1200 cc speed knocking??

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18 Jul 2006 02:05 #62803 by martijn
1200 cc speed knocking?? was created by martijn
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

thanks
Martijn

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18 Jul 2006 05:47 #62831 by wiredgeorge
Replied by wiredgeorge on topic 1200 cc speed knocking??
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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18 Jul 2006 06:07 #62840 by wireman
Replied by wireman on topic 1200 cc speed knocking??
have you checked your timing?;)

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18 Jul 2006 06:23 #62847 by trippivot
Replied by trippivot on topic 1200 cc speed knocking??
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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18 Jul 2006 07:38 #62871 by martijn
Replied by martijn on topic 1200 cc speed knocking??
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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18 Jul 2006 10:18 #62904 by wireman
Replied by wireman on topic 1200 cc speed knocking??
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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18 Jul 2006 11:39 #62923 by wireman
Replied by wireman on topic 1200 cc speed knocking??
i just noticed your carb post says something like 12.25:1 which pistons do you have?:whistle:

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18 Jul 2006 23:40 #63085 by martijn
Replied by martijn on topic 1200 cc speed knocking??
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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18 Jul 2006 23:50 #63087 by wireman
Replied by wireman on topic 1200 cc speed knocking??
any damage?:S

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22 Jul 2006 01:31 #63828 by martijn
Replied by martijn on topic 1200 cc speed knocking??
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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24 Jul 2006 13:16 #64299 by martijn
Replied by martijn on topic 1200 cc speed knocking??
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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24 Jul 2006 16:28 #64344 by KawasakiJockey
Replied by KawasakiJockey on topic 1200 cc speed knocking??
How high of octane? 93 at the pump wont do.

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