Tight valve clearances.

[jaffa90]

Q, can a gsx 600f bike engine with tight valve clearances run ok above 3,000 rpm to just under the red line???????

[Riejufixing]

[Nobby the Bastard]

[jaffa90]

Yes under load, i would say that this would show up more resulting in a power loss, please correct me and one or two others on here.

[stinkwheel]

Why on earth wold you want to?

Under no load, it would probably even rev to the redline if you replaced one of the pistons with a tennis ball.
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[mentalboy]

[jaffa90]

[Riejufixing]

So it's a duplicate thread?

[ThatDippyTwat]

You're a bit of a cock-end Jaffa. Actually, a lot cock end. If you want to have a pop at me, tell me I'm wrong, say whoever told me something is wrong, cry from teh rooftops the entire world is wrong and only you are right - Have at it. Just grow a pair and tell me to my face, and stop the fucking around with this passive aggressive bullshit.

To answer your question - The bike will rev, to the redline. Under load. I warmed it up and thrashed it yesterday. I haven't checked it clearances yet.
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[MCN]

Sniff... sniff....sniff.

Can anyone else smell Flounce?
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[jaffa90]

Not getting at you T.D.T, it`s,
"""However, a few people have suggested the valve clearances may be tight"""
If a bike/engine performs at high revs but not low revs without choke, who are these few people who think it`s the valve clearances ?????

[Nobby the Bastard]

Tight valves can present as not starting without cough and spluttering for a couple of minutes when cold and running fine when hot.

It's all down to different metals expanding at different rates when hot. The head an expand more than the valves, opening up the clearances.

Fz series bikes are renowned for doing this.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
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[Easy-X]

Would I be right in saying you want the valve clearances as loose as you can to not introduce unnecessary wear under load but not so loose that you have trouble starting the thing?

I'm sure there's a double entendre that could be worked in there somehow
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[Nobby the Bastard]

You want it with sufficient clearen e that the valves close completely. You dont want them coo large because that's inefficient.

If the valves get too tight they actually end up as negative clearance (ie partially open when they should be closed) resulting in the engine grumbling instead of starting until it's got sufficiently warm as described above.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Riejufixing]

[Nobby the Bastard]

[Riejufixing]

[Nobby the Bastard]

Normally, the .15 mm on the exhaust and .10mm on the intake will be sufficient regardless of weather, but when they are at .00 at 23 degrees celsius, once you get down to close to zero that lack of gap becomes an open valve.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[ThatDippyTwat]

[Nobby the Bastard]

R6? Fz family....
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[ThatDippyTwat]

[sickpup]

[Riejufixing]

[jaffa90]

[Nobby the Bastard]

Same reason why you know they close at 10k when they aren't quite as tight.

The fucking engine runs. As soon as the gaps close so much that they aren't closed when the engine is warm, the engine wont start at all
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050