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Warkton Tornado No.1 wrote:This debate could run & run with every Barrie, Gary, Harry & Larry chipping in as above......![]()
However, to qualify my own experiences of using Exol Optima @ 2% in various tuned engines ranging from Rapido to TS1's, all with good/rebuilt cranks & well filtered air to the carburettor there has not been an issue.
From what I have seen & read in this debate, I would be extremely cautious in using the same mix in an RB kitted engine, though my automatic preference is to try & filter the intake air, though I realise the potential problems in ensuring that.
There are two stroke oils that I would not use, & others that I would. I would even go as far as saying that there can be marked differences between oils stated as air cooled specific & others that may be "all rounders" but that is only a measure of my caution.
At this point in time, from my own experiences & involvement with quite a few engines, I cannot 'rubbish' Exol Optima in conjunction with a good Super Unleaded, preferably with adequately filtered air. With tuned engines, other than RB's of which I have no hands on experience, it has been successfully used @ 50:1.
Kev Fox wrote:The only issue I have had with the Exol Optima Racing is gummed up rings a couple of times. I put this down to not pushing the scoot to its full potential as you would a race scoot. I do some long faster rides but also some around town stuff too. Had thought of switching to Exol semi synthetic but unsure now. The internet can be a great source of information but equally confusing with so many products and differing points of view.
Scooterdude wrote:I’ve just started using Exol fully synthetic at 4% as a sort of experiment really more than anything else, my thinking is most people seem to run this oil at 3 or even 2% and complain about ring sticking.
Judging by the pictures above 3 or 2% is clearly not enough oil and apart from the excessive wear obviously there will be a lot more heat generated, so I’m wondering could this excessive heat be over cooking the oil to the point of turning it into a thick tar like substance hence the ring sticking and blocked ports etc? is that plausible, I’ve no idea.
One thing I have noticed though with this Exol oil is the same as one of the above posters has remarked and that is the engine seems to have a very harsh edge to it all of a sudden, something it didn’t do when running on Groundsman.
MickYork wrote:When running my first Avanti i used the SIP fully synthetic @ 4:1. As i was running it in i didn't give it too much throttle. Near the end of my running in i lost compression. A strip down found gummed up rings.
I now run Exol at 2:1 (5+ years) and haven't had an issue.
My main mileage is long runs on motorways and the like.
I would suggest fully synthetic is not suitable for low revving and steady running. Fully synthetic is more suitable for high revving and when the engine is under more strain.
It may be that Exol is not as tolerant to low revving as some other fully synthetics ?
RT225.gaz_powell wrote:What cylinder was this in ?
My gumming was on an iron barrel, my nicosil ones have been fine
Rich Oswald wrote:MickYork wrote:When running my first Avanti i used the SIP fully synthetic @ 4:1. As i was running it in i didn't give it too much throttle. Near the end of my running in i lost compression. A strip down found gummed up rings.
I now run Exol at 2:1 (5+ years) and haven't had an issue.
My main mileage is long runs on motorways and the like.
I would suggest fully synthetic is not suitable for low revving and steady running. Fully synthetic is more suitable for high revving and when the engine is under more strain.
It may be that Exol is not as tolerant to low revving as some other fully synthetics ?
Do you mean 4% and 2% rathrr than 4:1 and 2:1 as that's rather a lot of oil?
Rich'
ToBoldlyGo wrote:I'm running this at the moment, and done a few miles on it.
https://www.zoro.co.uk/shop/lubricants- ... 730a18050b
I can't remember how I came across this, but I don't mind giving these things a try. I'm happy to report that my engines seem to go well on it.
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