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6 Posts
Hi,
Recently I dynoed my 05 GSXR 600 (5000km on the clock). No mods except TRE. The results came out rather low:
The A/F ratio is very rich
I thought something might be not right, hence did some checking.
1. Compression pressure test
It failed the service manual's minimum (128psi). I got 127.5psi for all cyclinders.
I have tested the pressure gauge against my dad's CBR1100XX and the result was higher (147.5psi).
This is most puzzling as GSXR have 12.5 compression ratio and the CBR has 11.
2. Leak down test
The result is excellent. 3% leak for all cyclinders.
I'm just wondering if you guys have any opinion on this? Do you think the valve timing or the valve clearance is out?
Thanks
Recently I dynoed my 05 GSXR 600 (5000km on the clock). No mods except TRE. The results came out rather low:

The A/F ratio is very rich
I thought something might be not right, hence did some checking.
1. Compression pressure test
It failed the service manual's minimum (128psi). I got 127.5psi for all cyclinders.
I have tested the pressure gauge against my dad's CBR1100XX and the result was higher (147.5psi).
This is most puzzling as GSXR have 12.5 compression ratio and the CBR has 11.
2. Leak down test
The result is excellent. 3% leak for all cyclinders.
I'm just wondering if you guys have any opinion on this? Do you think the valve timing or the valve clearance is out?
Thanks