Viscosity for high perf. single cylinder motor

[maKe]

Hi! I'm new here and hopefully will learn a thing or two about oils here.

My bike is 2011 Husaberg FS 570 in supermotard trim, and sees mostly high revs and a lot traction on paved roads. Also some minor offroad and gravel road action here and there.

Currently ~95h/5500km on the motor and It's been ran mostly using Mobil Delvac MX 15w40 mineral oil with change interval of 5-10 hours. First 5 to 30 hours I had 300v 15w50 in it, then up to 40 hours 50/50 mix of 300v and Delvac MX, and after that just straight Delvac.

Right now I'm at the point of building the motor and hopefully getting close to 70whp out from 564cc single. Manual recommends 10w50 or 10w60 Motorex cross power 4T Full Synthetic stuff.
Whats to point for 60 weight oil? Finland has outside temps in the summer usually +18-25 celsius so it's fairly "cold" in here.

I was thinking for just piece of mind to run again 300v Motul after the motor is done and dyno tuned. Just can't decide the viscosity to run in it. 5w40 must be like water in it, but then again 15w60 sounds pretty extreme to me. So it's either 10w40, 15w50 or 15w60 but which one? Or I just could revert back to Delvac and change it after 3-5h of use, but I want the best protection for it so it does not blow up (too soon).

 

[Clevy]

I use rotella in all my shared sump bikes and havent had any problems.Its cheap and meets the JASO standard,and its cheap.
we have a member called sunruh,he is the man when it comes to bike oils and he would be the man to ask.
Perhaps send him a pm

 

[Robenstein]

I find a 10w50 or 10w60 to be extremely prone to shear in a shared sump system. My Triumph which is my no mean a highly stressed engine chewed up the Castrol 10w50 in no time.

Id say stick to something with a narrower spread like your Delvac

 

[bmwtechguy]

You probably have many different oils there that we do not have and vice versa. Best to contact Sunruh. Your Delvac changed often sounds the best plan so far. I would even consider a straight 40 if temps not cold.

 

[heynow]

In my opinion, the 50 and 60 weight oils recommended by Husaberg are an attempt to combat potential heavy fuel dilution and low oil levels under racing conditions that might cause problems for a thinner oil. It is basically a race bike for the street after all. What is the oil capacity, a quart or so?
The lubricant would hardly even get a chance to shear with the extremely short oil change intervals given in the manual.

Under less severe conditions a 40 weight might be ok.

 

[maKe]

Good ideas here!

Oil capacity with filter changed also is approx 1.35 liters, so a bit more than quart.

Yes I think the Delvac seems to work just fine, as I get next to none metal shavings on the drain plug and in oil, unless I accidentally did a miss shift.

We are talking now (hopefully) alot more powerful motor than what it left from factory, and the condinitions I run it are more extreme than offroad situation where it has less traction on rear wheel (less strain on crank, transmission etc.).

Maybe the oil does not play a large role how the motor is going to wear after all, but I'd still like to play it safe and put the right stuff in considering my use and weather. On long road race tracks pinning sixth gear at limiter is going to be pretty stressful.

 

[Warlord]

Post a pic of that beauty!

 

[maKe]

Well guess what! My FTP site was shut down completely few weeks ago with tons of pics my toys and projects from past years. But luckily I have a video available and some pics on hard drive.

Just need to find more reliable FTP site for my pictures where they don't get deleted without noticing.

 

[vo_marz]

if your pushing it every second of the 8-10 hour life, i'd say go straight to a quality 15W50 or straight SAE50/60 race spec oil.

Hi torque chews thru oil like a lightsabre thru butter.