81 650 csr, stock jetting?

  • krcrawford29
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12 Jan 2008 15:43 #188907 by krcrawford29
81 650 csr, stock jetting? was created by krcrawford29
can anyone tell me what the stock jetting is and where I should be at?
White plugs
Low power above 6000 rpm.
Just installed pod filters.
1981 kz650 csr.

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14 Jan 2008 17:35 #189289 by rstnick
Replied by rstnick on topic 81 650 csr, stock jetting?
Here is some jetting info I've got saved on the computer, and may be elsewhere on this site as well:

Jetting guidelines for the KZ650

Here is a simple set of jetting guidelines that have worked for me. For those considering jet changes, this might help select a starting point.
• 1 jet size for pod (K&N, Uni, generic) filter (single inside the air box)
• 1 jet size for drilling out the bottom of the air box
• 2 jet sizes for both single K&N and drilled air box
• 2 jet sizes for individual pod filters
• 2 jet sizes for 4 into 1 exhaust
• 1 pilot jet size for every 3 main jet size increase
Add up all the jet size increases and subtract one. (Remember they go in steps of 2.5 for each jet size).
Check plug spark plug colour often, sync carbs after each jet change and make sure the floats are set correctly.
Example
• Stock main jets: 102.5
• Stock pilot jets: 15
• 2 sizes for 4 into 1 exhaust
• 2 size for pod filters
• Main Jet Calculation = (2+2) - 1 = 3 size main jet increase or 102.5 + (2.5 * 3) = 110
• Pilot Jet Calculation = 1 size pilot jet increase or 15 + (2.5 * 1) = 17

Rob
CANADA

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1978 KZ650 C2, 130K kms, Delkevic ex, EI, CVK32, PMC easy clutch, ATK fork brace, steering damper, braced swingarm, 18" Z1R front wheel.
2000 ZRX1100
2011 Ninja 250R
2005 z750s

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