While we were working on a local expert rider's RMZ450 I took some pictures I thought were worth sharing.
The RMZ450 exhaust cam below has less than 20 hours on it :
http://www.ericgorr.com/images/drn/rmz450_exh_lobe_1.jpg
http://www.ericgorr.com/images/drn/rmz450_exh_lobe_1b.jpg
http://www.ericgorr.com/images/drn/rmz450_exh_lobe_2a.jpg
http://www.ericgorr.com/images/drn/rmz450_exh_lobe_closing side.jpg
The RMZ's intake cam looked almost exactly the same, but oddly enough the intake valves were in fairly decent shape. The rings and piston were completely shagged. It smoked like a two-stroke when it came in.
As a comparison, the CRF 450 cam below has 2 seasons on it :
http://www.ericgorr.com/images/drn/HondaCRF450_03_2_seasons on cam.jpg
Forensic work on engines sure is interesting. ;)
All pictures are of the closing ramp side of the cams.
The RMZ450 exhaust cam below has less than 20 hours on it :
http://www.ericgorr.com/images/drn/rmz450_exh_lobe_1.jpg
http://www.ericgorr.com/images/drn/rmz450_exh_lobe_1b.jpg
http://www.ericgorr.com/images/drn/rmz450_exh_lobe_2a.jpg
http://www.ericgorr.com/images/drn/rmz450_exh_lobe_closing side.jpg
The RMZ's intake cam looked almost exactly the same, but oddly enough the intake valves were in fairly decent shape. The rings and piston were completely shagged. It smoked like a two-stroke when it came in.
As a comparison, the CRF 450 cam below has 2 seasons on it :
http://www.ericgorr.com/images/drn/HondaCRF450_03_2_seasons on cam.jpg
Forensic work on engines sure is interesting. ;)
All pictures are of the closing ramp side of the cams.