dubsey Posted August 5, 2011 Report Share Posted August 5, 2011 I just got my YZR500 replica on the road I seem to be having low speed handling issues ? I have to keep adjusting the bars continuously , almost like a weave but not ? Under acceleration all is fine but not really at a constant speed not been above 60mph I have an R1 5vy front end And an R6 2co rear end I believe these to be setup as standard The tyre pressures are 34 40 F to R supercorsa tyres 120 f 160 r have set the static sag although cant remember numbers any pointers gratefully recieved cheers Link to comment Share on other sites More sharing options...
ronenige Posted August 5, 2011 Report Share Posted August 5, 2011 Steering head bearings , dodgy steering damper try these first , hth Link to comment Share on other sites More sharing options...
dubsey Posted August 5, 2011 Author Report Share Posted August 5, 2011 thanks for reply There doesnt seem to be any noticeable movement on the bars to indicate loose head bearings, how tight should they be ? or loose ? : The steering damper is an ohlins on minimum setting, i did remove it earlier but the problem was still there Link to comment Share on other sites More sharing options...
ronenige Posted August 6, 2011 Report Share Posted August 6, 2011 Head bearings sound like they might be tight , try backing them off slightly see if it makes a difference , if it doesn't then follow MM's suggestion Link to comment Share on other sites More sharing options...
dubsey Posted August 6, 2011 Author Report Share Posted August 6, 2011 Took the head bearings out and regreased, retightened all ok Handling issue still persists Had someone else ride it today He said it felt like a flat tyre, I do agree somewhat, he also checked the bearings to see if they were tight , not that So will work through MM's suggestions, to be honest dont really understand modern suspension so will have to start learning again on another note the carburation needs looking at too, but this I understand so no doubt i will play with carbs first with the handling, i suppose the answer is not to ride slow Link to comment Share on other sites More sharing options...
monty_zac Posted August 6, 2011 Report Share Posted August 6, 2011 You have a 160 tyre on an R6 rear wheel? Or did you mean 180? Guess if its a 160 that's the issue solved right there. Link to comment Share on other sites More sharing options...
speedy sie Posted August 6, 2011 Report Share Posted August 6, 2011 if you are using them rgv500 mag yokes on the road,you are a brave man!!!.....20 year old magnesium.....have you had them x rayed?? Link to comment Share on other sites More sharing options...
dubsey Posted August 6, 2011 Author Report Share Posted August 6, 2011 You have a 160 tyre on an R6 rear wheel? Or did you mean 180? Guess if its a 160 that's the issue solved right there. Its a 5.5 inch rim 160 tyre fits fine and have no room for a 6 inch rim and 180 tyre i have that combination sitting in the corner of workshop Link to comment Share on other sites More sharing options...
dubsey Posted August 6, 2011 Author Report Share Posted August 6, 2011 . Link to comment Share on other sites More sharing options...
dubsey Posted August 6, 2011 Author Report Share Posted August 6, 2011 if you are using them rgv500 mag yokes on the road,you are a brave man!!!.....20 year old magnesium.....have you had them x rayed?? They are R1 5vy modded to suit Link to comment Share on other sites More sharing options...
Cibbersicks Posted August 7, 2011 Report Share Posted August 7, 2011 You have a 160 tyre on an R6 rear wheel? Or did you mean 180? Guess if its a 160 that's the issue solved right there. 160 as standard dude, all modern 600's have these off the shelf As for the tyre pressure I'd imagine (reading your other thread it weighs 173kg) 40psi in the back should be about right for the road? Link to comment Share on other sites More sharing options...
Kayla Posted August 7, 2011 Report Share Posted August 7, 2011 I'd start with the tyre pressures, it's a quick and free way to fix the problem (if it is the tyre pressures). I use 33/36 on my FZR4/6 (160-ish kg) with 120/70 and 160/60 tyres, and put the right size tyre on the right size rim! Link to comment Share on other sites More sharing options...
DRMAC Posted August 7, 2011 Report Share Posted August 7, 2011 I would try 33/36 pressures, Have you got the forks and rear shock to the standard rebound/compression settings ?(r1 front settings, r6 rear settings).I have done a front and rear end swap on my trx and started to set it up like this.If you still have problems it may be worth taking it to either a suspension specialist or nip in to a trackday as they normally have a suspension guy on site and get them to give you a base setting for the road. Link to comment Share on other sites More sharing options...
Chrisball Posted August 7, 2011 Report Share Posted August 7, 2011 A 5.5 inch rim should be running a 180 tyre. That would be what should be used in a R6 swingarm. HOw can there be clearance issues?? A 160 would be strethched to go over a 5.5 rim surely?? Link to comment Share on other sites More sharing options...
scrappy600 Posted August 7, 2011 Report Share Posted August 7, 2011 160 as standard dude, all modern 600's have these off the shelf As for the tyre pressure I'd imagine (reading your other thread it weighs 173kg) 40psi in the back should be about right for the road? Are you sure? Could have sworn my rr was 180? The big thing amongst ss600 racers here is whether or not to go 190 for the extra width sacrificing turn in? I'd have put money on 180 being the norm before you posted that? Link to comment Share on other sites More sharing options...
monty_zac Posted August 7, 2011 Report Share Posted August 7, 2011 160 as standard dude, all modern 600's have these off the shelf Steel framed CBRs are about as modern as at gets with 600s running 160s? Unless I am missing something in your meaning? Link to comment Share on other sites More sharing options...
dubsey Posted August 7, 2011 Author Report Share Posted August 7, 2011 Looks like I cocked up Will swap the 180 on to the 5.5 Had the 180 on the 6.0 think this could be why I had the clearance issue Will see how this works out Good to see most opinions are similar Could I try a 170 on the 5.5 ? For my info what effect have i caused by doing this and why is it affecting the front so much ? Thanks guys Link to comment Share on other sites More sharing options...
dubsey Posted August 7, 2011 Author Report Share Posted August 7, 2011 A 5.5 inch rim should be running a 180 tyre. That would be what should be used in a R6 swingarm. HOw can there be clearance issues?? A 160 would be strethched to go over a 5.5 rim surely?? The clearance issues are with the chain, its a 3ma frame which is quite narrow, so the chain run is very close to the tyre and also the frame Link to comment Share on other sites More sharing options...
Kayla Posted August 8, 2011 Report Share Posted August 8, 2011 The clearance issues are with the chain, its a 3ma frame which is quite narrow, so the chain run is very close to the tyre and also the frame Maybe use a 160 on a 5" instead? You don't want to be tooling into a left-hander with flung chain lube on the edge of the tyre... Link to comment Share on other sites More sharing options...
dubsey Posted August 8, 2011 Author Report Share Posted August 8, 2011 Have put the 180 on the 5.5 no clearance issues should have used this combination sooner will see if the handling improves when the weather does Link to comment Share on other sites More sharing options...
speedyandypandy Posted August 8, 2011 Report Share Posted August 8, 2011 For my info what effect have i caused by doing this and why is it affecting the front so much ? Thanks guys The same as going from a 180 to 190, a bit better acceleration, but harder turn in. If you can get a hold of some used but not used up tires, you can change them back and forth to test, and see what you like best.... Link to comment Share on other sites More sharing options...
YZ faybo Posted August 8, 2011 Report Share Posted August 8, 2011 Not sure it helps But used to run a 160 on a 5,25 and a 160 & 165 on a 5.5 on 250's no tire deformation issues, most manufactures list what size there tire will fit what size rim. In supermoto we run 160/165/170 on a 5/5.25/5.5 Maxxis made there 160 supermoto tire to work froma 4.5 to 5, you will be surprised what has been designed to work on larger than you think rims. My 600 has 125/80 on a 3.5 front and 195/65 on a 6 rear the tires have taller profiles great side grip but no chain clearance issues as they are designed for this. Link to comment Share on other sites More sharing options...
cagimaha Posted August 8, 2011 Report Share Posted August 8, 2011 1990 GSXR750's used a 170 section tyre on a 5.5" rim so it's a possibility. This link shows the reccomended rim/tyre compatability: www.mediafire.com/?w7ke0q2t3dx7tz9 Link to comment Share on other sites More sharing options...
dubsey Posted August 18, 2011 Author Report Share Posted August 18, 2011 Put the 180 on Set the suspension to standard yam settings Bike felt a bit better But still not quite there to get to standard settings I adjusted the rear preload one step softer All the other settings were within one or two clicks As the bike felt better with less preload on the back Would I be right in thinking some of the weight has come off the front ? And if I lower the rear ride hieght, would this be the right direction ? Or have I confused myself more ? Link to comment Share on other sites More sharing options...
Cibbersicks Posted August 19, 2011 Report Share Posted August 19, 2011 No I am indeed talking shit... All modern 600 Supersports run 180's... Move along nothing to see here... Link to comment Share on other sites More sharing options...
Cibbersicks Posted August 19, 2011 Report Share Posted August 19, 2011 Are you sure? Could have sworn my rr was 180? The big thing amongst ss600 racers here is whether or not to go 190 for the extra width sacrificing turn in? I'd have put money on 180 being the norm before you posted that? Yeah... see post above ^ The R6 wheel running a 180 has probably sorted out most of the issues. Link to comment Share on other sites More sharing options...
EvilSpike Posted August 19, 2011 Report Share Posted August 19, 2011 Have you tried swapping the bar end weights for ones heavier or lighter? I know it dosen't sound like much to help, but often these wobbles are set up by resonance so just adding or subtracting a little weight push whatever is wobbling out of the "right" frequency. Admittedly, this masks the problem, but then most bikes have bar end weights for this very purpose... Link to comment Share on other sites More sharing options...
lorenzo Posted August 19, 2011 Report Share Posted August 19, 2011 Set the sag first off, then tweak damping. Link to comment Share on other sites More sharing options...
svingel Posted August 20, 2011 Report Share Posted August 20, 2011 Wheels straight, ballanced, in line? Just a theory, could the increased gyro scopic forces at higher speed, add stability, and and mask the problem? If it's related to my aforementioned babble? Link to comment Share on other sites More sharing options...
dubsey Posted August 21, 2011 Author Report Share Posted August 21, 2011 Low speed problem sorted What a pleasure to ride Just need to sort carburation Took the yokes out again cleaned and repacked with grease put back together Torqued to 50nm released retorqued 20nm Dropped forks 5mm Link to comment Share on other sites More sharing options...
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