Blackbird 4-1 exhaust

[jtzzr]

I`m contemplating putting a 4-1 on the Bird and just wondering what`s involved, it`s a 97 carby model ,do I buy a new pipe and do the carbs/timing all have to be adjusted , any advice appreciated.

[AllanB]

What type/brand of system?

Some are sold as replacements requiring no alterations.

All will benefit from a carb resetting/jetting even the ones that 'do not require it' If you have access to someone who knows what they are doing with carbs it would be worth spending a few bucks.

A 4-1 gives better top end, a 4-2-1 (as a lot of stock systems are now) are better all round (less top compared to a 4-1, but better across the rev range).

If you are just after a bit more noise go for a slip on can.

[AllanB]

Forgot to add a picture - Neptune pipes made in NZ.

[jtzzr]

Cheers AllanB , will probably look at the slip ons ,just wanted to make her louder so cages could hear me.

[Zapf]

Slipon's don't change your 4-1 or 4-2-1 arrangement. So just go for it

[AllanB]

Cheers AllanB , will probably look at the slip ons ,just wanted to make her louder so cages could hear me.

Get one of the brands with a removable db restrictor - just about all of the after-market ones now have a insert in the rear to reduce the noise to 'legal' levels (usually quite a bit deeper and a wee bit louder than stock. You can pull these out for 'race' use ahem ahem and insert them again for WOF use!.

Check out this link for your bike and you can see the db killer insert.

http://www.scorpion-exhausts.com/Bik...3.php?model=17

[vifferman]

Get one of the brands with a removable db restrictor - just about all of the after-market ones now have a insert in the rear to reduce the noise to 'legal' levels (usually quite a bit deeper and a wee bit louder than stock. You can pull these out for 'race' use ahem ahem and insert them again for WOF use!

You do realise that it's more'n likely that once They start enforcing zorst noise levels, any bikes fitted with removable restrictors will probably be automatically failed? The problem is they don't comply with the part of both the new and old regulations that state that the exhaust is not allowed to be readily modifiable by the owner/operator so as to change its operation. Once They get their Baton of Bureaucracy out, the restrictors will have to be welded in place.

[Blackbird]

Once They get their Baton of Bureaucracy out, the restrictors will have to be welded in place.

Our esteemed fellow member Freebird (a Blackbird owner of course) was recently appointed senior mechanical engineer at Land Transport. I think he has an interest in noise emissions. It will be refreshing to have someone to represent motorcyclists views provided he doesn't get overruled by public policy wallies without a clue.