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TWIGGY - DB4 Trackbike
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 30, 2014 2:34 pm    Post subject: Reply with quote

Thanks!
Seems that my RH chainadjuster have not yet passed the complete manufacturing process. Wink

Is it some kind of spacer between the LH chainadjuster and the chain wheel carrier ?

deebee4 wrote:
2bims wrote:
Confirmed...spacers are on the disc side......and the brake caliper bracket goes over it....the threaded insert is so that the wheel can be centered properly for chain alignment....either pulling in the swingarm...or pushing it out


Threaded part of the caliper bracket assembly goes in the RH chain adjuster and will stay there. Has to be tightened all the way. So when adjusting the chain the complete assembly will slide towards the front or to the rear. The hexagon part (the nut) will rest on the rear wheel bearing when the rear axle is tight.
So you might have to have the threads made in the RH chain slider.

Removing rear wheel means removing rear caliper only (hang it to the side). Chain wheel carrier and wheel will ease out when rear axle is removed. Brake caliper bracket will stay in place with the chain adjuster.

Warning: do not tighten the rear wheel axle with the specified torque of over 100 NM. That will quickly strip the threads in the LH chain slider. But it looks as if your LH adjuster has a steel thread insert while mine screws into the bare aluminium.....

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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 30, 2014 2:37 pm    Post subject: Reply with quote

A picture or confirmation by looking at actual DB4 would be very helpful.
I really do not trust the italien partlist or workshopmanuals being Bimota or Ducati.

brian wrote:
I'll be home from work tonight so can check my stock db4 and answer some of your questions tomorrow. I'll post some pics for you if you like.

From memory the engine spacers are on the right side


deebee4 wrote:

Nope, the spacers go on the LH side. See spare parts list picture 17 item nr 15.

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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 30, 2014 3:25 pm    Post subject: Reply with quote

hnracing wrote:
A picture or confirmation by looking at actual DB4 would be very helpful.
I really do not trust the italien partlist or workshopmanuals being Bimota or Ducati.

brian wrote:
I'll be home from work tonight so can check my stock db4 and answer some of your questions tomorrow. I'll post some pics for you if you like.

From memory the engine spacers are on the right side


deebee4 wrote:

Nope, the spacers go on the LH side. See spare parts list picture 17 item nr 15.


Before I posted that the spacers were on the LH side I checked it on my db4. The bike is always inside the garage in my house. 10 meters from my bedroom. Now you know where I spend the night when I can't catch the sleep and don't want to disturb the misses.... Wink
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 30, 2014 3:31 pm    Post subject: Reply with quote

Very Happy
You are the best!

Unfortunately that means I have 5mm less space for my RH spark plug on the vertical cylinder.
Will have to source a alternative sparkplug boot and remove some part of the cambelt cover.

deebee4 wrote:
hnracing wrote:
A picture or confirmation by looking at actual DB4 would be very helpful.
I really do not trust the italien partlist or workshopmanuals being Bimota or Ducati.

brian wrote:
I'll be home from work tonight so can check my stock db4 and answer some of your questions tomorrow. I'll post some pics for you if you like.

From memory the engine spacers are on the right side


deebee4 wrote:

Nope, the spacers go on the LH side. See spare parts list picture 17 item nr 15.


Before I posted that the spacers were on the LH side I checked it on my db4. The bike is always inside the garage in my house. 10 meters from my bedroom. Now you know where I spend the night when I can't catch the sleep and don't want to disturb the misses.... Wink

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2bims



Joined: 03 Apr 2010
Posts: 5332

PostPosted: Tue Dec 30, 2014 5:34 pm    Post subject: Reply with quote

It looks like in one of your photos that you have the rear caliper hanging bracket also...made of 8mm think plate....here are some pictures of the DB4 rear end.....and a few measurements


It all comes down to what rear wheel you are going to use....the sprocket cush drive...and size of rear disc...standard Bimota Antera wheels have a 230mm diameter rear disc that works with that caliper bracket....I think you are missing another spacer for the right side disc side......the left side sprocket side has another spacer that push fits into the pair of bearings that fit inside the cush drive assembly....and then presses on the outer race bearing surface...to be clamped tight against the chain adjuster.....












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bidalot



Joined: 14 Feb 2012
Posts: 69
Location: Paris

PostPosted: Tue Dec 30, 2014 6:11 pm    Post subject: Reply with quote

hnracing wrote:
Got some more new parts for the build.
Chainslider


Hi Hnracing,

Where did you found the chainslider ? I'm looking for it for months...

Cheers
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 30, 2014 7:41 pm    Post subject: Reply with quote

Looks like your rear caliper bracket assembly is complete except for the correct chain adjuster.

It consist of 3 parts: the collar that fits tightly over the threaded bush (with hexagon on the other end), the bush and - sandwiched in between - the actual caliper holding plate.

You might be able to have the correct thread cut into the inner side of the RH chain adjuster. Is is a "detachable" bush? That should do the trick, provided it has the right dimensions.

On the other hand: when you cut off the threaded part from the bush and just stack everything (chain wheel carrier, wheel and caliper bush&bracket) on the rear axle it shouldn't be a problem too and you even can remove the rear wheel without the need of taking the rear caliper off its bracket.

Just make sure the wheel alignment is spot on when shimming everything up. That will improve handling characteristics.

If you want to I can measure it up after I've taken the wheel out this weekend

http://hexengineering.se/wp-content/uploads/2014/12/DB4_rearcaliperspacer_b.jpg
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 30, 2014 7:49 pm    Post subject: Reply with quote

bidalot wrote:
hnracing wrote:
Got some more new parts for the build.
Chainslider


Hi Hnracing,

Where did you found the chainslider ? I'm looking for it for months...

Cheers


Double sided chain slider is obligatory on the db4 because the lower chain run will grind away the underside of the swing arm. Even into the two 6 mm clamping bolts...... Especially with the stock 38Z rear chain wheel. The white single sided item does not prevent this. That means repairing/welding on the swing arm, already been through that.
However, the original black item is made of very soft material that either cracks easily or/and wears out very quickly.
So a good alternative is better, I got mine from a fellow db4 rider from Germany who had it made from a hard plastic profile, and this one lasts.
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 30, 2014 7:57 pm    Post subject: Reply with quote

hnracing wrote:


Unfortunately that means I have 5mm less space for my RH spark plug on the vertical cylinder.
Will have to source a alternative sparkplug boot and remove some part of the cambelt cover.


Well, you could try to fit the spacers on the RH side if that would work better for you. Chain alignment will not be disturbed because the swingarm is attached to the engine block itself.
But you could run into a problem with the rear shock being out of true and that will wear out the shock rapidly. Also wheel alignment will have to be checked.

But: if you don't try you don't know...... Wink
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 30, 2014 10:23 pm    Post subject: Reply with quote

bidalot wrote:


Hi Hnracing,

Where did you found the chainslider ? I'm looking for it for months...

Cheers


I have sourced the chainslider, chainadjuster and the hanger from
http://www.bimota-teile.de

/Henrik Nygren
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 30, 2014 10:33 pm    Post subject: Reply with quote

I will try to do it as original as it goes, not to mess it up to much.
So if you have the spacer on the left side of the engine so will I.
Same with the caliper bracket spacer. Just a matter to thread the chainadjuster
With M25 threads.
But it really all depends on how my rear mag wheel will fit.
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 30, 2014 10:40 pm    Post subject: Reply with quote

deebee4 wrote:


Double sided chain slider is obligatory on the db4 because the lower chain run will grind away the underside of the swing arm. Even into the two 6 mm clamping bolts...... Especially with the stock 38Z rear chain wheel. The white single sided item does not prevent this. That means repairing/welding on the swing arm, already been through that.
However, the original black item is made of very soft material that either cracks easily or/and wears out very quickly.
So a good alternative is better, I got mine from a fellow db4 rider from Germany who had it made from a hard plastic profile, and this one lasts.


Ooops!
I am running 15/37 right now.
I have a close ration gearbox from 749.
Any hint of what kind if material it is made of?
/Henrik
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Wed Mar 04, 2015 9:14 am    Post subject: Reply with quote

Progress have been made! Smile
New engine bolts and spacers.
Spacers for the swingarm.
New 17mm rear wheel axle and spacers to line up standard Ducati spec rear wheel.
Pictures will follow during weekend.

Need some help with the suspension base setup for the DB4.
* Rear damper length from eye bolt to eye bolt.
* Distance from front axle, along the fork, to the underside of the lower triple clamp/yoke.
*Distance from underside of the lower triple clamp/yoke to the frame where the lower steering bearing is.
Please make a note if the measurement is done under loaded or unloaded
conditions. (with bike weight or with the wheel in the air)

Thanks!
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Fri Sep 11, 2015 9:43 pm    Post subject: Reply with quote

hnracing wrote:
Progress have been made! Smile
New engine bolts and spacers.
Spacers for the swingarm.
New 17mm rear wheel axle and spacers to line up standard Ducati spec rear wheel.
Pictures will follow during weekend.

Need some help with the suspension base setup for the DB4.
* Rear damper length from eye bolt to eye bolt.
* Distance from front axle, along the fork, to the underside of the lower triple clamp/yoke.
*Distance from underside of the lower triple clamp/yoke to the frame where the lower steering bearing is.
Please make a note if the measurement is done under loaded or unloaded
conditions. (with bike weight or with the wheel in the air)

Thanks!


Ever got an answer to your questions? I can do some measurements, because now it's on the bike lift and paddock stands.
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Fri Sep 11, 2015 9:59 pm    Post subject: Reply with quote

Last Monday Very Happy


The old silver Anteras are rain wheels now...


But still more fun in the dry

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