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Meds wrote:Once again I’ve had gumming up on worn rings.
I noticed a slight loss of power and it was a bit harder to start.
Top ring found stuck and both rings worn.
The cylinder was ok - new rings fitted and much better starting and a lot crisper.
I’m not blaming Exol- but I need to keep watch out for the symptoms of ring wear.
So far I’ve noticed that on a normal cylinder starting becomes a bit harder to start, drop off in power and the Tick-over starts to go.
On a my reed cylinder it backfires on starting, it’s a bit harder to start, drop off in torque and tick over.
Both my scooters are set on the rich side and the 4 stroking as the the throttle is rolled off is a bit less.
If there are others or I’m way off it would be worth knowing.
Meds wrote:I use exoil fully synth in a rapido and an RT at 3% ish
I rev them a bit and not had a problem in 3 years.
dscscotty wrote:I regularly split crankshafts that have run exol and other oils @ 2 and 3%, my view and the evidence I see on big end bearings is run 4%, all the focus is on cylinder/piston , however under lubed big ends are a regular occurrence and the signs of over heating are quite evident
dscscotty wrote:I regularly split crankshafts that have run exol and other oils @ 2 and 3%, my view and the evidence I see on big end bearings is run 4%, all the focus is on cylinder/piston , however under lubed big ends are a regular occurrence and the signs of over heating are quite evident
Hat wrote:What about the argument that running too high a mix of oil makes the engine run hotter, increasing the risk of heat seizure? Is there any truth in this?
+burnside wrote:Hat wrote:What about the argument that running too high a mix of oil makes the engine run hotter, increasing the risk of heat seizure? Is there any truth in this?
It's logical that if you increase the oil %age then you are lowering the fuel %age so you are risking running lean if you carb is jetted right on the limit.
Warkton Tornado No.1 wrote:+burnside wrote:Hat wrote:What about the argument that running too high a mix of oil makes the engine run hotter, increasing the risk of heat seizure? Is there any truth in this?
It's logical that if you increase the oil %age then you are lowering the fuel %age so you are risking running lean if you carb is jetted right on the limit.
Wise words, but just try & stop many Lambretta fiddlers adding more oil whilst running in! The same type plod along, regardless of the fact that more revs means more fan cooling! The engine would be better off if they simply caned it!
dscscotty wrote:I regularly split crankshafts that have run exol and other oils @ 2 and 3%, my view and the evidence I see on big end bearings is run 4%, all the focus is on cylinder/piston , however under lubed big ends are a regular occurrence and the signs of over heating are quite evident
dscscotty wrote:Soon as I get time I'll post up some pics of bearings, rods n crank pins
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