New bike issues (not VTR)

[Miztaziggy]

I have had the new GSXR in the garage for the last couple of weeks, the guy hasnt had much time to look at it as he's been busy, but called in today to check on progress....

Issues:

Front wheel bearing totally shot. One of them literally had half the ball bearings missing and was burnt out from friction....he has changed them



Front right disc slightly warped but only very slightly and not worth worrying about

Tyres are flattened off really badly, but I knew this anyway and was planning on a new pair for the track anyway

Frame / head / something is out of alignment. He says it's about 0.5 - 1cm out. The front wheel is slightly to the right of the back wheel. He said he wouldn't pass it on an MOT, but most testers would as they don't check....can anyone verify this?
- Also can anyone recommend any MOT testers in the Leeds / North area
- Also can anyone recommend how and where to get this sorted out? The mechanic said it will most likely be something fairly simple like the bottom yolk out slightly. He reckoned that putting on a jig or something and doing the work required wouldn't cost more than £200 or so. He also said he didn't think it would affect the handling much. He runs a race team and used to be a Honda team mechanic so should know his stuff.

Head bearings were OK, brakes and fluids were OK, chain and sprokets were OK.

[lumpyv]

fair from an expert me but my back wheel was out and I corrected with the chain adjuster and a bit of string tied from something solid in front of the bike to line it up with the front ?

probably not as simple as that? but good luck sorting it out

[Miztaziggy]

I think it's out of line even when parallel if you know what I mean.

Rather than like:

..|..
..\..

It is like:

..|..
...|.


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[lumpyv]

would that be a problem with spacers then ??

someone will be along with some help in a bit

[popkat]

0.5-1cm is nothing, it could easily be out from the factory, many are and most race teams get brand new frames jigged to check. I assume he's taking the measurement from the tyre as if he took it at the headstock he would need to have a jig, if the measurement is at the tyre then at the headstock it would be very little.

As for MOT, I'm an mot tester and if the alignment is out I then test ride the bike (like you should) if it rides ok then I would pass and advise.

I'd be more concerned about the disc as a warped disc can make the whole bike shudder under hard braking (like on track) but before buying a new disc try cleaning and rotating the disc bobbins as well as giving the disc a good clean up with some wet and dry, also clean the scraper holes in the disc out. make sure the pads are in good condition, not just plenty of meat but not corroded or pitted. do all that and you might find it's ok, it's worth a try.

[popkat]

Just looked at your little diagram, if the wheel is offset like you say, check the front wheel is in the right way round and also that the spacers are in the correct side, when you look at the calipers from the front the disc should run pretty much down the middle, if somethings a miss you should notice.. maybe the mechanic put the wheel in wrong ? It's easily done.

But like I said 0.5-1cm really is hardly noticeable without measuring and I can't see it being a problem.

I have a bike that offset about an inch and a half, it rides fine

[Miztaziggy]

Ok good to know. It is at the tyre yes.

As for the brakes I will give that a go. He did say it was only very slightly out which shouldn't cause too much of a problem. But thank you for the tips :-)

Im not 100% sure but I think it was you popkat that suggested a k4 in the first place and why I went for one :-)

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[Miztaziggy]

Just looked at your little diagram, if the wheel is offset like you say, check the front wheel is in the right way round and also that the spacers are in the correct side, when you look at the calipers from the front the disc should run pretty much down the middle, if somethings a miss you should notice.. maybe the mechanic put the wheel in wrong ? It's easily done.

But like I said 0.5-1cm really is hardly noticeable without measuring and I can't see it being a problem.

I have a bike that offset about an inch and a half, it rides fine

I finally got the bike back from the mechanic on Saturday. It's taken ages, mainly because he has just taken so long to get round to sorting it.

Anyway while I was there I ordered a Ktech spring for it which he said would improve things handling wise since the back feels too hard.

When I got it home I checked the wheel alignment myself.

I put two long straight metal bars on the back wheel and I can see the front wheel is definitely out.

When I looked closely, I can actually see that the front wheel is off to the left hand side of the bike by about a centimeter. If I look at the front wheel dead on and draw an imaginary line up the centre, that line doesn't go through the centre of the nose, it's offset. I used a laser plumb line to measure it and it's off by 1cm.

The mechanic said that he thinks the forks are straight since the front axle goes straight in without any tightness, and the axle itself is straight.

The top yolk looks to be in the centre and measures equal distances from each side of the fairing.

So all that's left is the bottom yolk?

Does anyone know of anywhere I can take the bike to be put on a jig and straightened?

[popkat]

Off set or at an angle ?, if it's off set check the spacers on the front wheel are in the right way round, they maybe different lengths, look if your discs are evenly spaced to the forks and are running central in the calipers. I still think the amount your saying it's out by isn't too bad as long as the bike rides ok. have you tried adjusting the rear wheel to straighten it up, could also be the chain adjuster markers are a little out, not un common. As for frame straighteners the best I know of is Maidstone motorliner centre, a bit too far from you I think.

[nt1980]

You dont need a jig just two long straight metal bars drill through one side and put some threaded bar through
this sits on the back wheel drill the next one bolt it these then should run true towards the fron and measure of the front wheel sorry im crap at explaining il try make a diagrham



Sorry suck at cad drawings to

[Wicky]

Code: Select all

[img]http://i740.photobucket.com/albums/xx41/nt1980/rubishcaddrawing_zps14aa8c8c.png[/img]

edit - you sussed it

[nt1980]

Ty Wicky

[Miztaziggy]

Off set or at an angle ?, if it's off set check the spacers on the front wheel are in the right way round, they maybe different lengths, look if your discs are evenly spaced to the forks and are running central in the calipers. I still think the amount your saying it's out by isn't too bad as long as the bike rides ok. have you tried adjusting the rear wheel to straighten it up, could also be the chain adjuster markers are a little out, not un common. As for frame straighteners the best I know of is Maidstone motorliner centre, a bit too far from you I think.

No it's offset not at an angle.

The spacers on the front are correct, the discs are bang on in both calipers. I measured the wheel itself and it's bang on in the middle of the forks, but the centre of the wheel isn't in the centre of the bike.

As I say if I use a laser plumb line on the front wheel, it draws a laser line right up the centre of the front wheel and this hits the nose of the fairing about 1 cm to the right of the centre.

Yeah I have checked the back wheel and it's definitely not that out of line...sadly I think it's the headstock / frame. Track day booked on the 12th May, just hoping that it holds up.

You dont need a jig just two long straight metal bars drill through one side and put some threaded bar through
this sits on the back wheel drill the next one bolt it these then should run true towards the fron and measure of the front wheel sorry im crap at explaining il try make a diagrham

I have also done this with 2 long straight pieces of wood.

It's quite clear and obvious that it's offset to the left when I do this.

As I say though I measured the top yolk and that appears to be dead in the middle of the bike. Can't get at the bottom one to measure, but I assume it must be that one that's out somehow. Can't really see how though, it's connected to the headstock of the frame, which must mean, if the bottom yolk is throwing the forks out of centre, the headstock on the frame isn't quite straight.....it isn't quite vertical. It wouldn't need to be out by much to throw the forks out to the side by 1cm.


Say the bottom of the forks are 1cm out, and the forks are 1m long, the angle between vertical and the line of the forks would be 0.57 deg out (inv Sin (1/100))

If the bottom yolk is say 100mm from the top yolk, then the bottom yolk would be off centre by about 1mm (10 * Sin(0.57)) - that's not really a lot to measure.

[nt1980]

I see what your saying so there it could be possibe may bottom yolk bearng issue or the frame is slightly out

a friend of mine had a similar issue with his r1 frame that was slightly out and aparentley had this straightened by this company its quite exspensive il found out the name he races in bemsee club