Searching for a bracket to fit a high mounted exhaust

[Foggy]

Originally Posted by Mr Gazza

You already know know how long the LH screws are, you own 2.

Yes exactly that's the plan, to try the LH side bolts on the RH side when I eventually start the work buf it won't be until after the Summer. In the meantime I was trying to get bolt dimensions to see if it's feasible.

[Foggy]

Originally Posted by Foggy

Yes exactly that's the plan, to try the LH side bolts on the RH side when I eventually start the work buf it won't be until after the Summer. In the meantime I was trying to get bolt dimensions to see if it's feasible.

Quick Update ─ after trawling the internet it seems the LH bolt is 53mm long and the RH bolt is 46mm long. Doesn't quite give me the 10mm difference I was hoping for but it depends how much spare thread there is already. I'll find out when I try it out.

[spuggy]

Originally Posted by Foggy

Quick Update ─ after trawling the internet it seems the LH bolt is 53mm long and the RH bolt is 46mm long. Doesn't quite give me the 10mm difference I was hoping for but it depends how much spare thread there is already.

You won't need longer thread if the shouldered portion is longer - 'coz you won't need the spacer if the shoulder moves it out that far. Also don't see how that helps you with the other 3 fixing points that you're also going to need to space off the frame.

There are sources for domed & countersunk "finishing" washers off-the-shelf - and countersunk stainless bolts available in a surprising (and quite pleasing) selection of lengths. Bar stock spacers & washers readily available or easily adapted with hand tools.

Doesn't seem like any real need for one-off machining. Although I often pine for access to a mid-size lathe or mill....

[Foggy]

Originally Posted by spuggy

There are sources for domed & countersunk "finishing" washers off-the-shelf - and countersunk stainless bolts available in a surprising (and quite pleasing) selection of lengths. Bar stock spacers & washers readily available or easily adapted with hand tools.

Can you recommend any sources Spuggy ?

[spuggy]

Originally Posted by Foggy

Can you recommend any sources Spuggy ?

Over here, I'd probably check McMaster Carr first. But Flea Bay would probably be my go-to otherwise.

So, I'm gonna SWAG that it's an M8 bolt (which requires a 8.2mm bore size for clearance), that the head size should be 25mm, and that the internal diameter of the rubber bush is 15mm or thereabouts. Which seems reasonable.

Countersunk finish washers (may be available in either flat or cone styles):

Stainless:

M3M4M5M6M8M10 Stainless Steel Screws Cup Washers Countersunk Finishing Washer

Countersunk Washers Finishing Washer Fasteners for Screw Parts Washers


Alloy:

ZSPEC M8 Fender-Finish Washers for M8 FHSC Flat-Head Fasteners, Billet, 10-Pack

M4/M5-M8 Aluminium Countersunk Washers DIY Washers For Countersunk Head Screws

Most of the alloy washers seem to be 6061, and may be available in all colors on anodized.

[spuggy]

Originally Posted by Foggy

Can you recommend any sources Spuggy ?

Stainless countersunk M8 bolts:

[https://www.ebay.com/itm/27463891992... SOCKET SCREWS

^^^ UK stockist, length increment by 5mm up to 80mm, and then by 10mm up to 150mm long.

Or these 316 Stainless Steel Hex Socket Bolts Countersunk Flat Head Screws M3-M16

M8 length increment by 5mm up to 70mm, then by 10mm to 100mm maximum length.

[spuggy]

Originally Posted by Foggy

Can you recommend any sources Spuggy ?

Unthreaded Alloy Standoff Spacers for M8 bolts: M4 M5 M6 M8 M10 6082 ALUMINIUM STAND OFF SPACERS COLLAR BUSHES BONNET RAISERS

^^ UK stockist, 1, 2, 5 or 10 pack options, diameters 12/16/20mm, lengths 5-50mm in increments of 5mm.

Stainless standoff spacers for M8 bolts: Stainless Steel Spacer - Standoff Collar Stand Off Spacers | M5 | M6 | M8 | M10

^^ Uk Stockist, 1, 2, 5 or 10 pack options, diameters 12.7/16/20mm, lengths 1/4, 3/8, 1/2, 3/4 & 1" (LOL)...


Obviously, you could stack multiple standoff spacers to achieve the exact length(s) you want. Or someone with access to a lathe could spin you up 8 spacers in pretty short order, I'd think.

At which point I got kind of bored. There's literally 100s of suppliers of standard items like these... Moreover, once you start poking around listings like these, Flea Bay will suggest multiple similar ones too.

[Foggy]

Originally Posted by spuggy

There's literally 100s of suppliers of standard items like these... Moreover, once you start poking around listings like these, Flea Bay will suggest multiple similar ones too.

Thanks for all the info Spuggy, now I know what to search for there's loads as you say. The McMaster site looks great but I'm sure I can find a UK equivalent. My next step is to dismantle what I have and get some precise measurements. Thanks for all your help.

[spuggy]

Originally Posted by Foggy

Thanks for all the info Spuggy, now I know what to search for there's loads as you say. The McMaster site looks great but I'm sure I can find a UK equivalent. My next step is to dismantle what I have and get some precise measurements. Thanks for all your help.

You're welcome. Yeh, test fit it all, and measure. Then measure again

Originally Posted by Mr Gazza

Sorry mate, you can't mess with the length of the shoulder as that is critical in supporting the rubber bush/silent block.
The shoulder length is 19mm, I'll get the diameter a bit later today when I open the workshop, but it will be the same as a standard Ducati shoulder bolt.

Originally Posted by spuggy

Obviously, you could stack multiple standoff spacers to achieve the exact length(s) you want.

It bothered me that my statement here was a little hand-wavey - came back to expand a little.

As Mr Gazza observes, the factory supported the rubber bushing on both sides; there's a washer behind the silentbloc (apart from that one place on the M900 parts diagram that I think is a mistake), and the head of the shouldered bolt contains it at the front, so the bush is all sandwiched in place and constrained.

The back end (between the hanger and whatever it fits to, frame or crankcase/prop stand bracket, whatever) - is just spacer dimension & exposed thread.

What I really like about Mr Gazza's approach, is that the end result looks very tidy - it could have come from the factory. I did wonder - as he mused earlier - if you could utilize a factory part - like the washer the factory used on the oil cooler fixings. Which may be 84110011C, which some describe as "fairing mounting cap" - and might be available in silver or gold (seen both).

This would likely limit the availabilty of M8 bolts though, as that washer wants to be used with a low profile socket cap head, which don't look to be as readily available in longer lengths (over 60mm). That may even be long enough...

Measuring it all up and figuring out what's needed would seem to be key...

[Mr Gazza]

Originally Posted by spuggy

You won't need longer thread if the shouldered portion is longer - 'coz you won't need the spacer if the shoulder moves it out that far. .

Sorry mate, you can't mess with the length of the shoulder as that is critical in supporting the rubber bush/silent block.
The shoulder length is 19mm, I'll get the diameter a bit later today when I open the workshop, but it will be the same as a standard Ducati shoulder bolt.

Great idea to source those bits to make up custom shoulder bolts and spacers.
I had to do the same to replace some shouldered body bolts on the other bike. They were M5 with a 2mm shoulder, so I found some ally spacers the right size from China and they work well with Titanium bolts, except I have to remember to catch the little spacer/shoulder when I take them out.

It might even work out cheaper or not much more to get a local person with a lathe to spin some top hats up from 25mm ally bar.
Dacs knows someone in Norwich and there is Hutch at HTE motorcycles in Beeston. htemotorcycles@yahoo.co.uk. they are all over the place if you look.

Alec at English Electric Motor Company in Redgrave has got a lovely lathe.

[Foggy]

Originally Posted by Mr Gazza

Sorry mate, you can't mess with the length of the shoulder as that is critical in supporting the rubber bush/silent block.
The shoulder length is 19mm, I'll get the diameter a bit later today when I open the workshop, but it will be the same as a standard Ducati shoulder bolt.

Great idea to source those bits to make up custom shoulder bolts and spacers.
I had to do the same to replace some shouldered body bolts on the other bike. They were M5 with a 2mm shoulder, so I found some ally spacers the right size from China and they work well with Titanium bolts, except I have to remember to catch the little spacer/shoulder when I take them out.

It might even work out cheaper or not much more to get a local person with a lathe to spin some top hats up from 25mm ally bar.
Dacs knows someone in Norwich and there is Hutch at HTE motorcycles in Beeston. htemotorcycles@yahoo.co.uk. they are all over the place if you look.

Alec at English Electric Motor Company in Redgrave has got a lovely lathe.

Good point about the shoulder MrGazza I'll make a note of that .... and useful local contacts too. Cheers