That is the usage for my Series C Comet over the last 1200 miles.
Only engine mods since the 60s (when the bike was last run) is steel idlers, locking feed bolts and changed some oil lines. Changed the oil and filter and made sure oil flowed from quill to sump etc, but no strip down and deep clean. I'm using Castrol GP50.
The exhaust is extremely oily with black oil and just recently started to smoke a lot.
About 100ml (4oz) of oil per 100 miles migrates to primary case
I have tried with and without metering wires, they are currently in. A lot of oil in the rocker tunnels, more in the exhaust side .
It currently has oil restriction disk on cylinder feed.
In the 60s the oil return was modified to T off to go both direct to tank and off to the exhaust then inlet feed. I've tried with this and the original Vincent layout.
Spark plug looks on the dirtier side of ok but not covered in oil or soot (NGK BP6ES currently)
125psi compression, ~10% leak down from the rings as far as I can tell (piston at bottom)
I used some Seafoam about 200 miles ago and this increased the compression from ~110psi but it's probably since then it's started smoking. Smokes a lot once hot and at idle - it didn't smoke much at all 1200 miles ago (exhaust system was clean and new).
Checked breather timing, can't see oil dripping from there. There are a few minor weeps here and there but nothing to cause much loss. Most seems to be in the exhaust and then primary.
Other than that, it seems to run great, idles nice and does 70-75mph on the flat, 80 down an incline.
Would I be justified stripping the engine to look inside?
What do all these symptoms suggest is wrong, one thing or everything?
Lee
Only engine mods since the 60s (when the bike was last run) is steel idlers, locking feed bolts and changed some oil lines. Changed the oil and filter and made sure oil flowed from quill to sump etc, but no strip down and deep clean. I'm using Castrol GP50.
The exhaust is extremely oily with black oil and just recently started to smoke a lot.
About 100ml (4oz) of oil per 100 miles migrates to primary case
I have tried with and without metering wires, they are currently in. A lot of oil in the rocker tunnels, more in the exhaust side .
It currently has oil restriction disk on cylinder feed.
In the 60s the oil return was modified to T off to go both direct to tank and off to the exhaust then inlet feed. I've tried with this and the original Vincent layout.
Spark plug looks on the dirtier side of ok but not covered in oil or soot (NGK BP6ES currently)
125psi compression, ~10% leak down from the rings as far as I can tell (piston at bottom)
I used some Seafoam about 200 miles ago and this increased the compression from ~110psi but it's probably since then it's started smoking. Smokes a lot once hot and at idle - it didn't smoke much at all 1200 miles ago (exhaust system was clean and new).
Checked breather timing, can't see oil dripping from there. There are a few minor weeps here and there but nothing to cause much loss. Most seems to be in the exhaust and then primary.
Other than that, it seems to run great, idles nice and does 70-75mph on the flat, 80 down an incline.
Would I be justified stripping the engine to look inside?
What do all these symptoms suggest is wrong, one thing or everything?
Lee