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Discussion Starter #1 (Edited)
:: apologies for the misspelling of crank - Im using a 40inch tv and sat 6ft away, and Im educationally retarded ::

Good evening one and all,

Well I would like to explain the minor issue I seem to be having with my 11 plate.

It has a LeoVince SBK decat/end pipe and a K&N (no Power commander)

I use it for my commuter so it get the brunt of the good and horrendous weather - I spend most of my life between 2/3 gear and at about 2-4krpm (approx 30/40mph).

I have noticed it judders like a jack hammer, and rides like a twin (so much engine braking!!) - which isnt the worst of it, it seem like every week I have to pop the covers off and empty the crankcase breather as it fills up with oil, today the bike totally died filtering traffic doing about 40 after a cough a splutter and a final fart. but fired up perfectly and was running fine again. Now I've cleared out the breather It hasnt missed a beat and runs beautifully!

So my questions:

1) Why would the crank case be over pressurising so much it fills up the little plastic tube thing after ~100miles? (excuse my technical terms)
2) Do you think in your opinions the fact the fuelling is out as it has no power commander over pressurising the crank, or could the pressurisation be affecting the fuelling?! (or is it a loop of both)


As always I appreciate your comments and advice please feel free to throw what ever ideas you have out there!

Thanks Guys,

Dave.:thumbup
 

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I have leo Vince decated and no power commander ,standard air filter and it has been running fine from 2009.
 

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Crank case pressure is generated by blow past of the piston rings from the combustion chambers.

Maybe your piston rings are getting past their best.---:notme
 

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Dave, sorry lad, but I don't think this sounds like a "minor issue". The problems you're describing should simply not be happening on a properly functioning engine.

As to the underlying cause, other posters have identified the likely sources. There's an easy way to check 'blow-by': simply run the engine with the oil filler cap off. Normally there is a small amount of 'pumping' of air out of the cap; about like blowing on your hand medium-hard. And it should be very easy to screw the filler cap back in place, while the engine is still running. If the crankcase is pumping 'hard', there'll be a BIG stream of air, and the pressure will make it difficult to replace the cap ( I experienced this with my previous SV650, when there was a lot of blow-by when the rear cylinder valves were failing).

Good luck!
 

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An overfilled crankcase would do all of that. Are you sure the oil level is ok? Are you checking the oil on the sidestand?
 

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Discussion Starter #8
Hi all,

Thank you so much for you replies,

I have checked the engine oil and it's on the lowest line (I also assumed it could be too much oil)

Good suggestion about the filler cap though that's next, I'm hoping there is an airlock or something cheap.

My next steps will be to drop the oil and change the filter for a new standard filter, replace with castrol 10-30 as per the manual. I am hoping the filter is blocked or something!

The bike itself has only done 5k miles, do you think the rings could be going sounds like it's going to be expensive! Or it not a milage thing but a wear thing?

As always thanks so much for your ideas and suggestions!

Cheers,

Dave
 

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At that mileage a fault sounds much more likely.

Can we assume that somebody hasn't removed or blocked the wrong pipes when fitting the after market bits?

Check the breather from the rocker cover.

My comment on the running in refers to what is known as glazed bores this could be the answer but I would exhaust the other possibilities first.
 

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wow....5k and an 11 plate..... do what the more experienced spanner guys say then if no luck get it into someone who knows what the hell is going on !
 

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Discussion Starter #11
Evening all,

OK so I removed the oil filler cap let it run and kept checking the oil level in the process.

There was a gentle blow from the bottom end which was as previously said would happen - no suction which is good!

Now I seem to have gained oil.. I assume it was an air bubble somewhere and it made it look empty but on level ground it's 5/6ths between top and bottom lines.

Touch wood it seems to have corrected the problems.. I'm hoping, the little plastic tube seems clear now.

Is 5k alot for a 11 plate? It's slightly under like 4700 odd,

Again thank you all for your suggestions I hope I don't have to post in here again! :)

Cheers,

D
 

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Nope, 5k for a 4 year old bike is not a lot which is why i was surprised at the issues you were having, good luck with it and i hope this has solved it.
 

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You never did say how you are checking the oil.

At the risk of insulting your mechanical knowledge....

Oil Level Check Procedure
1. Warm the engine.
2. Shut it off.
3. Wait 2 minutes.
4. Stand the bike upright, it CANNOT be on the sidestand when checking oil level.
5. Look at the sight glass and make sure the oil level is somewhere between the two lines. The upper line is the full mark, the lower line is the add mark.
 

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Discussion Starter #14
Hudson not a problem just curious if there has been known problems with the age etc, always hard to tell context over messages but always welcome any comments,

Deluth no insult taken what so ever! I've known of people talking about different ways of doing simple tasks and yet they vary so at least we are all on the same page, I didn't let it settle for two mins in all fairness! So tomorrow I will have another go and update!

Breather pipe is coming off tomorrow as well! Check that properly! Also may put the bike back to standard (pipe, decat and filter)

I'll update results, cheers guys much appreciated! :)
 

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No problem, i can simply not imagine a bike of 4 years old with such low miles having issues like this, i have come accross the old Honda Blackbirds who are no knocking on 20 years old, some with 200,000 miles and still going !!! 5k..... and 4 years ! If there were any know issues with these Honda engines having just covering those miles then i would be REALLY worried for Honda's future sales.
 

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Discussion Starter #16
afternoon guys,

I can totally agree with you Hudson, i know i read somewhere they split a CBR6 engine after covering 200k miles and it was like brand new inside! Honda dont make crap, slightly outdated yes - crap no! :)

Ok so I have been mega busy today;

1)put exhaust,cat and filter back to standard (soo quiet)
2) reset ECU
3) stipped the bike down and inspected all the breathers;
a) the crackcase breather was full of water and milky watery gunk (oil + water) so that got a full cleaning and dry out.
4)charged the battery
5)checked the oil as per Deluths instructions

It rides totally different, i wouldnt recommend changing so much at one go as i wont know whats made the difference but if its standard and had a decent cleaning and service it will be easier to diagnose future issues.

The breather drain is now clear and has been for a week or so, I will update if i have any more problems, I can only assume the breather was blocked causing the bike to choke and splutter oil, also potential air pocket in the oil window could have made it look like no oil was in the bike when really it was potentially 6/8th full on the glass.

Either way thank you all for your help and suggestions on this! It gave me more options and potential problem areas to look into!

Many thanks,

Dave.
 

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Glad you got it sorted. :thumbup
 

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Discussion Starter #19
OK so the problem has reared it's ugly head again, it's now running incredibly rough and appears to be filling up the breather pipe not with oil as I originally suspected but condensation. It looks like a beer type colour and has a watery consistency.

I have to now empty the little plastic tube on a daily basis and pull the crankcase breather pipe off the head to let it drain a few teaspoons worth of condensation.

I'm not loosing any coolant! That's the weird thing - it's going to dobles soon and they can do their expert bit!

Updates as and when it's cured. Sad face.
 

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I think given what you have already seen and done its time for it to '' go in '' and see if the ' experts ' can sort it out. Good luck and let us know the outcome.
 
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