1200 cc speed knocking??

martijn
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1200 cc speed knocking??

18 Jul 2006 02:05

#62803

started up my standard KZ900 bored to 1200cc and it made quite some noise. Especially under load it's I think , knocking. Is that possible??? or do I have to use higher octane gas??
As mentioned everything is standard except 1200 cc

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Martijn

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wiredgeorge
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Re: 1200 cc speed knocking??

18 Jul 2006 05:47

#62831

What compression pistons are you using?

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

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wireman
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Re: 1200 cc speed knocking??

18 Jul 2006 06:07

#62840

have you checked your timing?

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trippivot
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Re: 1200 cc speed knocking??

18 Jul 2006 06:23

#62847

carbon build up on the piston top in the summertime heat
will make your bike knock and ping big time

run a simple decarbon technique to get the big build up off of the piston crown it may help

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martijn
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Re: 1200 cc speed knocking??

18 Jul 2006 07:38

#62871

The combustionchambers are clean and there are brand new valves in it. The piston are normale ones (not with higd cams) compression is 10.25

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wireman
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Re: 1200 cc speed knocking??

18 Jul 2006 10:18

#62904

yeah thats an old air cooled engine,if its hot outside it could be a problem.they are more tempermental than water cooled engines.try some 89-91 or maybe retard timing a little bit,but not too much or it will run hot.

goodluck,happy wrenching!

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wireman
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Re: 1200 cc speed knocking??

18 Jul 2006 11:39

#62923

i just noticed your carb post says something like 12.25:1 which pistons do you have?:whistle:

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martijn
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Re: 1200 cc speed knocking??

18 Jul 2006 23:40

#63085

I found the problem for the pinging/knocking. Apparently the camchain was ratching one tootht of the intake cam, caused almost valve bounce. Happend when doing some maintenance, putting the bike away for a month and wasn't paying any attention to it.
Tonight another try!!!

Thanks for you replies
Martijn

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wireman
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Re: 1200 cc speed knocking??

18 Jul 2006 23:50

#63087

any damage?:S

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martijn
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Re: 1200 cc speed knocking??

22 Jul 2006 01:31

#63828

No damage. Now I'm struggeling to keep it running at idle speed. I retarded the ignition and under load at 2000 up to 3500 its still knocking. I'll try tonight a higher octane gas.

martijn

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martijn
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Re: 1200 cc speed knocking??

24 Jul 2006 13:16

#64299

I thought I had fixed it but it's still knocking. It's now running on high octane gas. Can anyone tell if a KZ1000 bored to 1200 cc with allother parts standard (except 4 into 1) can run normally without knocking??? compression is about 160-170 PSI!!

Martijn:angry:

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KawasakiJockey
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Re: 1200 cc speed knocking??

24 Jul 2006 16:28

#64344

How high of octane? 93 at the pump wont do.

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