Air Venturi 4500 compressor no hp

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I've never worked on these little compressors before but I did use to build 2 stroke race engines for quads and dirt bikes back in the day. That being said, when an engine lost power and there was no leaks, spark plug was good, everything was good, the culprit was usually low compression due to worn out rings. Only way to see is to do a compression check per the manufacturers instructions.
 
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Tha fact that it gets to 2000psi albeit slowly tells you the Low pressure side is delivering volume to the High Pressure side. However, the HP side can only get to 2000 psi. While the LP side is getting hotter it tells you it's working harder but the HP side is doing nothing with it...can't get higher than 2k. I would suspect an issue with HP side piston/seals valves etc...
 
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@Keyman62421, I don't understand what "(over heating air temperature) over nite" means?
It has been my experience having worked on an Alpha Carrette and a Hatsan Lightning (both very similar pump to the Air Venturi) that if the first stage is functioning and the second stage is not that you will typically get about 300 to 400 PSI output. If the second stage is functioning but the first stage is not you will typically see around 1.5K to 2.5K PSI output. Not sure this really tracks with your component temperature data, but this has been my experience in the past so YMMV. Once you have all the panels off, coolant drained, and piping removed it is only 4 bolts to remove either cylinder head so take your choice. The Alpha Carrette that I repaired broke the first stage reed valve within a couple of hours of run time after I replaced it, so I guess I must have gotten a defective one. Replaced it again and it hasn't had that problem again. Good luck! Chip.
 
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By thanks all but I found it sending the picture with me high pressure read valve
20221028_122703.jpg
 
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cwcarrera said:
@Keyman62421, I don't understand what "(over heating air temperature) over nite" means?
It has been my experience having worked on an Alpha Carrette and a Hatsan Lightning (both very similar pump to the Air Venturi) that if the first stage is functioning and the second stage is not that you will typically get about 300 to 400 PSI output. If the second stage is functioning but the first stage is not you will typically see around 1.5K to 2.5K PSI output. Not sure this really tracks with your component temperature data, but this has been my experience in the past so YMMV. Once you have all the panels off, coolant drained, and piping removed it is only 4 bolts to remove either cylinder head so take your choice. The Alpha Carrette that I repaired broke the first stage reed valve within a couple of hours of run time after I replaced it, so I guess I must have gotten a defective one. Replaced it again and it hasn't had that problem again. Good luck! Chip.
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Typos
I need to read my posts more thoroughly before sending!,
 
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