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No power above 6000rpm
- Jrbrownie00
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The bike is an 82 kz750 ltd, 4-1 Mac exhaust, stage 3 jetted and z1 pods.
The bike runs excellent up to about 6000rpm and then it cuts out. I don't believe it to be carb/pod related though I'm sure no one will agree with me. I say this because it did this well before I ever jetted or put pods on. In fact it's done this for the 4 months I've owned it.
What I have done: thoroughly cleaned carbs, replaced needles and carb gaskets, jetted and synced carbs with vacuum gauges. New plugs, cleaned stock wires. Lubed and inspected timing advancer, clear tube method inspecting float levels, cleaned all electrical connection with Emory cloth and electric cleaner
Is it ignition? Fuel? The plugs are dark and sooty but I'm not an expert at plug reading.
82' kz750 ltd.
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- koolaid_kid
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Can you describe the jetting / tuning process? Like, did you install the main jets, do a plug chop and plug read, etc.?
I found that the Dynojet mains tend to be too big and I need to go down 2-3 sizes from what they ship.
If you need, I can find the website where they tell you how to do jetting/plug chops. Actually, I left a link in another thread here if you want me to find it for you.
Carb tuning link
1983 GPz 750
810 Wiseco, Kerker, K&N, DynoJet S3, Accel, Progressive, etc.
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- Jrbrownie00
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82' kz750 ltd.
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- koolaid_kid
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Report back your results.
I placed the link in my previous post.
1983 GPz 750
810 Wiseco, Kerker, K&N, DynoJet S3, Accel, Progressive, etc.
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- Jrbrownie00
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82' kz750 ltd.
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- koolaid_kid
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Main jets
Adjustable needles
I figured you had the Keihins but the process is the same, tune the mains first, the needle second, then the float height.
The older VM style carbs tune the other way around, bottom up instead of top down.
1983 GPz 750
810 Wiseco, Kerker, K&N, DynoJet S3, Accel, Progressive, etc.
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- koolaid_kid
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1983 GPz 750
810 Wiseco, Kerker, K&N, DynoJet S3, Accel, Progressive, etc.
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- Patton
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Is the original ignition still fitted?
What spark plugs are fitted (probably should not be "R" plugs)?
Good Fortune!
1973 Z1
KZ900 LTD
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- Jrbrownie00
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Patton wrote: Are the original ignition coils, caps, and plug wires still fitted?
Is the original ignition still fitted?
Good Fortune!
All original as far as I know. The reason I think ignition is the way I lose power. It literally sounds like its misfiring and cutting out. Almost like I'm taping rev limiter but I still have about 3000 rpm to go. I'm fairly new to motorcycles or anything carbureted really so I could be wrong.
82' kz750 ltd.
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- koolaid_kid
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All you have is the signal generator on the end of the crank, the ignitor, the coils and the plugs. Of course, you might want to check the wiring between each of the components.
1983 GPz 750
810 Wiseco, Kerker, K&N, DynoJet S3, Accel, Progressive, etc.
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- Jrbrownie00
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82' kz750 ltd.
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- Patton
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And sometimes old resistor style plug caps may provide too much resistance.
Old ignition coil(s) might possibly have developed an internal short at higher rpms.
The Kawasaki dealership likely has an ignition coil electrotester that determines strength of the furnished spark under load at high rpm.
Good Fortune!
1973 Z1
KZ900 LTD
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