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sticky oil in cylinder/head

PostPosted: Fri Aug 10, 2018 3:51 pm
by lam1962brettagg
li150 s3 having seizures/noise. Recently taken head and cylinder off to find very sticky oil deposit in cylinder head especially. never known this with two stroke oil before is this normal with semi-synthetic. Just changed from the old red cheap nasty 2-stroke oil which I have always used for years to Castrol 2T for scooters.

Re: sticky oil in cylinder/head

PostPosted: Fri Aug 10, 2018 4:16 pm
by St George
Too much 2 stroke oil ? Is it firing ok, try premium petrol and a new plug; could be a weak spark.

Re: sticky oil in cylinder/head

PostPosted: Fri Aug 10, 2018 4:34 pm
by lam1962brettagg
Thanks for reply St George.
4% as ive always used.
spark seems strong.
Runs fine but starts making a noise after 3to4 miles as if it's going to sieze. I've just taken head and piston out and does have scores on piston. Very fine hairline scratches on piston as well.
Just still want to know whether semi-synthetic oil can be sticky in the head /small end bearing etc. I'm concerned it's coming from gearbox

Re: sticky oil in cylinder/head

PostPosted: Fri Aug 10, 2018 8:29 pm
by dscscotty
We've been having similar symptoms in the Teesside area with several, high mileage, generally reliable motors seizing. scuffing or holing of pistons,the four motors I have looked at all had similar oily coating which had become quite sticky, quite similar to gear box oil. None of the engines had drive seal failures, all ran different two stroke/ratio's etc. We fear that the issue is being caused by high ethanol/additive content in fuel and some sort of reaction/separation. Its not just affecting Lambretta's there's been issues with standard px125/P200's and auto's. :cry:

Re: sticky oil in cylinder/head

PostPosted: Fri Aug 10, 2018 8:52 pm
by Scooterdude
lam1962brettagg wrote:li150 s3 having seizures/noise. Recently taken head and cylinder off to find very sticky oil deposit in cylinder head especially. never known this with two stroke oil before is this normal with semi-synthetic. Just changed from the old red cheap nasty 2-stroke oil which I have always used for years to Castrol 2T for scooters.

Can you not switch back to your old oil once you put it all back together and see how it goes for a while?

Re: sticky oil in cylinder/head

PostPosted: Sat Aug 11, 2018 8:20 am
by lam1962brettagg
thanks to all for your posts and info. especially scotty re similar probs.
will change my fuel/garage and oil see if that makes a difference.
after the engines rebuilt yet again!! :(

Re: sticky oil in cylinder/head

PostPosted: Sat Aug 11, 2018 8:39 am
by dscscotty
I've sent you a PM,

Regards-Scotty-DSC

Re: sticky oil in cylinder/head

PostPosted: Sat Aug 11, 2018 10:53 am
by daniel whiteley
Try some of this aswell

https://www.dipetane.com/

Re: sticky oil in cylinder/head

PostPosted: Sat Aug 11, 2018 1:05 pm
by lam1962brettagg
thanks for the link. will look into it.
cheers