2 strokes

I've no idea. Any decent websites along the lines of "so you've been
riding for years, are a mechanical numpty, but have gone and bought a
racing 2-stroke" advise?

on here:

http://www.rgv250.co.uk/tipsandservice.htm

it says not to mix two different types of 2-stroke oil. Why not?

And if it's true, does Paul Carmichael know what sort of oil is
already in it?

Also, how many kicks should it take to start - it takes about 5-6 - is
that typical?

Also, do I really need to warm it up for 5 minutes gently blipping the
throttle before riding it?

 

Dunno, but what I did when I put fresh oil of a different type in the DT
was to make sure that most of it was out, except that at the very bottom
of the reservoir (in the pipe) before putting the new stuff in.

Only being able to speak for the DT, it was usually first try, or up to 3
if it was a cold day.

I wouldn't have thought you'd need to do it for that long.

 

with all due respect, I think an RGV250 punting out ~60bhp at the rear
wheel is in a slightly higher state of tune than a DT125.

 

darsy says...

If they mean Castrol R and 'normal'[1] 2 stroke then mixing the two will
turn it into a claggy glue like stuff and the engine will seize faster
than.... Well a race tuned 250 2 stroke. Use a good synthetic oil like
Castrol TTS or GP.

Sounds about right. I'll probably drop as you learn the knack'

Yes, tuned 2 strokes will seize at the drop of a hat and running them
hard when cold is a real engine killer

[1] Mineral based

 

Synthetic and mineral don't mix, don't know why, I've always used semi
synth.

 

Well, without running it dry (which I wouldn't recommend at all obviously)
there's going to be no way of getting every last bit of oil out of the
pipe. It's not going to mix much in the tiny bit inside the pipe.
Then again, I suppose it doesn't make any difference if you've not got a
reservoir, but are using premixed.

 

Some of them don't diffuse into each other, either. When I drained the
reservoir on the DT before changing it over, I put a few drops of the new
oil in a bit of the old oil that I had in a jar, it just sank to the
bottom like when you try to mix various oils and water.

 

no, there is a (fucking huge) reservoir under the seat.

Apparently the oil I'm supposed to use is like 10 quid a litre - it's
no fucking wonder they don't make these things any more.

 

no, they say you've got to use top quality fully synth oil, but you
shouldn't mix two different brands - I don't get this.

I hope so - it's a cuntish little kick-start and no mistake.

Okie-doke - it's not like it'll ever need starting outside my house
early in the morning or anything.

can you still get the strawberry-scented 2-stroke oil?

 

Some bikes use surprisingly little, obviously you're going to be doing a
billion more revs than the DT would, but I think I only used about half a
litre in a thousand miles.

 

I think it really means "type", rtaher than make i.e. don't mix
synthetic and non-synthetic. Paul's almost certainly used synthetic
in there, so you should be OK. Always use top quality sythetic oil in
a modern highly tuned stroker

Doesn't sound to bad, from cold

Yes. Getting it to the proper operating temp is *critical* if you
want to avoid seizures.

Lozzo will be along shortly ...

 

darsy says...

I can see why they say it, different oils have slightly different
viscosity and combustion characteristics which could make it run richer
or even worse weaker. I would have doubted its enough to make much of a
difference, still they're the fuckers running them not me.

Never heard of it, are you sure you're not thinking of something else...

 

You're talking Putoline fully synth or Castrol TTS, at a guess.

Pricey, but smells bloody gorgeous!

A litre will last you quite a while, though.

 

perhaps it'd just be best if I ask Paul what oil is in it, and stick
to that.

I remember it from an old RD a mate had in the 80s - made the bike
smell of, well, strawberries and 2-stroke.

here, look:

http://www.bikeworld.ie/putopri.htm

 

yes, those.

cool.

 

However, when it comes to a question of mixing two different types of
fluid in a vehicle, Loz may not be the man to ask.

 

darsy says...

Sensible policies for a happier engine.

hom to the max.

 

My uncle changed his oil on his CRM250 he just disconeccted it and then blew
through th filler.
Took a bit of time, but it worked.

My oil for the CR250 is about £10 per litre, but at 32:1 it doesn't cost as
much as you think.

 

http://www.motocross-shop.de/motocross-shop/product_info.php?products_id=789

 

I was told not to use Castrol 2-stroke oil.
Dunno why, but its got a bad rep in MX circles.