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sticky oil in cylinder/head

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

sticky oil in cylinder/head

Postby lam1962brettagg » Fri Aug 10, 2018 3:51 pm

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.
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Re: sticky oil in cylinder/head

Postby St George » Fri Aug 10, 2018 4:16 pm

Too much 2 stroke oil ? Is it firing ok, try premium petrol and a new plug; could be a weak spark.
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Re: sticky oil in cylinder/head

Postby lam1962brettagg » Fri Aug 10, 2018 4:34 pm

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
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Re: sticky oil in cylinder/head

Postby dscscotty » Fri Aug 10, 2018 8:29 pm

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:
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Re: sticky oil in cylinder/head

Postby Scooterdude » Fri Aug 10, 2018 8:52 pm

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?
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Re: sticky oil in cylinder/head

Postby lam1962brettagg » Sat Aug 11, 2018 8:20 am

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!! :(
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Re: sticky oil in cylinder/head

Postby dscscotty » Sat Aug 11, 2018 8:39 am

I've sent you a PM,

Regards-Scotty-DSC
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Re: sticky oil in cylinder/head

Postby daniel whiteley » Sat Aug 11, 2018 10:53 am

Try some of this aswell

https://www.dipetane.com/
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Re: sticky oil in cylinder/head

Postby lam1962brettagg » Sat Aug 11, 2018 1:05 pm

thanks for the link. will look into it.
cheers
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