an 1.5 inch gap between the back of the seat and the stock plastic. So you would be stuck having to either fabricate a new seat pan, extend the stock plastic or find some other means at a filler.

I currently am working on getting a race 1000RR tail to fit with a modified RC51 subframe. Things are moving along ok... not to speedy as I dont have much time to work on it. By using a race tail that is intended for use with seat foam, you have the extra plastic already molded on. I don't have pictures of that portion of the project with me, but I have added in pictures of a 600RR tail section as well as my first attempt which was an RC51 tail section. I will take some pictures tonight of the 1000RR tail section I am using and you can get a better idea of where I am going with it.

Hope this helps!

 

Do you think it's possible to get the top mounting points cut off and welded back on with a little extension side-to-side? That would solve the issue of splay.

As for the issue of seat fit: Would it be possible, in your opinion, to locate the seat as far back as it will go and then have a little sheet metal fabricated to fill the gap at the front? It could be a little sloped wedge, painted black or whatever, and it could just sort of be spot-welded onto the tank. When the seat was on it would just look like the tank fit properly.

Of course, all this is pure speculation as I have never seen the project in question performed. I would really like to get this to work sometime as I would like a SSSA and the undertail exhaust of the CBR would be a great compliment, what with being able to see the swingarm and everything...

I'd have to mod the exhaust for the VFR SA anyways, might as well go all the way.

 

The biggest issue is that the new subframes are cast aluminum and probably are not that easy to weld. The amount of deflection is not that major and you could work around it. I no longer have the 600RR parts as it was clear I wasn't going to go that route and didn't want to have non-sellable parts hanging around. IMO, you could use any subframe for an undertail exhaust, it is more so how you want the plastic to look. Granted the RRs are built with that in mind with all of the mounting points, you would then be locked into those said mounting points. If you went with something other than a RR subframe, like say one from a RC51, you could do welding etc to it to get the mount points to the frame and the exhaust as needed.

 

Seaton...

Love the way you integrated the RC51 tail section. Any pics without the plastics? I have a good idea what you did to mount the subframe (looks like a machined plate/bracket). The seat looks to fit nice and snug as well.

Any other issues bolting it up?

J.

 

Here is a pic of the new 1000RR tail that I have for my bike. As you can see it is supposed to take just a foam pad for a seat... not the best for comfort factor. I plan on cutting out the portion where the stock RC51 seat would mount and by having the seat area full enclosed, I would not have to fabricate anything. You could follow the same logic using a 1000R subframe, but I chose to use the RC51 subframe for ease of welding and mounting options for electrical and the underseat radiator that will be going in.

J - you can see the plate that I used to mount the subframe to the Superhawk frame. It is nothing pretty when you don't have the tail section on, so I plan on using aluminum tubing to bring the mounting points in line with the stock points on the superhawk. Let me know if you would like any closeups of the bracket.