Exhaust questions :)

[Ricky]

Sorry if this is in the wrong section mods, do as you wish if it's in the wrong place

So basically I was wondering if it was possible to make a straight exhaust that comes out of the rear of the bike near the number plate holder, like the aprilia rs50?

http://imageshack.com/a/img513/7004/zuv8.jpg

Would it affect performance?

Would making a new link pipe be expensive?

I only want it for cosmetic reasons, nothing else but if it will decrease speed or wear out my engine somehow I can live with my scorpion exhaust

Thanks for reading and looking forward to the replies

[Mr Fro]

If you're handy with a welder and a pipe bender then you're all set!

My ZX6r has one like that and there is a good bit of insulation under the seat. You might have to mod the rear frame a bit too.

[Ricky]

If you're handy with a welder and a pipe bender then you're all set!

My ZX6r has one like that and there is a good bit of insulation under the seat. You might have to mod the rear frame a bit too.

 

Hmmmm, I have absolutely no experience with either of them tools, anyone fancy offering? :lol:

I think they look awesome, but people have told me stories about losing pressure or something along those lines?

I just think my YZF would look awesome with it's exhaust out the back and it'll be out the way through corners

[9bhp]

Are you looking to change your headers too?

If you was, that could change your power for better or for worse.

If you had the same headers, essentially, you are just changing the pipe for the gases to escape and creating different noise.

[Ricky]

Are you looking to change your headers too?

If you was, that could change your power for better or for worse.

If you had the same headers, essentially, you are just changing the pipe for the gases to escape and creating different noise.

 

Sorry to sound a bit thick but what are headers?

[9bhp]

No, its cools

Headers are where your exhaust, meets with your engine. Some people call them down pipes.

The header will be attahed to your engine... follow it down to a link and that will be your exhaust.

Found a great little link what might be of interest.

Your mate was on the right track!

http://auto.howstuffworks.com/question172.htm

[9bhp]

If I am right, your bike should only have the one header (one pipe attached to the engine) which is only quite small?

If this is the case, find yourself a fabricator in your area to see if he will bend and weld it for you off the books.

You`ll probably need to adapt your tail section to accommodate such mod.

[Ricky]

I'll probably be keeping the the header that was originally with the scorpion exhaust and make new pipes from there into the rear of the bike, seems like the 'easiest' way

Would a loss of back pressure be harmful to the engine?

I only ask because a mate of mine at work has drilled his exhausts to make it louder and nearly every other motorcyclist there moans about back pressure and other things

[Ricky]

If I am right, your bike should only have the one header (one pipe attached to the engine) which is only quite small?

If this is the case, find yourself a fabricator in your area to see if he will bend and weld it for you off the books.

You`ll probably need to adapt your tail section to accommodate such mod.

 

Yeah, only one pipe attached to the bike

I'm going to have a search around and ask about prices etc and find a suitable end can

Thanks for the help dude

[eastanglianbiker]

being a 2 stroke ricky back pressure is very important to the engine staying in working condition and trying to build under seat exhaust would be hard work including getting the expansion part right and then getting it to flow correctly i personally would say it would need a specialist in that line of work to build it and convert it to fit ur bike and to set it up running correctly as well

[Ricky]

being a 2 stroke ricky back pressure is very important to the engine staying in working condition and trying to build under seat exhaust would be hard work including getting the expansion part right and then getting it to flow correctly i personally would say it would need a specialist in that line of work to build it and convert it to fit ur bike and to set it up running correctly as well

 

Hi EAB

My bike is a four stroke, would it still need the same sort of expertise building it or could a dipshit like me do it?

Sorry for the confusion I couldn't think of any other bikes than the aprilia rs50 that had that exhaust

[9bhp]

Being a 4 stroke it should make things a lot easier.

Any good fabricator could advise you.

Or even find your nearest chop shop, they normally have some decent people around to advise you.

Give these a call. not far from you in Blackpool

http://www.customautofabrications.co.uk ... ts/1289425

Just found them on the net, never used them before

Edited April 10, 2014 by 9bhp

[Stu]

I consider myself an OK welder but I recently had a go at some stainless welding and its not something I would want to put on show

plus when welding stainless you are supposed to purge the inside of the pipes with gas too to get a neat weld on both sides

if it was me I would be looking at getting someone to weld it for me only because my bro is a pro at this sort of thing

[MR_W]

In theory an exhaust there balances the bike better as you centralise the exhaust weight rather have it hanging off the side.

Having said that, there's a hell of a lot of race/road bikes with the exhaust on the side still and a fair few motogp teams run an exhaust under the tail and the right side (Honda RC213V being a great example).

Panigales have the exhaust exits at the bottom of the engine casing right in front of the rear wheel. Supposedly to lower centre of gravity and centralise the weight. Whether it makes a massive difference to performance, I'm skeptical despite being a Duc fan, but can see the aesthetics of it.

[Ricky]

Being a 4 stroke it should make things a lot easier.

Any good fabricator could advise you.

Or even find your nearest chop shop, they normally have some decent people around to advise you.

Give these a call. not far from you in Blackpool

http://www.customautofabrications.co.uk ... ts/1289425

Just found them on the net, never used them before

 

I may give them a ring tomorrow! They seem okay and depending on how they talk to me on the phone is wether they get my business, for some reason when people I talk to over the phone realise I'm only young they seem to feel the need to treat me like a twat and most of them end up being f**ked off

 

I consider myself an OK welder but I recently had a go at some stainless welding and its not something I would want to put on show

plus when welding stainless you are supposed to purge the inside of the pipes with gas too to get a neat weld on both sides

if it was me I would be looking at getting someone to weld it for me only because my bro is a pro at this sort of thing

 

If you feel up for the challenge stu, go right ahead, or better yet I'll bring my bike to your brothers

Got any pictures of the stunning bit of work stu?

 

In theory an exhaust there balances the bike better as you centralise the exhaust weight rather have it hanging off the side.

Having said that, there's a hell of a lot of race/road bikes with the exhaust on the side still and a fair few motogp teams run an exhaust under the tail and the right side (Honda RC213V being a great example).

Panigales have the exhaust exits at the bottom of the engine casing right in front of the rear wheel. Supposedly to lower centre of gravity and centralise the weight. Whether it makes a massive difference to performance, I'm skeptical despite being a Duc fan, but can see the aesthetics of it.

 

The only reason for changing it is for the aesthetics my bike is only a 125 so I can't really compare it to the likes of ducatis and other race bikes

But I can see what you mean:)

Thanks for the replies guys! As always they're greatly appreciated!

[MR_W]

Tbh, being only a 125cc it may be that as long as you don't lose engine power that cleaning up the airflow around the bike makes a difference to mpg or the bikes handling.

Never tried it myself, but logics states it should have an impact. How big and good or bad depends on the quality of the work

[Ricky]

Tbh, being only a 125cc it may be that as long as you don't lose engine power that cleaning up the airflow around the bike makes a difference to mpg or the bikes handling.

Never tried it myself, but logics states it should have an impact. How big and good or bad depends on the quality of the work

 

Only thing that is worrying me about doing it so far is that I've never seen anyone else do it with their YZF, which makes me think that there's a reason why people have never done it?

There's someone who's put a r6 exhaust on a YZF but not this

[9bhp]

As long as you take it to a decent place, they should be able to best advise you on what will work best.

Essentially, this should be a real piss easy job for a fabricator and it should work.

Basically, its the same set up as you have now but the pipe just bent in a different shape.. so cant really be too hard.

Thought you said its never been done before? haha

http://i1343.photobucket.com/albums/o797/chris1981turner1/100_4095_zps1f1d664d.jpg

Read through his blog and he has a step by step guide

http://www.yamahar125.com/threads/kev-s ... -blog.126/

If that was me, i`d have painted rather then wrapped.. that wrap stuff get everywhere and you`ll be itching for weeks.

It will look sweet if its done right but if its done bad, it will look crap.

[Joeman]

Don't like the look of that!

No space between that rear hugger and the underside of the exhaust can. If he hits a bump, his hugger with snap off!

[Stu]

Ricky

leave it as it is

that one above looks well shit

[Ricky]

That does look pretty dreadful

I've read his tutorial and he made it all himself with some piping that looks shit, I'll probably end up getting a proper welded one made

I just want a cylinder shaped end, his looks like a stock can just ran over a couple times in the car

[Ricky]

I rung him up and he wants pictures of the bike and how I want it, I've sent him what he needs and he'll message me back with a quote

Cheers for your help guys

I'll keep you all Informed

[eastanglianbiker]

thought you was doing it to the tzr hence saying about being 2 stroke but even going onto your yzf you will need to sort out soute for the pipe to take and possibly move/modify wiring loom to get it safe out of the way and make sure it has decent heat shields on it to stop it melting the under side of the seat and all the rear under guard,lots to consider and in my mind cost would by far outweigh any gain in power/speed/resale value

[Ricky]

thought you was doing it to the tzr hence saying about being 2 stroke but even going onto your yzf you will need to sort out soute for the pipe to take and possibly move/modify wiring loom to get it safe out of the way and make sure it has decent heat shields on it to stop it melting the under side of the seat and all the rear under guard,lots to consider and in my mind cost would by far outweigh any gain in power/speed/resale value

 

I have some unexpected debt and my insurance is due next month, and with my insurance history for the first year, it isn't cheap!! So the TZR may have to go! I can't afford to finish it and I need 300 quid in 6 days to pay off a hire bike bill

I'll be keeping the scorpion exhaust and I have a bunch of plastics and spare pieces of YZF I can swap straight back onto it when I come to sell it, I have at least another year with my YZF and want to make it as bad ass as I can in that time

I don't particularly want it for speed only looks, oh and to keep my tooshie warm in winter

He said he can do the job, no problem but wants to see the bike before he starts giving me quotes

[Joeman]

dude, finish the TZR, it will sell for loads more when its complete, then spend the money on your other bike...

but do you really need an underseat exhaust??

raises the center of gravity - not good for cornering