I installed reverse & electric start on our (my son's) 2001 SXR-700 and it wasn't too bad. I found a kit from BOP I believe. It's a good opportunity to take the chaincase apart and check everything out.
You'll need,
- Chaincase cover, gears, chain, shaft, shift fork, reverse drive gear shaft retainer bolts
- Shifter & Linkage (bolts on) & bolts (3)
- Beeper if interested
- Template for cutting out dash/shroud opening for shifter lever
For all the parts kit used you are probably looking at $3-400. I found new kits listed but crazy prices and not available for some I checked. The kit I bought had all the main parts (greasy & a few bolts missing) and the reverse shift mechanism was all set up so it was plug & play. I cut the shift lever opening in the dash using a template from the instructions I found on line. Search for the instructions they are good and will get you all the way through it. Oh, I did not get a beeper, but found one on ebay and added that to the existing harness connection, works great.
We tried it out a couple weeks ago (in some snow that came & went) and it worked great. No more broken back pulling it all the way off the trailer. Electric start was a great add on too.