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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by George Guille, It's going to be a long 300km... Bolivian Amazon

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Photo by George Guille
It's going to be a long 300km...
Bolivian Amazon



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  #1  
Old 4 Mar 2010
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SS Header pipe
I see Motad do a set of replacement pipes that are fully interchangeable and fit the original equipment. They also have the fittings on the pipe to take the original protector.

Is this one performance enhancing?

Kedo do one that is performance enhancing but not street legal so I guess wont pass an M.O.T here in the UK.
They are also out of stock for 10 weeks.

Are there any other alternatives in SS?
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  #2  
Old 4 Mar 2010
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You wont gain anything with just an oversize header....you need to open up all the way throug... Airbox/filter, rejet carb and open the exhasut or use a aftermarked one.

I've got the one from kedo, and like it. Havent tried to put the original header on, and see it theres a difference. I did the swap cause my headers vere rusty. It I gain any torque/Hp its just a plus.

I havent head it should't be legal, i mean, how can anyone teel that, and why shouldn't it be? Cant see it, dont know if you have speacial laws regarding that.
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  #3  
Old 4 Mar 2010
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A bigger header pipe won't affect the noise level, so it wouldn't fail an MoT. That's why silencers have CE markings and header pipes don't. I have the Motad headers. They were a straight swap for the originals, including the heat shield plate, and fitted straight onto the silencer. They went from bright steel to copper-colour in about 10 minutes of idling (suggesting the s/s isn't very high quality), but I don't mind that. I'm well pleased with them.
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Old 4 Mar 2010
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Yes I understand I would need to open up all the way through.
1 thing at a time.
If I fit the Kedo headers will it still run ok until I adjust the air box and get a new exhaust?

I don't know why it says "not street legal", but it does.
KEDO - BigBore Header Pipe, Stainless Steel 2-1 (3-Piece, Spring Mounted, Polished) Not Street Legal
I see it is back in stock from today too.

Thanks for the info BDZ.
I have to admit I would be pretty disappointed if the Motad lost it's SS shine so quickly as I am in the process of putting lots of shiny bits and pieces on the bike
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Old 4 Mar 2010
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All headers loose their shine because of the heat, some polish and stuff will often do wonders for that.

And yes, you should be able to ride without rejetting when fitting only the headers.
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Old 4 Mar 2010
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hi i have motad on my xt600 03 in year they do discolor but all ss exhaust do due to the heat , no difference in performance just look so much better than standard
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Old 4 Mar 2010
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They are still shiny - just copper-coloured rather than silver. I could polish it off, but I quite like it. The pipes on my Bandit took several thousand miles to reach this stage, whereas the XT's pipes had discoloured before I even rode it properly - just idling it on the sidestand for a few minutes was enough.

I think the colouring looks OK. It suggests the bike is well used, a bit like the blueing of the chrome on an old Brit bike. Nothing wrong with that
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Old 4 Mar 2010
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I think you'll find the big singles tend to run a fair bit hotter than the Bandit.

Its an off-roader, looks better when the shine goes off a bit !!!
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Old 4 Mar 2010
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the motad headers are not just polished stainless steel they are coated with a very strange chrome plate thats why they go that funny colour mine did exactly the same
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Old 4 Mar 2010
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Quote:
Originally Posted by wolfzero View Post
the motad headers are not just polished stainless steel they are coated with a very strange chrome plate thats why they go that funny colour mine did exactly the same
Aha! That explains it. When I got them I thought the s/s looked a bit funny and not like I expected. It looked a bit 'cheap' compared with OE stainless systems. Now you mention it, it did look to be plated with something.

Oh well, with all the trouble I had taking the old ones off, I'm sure as hell not going to change them now
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Old 5 Mar 2010
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Good to hear all your replies.

Kedo says the german vehicle regulation it does not comply with is
StVZO, §§19, 30, 49 //97/24 EWG. Now everything is clear

I am going to get my bike tested on Dyno as it is standard and then again after I have a Kedo header pipe, modified air box, air filter, rejetted, muffler.

Which air filter should I get, K&N?
Which road legal muffler? Stainless Steel hopefully.
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Old 5 Mar 2010
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I've used a pipercross (piperx) foamfilter, i know nothing about its ability to flow and stuff like that, just wanted a foamfilter since i ride a lot offroad.

Are you gonna rejet it yourself?

When you rejet for the opened up system, go for a #48 idle jet (stock is 46 and 48 is the next step) raise both needles one notch, and stop there. That should be really close.

Try to use same chainkit/gearing, same tires and stuff, so you dont have to many different things that can effect performance.

Please share the results with us.
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Old 7 Mar 2010
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There is a company advertising that tests the bike on the dyno and then offers to rejet.

But as I am doing this over a period of time as finances allow after the dyno I will get the kedo header pipe. Next air filter, tail pipe. All of which I will install myself.

I have never looked inside a carb and it scares me a bit to think I could really mess things up.
So if I feel it is beyond me I will as the garage to install the jets before testing on the dyno again.

Thanks for the info regarding the jet sizes.
I see the Pilot jet is 43F 14343 23 #46 so will go for #48

So I should leave the main jets as they are?
By raise the needles one notch do you mean adjust the existing needle sets, #'s 47 and 48 in the parts catalogue. 4PT 149OJ 10 & 4PT149OJ 00

I will be happy to share the before and after results.
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Old 7 Mar 2010
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Yes, raise the stock needles in both carbs (lover the clip)

If you get someone else to rejet your carb, make sure you know which jets they have used.
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Old 7 Mar 2010
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Quote:
Originally Posted by Jens Eskildsen View Post
Yes, raise the stock needles in both carbs (lover the clip)
I think he means lower the clip

Lovers are something else!
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