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| short1uk |
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 short1uk World Chat Champion

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| bish777 |
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 bish777 World Chat Champion

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| .Chris. |
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 .Chris. World Chat Champion

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| Kickstart |
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 Kickstart The Oracle

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| short1uk |
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 short1uk World Chat Champion

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| Kickstart |
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 Kickstart The Oracle

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| short1uk |
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 short1uk World Chat Champion

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| TUG |
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 TUG World Chat Champion
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 Posted: 17:07 - 09 Sep 2007 Post subject: |
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i vote runnins lean as mine is and is making a pinking sound.
 ____________________ Haz ER-5, innit! |
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| short1uk |
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 short1uk World Chat Champion

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| TUG |
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 TUG World Chat Champion
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| bish777 |
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 bish777 World Chat Champion

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| short1uk |
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 short1uk World Chat Champion

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| bugsy46 |
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 bugsy46 Village Idiot

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| short1uk |
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 short1uk World Chat Champion

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| brianmcewan.co.uk |
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 brianmcewan.co.uk Brolly Dolly

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 Posted: 00:13 - 27 Sep 2007 Post subject: |
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Out of interest, what the feck is pinking?  ____________________ Kawasaki Z1000 '05
Honda Fireblade 954 '03 |
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| stinkwheel |
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 stinkwheel Bovine Proctologist

Joined: 12 Jul 2004 Karma :    
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 Posted: 02:04 - 27 Sep 2007 Post subject: |
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| Bazza_RS125 wrote: | Out of interest, what the feck is pinking?  |
It's when the fuel in the engine explodes too early. Normally you set the spark so the fuel is ignited slightly before the piston goes over top dead centre so the piston is forced down through the entire power stroke.
Pinking occurrs when this happens too early (too far before top dead centre), either because the ignition timing is wrong, the fuel burns too quickly or the fuel is too highly compressed. This tries to force the piston back down the way it came and makes a noise called 'pinking' because that's what it sounds like. It is also known as predetonation and knocks hell out of the bearings and the piston. Can lead to a piston looking like this or much worse:
https://i48.photobucket.com/albums/f216/stinkwheel/piston.jpg
That's one out of my Jawa 350 when the timing slipped.
So common causes are maladjusted timing or using fuel with too low an octane rating for the state of tune of the engine. If you significantly tune an engine, one of the things you usually do is increase the compression, this makes the fuel tend to explode more quickly. To compensate you need to either adjust the timing (which kind of defeats the purpose by loosing all the power you just gained) or use a higher octane fuel which burns more slowly (which is the correct solution).
Putting crappy fuel in a highly tuned engine can cause pinking under high load. Most standard engines are set up to run on crappy fuel though (ie, unleaded). It used to be more common when you could still buy 2 and 3 star petrol, people would try to economise and put it in their bike then wonder why it ran like a bag of shite ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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| veeeffarr |
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 veeeffarr Super Spammer
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| short1uk |
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 short1uk World Chat Champion

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| prawny1 |
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 prawny1 World Chat Champion

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| short1uk |
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 short1uk World Chat Champion

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| veeeffarr |
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 veeeffarr Super Spammer
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Old Thread Alert!
The last post was made 18 years, 326 days ago. Instead of replying here, would creating a new thread be more useful? |
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