999shock conversion for S2R1000

[Monstermash]

If i were you, I would wait and check ebay every day until a nice clean stock 999 Showa shows up. I would buy that and install it on my bike and not worry about the rebuild right now.
 Wait until the riding season is over and then remove it and install the new valves etc.

[TAftonomos]

+1

I'm so far out of whack I NEED to get the shock done, else it won't be any improvement at all.  In your case, I'd bolt it on and ride it to see IF you might need to change anything.


On the breather subject, I've been cautioned by some pretty well known engine builders NOT to put a filter on it and call it a day.   The higher RPM's seen on my motor almost require a breather box.

I ordered a corsa reed valve, and I'll mount it in the airbox, gut the stock breather valve of the reeds, and fab up some sort of catch can for the vapor/oil.  If I set up the inlet/outlet like the factory does, it will let any excess oil drain back down into the crankcase, keeping it out of the airbox

[He Man]

Link? There is a built in reed valve in the beggining of the crank case breather tube supposely but why would you need one at the airbox? What i planned on doing was to cut the box out, Install a U and then a breather and hide it under my seat.
run the tool kit, so i have a few extra inches of space there to work with.

Why do you need a cramk case breather box if you run higher RPMS? i run my bike high up there as well.

[TAftonomos]

The higher the RPM's, the more air is moving around in the crankcase.  In the case of the 4 valve, I spin it up to 11K.  Unless the 2V has had extensive work, running it past 8K is pretty futile.

The reed valve right on the breather is find, but removing it actually increases the volume of the crank case by however large the breather system is.  Also, the reed right on the crank case inhibits oil drainback.  By putting the reed valve in the airbox, not only are you giving a larger area for the crankcase gasses to expand to, but you are allowing oil a much more free path to drain back into the case.

You can simply vent the breather, but running a hose back into the airbox is better.  The reason being is that the airbox is under vacuum, and will draw out the crankcase gasses.  Without the vacuum, the breather tube/hose/ssytem has to be much larger to evac the excess gas than it would be if there is a vac on it.

Make sense?

[55Spy]

http://cgi.ebay.com/ebaymotors/OHLINS-rear-shock-DUCATI-999R-999S-999-2007-749R-749S_W0QQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247QQcategoryZ35615QQihZ014QQitemZ330251059752QQrdZ1QQsspagenameZWD1V

Or $300ish short of an ohlins......

Youll be happier with any upgrade most likely.  and it'll all be showa if you do that swap, you go ohlins or penske and you might feel like getting forks too, then you're wallet will hate you for a long time.

[He Man]

The higher the RPM's, the more air is moving around in the crankcase.  In the case of the 4 valve, I spin it up to 11K.  Unless the 2V has had extensive work, running it past 8K is pretty futile.

The reed valve right on the breather is find, but removing it actually increases the volume of the crank case by however large the breather system is.  Also, the reed right on the crank case inhibits oil drainback.  By putting the reed valve in the airbox, not only are you giving a larger area for the crankcase gasses to expand to, but you are allowing oil a much more free path to drain back into the case.

You can simply vent the breather, but running a hose back into the airbox is better.  The reason being is that the airbox is under vacuum, and will draw out the crankcase gasses.  Without the vacuum, the breather tube/hose/ssytem has to be much larger to evac the excess gas than it would be if there is a vac on it.

Make sense?

555spy, its closer to $400 ;-) , and is that a OEM Ohlins unit or a factory ohlins unit? The difference in them is apprently large enough. Finnaly I DONT NEED AN OHLINS REAR SHOCK!!!! I already spent $600 on a fork rebuild with racetech valves spring and oil and its working out great for me so far.

I get all that except i still dont understand why putting a reed on the airbox would increase the voulme of the breather system. With a valve or not, the vaccum from the box will always suck gases from the crankcase. The way i understood, i can ditch the breather box and attatch a filter on it. On that tube, i will use a Y splitter and run the other tube into the airbox. I loose the voulme of the breather box, but in a 2v where 8500rpm is basically my rev limit, it shouldnt matter. Did i get this right? I still need a solution to the oil issue though. How much oil gets spit into the crankcase breather box? I;m talking about the maximum amount of oil i can expect to spit out ( i run my motor pretty damn hard on the streets)

[Some Dude]

According to racetech's website the 999 has a spring wt of 7.8kg/mm and the S4 has the exact same.  They put that spring as rated for a rider of about 210lbs.  Shameless Plug I have a 999 shock on ebay with less than 500 miles on it  If someone here wants it before bidding starts ill sell it for $125 Shipped in the lower 48.


http://motors.shop.ebay.com/merchant/jproct

[TAftonomos]

Interesting that they recommend that spring for my weight, when just about everywhere else says it's to soft.

I wish I could find the rate on the S4R spring on 07 bikes (sachs shock). 


The reed on the box will allow the oil to more easily drain back into the case, instead of getting blocked by the reeds.....the only time the reeds are "open" is when the motor is forcing air from the case, which isn't going to let/help oil draining back in.

[Some Dude]

That is calculated for street riding, for racing it would be stiffer

[TAftonomos]

Might be for some sedate street rider, but I can assure you the rear shock on my 999 was waaaaay to soft for the 999 out of the box.

[He Man]

Taftonomos, how much do you weigh?  I find the stock S2R shock to be decent for my weight. (135-160 depending on season and gear  i weigh more during bacon season)

Somedude, i eyed your shock and am currently waiting on it to end so i can attack bid!!!. Because i was hangingout with another board member, i missed the opportunity on a 1098 shock that went for.....>$51.00

However....i could take it of your hand early nice and easy...can i get some close up pics? how sure are you that it was off an 06 999. click my profile for my gmail address.  

edit: Checked the Spring rate calculator from racetech for the Ducati 999 (S2R1000 is not listed, neither is the M1000ie) My weight calls for 6.88 kg/mm for street and  7.22 kg/mm for track. If he stock 999shock is 7.8kg/mm then i assume it should be ideal. but is the racetech shock calculator accurate? I run their specs for my front forks. It says .93 for track, i have .95 for my forks + valves.

Im going to look around for other rear shock calculators. What if i ran my shock a bit harder then stock? Or perhaps a better question is, what is the stock springrate on my S2R1000? The S4R is also 7.8, and if i put my weight for that bike it puts out 7.49kg/mm. What are some of the characteristics of a bike running a slightly stiffer shock than recommended?

[55Spy]

I DONT NEED AN OHLINS REAR SHOCK!!!!

Need vs want, it's a petty difference usually involving a large sum of $ or 

[TAftonomos]

Taftonomos, how much do you weigh?  I find the stock S2R shock to be decent for my weight. (135-160 depending on season and gear  i weigh more during bacon season)

I'm 6'5, around 240 right now, with prolly a good 10-15lbs I could loose.  Not much left to loose after that unless I want to look like a twig


For me, their calculator is/was dead wrong.  They say the shock on the 999 is the idea spring for street use for my weight.....

It's one of the first things I was told/recommended to change.

[He Man]

I'm 6'5, around 240 right now, with prolly a good 10-15lbs I could loose.  Not much left to loose after that unless I want to look like a twig


For me, their calculator is/was dead wrong.  They say the shock on the 999 is the idea spring for street use for my weight.....

It's one of the first things I was told/recommended to change.

thats strange, the stock 999 shock is just a a hair over what is recommended for my weight, and you have almost 100 lbs on me. Something is screwy with that thing. Where can i find some accurate spring rate information?

[Monstermash]

www.kyleusa.com


Give Dan a call. He's the go-to guy for suspension.