I've been trying to fit the exhaust pipe and silencer, and cannot create a situation where the exhaust pipe isn't touching on the back of the rider's footpeg boss. (I have the original low-profile lower engine mount bolt - but the pipe wedges between that and the footpeg boss.)
Also it seems impossible (with the parts I have) to create a situation where the passenger footpeg can be folded up or down without the bottom part gouging the top of the silencer.
The second problem would be fixed by having a slightly longer joggle plate on the silencer - but this would make the first problem even worse....
Without doubt the pipe and silencer are after-market - but at the moment I appear to need a waisted exhaust pipe with a small 'S' bend in the rear section...
Is what I was expecting to achieve (an exhaust system that only touches at the cylinder head and the two brackets) actually achievable? And with a non-silencer wrecking passenger footpeg?
Just looked at my 2 x C15s.
Certainly both exhaust systems are both replacements , bought during refurbishment of bike a few years back.
Both down pipes run mega close to the riders footrest , this footrest can rotate a bit on its taper a bit , back and forth to give on both my bikes a whisker clearance between pipe and footrest.
Both my silencers have about 1/2 " or so clearance between the top of the silencer and the lowest edge of the footrest folded up or down.
I wonder if you have the correct triangular silencer plate that holds the 2 silencer bolts to the footrest .
On my bikes , this plate is outboard of the rear frame lug through which the pillion rest goes.
40-2760 and 40-2771 for c15 and ss80
Here's some pictures of the problem. Its a 1965 built F model (sidepoints). I was previously confident that the rear footrest was correct for the year/model - but I guess either the rear footrest or the joggle plate is wrong. I certainly don't want the exhaust lower - in fact I need it higher to give clearance at the rider's footrest.
I hadn't realised there were two versions of the joggle plate. The one fitted came with the bike - but that means nothing!
my SS80 has the same footrests as yours I reckon, but my triangular bracket pointsis slightly different to yours - my bracket does not have the dogleg bringing the bottom end outwards - mine is flat downwards from the frame lug and the bit attaching it to the silencer is angled inwards (like yours). could yours be bent ??
could you duplicate a bracket in light metal to try this flat type before re-bending /damaging your own
the ex pipe on mine is the same as yours - I actually pulled a round file around the area on the footrest to give me a whisker clearance
https://draganfly.co.uk/shop/110417/c15-silencer-bracket-stainless-steel/#40-2760
https://draganfly.co.uk/shop/64704/silencer-bracket-stainless-steel/#40-2771
notice the slight variation
40-2760 Silencer bracket 1 C15 65-67
40-2771
Silencer bracket 1 SS80 65-67
Hi,
Just checked what I believe to be original pipe and silencer. Space all round the pipe at the riders footrest, flat plate holding the silencer and, although not original, the passenger footrest looks to be spaced further out at about 1.5". This longer footrest mount and a flat plate for the silencer should give clearance.
Dave.
Yes those pillion rest some in several lengths. I would also try the plate the other way round and behind the frame too in case. Also you can get those triangle plates in several shapes, one moves the silencer back or forward depending on which way around it is.
Thanks for all the suggestions etc. I've had another play. Using the parts I have, but arranged slightly differently, perfect happiness can be achieved at the rear end and at the rider's footpeg. As long as the exhaust pipe isn't in the cylinder head....
I think the bend in the pipe is wrong.
I think I'm going to whistle up a new pipe - to see if there is a difference.
I've worked out - with the aid of Rupert's book - that the brand-new exhaust pipe that came with the project is for a B40.... 1/2" taller...
You have my sympathy, problems like that take an inordinate amount of time to work out because you are starting from the wrong place. I spent hours trying to tune a Monobloc that turned out to have a Concentric needle in it. The only lesson is; when it comes to previous owners, assume nothing!