race549 Posted May 6, 2015 Share Posted May 6, 2015 I read before about a common swap for the vfr with CBR900rr front end. Has anyone done this on their 4th generation? the CBR900rr front forks are a bit shorter by about 1", any compensation needed with the rear shock to maintain a correct geometry? thanks Link to comment Share on other sites More sharing options...
Scottay951 Posted May 6, 2015 Share Posted May 6, 2015 I'd go with a 929 or 954 front end, that way you'll get the USD forks and a 17 inch rim. I did a complete 929 front end swap and it was about as straight forward as it sounds, no surprises. It does drop the front end down a touch, which will change the steering geometry, but I'm not knowledgeable on that front since my bike has an aftermarket rear shock and is still in its project phase. Link to comment Share on other sites More sharing options...
750 Posted May 6, 2015 Share Posted May 6, 2015 Have you ridden it yet Scott? Link to comment Share on other sites More sharing options...
race549 Posted May 6, 2015 Author Share Posted May 6, 2015 Thank you Scottay951. I have a rebuilt CBR900RR front end with a 17" CBR600F3 rim so I don't want to spend on another front end. I guess we'll see how it feels. Link to comment Share on other sites More sharing options...
Veefer800Canuck Posted May 7, 2015 Share Posted May 7, 2015 They aren't USD but they are 45mm IIRC, so they should have less flex than the original 41mm forks. Being 1" shorter should lower the front end and effectively steepen the rake, making the steering quicker. Hopefully you won't have problems with the front cylinders/radiator,tire/fender. Link to comment Share on other sites More sharing options...
Scottay951 Posted May 7, 2015 Share Posted May 7, 2015 Have you ridden it yet Scott? I haven't, but I started re-installing the wiring harness a few days ago. School is finishing up this week so I should be able to work on it some more this coming weekend! Thank you Scottay951. I have a rebuilt CBR900RR front end with a 17" CBR600F3 rim so I don't want to spend on another front end. I guess we'll see how it feels. That doesn't sound half bad! The F3 rim will help out tremendously when looking for tires. The main reason I did my 929 swap was because my forks were toast from my crash and I found the 929 front end in a local salvage yard for $200. Work with what you have at your disposal, but like Canuck said, check and make sure that you'll have clearance with that new front end. Link to comment Share on other sites More sharing options...
V4 Rosso Posted May 7, 2015 Share Posted May 7, 2015 I read before about a common swap for the vfr with CBR900rr front end. Has anyone done this on their 4th generation? the CBR900rr front forks are a bit shorter by about 1", any compensation needed with the rear shock to maintain a correct geometry? thanks I know Kev (kgsmotorcycles) used to have it on his 4th gen and was very happy with it. The geomtry comes very close to stock as the offset is only 5mm off compared to 10mm of later USD forks. Link to comment Share on other sites More sharing options...
race549 Posted May 11, 2015 Author Share Posted May 11, 2015 thanks guys, I should have everything installed in a few weeks. I'll definitely check all the clearances. Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted May 12, 2015 Member Contributer Share Posted May 12, 2015 I read before about a common swap for the vfr with CBR900rr front end. Has anyone done this on their 4th generation? the CBR900rr front forks are a bit shorter by about 1", any compensation needed with the rear shock to maintain a correct geometry? thanks I know Kev (kgsmotorcycles) used to have it on his 4th gen and was very happy with it. The geomtry comes very close to stock as the offset is only 5mm off compared to 10mm of later USD forks. IIRC, I remember him saying he liked the 900RR front better than the USD (maybe 929). Thought part of it was that the frame was designed for conventional forks, and the USD don't flex as much. So the 900RR and 4th gen frame just worked better together, for him. Link to comment Share on other sites More sharing options...
TheStig Posted May 13, 2015 Share Posted May 13, 2015 U/D forks of say 50mm sit further apart and will cause less steering travel lock to lock, as I've found with my RC51 front end, which is similar to the later CBR954 and other U/D forks in dimensions. You can use an SP1 6 spoke front wheel on those too, which is useful as you may not want a 3 spoke front wheel... SP2 wheel is a lighter 5 spoke, but is more expensive to buy used. Reduced steering travel is only a pain when moving the bike around and not actually riding. I haven't found any significant problem pootling into a car park and turning into a spot, or doing U turns with feet on the pegs. Link to comment Share on other sites More sharing options...
race549 Posted May 21, 2015 Author Share Posted May 21, 2015 thanks for all the responses guys. I have had a few back and forth emails with Jamie Daugherty about it because I am also considering one of his 929 rear shocks (great guy and very responsive). His only concern with the shorter front end is an instability created in the front due to the decrease in trail. I am not sure there is any way of bringing the CBR forks to a stock VFR length without an expensive custom job for fork extensions or modified triples. At this point I'll probably just ride it once it's all bolted together and see how it goes. Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted May 22, 2015 Member Contributer Share Posted May 22, 2015 To increase trail, you can lower the rear (but don't forget that the CBR triples have less offset than your VFR's triples, which tends to increase trail.) Play around with Tony Foale's suspension kinematics program and see what you come up with. The demo version of the software lets you do quite a lot--do a search for my post on this subject. Ciao, Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted June 11, 2015 Member Contributer Share Posted June 11, 2015 Looking for info which USD+mastercilinder/brake lever+triples will fit on my 4th gen (I search but didnot find what I was looking for) -without having to change or cut into the front fairing -re-using the oem front wheel+rotors (keeping cost down) -limited fabrication (I will find someone to make spacers/turn down a front axle if needed; do not have the tools or skills to do this myself) For looks primarily I must admit but increased performance a bonus. With the exchange rate is it is, the JD cartridge internal are too expensive for me (and no gains in the looks department) Link to comment Share on other sites More sharing options...
SEBSPEED Posted June 11, 2015 Share Posted June 11, 2015 Only upsides to USD on our bikes are looks and radial brakes. Downsides - decreased turn radius, expensive to implement, expensive to replace parts, no brake upgrade if not radial, changing fork seals is a real mother unless you have the right tools which = $$ Link to comment Share on other sites More sharing options...
Member Contributer Switchblade Posted July 9, 2015 Member Contributer Share Posted July 9, 2015 Here go a guy on VFRWorld has it for sale mite have some good info.http://vfrworld.com/classifieds/showproduct.php?product=6047&title=1993-vfr-750&cat=1 Got to be better . Link to comment Share on other sites More sharing options...
RVF440 Posted July 11, 2015 Share Posted July 11, 2015 I have the 900rr 45mm front forks in my daily ride flush with top yoke and the rsv mille rear shock +5mm on the ride height and have no issues whatsoever. Great mod well worth for little money!! Link to comment Share on other sites More sharing options...
0utlaw Posted October 18, 2015 Share Posted October 18, 2015 I have the 900rr 45mm front forks in my daily ride flush with top yoke and the rsv mille rear shock +5mm on the ride height and have no issues whatsoever. Great mod well worth for little money!! Hi. Did you used the yokes and clipons from the 900RR? Is there any info on what parts needed to do this properly? (i´ve searched for it but didn´t find) Thanx guys. Link to comment Share on other sites More sharing options...
dogman Posted October 19, 2015 Share Posted October 19, 2015 I have RC51 forks and front wheel, discs and brakes, 954 top and bottom triples, CBR600 F41 brake master cylinder and helibars to suit the 50mm fork legs. Only downside is as said above triple clamp offset is 30mm as opposed to 40mm for VFR which increases trail and slows down turn in so to compensate raise rear (I have wilbers 641 with ride height adjustment adjusted to max) and slide forks up 10mm through triples to drop front a bit more and all is good now but you need to watch clearance at max fork travel. (clearance between top of front fender to oil cooler and radiator) Link to comment Share on other sites More sharing options...
750 Posted October 20, 2015 Share Posted October 20, 2015 I have RC51 forks and front wheel, discs and brakes, 954 top and bottom triples, CBR600 F41 brake master cylinder and helibars to suit the 50mm fork legs. Only downside is as said above triple clamp offset is 30mm as opposed to 40mm for VFR which increases trail and slows down turn in so to compensate raise rear (I have wilbers 641 with ride height adjustment adjusted to max) and slide forks up 10mm through triples to drop front a bit more and all is good now but you need to watch clearance at max fork travel. (clearance between top of front fender to oil cooler and radiator) Hey man, slightly off topic, what size if the F4i master cylinder? I need a 16mm for some brembo brakes I have... Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted October 20, 2015 Member Contributer Share Posted October 20, 2015 F4i should be marked 5/8", so 0.625" or 15.87mm, so you're probably as close as you're going to get with OEM parts. Ciao, Link to comment Share on other sites More sharing options...
750 Posted October 21, 2015 Share Posted October 21, 2015 Thanks mate. How's things? Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted October 22, 2015 Member Contributer Share Posted October 22, 2015 Not too bad. I've been commuting to work a few days a week on my FP. I probably ride near your neighborhood around 6:45am, MWF, on my way from Blackheath to London Bridge. Now we're off topic! Ciao, Link to comment Share on other sites More sharing options...
750 Posted October 22, 2015 Share Posted October 22, 2015 But your bike may or may not have cbr forks, so still on topic! If you go down Evelyn street, then you'll pass my flat. I don't head out that early though thankfully. Now properly back on topic, I'm looking at 4th gens to mod into a naked bike next year. One I've seen has the firestorm front end in it's entirety. The forks are the same diameter as the VFR's if I'm not mistaken? Thinking they look a bit weasley for a naked bike so may go down the fireblade front end route. I could have bought a big bang R1 front end for £400 a few weeks back (ALL of it!) but I didn't have the spare cash to go through with it. Gutted! Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted October 22, 2015 Share Posted October 22, 2015 2005 yamaha r1 front end cbr954 triple trees 2mm disc and axle spacers the r1 forks are more than long enough,even with the clip ons mounted above the triples. Link to comment Share on other sites More sharing options...
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