Bucket exhausts

[nathanwhite]

hello ev'rybody

I'm building myself up a bucket from a disused road bike I bought for the price of the change of ownership fees.
(The thread is over in General Maintainence if ya wanna have a look)
I just have a couple of quick questions regarding aftermarket exhausts for buckets.

1, Bearing in mind I have never swapped a muffler, or cut up header/mid pipes, what considerations will I need to make if I were to do this?

2, What kinds of exhausts are there for buckets and where does one find them?

3, Is something like this what I would be going for? and if so, how do I connect it to the midpipe (or header, depending on where I put it.)


I don't have much of clue in this area yet, so any advice would be appreciated.

[mossy1200]

http://www.kiwibiker.co.nz/forums/sh...N-125-overhaul

Take it its the en125

500mm to 600mm header pipe with large area(volume) straight through muffler. Dont do what I did and buy a volume enhancer.
Depends on budget but maybe a stock r1 muffler from tard me(one of the pair).

This is mine with its current illegal mega phone noise maker that was a wasted amount of monies.

[nathanwhite]

http://www.kiwibiker.co.nz/forums/sh...N-125-overhaul

Take it its the en125

Yes indeed.

500mm to 600mm header pipe with large area(volume) straight through muffler. Dont do what I did and buy a volume enhancer.
Depends on budget but maybe a stock r1 muffler from tard me(one of the pair).

This is mine with its current illegal mega phone noise maker that was a wasted amount of monies.

Something like these? 1 & 2 Hmm, little bit more then I wanted to spend, but doable. The problem is I would end up with two of them because I doubt any R1 owner wanting to get rid of his stock pipes would sell only one.

So what exactly is a straight through muffler and how does it differ from said volume enhancers?
I'm guessing it means, the exhaust gases literally go straight through the pipe as opposed to being partially or totally blocked by something?

[F5 Dave]

If yo have a read up we are all having issues with noise at tracks. 4 strokes in particular are loud & the sound carries. With the proper muffler you can get good power with no power loss. The 'straight through must be best' approach is a doomed entity & is a myth anyways.

[koba]

I'm guessing it means, the exhaust gases literally go straight through the pipe as opposed to being partially or totally blocked by something?

Correct.
There are all sorts of internal configurations. Troll google images after typing in 'exhaust cross section'. or something like that.

Buy the best tyres you can get for the rim sizes, TT900 or BT39ss are possible candidates. You could also change the rims to suit more common tyres.
I'm serious about this, the EN I had for a bit was shod with tyres less than half as grippy as the 30year old standard tyres on 'the' old A100.

[nathanwhite]

500mm to 600mm header pipe with large area(volume) straight through muffler. Dont do what I did and buy a volume enhancer.
Depends on budget but maybe a stock r1 muffler

With the proper muffler you can get good power with no power loss. The 'straight through must be best' approach is a doomed entity & is a myth anyways.

As far as I'm aware, most if not all stock mufflers are not straight through so they can meet emmission and noise regulations. The main advantages offered by aftermarket systems is some increased power by a freer flowing exhaust, but mainly they weigh a lot less, thus increasing the power/weight ratio.

If this is correct, then what advantage would a stock R1 muffler offer over a generic cheapie excepting the noise?

Correct.
Buy the best tyres you can get for the rim sizes, TT900 or BT39ss are possible candidates. You could also change the rims to suit more common tyres.
I'm serious about this, the EN I had for a bit was shod with tyres less than half as grippy as the 30year old standard tyres on 'the' old A100.

Tires are a high priority, but I've had no idea what's avaliable. Thanks, I've got something to start researching with now.

[F5 Dave]

Heck I have no idea about the R1 pipes, but they are made for 1/2 a 1000. Should be able to get a 125 2 valve gasflow through there. Could be fairly big though, not my first choice.

Actually the days of big power gains through mufflers are pretty slim. Top sports bikes have pretty trick pipes. Improvements with road legal aftermarket pipes are rare. Race pipes can give a little, but we're not talking much at all.

Commuters & budget bikes are pretty crude in the muffler dept though. All saving money.

[richban]

From experience so far.

Straight through up to 50mm is fine provided you have enough volume in the muffler. Oval type sports bike mufflers work well. Also it is super crucial you don't pact the thing to tight. To tight makes them a lot louder. especially with the sheet pillow packing. If its a short header design and the muffler is under the bike then a small turn down facing the track will help.

Hope that helps.

[nathanwhite]

From experience so far.

Straight through up to 50mm is fine provided you have enough volume in the muffler. Oval type sports bike mufflers work well. Also it is super crucial you don't pact the thing to tight. To tight makes them a lot louder. especially with the sheet pillow packing. If its a short header design and the muffler is under the bike then a small turn down facing the track will help.

Hope that helps.

That does thank you! Starting to get an idea of what to go with. Just gotta save up the money now

[Henk]

You've got about two weeks to the next meet. Worst case nylon it up and run the stocker, plenty of time to go looking for more power later on. Your first time out on it the gains you will get from a better pipe probably won't make that much difference in any case and as suggested by others the biggest performance gains are likely found in round rubber things to start with in any case.

[RDjase]

As far as I'm aware, most if not all stock mufflers are not straight through so they can meet emmission and noise regulations. The main advantages offered by aftermarket systems is some increased power by a freer flowing exhaust, but mainly they weigh a lot less, thus increasing the power/weight ratio.

If this is correct, then what advantage would a stock R1 muffler offer over a generic cheapie excepting the noise?



Tires are a high priority, but I've had no idea what's avaliable. Thanks, I've got something to start researching with now.

What rim sizes on your bike? I have some BT39ss,

[nathanwhite]

What rim sizes on your bike? I have some BT39ss,

The rear says 90/90-18 and the front 2.75-18. I don't know what those numbers actually mean though.

[gav]

http://www.trademe.co.nz/motors/moto...-491795134.htm

Only need to use one muffler, sell the other ! Bargain!!

[Henk]

The rear says 90/90-18 and the front 2.75-18. I don't know what those numbers actually mean though.

Basically means you have 18 inch wheels so you are going to be stuck with threaded tyres. BT39ss are probably your best bet since the 900tt other option had the factory burn down sometime in the 90s.

[mossy1200]

Mines done.