Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: Paull on November 10, 2012, 04:48:05 PM
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Hi All,
I what to know the sizes of the holes in the jets in mm i.e 110 = what, so I can re drill the jets i have until i hit the right number.
I have built a new exhaust system to quieten the 550/4 chop down, 2 into 1 into a common silencer box under the frame but know it runs rough. (needs more fuel).
With 4 straight throughs, it went like a scolded cat, but it was way to load.
With the new system it is whisper quiet (and before anyone says its to restricted the silencer is of a re direction type. Newton third law and all that).
Thanks
Paull
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Normaly, if you restrict the exhaust you need less fuel and if your mains are 110 they are way oversize compared to standard
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Hi Bryanj,
The pipes are none restrictive, they have been engineered too oppose sound waves against each other.
The design is simple but very effective.
I have 98 mains and it ran very will indeed.
Because I have re engineered the pipes in such a way that they scavenge a lot more gases out of the exhaust ports by creating a low pressure bridge between exhaust into the pipes and out of them , leaving a space for more fuel air mix making for bigger bang and more power.
This is the theory anyhow (I have done a mathematical model of it and it should work well).
Paull
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To answer your question, I believe that 110 = 1.1mm
I've never done it though...
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Thanks Steve.