Bimota Forum

[brian]

[Evilchicken0]

You might need to raise the front and slacken the triple clamps to allow the fork bottoms to move a bit more - maybe
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Don't read everything you believe

[2bims]

Thats a fair point from EC....they may be a little out of alignment right to left.....causing it to be tighter due to out of alignment

When I first stripped down the pup...I didnt have a spanner/socket suitably sized for the front spindle.....so I removed the forks and wheel in their entirety.....then left the bolts on the spanner end of the spindle clamp "tight" and used the fork legs for leverage to unscrew it from the opposite end....albeit on the Ducati theres an inner threaded sleeve that I left tight also....this may give you the leverage and ability to loosen the spindle....

[brian]

It's possible, and worth a try. Although with the pinch bolts loose, the axle turns in the fork legs without too much force.
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851

[Bud977]

Is it a simple through axle where it screws into the opposite fork leg without a nut on the end? The fat end where the inhex is would then have a clamp locking screw. That's what it looks like from the few photos I could find.

[brian]

[2bims]

Doesnt sound good Brian if its turning after loosening the pinch bolts but not removing.....does take quite a few turns....but yeh....the end of the spindle is threaded to go in to the threaded hole on the bottom of the left fork leg....so after loosening the pinch bolts it should unscrew anti-clockwise and remove......wish you luck that if one part has lost its thread and stripped itself...that its the spindle and not the bottom of the LHS fork leg...

Bimototo on here (DB4 Owner) had his bike up for sale in for sale section....but has now broken it into parts and is selling the bits of separately.....so theres an oppurtunity....

[brian]

I might be missing something here Steve? Are you saying that the axle screws directly into the r/h fork leg? I've been assuming that there is a threaded collar on the r/h side that the axle screws into and the threaded collar is held in the fork leg by the pinch bolts. Don't suppose you have a picture of the axle from a parts book?
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851

[2bims]

Hi Brian....still trying to figure it out....Dont have the spare parts disagrams for this bike...just the workshop manuals....what confuses me is ....as you rightly say...theres only spindle/axle securing/clamp bolts on one of the fork legs and not the LH sppedo drive assembly side....normally on forks theres clamp bolts on both sides...one to hold a threaded collar and one to hold the threaded spindle. Dia 38/3 on page 32/3 says loosen the 2 No. screws on the RHS fork leg , that fix the pin...and then loosen and remove the pin. Dia 43/3 on page 36/3 shows a hex head on the LHS speedo drive side leg...theres no securing pins on this leg...that I know....so if the whole thing is turning then this side would need holding whilst turning the other side as theres nothing to clamp and secure this side

Its not "normal" to have a threaded fork leg...and I hope there isnt....just cant see how it works with only one fork leg that has securing pins

Heres pictures of my DB4 from both sides.....unlike Dia 43/3....theres no hex head on the LHS fork leg on mine....just the end of the threaded spindle showing....and a square headed end of the spindle on the RHS....seems to show that its threaded into the LHS leg...but for the life of me I cant recall....has to be threaded in there somewhere or you'd never achieve a tightening torque/clamping onto the bearings

[brian]

The l/h speedo side has a 10mm inhex. I'm guessing the axle shaft goes in from the l/h side and butts up to a shoulder and screws into the threaded collar on the r/h side which is then secured by the pinch bolts
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851

[brian]

And I think my problem is that the threaded axle shaft is seized (or very tight) in threaded collar
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851

[Evilchicken0]

I'd have thought the spindle would unscrew from the right where the locknut is. Some bikes have a threaded fork leg and because that doesn't have a pinch bolt it looks like that's what's used here.
Steel into alloy without coppaslip ?
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Don't read everything you believe

[vort28]

Right, just so we are all aligned, RHS and LHS are when sitting on bike ?

RHS fork leg has pinch bolts and hold the stepped axle head that has the square machined on it.

LHS fork lower is threaded. Unlike the SB6 you have that has a plain axle and a bolt cap that the axle bolts into the DB4 axle screws directly into the fork lower.

Now I am guessing that as your axle spins with the pinch bolts loosened that the threads are stripped in the LH fork lower , and the axle is rusted into the wheel bearings !! Sorry Brian.

[Bud977]

I reckon you're correct Vort. It looks like the axle comes out the RH pinch bolt side. The LH fork leg is threaded.

When tightening up this set up, you do up the stepped axle to pull the spacers and bearings tight, then do up the pinch bolts after that leg has found its natural position.

Brian, if you've been trying to turn the LH end of the axle anti-clockwise by th inhex to undo it, you've actually been tightening it.

[brian]