Fork oil capacity and viscosity ybr250

Behold
The only specification for ybr250 fork oil capacity level volume whatever you call it on the internet.

It is really annoying when the manual lacks the basic information about the fork oil level. Even the stealership do not return my call.

I was left to follow suit of the similar honda cbx250.
I put in the recommended fluid which was atf which is about a 7w. Cost me $10.

Initial plan was to follow suit with whatever was in the fork. However, the right side had 100ml and the left had 300ml which was hell of overflowing when I did a fork seal cleaning with an improvised seal mate.

Draining the 100ml fork was hell nasty.

According to the cbx manual i had to put on 295 ml. This resulted in 140mm from the top of the fork fully compressed with no springs spaces or washers in. Seems pretty normal from my experience.

Let me clarify.

Oil Level

Fork oil level alters the second half of the suspension but more to resist bottoming out rather than feedback or damping characteristics. 

Oil viscosity 

Alters the damping effect. 

Heavier fork oil of 15w will give you better feedback during cornering as it will gradually dive. Bike will feel heavier and more footed.

Lighter oil like 5w and 10w will absorb road imperfections better.

Atf is 7w.

Dont go about using any 10w oil because high detergency and anti foaming is important.

I am 87kg.

Starting from the nightmare 295ml and 140mm, I altered it to 215mm with 235ml I could bottom it out with compressing the fork myself. . After riding a little bit more, I added 10ml(total of 245ml) more to hit 202.5mm of oil level(air gap) measured from the top.

Every 10ml will raise or drop the level by 12.5mm

I might do a 15w weight fork oil for my future service because the roads here are quite good.

UPDATE 1 MONTH LATER

I have a 1600km upcoming trip and wasnt happy with how nervous the bike felt.

Went to drain the forks and the left one seemed contaminated.

I bought a 15w dedicated cheap fork oil and will not look back. Feels like a whole different bike now ; planted and offers a plush ride.

Would even consider a 20w in the future.

Below is the only info on the net what ybr250 has a 10w fork oil stock in it

Edit. I have added 10ml into each forks.

Feel slightly better but i think this bike needs stiffer springs