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TWIGGY - DB4 Trackbike
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hnracing



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

PostPosted: Tue Dec 02, 2014 9:50 pm    Post subject: Reply with quote

Rear brake setup
Have anyone tried to mount the rearbrake mastercylinder to the engine like Ducati do?
Will the distance from the pedal to the rearseat be ok?

Like this one?


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Monster 1100 -96 for the road / 1100SS for the track / DB4 new track project
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2bims



Joined: 03 Apr 2010
Posts: 5338

PostPosted: Tue Dec 02, 2014 10:44 pm    Post subject: Reply with quote

All depends on what footpegs and hangers you have or intend to use...as evidently they are one and together on DB4's with the master brake mounted on also....cant see ahy it would be a problem as long as you can reach the brake lever from whatever footpegs and hangers you intend to fit

Bimota went back to the Ducati system on the DB5....reverse mounting the break lever on the engine...but then changed to the master being on the footpeg hanger with the DB6....
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 02, 2014 10:45 pm    Post subject: Reply with quote

polyesterpig wrote:
The stock DB4 yoke offset is 35mm. I am thinking of putting on 30mm offset triples too because I want to put on more modern UPSD forks. I was told there might be an issue of the front tire contacting the engine upon hard braking? I have an extra custom made billet 35mm offset top clamp with an alloy stem that fits the Ducati ohlins forks and lower yoke for the DB4. I bought it from Moto Corse Performance in Florida a couple years ago. I never installed it. If I can find the time to post a picture, I will.


Could well be the problem when fitting 30 mm offset yokes instead of 35mm.
I'm always surprised the front wheel doesn't touch the oil cooler on the horizontal cylinder head under heavy braking.......I know it must be very close indeed.
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Last edited by deebee4 on Wed Dec 03, 2014 7:06 am; edited 1 time in total
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 02, 2014 10:46 pm    Post subject: Reply with quote

2bims wrote:
All depends on what footpegs and hangers you have or intend to use...as evidently they are one and together on DB4's with the master brake mounted on also....cant see ahy it would be a problem as long as you can reach the brake lever from whatever footpegs and hangers you intend to fit

Bimota went back to the Ducati system on the DB5....reverse mounting the break lever on the engine...but then changed to the master being on the footpeg hanger with the DB6....


Yep, anything that works and that you can reach with your right foot will be adequate.... Wink
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hnracing



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

PostPosted: Mon Dec 29, 2014 10:52 pm    Post subject: Reply with quote

Got some more new parts for the build.
Chain adjuster


Chainslider

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hnracing



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

PostPosted: Mon Dec 29, 2014 10:53 pm    Post subject: Reply with quote

Also RH hanger, that I can use to make a copy for the LH side.

Or do anyone happends to have an extra LH for sale?


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Last edited by hnracing on Mon Dec 29, 2014 11:14 pm; edited 1 time in total
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hnracing



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

PostPosted: Mon Dec 29, 2014 10:55 pm    Post subject: Reply with quote

And a complete biposto rear subframe in NOS condition.
Weight complete as picture 3,0kg.
Weight without batterytray, seatlocker and rubbermat 1,7kg

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Last edited by hnracing on Mon Dec 29, 2014 11:25 pm; edited 1 time in total
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hnracing



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

PostPosted: Mon Dec 29, 2014 11:03 pm    Post subject: Reply with quote

Now some questions.
Regarding the chain adjuster on the RH side that has two spacer.
How is it suppose to work with the rearcaliperspacer?
The threaded part that can be seen in the picture will not fit into the chainadjuster.


Regarding the LH side that have a threaded part on one side and no spacer on the other side.
Does that means that there is another spacer on the wheel?
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hnracing



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

PostPosted: Mon Dec 29, 2014 11:11 pm    Post subject: Reply with quote

More questions.
Frame, engine and engine bolts.
Do confirm that it is a 5mm spacer between the engine and the frame on the RH side when you mount the engine bolts.

Swingarm, engine and swingarmaxle
Do confirm the thickness of the spacers that goes between the swingarm and the engine on either side on the swingarmaxle.
I assume that the swingarm should be positioned with the same space on either side of the engine. For me that would give me that either side would have a 5,5 mm spacers
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hnracing



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

PostPosted: Mon Dec 29, 2014 11:12 pm    Post subject: Reply with quote

Now time to change the steering bearings.

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brian



Joined: 22 Aug 2011
Posts: 2620
Location: QLD, Australia

PostPosted: Tue Dec 30, 2014 12:11 am    Post subject: Reply with quote

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
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Current motorcycles - '99 Bimota DB4, '96 Bimota SB6, '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
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 30, 2014 12:15 am    Post subject: Reply with quote

hnracing wrote:
Now some questions.
Regarding the chain adjuster on the RH side that has two spacer.
How is it suppose to work with the rearcaliperspacer?
The threaded part that can be seen in the picture will not fit into the chainadjuster.


Regarding the LH side that have a threaded part on one side and no spacer on the other side.
Does that means that there is another spacer on the wheel?


Looks like the LH chain adjuster is the same as on my db4 but the RH is different. The RH should have a thread on the inside where the spacer, on which the rear brake anchor plate pivots, screws in.
I'll try to make some pictures of my rear wheel setup soon, because I'll take the rear wheel out anyway.

Also the LH footrest hanger is NOT a mirror of the RH footrest hanger. I have a slightly warped LH hanger that I'll photograph as a reference for you.

The round frame covers are only held in place by a tiny allen grub screw. But the can get lost so I wire locked mine from the inside (if they fall out they will not get lost) and also some silicone gasket will help them stick.
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Last edited by deebee4 on Tue Dec 30, 2014 12:41 am; edited 1 time in total
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2bims



Joined: 03 Apr 2010
Posts: 5338

PostPosted: Tue Dec 30, 2014 12:19 am    Post subject: Reply with quote

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
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 30, 2014 12:21 am    Post subject: Reply with quote

hnracing wrote:
More questions.
Frame, engine and engine bolts.
Do confirm that it is a 5mm spacer between the engine and the frame on the RH side when you mount the engine bolts.

Swingarm, engine and swingarmaxle
Do confirm the thickness of the spacers that goes between the swingarm and the engine on either side on the swingarmaxle.
I assume that the swingarm should be positioned with the same space on either side of the engine. For me that would give me that either side would have a 5,5 mm spacers


Nope, the spacers go on the LH side. See spare parts list picture 17 item nr 15. Engine goes exactly in the middle of the swing arm pivot. See spare parts list picture 20 item nr 8. These are identical (listed as 2).

Mind that your chain alignment could well have to be corrected with different front sprocket offset and/or some shimming in the inside or outside of the chain wheel carrier bearings. I had to correct mine with shims on the outside, chain alignment was 1,5 mm off when it left Rimini........
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Last edited by deebee4 on Tue Dec 30, 2014 12:53 am; edited 4 times in total
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Tue Dec 30, 2014 12:31 am    Post subject: Reply with quote

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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