77kz1000 loses power

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08 Aug 2011 21:13 #467828 by wdizard
77kz1000 loses power was created by wdizard
My bike was running real good at warm up after she was warm she would idle good but I would lose power when I tryed to go fast. Does anyone have the same experience?Did you find out how to fix this?Could you help explain how to fix to me?

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08 Aug 2011 21:51 #467841 by 650ed
Replied by 650ed on topic 77kz1000 loses power
Are you using the stock airbox or pods?

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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08 Aug 2011 22:54 #467868 by wdizard
Replied by wdizard on topic 77kz1000 loses power
stock airbox:)

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08 Aug 2011 22:57 #467869 by wdizard
Replied by wdizard on topic 77kz1000 loses power
I am using a stock airbox, the bike has run intermittly over past two years, it was tuned up by a mechanic 2 years ago.

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08 Aug 2011 23:12 #467873 by Patton
Replied by Patton on topic 77kz1000 loses power

wdizard wrote: My bike was running real good at warm up after she was warm she would idle good but I would lose power when I tryed to go fast. Does anyone have the same experience?Did you find out how to fix this?Could you help explain how to fix to me?


If not already done, would assure correct functioning of the timing advancer, which may require lubing or both cleaning and lubing, as it might be sticking in the closed "idle" position, which could cause the reported symptoms.

Would also assure valve clearances are within factory specs.

If the original points ignition is still fitted, would assure it's perfectly set up.

Good Fortune! :)

1973 Z1
KZ900 LTD

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08 Aug 2011 23:12 #467874 by wdizard
Replied by wdizard on topic 77kz1000 loses power
I have new accel coils, all the connections are clean and full power is at the coils. The petcock is brand new, the spark plugs are new.The batterry is good.I have two new in line gas filters:)

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08 Aug 2011 23:15 #467875 by wdizard
Replied by wdizard on topic 77kz1000 loses power
I have a dyna s point setup and I am not sure how to check it or lube it, any suggestions/
Thanks Greg

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08 Aug 2011 23:47 - 08 Aug 2011 23:47 #467886 by Patton
Replied by Patton on topic 77kz1000 loses power
Lube pivot pin areas on the timing advancer, which should be should be accessible through the timing inspection window.

Best to use a strobe type timing light to assure proper functioning of the advancer, by watching it move quickly back and forth as rpm is varied by blipping the throttle.

Here's what the adancer looks like under the Dyna-S backing plate:


Not supposed to look all rusty and crappy like this:


To set ignition timing with Dyna-S, align the F mark with the permanent case mark at idle rpm, using a strobe type timing light, same as with points ignition system.

Good Fortune! :)

1973 Z1
KZ900 LTD
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Last edit: 08 Aug 2011 23:47 by Patton.
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09 Aug 2011 00:14 - 09 Aug 2011 00:15 #467896 by Old Man Rock
Replied by Old Man Rock on topic 77kz1000 loses power
"would lose power when I tryed to go fast."..
We'll need a tad more info such as the following.

After warm up...
Examples:
* Still Idle's at specification 900-1200rpm pending exact model and top end build.
* Sluggish off the line then takes off like a banshee...
* Sluggish until mid rpm range...
* Back fires in low to mid RPM in accelerations/deceleration...
* Pull strong to 5 Krpm then starts to flatten out...
* Hesitates when twisting her after 6 Krpm then takes off or not at all...
* Pulls well up to 3/4 throttle...
* Crap performance throughout the entire RPM range...
etc...

Holding at 65mph, let go of the the throttle, she back fire on ya....
Holding at 65mph, she surge back and forth a tad...
Most probable cause, too lean in both cases...

Now keep in mind, huge jump in temperatures, humidity air density etc... she'll run rich or lean pending conditions. Example, you change elevations recently where running, she'll run rich due to thinner air.

Maybe this will help just in case...



1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter

Phoenix, Az
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Last edit: 09 Aug 2011 00:15 by Old Man Rock.
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09 Aug 2011 13:45 - 09 Aug 2011 13:53 #468014 by wdizard
Replied by wdizard on topic 77kz1000 loses power
It speeds up when I put the choke on.It speeds up when I put the choke on. this happens at the same time I am increasing the throttle.

Does that idicate anything?
Last edit: 09 Aug 2011 13:53 by wdizard.

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09 Aug 2011 14:35 #468022 by wdizard
Replied by wdizard on topic 77kz1000 loses power
Before I cleaned my connections and installed new accel coils my mechanic put smaller jets in all of my carbs. Is it hard to explain to me how to change the jets to a bigger size? I would like to do that myself if it is possible

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09 Aug 2011 18:05 - 09 Aug 2011 18:06 #468050 by wdizard
Replied by wdizard on topic 77kz1000 loses power
Before I cleaned my connections and installed new accel coils my mechanic put smaller jets in all of my carbs. Is it hard to explain to me how to change the jets to a bigger size? These are stock carbs and the motor is a 1075. I live at about sealevel. two years ago the bike was put on a dino and was running good, It sat last winter and now it has new coils with full power and it seems like the jets are too small. I would like to do that myself if it is possible.









Well, I determined that the petcock was not in the right position yesterday, but now I am able to ride but at 7000 rpm it cuts out, any ideas?
Last edit: 09 Aug 2011 18:06 by wdizard.

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