OP
@beatnik avatar
UTC

Enthusiast
Retro 2012 Vespa PX125, LML 5 port cases, reed valve, Mazzu crank, 166 Malossi, 24/24 Si carb with Polini intake kit, SIP Road II, chrome and leather
Joined: UTC
Posts: 83
Location: London, England
 
Enthusiast
@beatnik avatar
Retro 2012 Vespa PX125, LML 5 port cases, reed valve, Mazzu crank, 166 Malossi, 24/24 Si carb with Polini intake kit, SIP Road II, chrome and leather
Joined: UTC
Posts: 83
Location: London, England
UTC quote
First of all, great exhaust. I only removed it to try and locate the source of a low power issue I'm having, not to bin it.
Having just removed it I have discovered an issue. This box, arrowed, contains a square nut. It means you only have to use one socket or spanner to bolt it on as the box stops the square nut rotating.

When it's nice and clean and new that is...

My exhaust has been on for about 18 months. It is still solid but covered in surface rust and crud etc. When I tried to remove it, the nut inside the box simply turned with the bolt and split the box apart. Then it just rotated freely. Obviously I couldn't get a spanner onto the nut and had to improvise. After about an hour and trying with thick bladed screwdrivers I finally managed to wedge a narrow chisel between the box (there's not a lot of room and it was further disintegrating with each attempt) and the nut and with copious amounts of WD40 it finally freed.

The box was getting really chewed up to this point and I was starting to wonder how the hell I was going to get the exhaust off.

Once finally removed I hacksawed the remainder of the chewed box off and put the exhaust back on using a socket on the bolt and a 17mm spanner on the square nut.

If you buy a SIP Road II (and I recommend it) I would remove this box before fitting and just use a spanner. It could save an awful lot of grief later on.
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@bobo avatar
UTC

Ossessionato
'70 Super 150, Medley 150S, '23 Ducati Monster SP
Joined: UTC
Posts: 2533
Location: Sydney, Australia
 
Ossessionato
@bobo avatar
'70 Super 150, Medley 150S, '23 Ducati Monster SP
Joined: UTC
Posts: 2533
Location: Sydney, Australia
UTC quote
That captive nut is a pain in the arse. Even when putting the exhaust on the nut jiggles around and is hard to line up with the bolt. Ripping off those tabs is a good idea.
@alanmac avatar
UTC

Molto Verboso
'74 Rally, '72 Sprint
Joined: UTC
Posts: 1147
Location: Melbourne, London, Durham NC
 
Molto Verboso
@alanmac avatar
'74 Rally, '72 Sprint
Joined: UTC
Posts: 1147
Location: Melbourne, London, Durham NC
UTC quote
Yup. Mine broke off whilst I was riding and before I knew it I was bumping over the exhaust as it fell off.

Was a loud slow ride home. Lucky I was only a few k's away and didnt have to faff about too much.
@jimbod avatar
UTC

Hooked
61 VGLA
Joined: UTC
Posts: 217
Location: Melbourne, Australia
 
Hooked
@jimbod avatar
61 VGLA
Joined: UTC
Posts: 217
Location: Melbourne, Australia
UTC quote
Good tip, I'll be sure to remove mine pre install. Cheers!
@ginch avatar
UTC

Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8793
Location: Victoria, Australia
 
Veni, Vidi, Posti
@ginch avatar
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8793
Location: Victoria, Australia
UTC quote
Yep, it's crap. Takes ages to get the bolt started unless you're lucky.

I used a nut like you but had a lot of trouble holding it in position. My latest bodge was to use the nut & cage from an old exhaust I was going to toss. It's a much better tighter fit than the sip one. And it's much easier to hold in position to get the bolt started.
Forum member supplied image with no explanatory text
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