Exhaust blowing

[colink98]

My CBF600 is a little on the old side so i don't get too fussed about it being a bit noisy, However i think its developed a bit of a blow from the exhaust.

https://youtu.be/9Mlg-x07fr8

that flange the holds the exhaust in place doesn't look too secure either.

second opinions please.
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PCX125 (stolen) - CBF600 (current)
Ride it like you stole it.
ride sensible and not like an idiot and you wont get 6 points in one week.

[ADSrox0r]

Yup, looks like it's the joys of removing corroded exhaust studs for you sunshine
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Current bikes: '08 VFR 800 VTEC(yo) , '07 ZZR1400 Winter hack: '95 Aprilia 650 Pegaso Currently lusting after: RC30

[Baffler186]

I'd drench that in plusgas every evening for a week, whilst you wait for the parts to arrive.
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Current: 2009 SV650 S, 1990 Kawasaki GT550
Previous: 2009 CBF125, 1998 GSF600, 2004 FZ6 Fazer, 1978 CB400a Hondamatic

[Pete.]

Sounds like the header tops have rotted out. Find some new downpipes before you touch it is my advice.
____________________
a.k.a 'Geri'

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

[RhynoCZ]

To take the exhaust off, safely. Spray all the nuts with WD40 / or penetrating oil and let it sit before you attempt to take them off (it helps if you tap the nuts with a hammer before you try to move them). After that, get the right size socket, or use a spanner, and now, you want a instant torque there to break the tension. So put the socket/spanner onto the nut, make sure the socket/spanner sits on the nut firmly at 90° and give it a impact/vigorous twist. This will break the tension and won't harm the studs and/or nuts.

DO NOT just slowly turn the wrench/spanner.
DO NOT use a long bar.

Broken studs and stripped nuts are nothing fun to deal with, especially when the studs break near the head.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[colink98]

Grim....

as its my daily ride there is a limited window in which to get stuff done. id rather not order lots of parts until i know what i need.
At the same time i don't want to have the bike in bits and have no ride.

I have the week off at Xmas from the 24th until 3rd.
Maybe that's a good time to strip it down and see what's what.

or I will tell the the wife I obviously need a whole new bike.
____________________
PCX125 (stolen) - CBF600 (current)
Ride it like you stole it.
ride sensible and not like an idiot and you wont get 6 points in one week.

[Polarbear]

[colink98]

[RhynoCZ]

I see, well I would be taking the exhaust off to make a visual check of the exhaust seals then. Who knows how sloppy the mechanic was.

I know you do not want to do any of that, so just clean the studs (take the desired nuts off before you do) and give it proper Nm of torque.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[colink98]

[skatefreak]

Had to get the headers off my F3 this summer.

5 out of 6 studs backed out of the head and one snapped.
Ended up welding half a stud onto the broken one .

Is it particularly common for the studs to back out of the head before the nuts break free?

[RhynoCZ]

[Rogerborg]

[skatefreak]

GT85, plus-gas and diesel (not all at the same time), blow torch and tapping a socket + extension.

Could not get the nuts off with the studs out the head for fear of breaking the studs either. The bike has spent a few years outside though

[colink98]

Ordered some PlusGas from Eurocarparts who have a 25% off coupon for today.
____________________
PCX125 (stolen) - CBF600 (current)
Ride it like you stole it.
ride sensible and not like an idiot and you wont get 6 points in one week.

[neptune8]

Order some new studs.
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Enjoy yourself, its later than you think

[Itchy]

Why is everybody talking about removing the studs?

Unless they are badly corroded then you simply use a nut splitter or a dremel to cut the old nuts off carefully and slowly (don't apply too much force).
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Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching.

[colink98]

Some lessons learned.

1. PlusGas works a treat.
2. Not setting your torque wrench to the correct newton meters will snap studs.
3 The metal exhuast gaskets (on the CBF600) are really a one time fit and never really work if refitted.

all back together with new gaskets and sound as new.
____________________
PCX125 (stolen) - CBF600 (current)
Ride it like you stole it.
ride sensible and not like an idiot and you wont get 6 points in one week.

[Itchy]

[arry]

[Rogerborg]

Cheer up, you can easily snap studs even if your (randomly calibrated) torque wrench is correctly set.

I'm glad it all came together in the end though.
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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