Hole in exhaust. What effect will in have?

[Lord Percy]

Started it while cold today and smoke came out of the wrong bit. I don't mind replacing it, but I'm just interested in what the actual effects are of a hole being there? On my bike the hole is more than halfway up the exhaust.

And I suppose I may as well ask if there's a way of patching it up..?

Cheers!

[Matt-]

Nothing much will happen to it, most defiantly it will make it louder.

If you have the money replace it for maybe a aftermarket system

Matt
____________________
RIP jack (wheelie king), you will never be forgotten.
Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010

[Lord Percy]

Yep it's louder, quite embarrassing actually, hah. It sounds sort of cool but the speed of the bike doesn't match it. I had some guy overtake me the other day, beeped his horn at me and looked over, laughing and did a little pisstake action of a biker-boy-racer revving a motorbike, then carried on driving. Haha.

I dunno much about aftermarket exhausts. Although I remember reading in my Haynes book that the exhaust system for my bike (jsut a GN125) is pretty well optimised as it is, so sticking a new one on would usually be worse or have no effect.

I have no idea though. What are my options...?

[Matt-]

[at106]

Whereabouts is the hole, and is your exhaust made up of one or two parts?

[Lord Percy]

New one looks to be around £50+.

The exhaust is a whole unit so I think it needs to be a straight swap if I do get a new one.

The hole is halfway up the big back end bit, facing towards the inside of the bike, so I can't see exactly because it's at a point which is really hard to view. The main thing is that every bit of smoke was coming out of this unknown point when I revved the engine. I think this hole is quite a new development. However the bike was bought from E TWO MOTORCYCLES so who knows if the exhaust already had a hole and he just gave it a quick patching up before selling it on.

Anyway if it comes to it I'll just have to fork out the 50 and fit a new one. If i do change the exhaust, what else do I need to consider? When I look on ebay there are various copper and alloy 'exhaust gaskets' to choose from. Would I need to get another one of those too? I take it it's the seal between the engine and the exhaust...?

[at106]

Not much help now but some suzuki 125's have a 2 piece exhaust and i have a spare header bit which you could of had.

If there are any engineering places around, you should be able to get it welded for around £10

[janner_10]

Stick up a pic mate, someone could advise how to repair it.
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Yamaha FZS600 (Now gone to heaven) > CBR600F4i (SOLD) > '99 YZF-R1

[Rogerborg]

Ah, diamond geezer Vinny again?

Baked bean tin, gun gum and a jubilee clip will patch it up for a while, but it's likely rotting from the inside out. Break out the piggy bank.

When you replace the exhaust, yes, fit a new gasket, just whatever's cheapest. Make sure you dig the old one out, it can be squashed so flat that it's hard to tell that it's separate from the exhaust port.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[MaybeGuy]

[Lord Percy]

Ahhh man too late and too dark to start dicking around with exhausts!

It can't be seen without removing the thing, and as far as I know the hole is probably a typical one, most likely down to rust or wear at a point where it's been rattling too much against the frame.

Aside from this leak, the whole thing is in totally fine condition - no bad bits or rust anywhere. I can't even see rust in the area where the hole is, but I can't specifically see the hole so there might be some in the deep dark corner where it's buried. The exhaust is a matte black one, which is odd because the standard one is chrome. However the old Haynes says there is also a matte black option for the bike, so I guess mine has it!

[Lord Percy]

oh and his name keeps popping up because my bike has had SO MANY PROBLEMS since I bought it from him! So I make sure to give his name a plug each time I make a new topic with another problem.

[Matt-]

If you can't weld it, do the exhaust paste trick...

If its got to much back pressure and it blows the paste out,

Get a new exhaust

Matt
____________________
RIP jack (wheelie king), you will never be forgotten.
Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010

[Pete.]

A hole in the exhaust will affect smooth running and reduce your accelleration. Better to get it fixed or replaced.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Lord Percy]

Exhaust paste!! Amazing! I'll get some tomorrow. CHEERS!!!!!!!!!

[flumpy7]

[Rogerborg]

Paste ("gun gum") is likely to just blow straight out of the hole. You can spend ages prepping it in the hope of getting a good solid key, or you can wrap a bean tin and a jubilee clip (or just twist some wire) around it.

Either way, a replacement exhaust sounds so cheap that you should think twice before starting down the mend-and-make-do route - the time and cost of repeated bodging will quickly add up.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Lord Percy]

Yeah, very fair point actually. I bought the bike in unexpectedly shite condition, so it's become a bit of a goal for me to get into perfect order, if anything so I can at least come close to selling it for the amount I paid! Although I might try keeping it forever. Apparently lots of people wish they'd kept their first bike...

[Alpha-9]

Where is the hole?

Is it big?
Long as it isn't the drain hole which is meant to be there, I thought mine was a hole too but it was just that, noticed when I ACF50'd my exhaust and the next day steam/smoke came out the hole
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Fzr-600 1999

[Lord Percy]

Ok so here's a picture showing where the holes are. Yep, the hole is now 'holes'. I found them and there are a few holes - blatant rust - halfway along at the bottom.

I've attached a 'diagram' to show exactly where.

So I now do have a new one coming in the post. However I'm still interested in what effect these holes will have? The reason I ask is that my bike seems to have a fucking terrible top speed, so I wonder if these holes might have been the cause of it.

[Alpha-9]

Post up some pics of your bike and the hole from different angles
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Fzr-600 1999

[Lord Percy]

Oh man, this is like BCF homework! I guess it's still just about light enough.....

[Lord Percy]

Hard to make out but there are three holes at the point where it just starts to widen out. They're centre-left on photo. Pretty tough to spot but they're undoubtedly there. All about 3-4mm in size. And that's the only angle I could get because of how tucked away that bit is.

[tomh]

Vince will have painted it himself, he does it to every bike... after a month the paint will look shit if it is anything like mine was. I removed the paint with some emery paper and cleanned the chrome up which wasn't in that bad of a condition anyway, just a section with the chrome missing.

On my CG, where you say your hole is in your diagram there is a drain hole which gets rid of excess water in the pipe. It noticeably blows fumes through the hole but is completely normal. It could be similar on your bike as well.

[Lord Percy]

Ah right ok, that's interesting. It's just that the bike sounds like it's trying to be a chopper at the moment, which I assumed wasn't right. Anyway I've already ordered a new one because the holes really don't look like they should be there, so we'll see!