Power loss F4 1000s - MVAgusta.net
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post #1 of 5 (permalink) Old 04-20-2019, 09:38 AM Thread Starter
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Power loss F4 1000s

After a time without riding, i went to ride. I have a power loss in high RPM (above 9k). More noticeable in 4/5/6 Gear. Its sames an old 600. At first thought on bad fuel. I changed all for fresh. Power loss continued. I checked Fuel connections (i did have time ago problem with this.) Connectors are ok. (CRC ones).
I connected a pressure gauge and pump gets +4kgs when priming and there is no noticiable pressure lost in 30 seconds or so. Then goes to 2.5kgs and stand there. I did not test gauge riding. What i hear its a different pump noise (not always). I put link. https://youtu.be/U7n1q8lgqJI
Bike idles perfect. No stall.
Could it be that pump generates pressure, but then with load there is low flow?
Sparks are new. Air filter too.
Next week i Will buy a Mahle filter (its has 5000km) and a pump.
Must i check anything else for the power loss? Thanks
Kind regards
Fernando
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post #2 of 5 (permalink) Old 04-20-2019, 09:44 AM Thread Starter
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Edit not 4kgs if not, 3kgs
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post #3 of 5 (permalink) Old 04-20-2019, 10:17 AM
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I suspect it is your fuel filter.... restricting fuel flow over time. Very common problem in the USA with ethanol gas degradation when a bike is not ridden for a period of time.
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post #4 of 5 (permalink) Old 04-20-2019, 01:21 PM
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Fernando;
Just change the fuel filter.....
Fuel pressure should be 3 bar or 43.5 psi

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post #5 of 5 (permalink) Old 04-21-2019, 08:39 AM Thread Starter
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Thanks guys. Problem solved. I changed just the filter, and power returned. You help me a lot.
Regards
Fernando
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