I searched around a bit but could not find an answer.

What engine oil do you all use in your 250s?

I just picked up a 91 MC21 and want to take care of it.

thanks.
dave


Last edited by Bigwave on Thu Aug 14, 2008 5:14 pm; edited 1 time in total

Castrol TTS in mine.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

motul 710 ( 2 stroke )
10w 40 gearbox oil ( fully syn )

banshee wrote:motul 710 ( 2 stroke )
10w 40 gearbox oil ( fully syn )

You don't want to use fully syn engine oil with a wet clutch though.

As for the engine Motul or Rock for me. (fully syn)

Ran rock oil in a 330 Gas Gas trials side car outfit, that bike was used from club up to British championship trials, and in three years all it ever had was a ring. That engine was tuned and used hard I can tell you.

Excellent, so 10w40 engine weight is good. synthetic is prefered.

This is a street bike not a full track bike so it wont see to much abuse, ok maybe not as much riding around a track without police.

[quote]Excellent, so 10w40 engine weight is good. synthetic is prefered.
[/quote]

NOOOOOOO! Please tell me your not going to put that in the engine! Only 2t oil goes in the motor. Do you have an injector setup or is it premix? I notice your in San Diego...Me too. Where abouts do you stay?
_________________
MC21 300R w/SE bits, Rossi 2001
MC28SE Silhouette Repsol

What?

Actual Honda spec for the gear oil is 10W-30 gear oil (shocking that eh?) but 10w-40 (as long as it's not got slippy car agents in it) is OK.

Bloody 2 stroke oil is NOT!

I fail to see the relevence of injector or pre-mix.
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread

I use Repsol 10w-40 in my dry clutch gear box and Castrol A747 for my premix
_________________
1993 MC21 SP

JohnBlaze wrote:

Excellent, so 10w40 engine weight is good. synthetic is prefered.

NOOOOOOO! Please tell me your not going to put that in the engine! Only 2t oil goes in the motor. Do you have an injector setup or is it premix? I notice your in San Diego...Me too. Where abouts do you stay?

I'm in Point loma... when I get this thing tiptop lets go to palomar mt.

sorry but what is 2t oil? is that the 2 stroke for premix/direct injection.?
I have direct injection...


Last edited by Bigwave on Thu Aug 14, 2008 8:43 pm; edited 1 time in total

how about this

any fully synthetic 2 stroke ( either premix or injector )

10w 30 or 10w 40 fully synthetic for the gearbox ( dry clutch )

10w 30 4t or 10w 40 4t fully synthetic ( wet clutch )

Dave (bigwave), you should read this http://www.nsr-world.com/rockoil/

You need a 100% fully synthetic 2 Stroke (2T) oil for the engine, delivered by oil injector in your case (rather than premixing with fuel in tank). The top spec fully synthetic 2T injector oils from leading lube manufacturers such as Castrol, Rock Oil, Fuchs Silkolene, Motul, Shell etc is what you need.

Make sure you don't use synthetic 2T scooter oil or semi synthetic 2T oils.

2 stroke engines are completely separated from the transmission, with respect to oil. Unlike 4 stroke engines where the oil has to lubricate the engine & gearbox. So choose a dedicated 2 Stroke Motorcycle Gear Oil, again from one of the manufacturers above (or equivalent).

Wet or Dry clutch? Some racing 2T gear oils, designed for bikes with dry clutches, have enhanced high shear lubricating film additives (reduced friction under high load). As the gearbox oil does not touch the clutch, this is good. But if the clutch is Wet, the gearbox oil also lubricates the clutch plates. Such 'special race' gear oils can actually reduce friction so much they can cause the wet clutch plates to slip. To make it easy, most leading lube manufacturers make high end 'universal' motorcyle gearbox oils which are suitable for both wet & dry clutches.

Don't mess around looking for a 4 Stroke (4T) synthetic engine oil for your NSR gearbox.
_________________
Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30

I've used Shell Light Gear Oil in every 2 stroke I've owned with no probs.
_________________
NSR300R - Why did i ever have a 250...

Thanks to all of you guys for your time and information...
I have a good idea now on what to use.

fully synthetic. It looks like brand wont have a large impact as long as I use the correct weight, and that seems to be 10w40 for the gear box.

Thanks
Dave

EDIT - just so your guys know, I have the wet clutch I think as its just the nsr 250R not the sp or se models, and its oil injected.