Ok so I want to modify my (unrestricted) R65GS and I could use some help/info, here goes
First of all: I ride onroad mainly and especially inner-city-guerilla, please read all before answering because camshaft, gearbox and final drive mods will each have an effect on the others.
Easy parts exchange between restricted and unrestricted seen here:
http://westerbaen.tweakdsl.nl/R65GS/specs.html -exhaust, I ram a 38mm hole-saw in the exhaust, hoping to take out the last inner bit and leaving the outside looking original (hole-saw fit perfectly between inner and outer tube). (first I ordered some different sizes mainjets offcourse, which is hard to find out which partnumbers they have so if anyone needs partnumbers from 130-170...) This last bit of absorption pipe is ~20cm long and after disconnecting inner and outer at the end I found out that at the other side it is still connected inside as well...anyone has a picture of an opened up original exhaust end-pipe?. Problem is that the exhaust is way to quiet when driving ~110km/h on a bycicle filled dyke, they can only hear you 15mtrs away so had a few near-hits... So by just removing half or the complete last inner pipe I hope to give it just a bit more noise, rest of the pipe is reflection so not much gain in power anticipated.
-header pipes, I'm contemplating a dubbel crossover system, so one in front of the engine and the collector at the back of the engine, I'm under the impression that the one in front is for high revvs/street use and the one in the back for lower revvs/nduro/offroad. Something like this
http://www.staintune.com.au/exhausts/bmw/images/BMW%20R45%20R65%20R65LS%20Single%20Crossover.jpg There is a double also
http://www.staintune.com.au/exhausts/bmw/images/BMW%20R65%20R65LS%20Double%20Crossover.jpg But then you have to have 2 low end pipes also
-final drive, I'm thinking of using one from a restricted R65GS (3,44 9/31 versus 3,36 11/37) so the bike has a little less top speed but gets there much quicker, but the normal 1st gear will become very short and the 5th also, so maybe only combined with a longer 5th to have some higher top/cruising speed.
-gearbox, with or without this other final drive I think a shorter 1st gear will be nonsense on a street bike, but a longer 5th will improve always?
-camshaft, having found 7 different camshafts but apparently in 2 categorie's, probably because lift-hight. There are for instance 2 different 308 cams, one for R45, R65 and restricted 65's and one for 800cc's and up. And I've read some good reports about this mountain/enduro 296 cam, which is not a BMW original only aftermarket from 2 or 3 producers, but...will it fit my R65GS and not smash the valves against the piston? Or should I keep my 308...? Or get the restricted 256 cam, which supposedly is also good for higher revving engines.
Also, imagine a 296 cam, 9/31 final drive, and short 1st gear, 17 inch tyres with Michelin Pilot Powers... I'm afraid I'll have to learn how to Wheelie...
-front end, is going to be an XTZ one like on the Legobike with stabiliser, only then with 320mm brake discs from mxtec, caliper brackets from he-motorradtechnik and a Brembo 16x18 radial brake-pump...
Also still would like to know fitting top yokes/triple clamps from other bikes/makes/after market, found eurotech 31426
http://www.eurotechmotorsports.com/details/images/BIG/31426.jpg if there are others let me know
-wheels, said earlier, 17 inches? front easily a 3.5x17" but the rear?
-carbs, allensperformance sells Keihin CR Roundslide Smoothbore carbs, I'm looking at these because I heard that boxers don not run well with Flatslides, comments on sizing etc welcome
-tank, for esthetic purposes I just bought a 26ltr tank on ebay, which is going to be painted silver/gray, together with the rest all black I think is a nice combination example here:
http://westerbaen.tweakdsl.nl/R65GS/800/BMW-R65_gs.jpg , and the bike is going to be used as my (own) company vehicle, being a computer repairman onsite/athome.
-tyres, well for now I just ordered a set of BT45 from rodamoto.net in spain (check m out, really cheap) I would have loved getting Michelin Anakee's but because of the 18" rear wheel... and if there are going to be 17 inches front and rear it's going to be Michelin Pilot Power
-side stand, the one from boxertoko/CTI seems to be the best, the original is fixed to the wider R80+ bars and with my engine being 6cm smaller in width... Saw that an R45 has different bars but actually I don't want any bars, have also found motobins Surefoot, but also atached to the bars
-airfilter, K&N? with or wihout modified arifilter box lid
-headlights, xenon from LEDSEE?
-suspension, well keeping an eye out on ebay for a WP shock, and with or without an XTZ front-end there are going to be progressive springs in the fork.
What I've done so far since I bought the bike is; small gearbox overhaul, 1 new exhaust thread, new piston rings, overhauled the trigger-unit, replaced carb needles jets needletubes pre-atomizer, new valves and seats, 1 helicoil in carter for cylinder bolt and filled up the caps on the carb lids, replaced timing chain and tensioners, and got me an original windscreen.
So please, give me your opinion on my thought up mods or maybe you have better mods/ideas, or know of parts, producers
