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zx6r f3 cylinder compression

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Vase
Two Stroke Sniffer



Joined: 04 Jan 2013
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PostPosted: 09:53 - 08 Jun 2013    Post subject: zx6r f3 cylinder compression Reply with quote
having an issure with cylinder 3 backfiring!
All leads are sparking aswel as all plugs (replaced with a 2nd new set just incase)

I have managed to get hold of a digital compression tester and my readings are fairly different

Cylinder 1 = 140psi
Clyinder 2 = 124psi
Cylinder 3 = 96psi
Cylinder 4 = 110psi

Is cylinder 3 clearly having problems? as im not sure on what the tolerence would be as i cant find the specs in the haynes manual.

new engine time?

cheers
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 10:02 - 08 Jun 2013    Post subject: Reply with quote
They are low.. all really low.

96 and 110 is probably well out of spec.

Pop some oil down the bore and retry, if its increases the figures, its a rings job.
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Vase
Two Stroke Sniffer



Joined: 04 Jan 2013
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PostPosted: 10:10 - 08 Jun 2013    Post subject: Reply with quote
cheers.

Also would low compression cause backfire?
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Timmeh
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Joined: 01 Nov 2006
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PostPosted: 10:10 - 08 Jun 2013    Post subject: Reply with quote
more than likely.
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stevo as b4
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Joined: 17 Jul 2003
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PostPosted: 14:36 - 08 Jun 2013    Post subject: Reply with quote
At a guess, with such differing reading's across the board I would put my money on it being a valve seating issue. But as said do the wet compression test first to find out more.
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skatefreak
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Joined: 06 Feb 2010
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PostPosted: 11:47 - 09 Jun 2013    Post subject: Reply with quote
Just out of curiosity and not to hijack the thread but if it were to be the rings would it be economically viable to split the engine and change them yourself (rings and or pistons) or would the parts end up costing more than it would be worth?
Piston kits seem to be lots of money Shocked .

-Jvr
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J.M.
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Joined: 27 Mar 2011
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PostPosted: 12:49 - 09 Jun 2013    Post subject: Reply with quote
skatefreak wrote:
Just out of curiosity and not to hijack the thread but if it were to be the rings would it be economically viable to split the engine and change them yourself (rings and or pistons) or would the parts end up costing more than it would be worth?
Piston kits seem to be lots of money Shocked .

-Jvr


Depends on what price you can get a new engine/bike at.

You should factor in £100-150 in gaskets plus around £40 each ring set; not including any reboring that may be needed. You should also factor in tools such as a valve spring compressor and tools for reseating the valves.

I'm going to rebuild the top end on my XJ600 because I think the valve stem seals need replacing and the base gasket, but I said to myself that if the rings needed doing I would just write the engine off instead.
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J.M.
World Chat Champion



Joined: 27 Mar 2011
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PostPosted: 15:05 - 09 Jun 2013    Post subject: Reply with quote
Was £45 per on the GS500 too! Though that's Wemoto.

I think I'm going to buy bikes in the future based on engine component prices... Laughing
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kartl
Derestricted Danger



Joined: 14 May 2013
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PostPosted: 00:02 - 10 Jun 2013    Post subject: Reply with quote
Seems like it need piston ring replacement, 3 and 4 are quite low. Is would be best to get oem parts in replacement of these parts.
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skatefreak
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Joined: 06 Feb 2010
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PostPosted: 09:30 - 10 Jun 2013    Post subject: Reply with quote
Recap:

##Paddy## wrote:
They are low.. all really low.

96 and 110 is probably well out of spec.

Pop some oil down the bore and retry, if it increases the figures, its a rings job else you're looking at the valves.

Fixed that for you.
THIS /\
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Old Thread Alert!

The last post was made 12 years, 223 days ago. Instead of replying here, would creating a new thread be more useful?
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