2 stroke oil

[gdr]

I think all relates to the way you ride them .

[NR555]

Had problems with glazing with a full synth (Motul 800) on a cast iron bore (CZ).  I was losing noticeable compression towards the end of race days and we were forever honing the thing.

Maxima 927 or Castrol A747 fixed the issue.  Shell M would work too.  This all makes sense, considering full synths didn't exist back in the day!  The modern semi-castors work really well on the old bikes.  All of the benefits of castor, plus the clean running synthetic experience.

For a nicasil barrel, any good modern synth will do the job.

[oldyzman]

NR 55, thats funny you say that, my 125e has the glazed bore syndrome.
Brett

[maxi81]

Wow alot of replies here. Thanks for the info

Max

[Rossvickicampbell]

Whitey - I am with you - Silkolene Comp 2 Plus - absolutely brilliant.  Only problem I have had was went I went to Tassie for the Nats and couldn't send any oils etc over so all I could get was Motul 800 - bike smoked more than it ever had.  I find Silkolene great.

[oldskool]

Why would different oils affect different bikes in different ways.I only ask as motul works good for both my bikes but motorex and silkoline seem to make them both foul plugs. Could it be the type of fuel? as in bp shell etc.

[Rusty]

Always used to run Motul 800 in my 90's CRs but for the pre 80's vintage bikes I want a similar type oil as run back then - especially with cast bores & chrome rings.

125cc - 32:1
250cc - 40:1
500cc - 50:1


Running Belray 2T right now but going to evaluate SL-2 next.

[80-85 husky]

Some bikes do not like some oils...  beats me. i borrowed an old prolink xl250 off a mate in the early 90's and ran around on it for a month or so then decided to change the oil and give it a once over... i put new shell oil in it and within 2 weeks it had scoured the rings and was smokin like a 15:1 castor special. shagged it totally.

i could see an old CZ struggling with new synth oils but the nickasil bores like the synthetics ok.

Silkoline.. great oil. ran my old Husky (it was new then ) on 50:1 back in 1985..people freaked but it ran well and was well within service when i tore it down after a season of racing but the pro comp oil had a octane booster and it had a good kick over the std stuff. found it hard to hang on by the end of a long day in the saddle .

Summary: any good oil tts/ motul / etc at 30 - 40 :1 will be fine in all two strokes
fully synths can be safely run to 50 - 60:1 depending on your comfort level...
older castor styles 20: 1 enjoy the smell!!

does that sound right

[JohnnyO]

Had problems with glazing with a full synth (Motul 800) on a cast iron bore (CZ).  I was losing noticeable compression towards the end of race days and we were forever honing the thing.

Maxima 927 or Castrol A747 fixed the issue.  Shell M would work too.  This all makes sense, considering full synths didn't exist back in the day!  The modern semi-castors work really well on the old bikes.  All of the benefits of castor, plus the clean running synthetic experience.

For a nicasil barrel, any good modern synth will do the job.

What mixture were you running with the Motul 800? I use it in all my bikes at 40-50:1 with no problems and most of them have a cast iron bore.

[dirttracker]

motorex castor kart at 16:1

[Lozza]

motorex castor kart at 16:1

saves those big ends disintergrating at 15,000 

[shelpi]

excellent comments so what should I run in my T250/350 1967 with the oil pump? cheers

[tony27]

excellent comments so what should I run in my T250/350 1967 with the oil pump? cheers

Used to run my T500III on castrol superTT semi synthetic, pump feeds the outer main bearings & big ends via shields but can't remember if the other feed goes to the inlet port or some part of the cylinder
Seeing as you're looking at running the bike in dirt track it should be okay to adjust the pump to deliver more oil otherwise just add a small amount to your fuel. When I had the T500 I had the specs for porting etc for roadracing but don't remember what was done as with the pump

[shelpi]

excellent comments so what should I run in my T250/350 1967 with the oil pump? cheers

Used to run my T500III on castrol superTT semi synthetic, pump feeds the outer main bearings & big ends via shields but can't remember if the other feed goes to the inlet port or some part of the cylinder
Seeing as you're looking at running the bike in dirt track it should be okay to adjust the pump to deliver more oil otherwise just add a small amount to your fuel. When I had the T500 I had the specs for porting etc for roadracing but don't remember what was done as with the pump

cheers Tony 

[Tim754]

excellent comments Wink so what should I run in my T250/350 1967 with the oil pump? cheers


yep