What is this tube for?

[guile]

Does anyone know what the left tube is for and what it's called? (on the right the exhaust)
Thanks

[Lord Faversham]

Yes it’s the PAIR pipe. It’s all to do with your emissions. It introduces a burst of air into the exhaust so that any unburnt fuel ignites and keeps your emissions down. It can sometimes cause exhaust popping and other times it can help suppress it.

Some say it’s not essential to the running of your bike and I guess it’s not. You could blank it off but your emissions may suffer negatively. This may not be an issue for you unless you are concerned about the plight of  Polar Bears. [emoji16]

Personally I like a bit of pop and bang on the overrun.

I simply replaced my pipe and the reed valve on my scoot when I got it as the pipe was rusted through.

Hope this helps


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[guile]

Thanks

So I could just pinch it to close it up?

[Lord Faversham]

I don't think you'd get a good enough seal if you did that, not only that it would be irreversible so if you get adverse effects you'd have to buy a new pipe. 

The best way is to whip the pipe off, (four bolts) then to use the flanges on each end to trace a shape on some ally sheet and then drill out the bolt holes so you have a couple of blanking plates.  A bit of instant gasket and job done.

[guile]

Thanks
Will try that, but I'm afraid the bolts are too old..

[de dee]

I did plug my tube by screwing in a bolt of the proper size in the end . and did not cut the tube just let it hang,  or zip tie it,

[Lord Faversham]

@guile.

I had a similar issue, or thought I did. But I kept spraying WD40 on the bolts over the course of a few days and they came undone surprisingly easily.

In the UK they salt the roads every winter so corrosion is a major challenge. My 500i was a basket case when I bought it and was 11 years old and the nuts were really rusty. However I cleaned them off with a wire brush drill attachment first and it’s all turned out ok now.

Mechanically these things are better than you might think.

I’d give it a shot at using some anti-seize on the bolts and have a crack at getting them off. You may be pleasantly surprised. If a stud snaps or you round a nut off, you always still have the option of cutting the pipe off and jamming a bolt in, if that way would be an option for you. (It wouldn’t for me). 


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