I have a 05 roadstar I need to know how much oil?

Question edited for clarity.

RM85 Fork Specs. Bound to be the same forks

When adjusting the fork oil level, compress the outer tube fully
without the fork spring.
? 09943-74111: Front fork oil level gauge
? Fork oil level (Standard): 124 mm (4.88 in)
? 99000-99001-SS5:SUZUKI FORK OIL SS-05
? Standard fork oil capacity (each leg): 351 ml
or an equivalent fork oil
(11.86/12.36 US/lmp oz

Free Service manual for the RM85

https://www.manualslib.com/manual/824675/Suzuki-Rm85.html?page=164&term=fork+oil&selected=1#manual

Lots of Service Manuals for around $34

https://www.ebay.com/itm/385931112664?hash=item59db4970d8:g:WyUAAOSwkFpj2-n~

More here.

https://www.google.com/search?q=1986+suzuki+rm80+service+manual

..

600cc 05/06
Front Fork Oil cc (right leg):467Front Fork Oil cc (left leg):467

I'm sorry but I don't have the specs on the quantity and type of fork oil for your year and model bike. I work on the older bikes that the dealers will no longer service. But, I can describe the difference between the "wet" and "dry" conditions of the fork assembly. If you take the front forks apart, clean them out, and put them back together with no oil in them, they are considered "dry". For a simple drain and refill type oil change on them where you don't get all the oil out of them, they are considered "wet". I hope this helps, You can call you local dealer's service department and they should tell you the quantity and viscosity of the oil that goes in the front forks on your machine. They'll tell you something like 6 ounces of "Type E" oil, for example. Harley-Davidson uses these types of specs to describe their oils. If you go to a website for fork oil, like PJ1, they may give a cross reference or equivalency chart for converting H-D "Type E" to their oil. I think that would be their 30 weight oil. If the front end seems too "stiff" with 30 weight, you can drop down to 20 weight. I think Honda makes a 25 weight but not sure. Your Harley won't mind the Honda oil. BG.

Good Luck
Steve

Since your bike is a 2011 model, I'd take it to the dealer and let them check out the loss of power. On the front end diving, you may need to put a heavier viscosity oil in the front forks. You'll have to drain the forks and then refill them with the proper amount of oil of a heavier viscosity. I think the forks come with H-D type "E" oil that is supposed to be about 30 weight. Use only "fork oil". You cannot use engine oil.

Good Luck
Steve

To change the fork oil, look down on the lower part of each fork leg just above the axle on the backside of each leg and you'll find an Allen plug or small screw. Take this screw out, hold the front brake and push down on the front forks. The fork oil will come out of the tube. Do both sides at the same time. Once you get the oil out of them, reinstall the drain plug. Then, take the large hex cap on ONE TUBE AT THE TIME and pour the correct amount of the correct fork oil into each tube. There is a specific amount of oil that must be poured into each leg. Since you simply drained your forks instead of disassembling them, you should use what is known as the "Wet" quantity of oil. I'm pretty sure your bike takes 9.0 ounces of oil in each leg. Call your local dealer and they'll tell you how much oil to put in. Your bike came from the factory with "Type E" oil in the forks. The viscosity of the oil determines the dampening effect of the forks. Heavier oil will stiffen the front forks, a lighter viscosity of oil will make the front end softer. You can check the Internet for fork oils and they should give you a comparison of what weight oil is equivalent to "Type E" oil. I think PJ 1's 30 weight oil is the same as type E Harley oil. Use only "fork oil" in your front forks as it has special "anti-foaming" agents in it. If the oil foams up, you'll lose the dampening effect in your forks.

Good Luck
steve

take contact with Castrol! ASK-
Castrol Fork Oil

If you are saying that your front suspension is too soft, you can change the fork oil in the front forks to a heavier viscosity. I think Harley recommends Type E fork oil. I've found that PJB 30 wt. fork oil works best for me.

Since I'm not familiar with the newer forks, I'll have to recommend that you ask the dealer how to drain and refill the forks and how much oil to put back in them. There are usually two amounts of oil to put in the forks. One amount is a "dry" amount to add when you disassemble the forks and then refill them. The "wet" amount is for when you simply drain the forks and then refill them. Naturally, the "wet" amount will be less than the "dry" amount.

Sorry I couldn't give you more information but my expertise is the earlier model Harley bikes.

Good Luck
Steve

If you front forks are bottoming out, you need to add a heavier weight fork oil most of the time. If you're using type H-D type "E" oil, you may want to try something like PJ1-30 wt. That's what I run in my FXDWG. It will stiffen the front end. Of course, the quantity of oil you put in the forks has a lot to do with it as well. I'd stick with the factory recommended quantity unless I could not get the forks to dampen the way I wanted them too.

As far as upgrading your suspension, take a look at Progressive. They make some stuff that might be suitable for what you need.

Good Luck
Steve

fork oil capacity is 578 to 586cc