First off, I'm new to the site and this is my first post
I've got 3 Quantums, one 1995 4hp, a 2011 675 series, and a 2004 6.5hp
The 675 is hardly used. Factory fill changed at about 4 hours to Mobil Special 30w. It smokes for a second on hot restart if it's sat for a few minutes, but never on cold start or if its started within say 5 minutes of shutoff. Kind of lacks power also. the smoking started after just a couple hours of use, but the lack of power has been there since day 1
The 4hp is of unknown hours, I recently acquired it from an older guy in the neighborhood. I saw it sitting by his shed and asked about it, because I recognized it as the same mower my mom had when I was little.
It runs good, starts right up and runs smooth. It smokes briefly on cold starts and has a bit of a clatter to it at steady RPM, more of a knock when throttling up from idle. I've had several quantums that made this noise in the past that never got any worse.
I did pull the head off to inspect, because of the nice cloud of blue it gives on cold starts. It's amazingly clean given it's age, the cylinder looks good except one line. About 1/8" wide the whole length of the cylinder is a nice gouge. but it's not a solid line, it's pitted. smooth with the rest of the cylinder between pits. What's with that?
I've changed the oil in it a few times, it was nasty and black when I got it.
first change was Mobil Special 30w, which was black after about 15 minutes of running. changed again twice with Rotella t5 10w30, and then filled with Royal purple 10w30, it's what I had sitting in the shed. which still, got a little dirty soon after being put in. The engine has a good deal of muck built up in it.
The 6.5hp, I just rebuilt, doesn't smoke or clatter. Filled with 10w30 Royal Purple, to finish off what I had left sitting in the shed.
I guess my question is, what should I be running in these? And could anybody explain the 4hp's pitted line in the cylinder? or the 675 series lack of power and smoke on hot restarts with hardly any use
I've got 3 Quantums, one 1995 4hp, a 2011 675 series, and a 2004 6.5hp
The 675 is hardly used. Factory fill changed at about 4 hours to Mobil Special 30w. It smokes for a second on hot restart if it's sat for a few minutes, but never on cold start or if its started within say 5 minutes of shutoff. Kind of lacks power also. the smoking started after just a couple hours of use, but the lack of power has been there since day 1
The 4hp is of unknown hours, I recently acquired it from an older guy in the neighborhood. I saw it sitting by his shed and asked about it, because I recognized it as the same mower my mom had when I was little.
It runs good, starts right up and runs smooth. It smokes briefly on cold starts and has a bit of a clatter to it at steady RPM, more of a knock when throttling up from idle. I've had several quantums that made this noise in the past that never got any worse.
I did pull the head off to inspect, because of the nice cloud of blue it gives on cold starts. It's amazingly clean given it's age, the cylinder looks good except one line. About 1/8" wide the whole length of the cylinder is a nice gouge. but it's not a solid line, it's pitted. smooth with the rest of the cylinder between pits. What's with that?
I've changed the oil in it a few times, it was nasty and black when I got it.
first change was Mobil Special 30w, which was black after about 15 minutes of running. changed again twice with Rotella t5 10w30, and then filled with Royal purple 10w30, it's what I had sitting in the shed. which still, got a little dirty soon after being put in. The engine has a good deal of muck built up in it.
The 6.5hp, I just rebuilt, doesn't smoke or clatter. Filled with 10w30 Royal Purple, to finish off what I had left sitting in the shed.
I guess my question is, what should I be running in these? And could anybody explain the 4hp's pitted line in the cylinder? or the 675 series lack of power and smoke on hot restarts with hardly any use
