exhaust stinger ?

[rbgaz]

Little bird told me you took the baffles out to see how it would run then put them back only for your end can to fall off and a lorry to run over it....

lol get it right sef it was a white van lol
p.s chelmsford big mac is not braintree big mac !!! lol

[RinB]

Here some theory

Stinger works as a pressure bleed valve and controls back-pressure
helping the port plugging efforts of the positive wave reflected by the convergence cone.

Basic stinger design should be 0.55-0.65 times the diameter of the head pipe.
Its length 12 times its diameter.

If the diameter is too small, or too long, you may have engine overheating problems.

There are new schools of thought on this though

[J1MS]

Here some theory

Stinger works as a pressure bleed valve and controls back-pressure
helping the port plugging efforts of the positive wave reflected by the convergence cone.

Basic stinger design should be 0.55-0.65 times the diameter of the head pipe.
Its length 12 times its diameter.

If the diameter is too small, or too long, you may have engine overheating problems.

There are new schools of thought on this though

I think your right about new schools of thought...
Going by some of the stingers now fitted to some performance bikes, much higher bleed pressures are being used.

[oldbiker]

Here some theory

Stinger works as a pressure bleed valve and controls back-pressure
helping the port plugging efforts of the positive wave reflected by the convergence cone.

Basic stinger design should be 0.55-0.65 times the diameter of the head pipe.
Its length 12 times its diameter.

If the diameter is too small, or too long, you may have engine overheating problems.

There are new schools of thought on this though

I think your right about new schools of thought...
Going by some of the stingers now fitted to some performance bikes, much higher bleed pressures are being used.

Check the tail pipes on kawasaki KR1 250`s