Custom Exhausts...

[The BeefMeister]

I'd like to find more information on getting a custom exhaust built for a 2 stroke bike but haven't a clue where to find them.
I've browsed through the search section and links section and found nothing of any help.
I tried Zorstec.net and they don't do 2 strokes. Also looked on the osmc.co.uk website and couldn't see anything about 2 strokes. I will email them and ask but I reckon I'll get the same answer that I got from Zorstec.
Does anyone know of anywhere that build custom 2 stroke exhausts?

All help much appreciated.
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"Put your hands up motherstickers, this is a f*ck up!"

[McJamweasel]

Try Stan Stephens - 2 stroke tuner extraordinaire.
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BCF: Be yourself, just don't be an arse.

[Kickstart]

Hi

There are people around who will do them. Think OS Stainless will, but you would probably need to supply them with the critical dimensions.

I might have a number somewhere at home of someone who makes them for karts.

All the best

Keith
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[The BeefMeister]

Thanks for that.
It's not a huge thing I want done just to improve the looks a bit.
Basically all I would like is 2 end cans coming off one expansion chamber but not stacked on top of each other. One either side of the bike, like some 250 GP bikes.
At the moment the bike has a modified Nikon race exhaust which was meant for a NSR125 but managed to get it on my bike, which is a Sachs XTC125.
Do you reckon any welder would be able to modify an old exhaust if I gave him the required bits (2 end cans, pipe etc)?
____________________
"Put your hands up motherstickers, this is a f*ck up!"

[robboadd]

I have a sachs xtc125 aswell if you buy a tzr125 (later model around 95) arrow exhaust it fits straight on!! No modding needed, but youll need to paint it as arrows rust very quickly!
Also it is possible to mod most end cans onto the pipe the end can needs to be 3 bolt fitting and you widen the exhaust fittings to 5mm.

This is a picture to prove the arrow thing, also the bike in the pic has the athena bore kit bigger carb aswell i think. I found the picture on 125ccsportsbikes.com

https://www.vaaler.org/k700i/Ojda(43).jpg

[The BeefMeister]

I thought I saw something on the bike mentioning something about a TZR. I know the engine is the same as a DT but theres no way a DT exhaust would fit as the expansion chamber bends round the front of the frame and not underneath.
I've never found anywhere that sell exhaust's specifically for the XTC so ended up bodging one up.

Still, you reckon it is quite easily done for what I want?
I did a sketch of what I want but its on my PC at home and I'm at work. I'll post it when I'm home.

One more thing, If I was to modify the original expansion chamber and add another end can to it, would it fail it's MOT for it? I'm guessing it's just the end cans that need a stamp on them or is it the whole thing?
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"Put your hands up motherstickers, this is a f*ck up!"

[McJamweasel]

You may well find that you end up with a bike that runs like shit.

2 stroke exhaust shape is vital to how the engine runs, especially the expansion chamber.

You will need it rejetting at least I would of thought.
____________________
BCF: Be yourself, just don't be an arse.

[robboadd]

The engine is a tzr/dt but i think all that the tzr and xtc differs to the dt is the bore and stroke plus the gearing, obviously a dt pipe wouldn't fit due to the difference in shape, as said above if I was you I wouldn't bother trying anything too extreme unless you know what your doing as it will run like shit.

[The BeefMeister]

It's not really the expansion chamber that will be modified, it's just another pipe coming off it with an end can on it.

I've heard that they don't boost the performance at all and I'm not bothered about that. It's mainly for looks but aslong as it's got some go in it.
It hits about 80mph fairly easily with the standard exhaust on and 90mph with the bodged race exhaust. Anything around that speed will be good enough.
____________________
"Put your hands up motherstickers, this is a f*ck up!"

[Kickstart]

Hi

God knows how it runs on an NSR expansion chamber. Basing it on a TZR system would be a massive improvement (as would an original Sachs one I suspect if properly set up, it should certainly manage a lot more than 80 if derestricted).

To get a 2nd silencer you would really have to either have it coming from half way down the expansion chamber (which would seriously screw it up), or split the section coming from the expansion chamber to the existing silencer, and by that stage it would need to virtually double back on itself to come out on the other side of the bike.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[BFG]

[The BeefMeister]

[Kickstart]

[The BeefMeister]

Theres no servo for the powervalve. I've had it looked at by mechanics and they've said it hasn't got one and I can't see one.
It's got the 2 connectors on the top of the powervalve case which have bolts in them.

If there is a restriction in the exhaust then the bodged Nikon exhaust has solved that but as you mentioned, it's strange that it runs ok.

As for the left side peg having no hole to bolt the extra end can to, I was thinking of getting rid of the pegs and getting brackets made. Shouldn't be too much hassle, again just finding someone who can do it.
____________________
"Put your hands up motherstickers, this is a f*ck up!"

[Kickstart]

Hi

Sounds like the servo has been removed. From memory (from a long time ago) when Yamaha omited the servo from the restricted TZR the housing for the power valve did not have the connectors for the cables.

When you turn the ignition on does it make a "zwig zwig" noise? If so then it would suggets the servo is still there but the cables are just missing.

I suspect that the power valve is wedged open if you are getting it round to 90ish.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Sadie]

You could try

Predator Exhausts
84, Tewin Rd
Welwyn Garden City
Hertfordshire AL7 1BD
Tel: 01707 334050

www.predatormotorsport.co.uk



I've used them before and can recommend them.
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With experience comes age.

[The BeefMeister]

There are no noises when the ignition is turned on.

I don't know what position the powervalve is as I can't access it.
My bikes in for repairs at the moment as I had a slight accident and the front fairing was smashed in half. I asked the mechanic If he could try crank it open but I haven't heard If they have or If it's ready for me to pick up.

Last I saw, it had some sexy twin spots to replace the fairing so it'd kinda being streetfightered.
____________________
"Put your hands up motherstickers, this is a f*ck up!"

[The BeefMeister]

Here's that tacky sketch of what I wanted...
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"Put your hands up motherstickers, this is a f*ck up!"

[Kickstart]

Hi

You will need to draw that to scale, and I would be very surprised if the expansion chamber finishes anything like as early as you have drawn it, and also does not finish over to one side.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[The BeefMeister]

I know it's not to scale, it's just a rough drawing of what I'd like. It only took a couple of minutes.

Would it be possible to do? Obviously with the correct measurements given.
____________________
"Put your hands up motherstickers, this is a f*ck up!"

[Kickstart]

Hi

Problem is that with the existing position of the expansion chamber the new section will land up coming off at a very sharp angle.

Check where the expansion chamber ends (on you original Sachs exhaust) and you will probably find it is around about the front of the back wheel, so the new section would need to bend back sharply to go around the wheel.

All the best

Keith

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[The BeefMeister]

It does bend at the front of the back wheel and its to the left hand side (looking from the front of the bike).
Also it being a naked bike now I wouldn't want loads of pipes bending from left, right and centre. I'll have to ask around for an exhaust to be made from scratch I guess, which won't be cheap.
____________________
"Put your hands up motherstickers, this is a f*ck up!"

[Kickstart]

[The BeefMeister]

I remember seeing the process of making a 2 stroke exhaust with all the coned pieces and it doesn't look easy, but someone with experience shouldn't have too much problem.
As you said it's just the measurements that need to be exact.

You say the prices aren't too hideous, roughly what would I be looking at?
____________________
"Put your hands up motherstickers, this is a f*ck up!"

[Kickstart]

Hi

Honestly cannot remember, just that when I last saw the prices I was surprised how cheap they were for the amount of work. Think it was around £200~£300.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing