Cafe racer exhaust

[ital916]

Hey guys

Work starts soon on turning my srv250 into a cafe racer. Just a question about exhaust mufflers. I was looking at the mufflers available on the market today and they are quite large, so anybody happen to know of any small, classic style mufflers that will give a very nice sound, whilst maintaining that classic bike style? Straight pipes I hear are complicated and need to be calculated correctly or will harm performance. How will the change in back pressure affect performance? The srv's run the same engine as the yammy virago 250, and I know for a fact they can sound very very nice if done properly. Are dump/shotgun pipes legal, as they sound awesome and look quite nice with their straight from the engine short look. Sorry for the noob questions, I've never customised a bike before.

Drider

[Ixion]

Dunstall short megas. Can't be anything else.

[ital916]

guessing that the brand and model name? Lol I will go research them now. Does the bike need to be retuned once the new muffler is installed?

[ital916]

Is there a company webpage I can't seem to find one?

[AllanB]

first one is a Supertrapp - removable disks so you can tune it and the sound, alloy with a weld-on tab.
from www.denniskirk.com US$180 plus shipping (very good to deal with).

Second also Supertrapp - pretty www.cyclestuffusa.com (never used them).

Third is a long 700 mm Dunstall replica - available in NZ and on trademe too - shop around for these - about $110 each is the max you should pay in NZ. Also available in a short form - 400 mm I think.
I ran the long ones on my old 750 twin - loud - I ended up making a db killer insert.
The short ones are very very loud. The good thing is that you can piss about with the internals as they are removable. These are Asian knock-offs, clean looking but fairly light weight materials (the original packing is I think a collection of old men's belly-button fluff - and blew away in 500kms).
Make sure you get the ones with the removable core if you want to be able to messy around - there is a set that are fully welded that are similar.

[pete376403]

Paul Dunstall was an english custom bike builder of the 60s and 70s. His design for mufflers "Dunstall decibels" was a classic, slow taper megaphone witha short reverse cone.
http://cgi.ebay.com/ebaymotors/Replica-Dunstall-Decibel-Mufflers_W0QQcmdZViewItemQQ_trksidZp1742Q2em153Q2e l1262QQcategoryZ35619QQihZ016QQitemZ260226582110#e bayphotohosting
Initially Dunstall made parts for the British bikes, but later made Honda accessories as well.
A classic cafe racer look for your yamaha would be to try and make it look like an egli Vincent
http://www.godet-motorcycles.com/egli/egli.htm (this will be my Powerball winner bike)

[avgas]

For me supertrapps are fantastic and my fav's.
I like Dunstalls on say a Norton but to me they look rude on everything else.
Talk to custom chambers - as i have never seen a bad piece of work ride out of that shop.

[xwhatsit]

You can get the short reverse-cone Dunstall replicas (waffle-baffles in the exit) for about $100 on Tardme, or about the same if you order them through bike shops. EMGO produce them. Keep the stock headers, put a couple of shorty megas on the back. Debaffle them first, the EMGO ones are quite easy, you just have to break off one or two tack-welds at the entry end, then the baffles should slide out easily.

SRV250s have marvellous looking headers, especially the right-hand side. A pity it's not a 2-into-1, the bikes are slightly porky (already 144kg dry) for ~26hp, so there's already a few kg you could save by doing that.

[Ixion]

Well, it could very easily be made 2 into 1. The virago (can't swear the SRV is the same), the apparent rear header is a fake. The real header is unchromed and runs behind the engine right down to about the real header form the front cylinder

[Jacko2]

Dushy, your bike is 2 into 1 already and already has and after market exhaust

[xwhatsit]

Dushy, your bike is 2 into 1 already and already has and after market exhaust

Photos!

Well just pull off the end-can and chuck on one shorty mega.

[Jacko2]

Photos!

Well just pull off the end-can and chuck on one shorty mega.

Go to Dushys unveiling, hehe

[ital916]

Thanks jacko, yeah i'm not changing the whole system just the muffler/silencer *haha yeah right, my one won't silence anything* and repainting the heat shield but will re silverise the headers or matt black them. Just thinking bout the paintjob, i'm basically gonna go for a satin black with some other details in red, will be very very awesome. A few custom mods shall be ordered in from ebay. What diameter are the bars on the srv? Hey ixion, my one is the renaissance version of the srv. There were two versions that were produced. Just fairings were very nice people, they quoted 500 for a rear cowl to cover the pillion seat like a proper cafe to be made. Thats way too expensive but the srv already looks very cafe so that is alright by me, i'll leave her stock. Can't wait to start tinkering. First thing though we need to get her running like a beaut.

[Devil]

My vote goes to custom chambers.

Saw/heard a Bonneville T100 with CC pipes on it the other day. It sounded and looked perfect. Not too loud either.

[FilthyLuka]

Hey mate, Satin Black? You making a rat or a cafe racer? In my oppinion, a cross between the two would be cool. Rat Cafe racer... Or would that be west auckland pub racer, who knows

yours bars will be 7/8" in diameter. However, measure your fork legs than get appropriate clip ons from either www.bikestore.co.nz (woodcraft) or from motomail (tomaselli), they are both around the same price ($250+/-)

Also, if you put a free-flow pipe on it wouldn't hurt to jet the carbs. I can give you the number of a dude out west who is great with carbs and not to expensive either, once you have done all the intake/exhaust mods, send it to him and he can balance/tune your carbs. PM me if you wan't his number (the guy is out west BTW)

[ital916]

Hey mate, Satin Black? You making a rat or a cafe racer? In my oppinion, a cross between the two would be cool. Rat Cafe racer... Or would that be west auckland pub racer, who knows

yours bars will be 7/8" in diameter. However, measure your fork legs than get appropriate clip ons from either www.bikestore.co.nz (woodcraft) or from motomail (tomaselli), they are both around the same price ($250+/-)

Also, if you put a free-flow pipe on it wouldn't hurt to jet the carbs. I can give you the number of a dude out west who is great with carbs and not to expensive either, once you have done all the intake/exhaust mods, send it to him and he can balance/tune your carbs. PM me if you wan't his number (the guy is out west BTW)

Haha yeah it's a cafe/rat racer mix, will look gooood. The diameter was needed to know what bar ends and bar end mirror attachments to get. Are clipons difficult to install. I hear that flat bars are a little more forgiving to ride with everyday and won't affect the steering lock as badly *come in hand y for slow speed maneuvering*. Are straight through short pipes an option?

[FilthyLuka]

Haha yeah it's a cafe/rat racer mix, will look gooood. The diameter was needed to know what bar ends and bar end mirror attachments to get. Are clipons difficult to install. I hear that flat bars are a little more forgiving to ride with everyday and won't affect the steering lock as badly *come in hand y for slow speed maneuvering*. Are straight through short pipes an option?

Clip ons arent difficult to install, 'specially the woodcraft ones, just bolt em on. As far as internal bar diameter, i have no clue, it should be the same for all 7/8" bars i would assume.

Straight through short pipes are an option, but probably not a very smart one

[xwhatsit]

Haha yeah it's a cafe/rat racer mix, will look gooood. The diameter was needed to know what bar ends and bar end mirror attachments to get. Are clipons difficult to install. I hear that flat bars are a little more forgiving to ride with everyday and won't affect the steering lock as badly *come in hand y for slow speed maneuvering*. Are straight through short pipes an option?

Clipons are not optional with a cafe racer :Pokey:

I don't think you want to go with straight-through pipes. It will sound cool for all of 30 seconds, then you'll just want the thing to shut up (and so will your neighbours and the nice policeman). Go with a megaphone, or pea shooter style or something. Not the cruiser style straight-through slash-cut kind of thing.

[Ixion]

Cafe racer MUST (almost by definition) have either clipons, or Velo bars. And a mega exhaust. (unless you are going for a REALLY retro look, in which case a fish tail would be OK).

The rear seat hump is optional, even cafe racers need somewhere for the chick to perch.

[xwhatsit]

Velo bars

Are those the same as clubman bars?

Bahahaha. I saw a Japanese CB250RS cafe racer with a fishtail exhaust. Even had that strange Velocette square tank/seat thing going on. Thoroughly strange.

[ital916]

Yeah i've been sitting and looking at the beaut in my garage *I now own her* lol, definately want a short mega, just looking for clip on prices at the moment.

[FilthyLuka]

$272 for woodcraft clip ons.

http://www.bikestore.co.nz/products.asp?category=63&item=412

Easy to install, fucken great if you bin. You just slot in a replacement bar, you don't need to replace the entire assembly

[xwhatsit]

$272 for woodcraft clip ons.

http://www.bikestore.co.nz/products.asp?category=63&item=412

Easy to install, fucken great if you bin. You just slot in a replacement bar, you don't need to replace the entire assembly

Nah they're too modern and fancy and shit.

D, I got mine off eBay. Less than $100 easily. Old-style, just a chrome tube (slanting down like clip-ons should be, not flat like sprotsbike ones) with a simple clamp on the other end. Measure your fork-tube accurately (needs to be millimetre accurate) and I'll see if I can track that guy down.

[ital916]

Turns out the srv comes with 2 into 1 with a short megaphone exhaust. Prob is that the muffler is dented and is a one piece so de baffling will be tricky. Will CC fix the muffler and pull it apart to debaffle or do they only construct exhaust systems. Any other tradespeople who can pull apart the one piece muffler and do it up. This will save a couple hundred on getting a new muffler as there is a nice on already on it lol

[FilthyLuka]

Turns out the srv comes with 2 into 1 with a short megaphone exhaust. Prob is that the muffler is dented and is a one piece so de baffling will be tricky. Will CC fix the muffler and pull it apart to debaffle or do they only construct exhaust systems. Any other tradespeople who can pull apart the one piece muffler and do it up. This will save a couple hundred on getting a new muffler as there is a nice on already on it lol

Take a hacksaw to it, slip on an aftermarket emgo shot mega

Done

[Bonez]

Go with FilthyLukas idea. Do a search on KB for the Emgo cataloque and download that to see what mufflers it has. Dunsall replicas, shorties etc will set you back around $150 each. Any bike shop should be able to get them in in a day or two. You may have to get an adapter made up using the end of your existing muffler that mounts onto your headers.

Nah here's the link- http://www.emgo.com/emgo_catalogs.html

You can use "ace" style handle bars which fit on your existing risers. Similar to- http://www.bellacorse.com/bcc039.htm

Ventura do 7/8" items. Bought a pair for the 550f for $50.

[Taz]

Custom Chambers will make you anything you want.

[ital916]

Go with FilthyLukas idea. Do a search on KB for the Emgo cataloque and download that to see what mufflers it has. Dunsall replicas, shorties etc will set you back around $150 each. Any bike shop should be able to get them in in a day or two. You may have to get an adapter made up using the end of your existing muffler that mounts onto your headers.

Nah here's the link- http://www.emgo.com/emgo_catalogs.html

You can use "ace" style handle bars which fit on your existing risers. Similar to- http://www.bellacorse.com/bcc039.htm

Ventura do 7/8" items. Bought a pair for the 550f for $50.

Those norman hyde bars look sweet as. So they will be compatible on the srv?

[Badcat]

Custom Chambers will make you anything you want.

yep - they made this pipe on my sr500 street tracker project..

http://www.kiwibiker.co.nz/forums/showpost.php?p=530833&postcount=125

ken

[Bonez]

Those norman hyde bars look sweet as. So they will be compatible on the srv?The Norman Hyde ones are 1", so no. The Ventura "ace type" ones are 7/8", so are compatable.

[FilthyLuka]

The Norman Hyde ones are 1", so no. The Ventura "ace type" ones are 7/8", so are compatable.

There is nothing stopping you from installing 1" risers if you can't find the bars you like in 7/8"

Got a hacksaw?

[FilthyLuka]

Your are after Emgo:

80-84030
Universal Reverse Cone Shorty Megaphone,
17” long, Complete with Inlet Clamp, Sliding
Mounting Bracket and Reducers.
Fits: 1-3/4”& 1-3/8”

[Ixion]

Your present exhaust is fine and appropriate to the cafe racer motif.

Get the bike running on both cylinders before you worry about bling.

[Bonez]

There is nothing stopping you from installing 1" risers if you can't find the bars you like in 7/8"

Got a hacksaw?I'd just have the existing risers clamps enlarged if I wanted the Hyde items.

[ital916]

Your present exhaust is fine and appropriate to the cafe racer motif.

Get the bike running on both cylinders before you worry about bling.

Agreed

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