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Will twin exhausts on a bandit 600 be okay?

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dragstaar
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PostPosted: 18:36 - 03 Mar 2011    Post subject: Will twin exhausts on a bandit 600 be okay? Reply with quote

Hi

I've just purchase these from Bandit Mania

Clicky

They told me that its just plug and play, no need to rejet. (i have no idea what re-jetting is btw but i know its something i will have to pay for, and thats reason enough for me not wanting to do it lol)

However, a couple of people have told me that i might lose compression? (once again, what the effect of losing compression is, i don't know, but it sounds bad)

I don't care about power and speed, i just like the look, and i want my engine to stay healthy. Am i going to have to get this re-jetted before i can use them, or will they be okay to just carry on as normal.

I will be using 2 BlueFlame Evo Twin outlet exhausts with the baffles removed.

Any helps would be appreciated muchly!
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Livefast123
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PostPosted: 18:51 - 03 Mar 2011    Post subject: Reply with quote

Quite why you would lose compression when you've just fitted a short exhaust system is beyond me. Were these people drunk or pub mechanics. Rolling Eyes

The only way you would lose compression would be if your piston rings were worn or you have a leaky valve in the engine etc not by fitting a exhaust.

Easy way to know is fit the exhaust then do a plug chop, then you'll know if you need to rejet or not. Just read your post again..........jets in the carb control the various stages of fuel mixture throughout the rev range. When you change a component on the engine you sometimes need to resize the jets due to the increase exhaust/airflow coming out of or into the engine to make the fuel mixture correct. Running a rich or lean mixture can cause bad running of the bike and running lean is especially bad for an engines health.

You can check your mixture by the colour of your spark plugs. White is lean, Black is rich and tan/coffee is correct.

Google plug chop.
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Teflon-Mike
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Joined: 01 Jun 2010
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PostPosted: 19:02 - 03 Mar 2011    Post subject: Re: Will twin exhausts on a bandit 600 be okay? Reply with quote

dragstaar wrote:
Hi

I've just purchase these from Bandit Mania

Clicky

They told me that its just plug and play, no need to rejet. (i have no idea what re-jetting is btw but i know its something i will have to pay for, and thats reason enough for me not wanting to do it lol)

However, a couple of people have told me that i might lose compression? (once again, what the effect of losing compression is, i don't know, but it sounds bad)

I don't care about power and speed, i just like the look, and i want my engine to stay healthy. Am i going to have to get this re-jetted before i can use them, or will they be okay to just carry on as normal.

I will be using 2 BlueFlame Evo Twin outlet exhausts with the baffles removed.

Any helps would be appreciated muchly!
Karma


Using fully baffled slip ons, the back pressure may not be effected by thier re plumbing, with straight thru's, I'd not be so sure.

Did they confirm that the bike wouldn't have to be re jetted in conjunction with your choice of slip on?
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dragstaar
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Joined: 18 Aug 2010
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PostPosted: 22:16 - 03 Mar 2011    Post subject: Reply with quote

Yeah, i'm going to run 2 straight through pipes. I'm running a single straight through can at the moment and there doesn't seem to be any issues. They guys at banditmania asked me what cans im using and when i told them they said i shouldn't need to do anything.

To be fair, these guys who told me this may well have been talking shyte though.

Thanks for the help, i shall fit them and see what needs doing from there
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Bezzer
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PostPosted: 22:47 - 03 Mar 2011    Post subject: Reply with quote

CHR15 wrote:

bandits are jetted rich anyway.


You're joking, they've never been rich as standard. Same as almost every other bike they've always on the lean side to keep within emission levels until they finally had to go FI when they couldn't keep up with legislation.
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Bezzer
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PostPosted: 12:05 - 04 Mar 2011    Post subject: Reply with quote

CHR15 wrote:
Quote:
You're joking, they've never been rich as standard.


well, running a straight through can on stock jetting and a k&n panel, i'm getting a lovely crisp 13.5:1 afr at wot and fairly steady 12:1 through the midrange on the middle needle clip.


Kinnel that's not bad for standard jets? had to up mine to 110 with just a can and I know of plenty who've had to rejet with a can and K&N.
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Souleh
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Joined: 08 Nov 2010
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PostPosted: 12:15 - 04 Mar 2011    Post subject: Reply with quote

I would imagine theyre talking about back pressure in the exhaust which can be pretty fundamental. On a non turbo a certain level of back pressure is a good thing! Too free flowing and itll actually lose power.

The best exhaust for a turbo is no exhaust, however
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dragstaar
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PostPosted: 12:24 - 04 Mar 2011    Post subject: Reply with quote

Wow, i am so confoos. I have much to learn i see. But my bike isn't turbo'd so I'm okay there. And i have no idea what all those numbers these guys are quoting are. i don't really care about speed or power, i just don't want my engine to be fried after a few months of using my new exhausts!

Ghey, the exhaust pipes came today and one was oval Sad quite how that happened i don't know.

So I've sent them back and have to wait again (hopefully Banditmania don't decide to be dickheads and try and say i did it or something, But they seem reasonable enough so i hope not)
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Kickstart
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Joined: 04 Feb 2002
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PostPosted: 12:45 - 04 Mar 2011    Post subject: Reply with quote

Livefast123 wrote:

Easy way to know is fit the exhaust then do a plug chop, then you'll know if you need to rejet or not


Plug chop only tells you anything about the jetting at the throttle position you were just using, which with slide carbs is mainly useful for full throttle. With CV carbs the mixture is dependent on throttle position, revs and pretty much load so it won't tell you much. Perfectly possible to be rich in some places and lean in others.

Souleh wrote:
I would imagine theyre talking about back pressure in the exhaust which can be pretty fundamental. On a non turbo a certain level of back pressure is a good thing! Too free flowing and itll actually lose power.


I suspect they mean back pressure as well, but it isn't the amount of pressure that matters it is where the pressure waves are bounced back from.

All the best

Keith
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