Komprimierung testen

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baldock
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Komprimierung testen

Beitrag von baldock »

weiß jemand, wie man die Kompression auf einem XL500R richtig testet?

Welche Lektüre sollte ich bekommen?
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Gunnar_HH
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Re: Komprimierung testen

Beitrag von Gunnar_HH »

No, it is difficult to measure. Warm engine, full throttle, kick hard without auto decompression.

Compression ratio is not measured compression!
When compressing by kicking, the temperature increases and the measured value should be higher.
The compression ratio of the XL500 engines is 8.6 to 1 with normal pistons.

A good measured compression should be above 10.
Below 8 I would worry about what is wrong with the piston, cylinder or piston rings.
If you have a high compression piston (with dome), then the combustion chamber must be measured. And the compression ratio must be recalculated. The measured compression is then also significantly higher. Better petrol is needed (100 octane).

Maybe Hiha can help.

Best regards
Gunnar
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baldock
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Re: Komprimierung testen

Beitrag von baldock »

Thanks Gunnar.

I haven't had a chance to do any more on my bike as very busy at the moment.

However, I had a concern after reading a recent post where others members talked of how hard there bikes were to kick over.

Mine is quite easy, yet it has a new rebore and new genuine Honda piston and rings.

I would have thought mine would have been like everyone else or even harder to kickstart.

So if I buy a compression tester, they read in either PSI or BAR. Is the 8/10 you mention BAR???
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hiha
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Re: Komprimierung testen

Beitrag von hiha »

So I'm not shure how "other members" kick their XL, but if they have to kick against compression, I fear they are kicking the wrong way. :lol:
Anyway: With a tester you measure the pressure which occurs while kicking. Not more and not less. So it doesn't matter if it's bar or psi.
My 2cent: I never measure compression on a single. If the kick-lever comes down slow, everything is alright.
More information gives a "druckverlusttest" , where you give airpressure to the combustion chamber via a spark plug adapter. You can measure how fast pressure gets lost, and you can listen WHERE it gets lost.
Cheers,
Hans
baldock
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Re: Komprimierung testen

Beitrag von baldock »

thanks hiha.
As usual, nothing is ever straight forwards.
I assumed it would have been as simple as buying the tester, kicking the bike over and hopefully having a reading that proved my bike was fine.
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