Guys, Does anyone know if i can fit a exhaust from a 8V K100 to a 16V K100?
are the headers the same?
I appreciate the mountings for the silencer/muffler won't be the same.
Main reason is to lose the cat and possibly change the muffler to a more modern style? NOT louder!

It should be physically possible, but I don't know how it will affect the performance of the engine.
Is the 8V muffler creating the same back pressure as the 16V?
I don't have any answer.

It's the headers I'm unsure of. The spaceing, diameter and mounting method.
My exhaust is a later design, but does that mean better design, the large bulge for the cat makes me think its clean but not neccessarily as efficient?
Its a 'project' bike, a toy, so i only want to buy another exhaust and 'mess' with it! But good to know the header will at least fit!

Isn't there an Oxygen sensor on the 16valve exhaust which presumably feeds a signal to the Motronic engine control unit... (8-valve bikes had Jetronic, different animal) Perhaps physical fit isn't the only issue to consider?

How about the alternative? Putting a 16v exhaust on an 8v engine?

Get a Motad from the UK, cheap enough (Motorworks UK has the best price I've found) yet NOT loud, but more 'burbly' than stock, and looks good with its round canister, reminiscent of the 16V style of exhaust. As for the 02 sensor hole if attempting to mount a 16V exhaust canister, just screw an appropriately threaded bung into the hole. An oil drain plug from an Oilhead works a charm. There should be one cheap enough on eBay or somesuch. The cylinder head to header gaskets are the same part number for both 8V & 16V bikes so the headers should/could be the same size. It's a one-piece exhaust affair too. Have you picked one (16V) up lately? Bloody heavy piece of metal. In fact, except for the actual mount which attaches to the left hand side foot peg bracket the mufflers from both bikes use the same mounting hole size spacing so either mount, as needed, will work to fit enable a clean swap between muffler types. There really are precious few 'modern' exhaust systems made for the old bricks any more.


The business end of the Motad as fitted to my 11/86 K100RS 8V. The only 'issue' I can say I've had with it is that they didn't leave anywhere near enough room on the inside where the centre stand comes up to meet the muffler and it has to be clearanced a smidge to fit and fully retract, a minor nuisance.

Well not exactly true - some of us are determined to get up to date equipment for our Kays - even if that means getting out there and developing products ourselves!

Having been through the shock absorber development [ RAM ] and then Power Plug Leads - I've moved on to exhausts. To be truthful, this has been ongoing for 12 months now - partially because of suitable road testing under all conditions and also because I am retired and things have to progress more slowly! This has become a bit of a mission - ie to get quality components at a REASONABLE price.

Coincidentally I am off to Keihan's tomorrow to finalise and sign off the pre-production units so they can be put into production. They will be marketed through Realm Engineering [ RAM branded ].

Here's a pic of an early prototype - it hasn't been linished and polished as the production units.

The idea I had behind this style is that if and when the silencer requires replacement, you don't have to buy the whole unit AND you can fit the can of your choice.

I got Keihan to jig up the downpipes, so that the system can be used on K1100's as well.

Precious.

At least you didn't say precocious.

BTW - the issue of the stand / exhaust interference - I noticed that on a couple of the bikes we tested that the side stand pivot was slightly worn allowing the stand to contact the exhaust. We overcame this by adding a hard rubber buffer mounted on a bracket with the system. Real cure is obviously to repair the stand !!!

Here's a pic of the prototype Race Rep system [ underseat ] - no stand interference problems here !

Hi beachcomber. Something else to go on my wish list for this winter. Looking at the system that you intend to produce, am I right in thinking that its more of an 'extractor' exhaust rather than the original 'collector' type? Do you expect any power gain and will panniers and stands fit with it?
Important bit. Any idea of price?

Hi John,
haven't had the system on a dyno - but certainly everyone who has used it agrees there is more mid-range grunt.

Without going to a lot of trouble [ and expense ] - not to mention the space it would take up - a true extractor is not practicable. We have tried to improve the design a little over OEM.

As with most of my little missions, the brief was to get a high quality item at a reasonable cost. In this instance I also looked at the practicality of splitting the collector from the silencer, so that parts could be changed individually. That also means that when the can eventually needs changing, you have a very wide [ and thus cost effective ] choice. For instance - although the can shown is a one of Keihan's off the shelf jobbies - I have a rather nice Scorpion Carbon can which I bought [s/h] for £25 !! The unit would have been much cheaper had we gone for a one piece silencer with 4 connector tubes.

Cost? Hopefully that will be finalised at the meeting today - HOWEVER we are talking Keihan quality Stainless Steel [ industry leaders with their Airhead stuff ] and they won't compromise on their normal quality. I do expect it to be more expensive than the Motad unit, but much cheaper than Remus and ...................

One of the things that added to the development time was that I had no panniers etc. on my bike, so we had to wait for a suitable donkey [ sorry Andy ! ] to fit and trial.

We made certain that everything fitted and cleared on a standard bike with panniers - that's when we discovered the wear / interference problem on the sidestand.

I'll post up some pix after the weekend of the polished production item - as Ernie Wise used to say - "you can't see the join" [ welds anyway!]

Hi all, I've asked about this previously,............... if anyone knows the whereabouts of a dual system for a K100, I'd like to know. I'm really interested in fitting up something totally different and Bert posted a pic previously of a red K with a dual pipe sytem, looked pretty swish I reckon.
Cheeers, Dennis

If it's just for the look, you can always install a fake exhaust on the right side.
This could be a good place to store the tent poles when going camping!

Have a look here:

http://f3.webmart.de/f.cfm?id=2385371&r=threadview&t=2739836&pg=1

That'd probably flow like hundred year old plumbing...

Nico Bakker Exhaust

Nikko Bakker should know better ..........................

Alex_GER wrote:Have a look here:

http://f3.webmart.de/f.cfm?id=2385371&r=threadview&t=2739836&pg=1

"The K-10016V/K-1100 exhuast will bolt right on to an old K-100. I've seen several done this way. Supposedly they flow the bestand there is no heat shield to buzz. You will need the K-10016V center stand bracket which has a mounting point for that exhaust, or I imagine you could drill and tap the original center stand bracket. This exhaust will also open enough room to permit the fittment of a K-1100RS rear wheel and a 160/60R18 rear tire on the early monolever rear swingarm. I saw just such a bike today for sale at the PartsHaus in Long Beach CA and the tire and wheel just fit. Nothing rubs. Very nice. "

Good info, as I bought a 16v Remus on eBay and intend to try fitting it to my 85. Wish me luck! I had no idea this would allow a larger rear tire...

Knowing this thread was created 2+ years ago, I'll dare to ask, has this design of yours seen the light of day, and if so, where can I get one?

beachcomber wrote:At least you didn't say precocious.

BTW - the issue of the stand / exhaust interference - I noticed that on a couple of the bikes we tested that the side stand pivot was slightly worn allowing the stand to contact the exhaust. We overcame this by adding a hard rubber buffer mounted on a bracket with the system. Real cure is obviously to repair the stand !!!

Here's a pic of the prototype Race Rep system [ underseat ] - no stand interference problems here !