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idlesteve
Brolly Dolly
Brolly Dolly
Joined: 24 Feb 2019
Posts: 14
Location: Idle Bradford
PostPosted: Sat Mar 23, 2019 10:07 pm    Post subject: Bike ready for road but something bent? Reply with quote

Finished the budget cheap bike. New caliper seals, fork seals, new front tyre, all fluids etc. Serviced the Exup valve (but looked fine when I removed it).
Engine runs very sweet.



However, something is not right with the front end, I think the bottom yoke might be bent retard

The axle bolt was bent (managed to get it reasonably straight by placing in the lathe chuck and giving it a tap) looking for a good one if anyone has a spare.

The other problem is the distance between the discs and the fork legs, when the axle is tightened up the wheel twists slightly meaning there is about 3mm difference between each disc and leg (I wondered why the old pads were worn tapered when I took them out).

I took her for a spin up the road and noticed when in a straight line the top yoke is not straight (although the bike rides fine).

The fork tubes are straight (I checked this when replacing the seals by rolling them on the worktop) but only noticed things were not right when everything was bolted up.

The rear edge of the front mudguard is closer to the wheel on one side than the other.

I thought it had been down the road at some point as the fairing frame is a bit wonky.

What does everyone think? Try swapping yokes first?

Steve.
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Yamaha FZR1000 Exup 1989
Honda 400-4 1978
Honda CB750FD 1985
Honda VFR400 1992
Honda MB50 1982
Honda MT50 1981
Honda MBX50 1984
Honda MBX80LC 1885
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Stig
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PostPosted: Sat Mar 23, 2019 10:17 pm    Post subject: Reply with quote

If you slacken the fork clamp bolts off can you twist it straight then nip things up?
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Teego
More Rabbit Than Sainsbury's
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Joined: 14 Mar 2006
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Location: On the road again.
PostPosted: Sat Mar 23, 2019 10:31 pm    Post subject: Reply with quote

Stig wrote:
If you slacken the fork clamp bolts off can you twist it straight then nip things up?


My method is slacken bottom clamp bolts. Hold front wheel straight ahead between your knees. Move handlebars side to side a few times using sharp movements. Check all is good and tighten clamp bolts.
Of course this won't work if your yokes or headstock are damaged.
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idlesteve
Brolly Dolly
Brolly Dolly
Joined: 24 Feb 2019
Posts: 14
Location: Idle Bradford
PostPosted: Sat Mar 23, 2019 11:02 pm    Post subject: Reply with quote

Just been and had a go (plus point having an attached heated garage and the wife is out with her mates)!
looks a little better but won't know for sure until I go for a spin.
The back of the front mudguard is still out and the wheel still has uneven gaps (this could be due to the spindle not being perfectly straight). What worry's me is the force needed to bend the wheel spindle in the first place frown
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Yamaha FZR1000 Exup 1989
Honda 400-4 1978
Honda CB750FD 1985
Honda VFR400 1992
Honda MB50 1982
Honda MT50 1981
Honda MBX50 1984
Honda MBX80LC 1885
Honda C90 1976
Gilera 50 Enduro 1979
And some others in bits somewhere!
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yzfpaul
Commentary Team
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Joined: 21 Feb 2006
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PostPosted: Sun Mar 24, 2019 3:43 pm    Post subject: Reply with quote

that would worry me too steve, it might of had a front end whack and has been rebuilt with new forks only to make it look ok to the eye, if the axle is bent then the yolks headstock and frame maybe junk, take the tank off and look for creases in the frame spars at the headstock
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Teego
More Rabbit Than Sainsbury's
More Rabbit Than Sainsbury's
Joined: 14 Mar 2006
Posts: 2197
Location: On the road again.
PostPosted: Sun Mar 24, 2019 4:08 pm    Post subject: Reply with quote

yzfpaul wrote:
that would worry me too steve, it might of had a front end whack and has been rebuilt with new forks only to make it look ok to the eye, if the axle is bent then the yolks headstock and frame maybe junk, take the tank off and look for creases in the frame spars at the headstock


You need a new axle for starters. I'm guessing a slight misalignment would be magnified as you head north through the brakes to the yokes. It's not an area that you can bodge.
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Laissez les bontemps roulez.
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DISTANCE IS THE DRUG
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Brolly Dolly
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Joined: 06 Sep 2017
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Location: Chesterfield
PostPosted: Mon Mar 25, 2019 8:55 am    Post subject: Reply with quote

I have a spindle from a FZR 750/1000 Genesis which may or not fit also a set of fork clamps (well the whole triple tree) from the same bike. Let us know if you could use them.

Cheers.
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Stig
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PostPosted: Mon Mar 25, 2019 1:06 pm    Post subject: Reply with quote

Forks are narrower diameter on the Genesis so won't fit
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idlesteve
Brolly Dolly
Brolly Dolly
Joined: 24 Feb 2019
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Location: Idle Bradford
PostPosted: Tue Mar 26, 2019 12:28 pm    Post subject: Reply with quote

Frame looks fine, but I do think the yokes are twisted.
I'm going to strip it down and have a closer look.
Axle is scrap (as you tighten it up the wheel moves from side to side) so maybe interested in the FZR 750/1000 Genesis axle if it will fit?

At the end of the day the bike cost me 200 so I don't mind spending a quid or two to put it right. Didn't look too close when I first saw it as I wanted to get it away before he changed his mind. nod
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Yamaha FZR1000 Exup 1989
Honda 400-4 1978
Honda CB750FD 1985
Honda VFR400 1992
Honda MB50 1982
Honda MT50 1981
Honda MBX50 1984
Honda MBX80LC 1885
Honda C90 1976
Gilera 50 Enduro 1979
And some others in bits somewhere!
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Graham Crayon
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Joined: 19 Oct 2010
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PostPosted: Tue Apr 02, 2019 7:09 pm    Post subject: Reply with quote

I had this with my first Fazer 1000. Bottom yoke was bent which was easy enough to find once I took it off & placed it on a flat surface. Unfortunately for me a straight one still didn't solve the problem as the head stock was also bent! cry baby
Broke the bike for spares & bought another.
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nuggitt
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PostPosted: Sat Apr 13, 2019 7:47 am    Post subject: Reply with quote

Just found these on eBay. Any good to you?

FZR1000 front end

Cheap at the moment because he's just put them on. nod
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