How to replace your sprag clutch.

[losthaga]

Bruce, I had mine done at Martin's Eurosports in Coopersburg PA 18036. (610)282-9300. My bike had 11303 miles on it when my sprag failed. No warning just wouldn't start one day. They didn't break down the parts price. Receipt reads like this. 1 Starter sprag assy. $597.58 1oil filter $11.33, Diagnoise sprag $17.25, R&R Sprag/Oil $241.50 Parts sub total: $608.91 Labor sub total $258.75 I used all Aprilia OEM parts in mine. I replaced the entire thing, just to be safe! They all seem to fail with time. Start the bike as least time as you can and always keep a STRONG BATTERY in her. I use a dry cell battery now and a Yamaha relay. Trickle charger is a big plus. If the bike don't start right easy, stop trying and charge the battery!

has anybody had one of these done by a Shop? how much it costs?? im scared as shit to think this is going to happen to my bike... whats the chances of it happening?? anyway to postpone the breakage?

[Hatchman]

I would say prevention would be:
Bigger battery on trickle charge
Yamaha Starter Relay
Brown connector 'mod' (soldered connections and bigger wire to battery)
European headlight switch so you can turn all lights off while starting

Great writeup, hope I never have to use it.

[odie_trackie]

Those are all good points. I like the Euro light switch idea.
Something else I did recently was to replace the turn signals, running lights and brakes lights to LEDs. I noticed that the instrument back lighting would dim every time I would hit the brakes. That means it's drawing non-trivial amount of current. After I switched, the gauge lights don't dim.
I got a LED timer relay too.

I might get some LED gauge backlights too and maybe a HID kit for the main headlight.


Thanks for the kudos. I'm glad it's been useful.

I would say prevention would be:
Bigger battery on trickle charge
Yamaha Starter Relay
Brown connector 'mod' (soldered connections and bigger wire to battery)
European headlight switch so you can turn all lights off while starting

Great writeup, hope I never have to use it.

[Futura]

How does a sprag failure (in the stator housing?) damage the starter?

[kzmille]

It appears from the pictures above that the sprag might have locked up completely which then spun the starter at high speed. But I wasn't there, so...

[Ally V60]

has anybody had one of these done by a Shop? how much it costs?? im scared as shit to think this is going to happen to my bike... whats the chances of it happening?? anyway to postpone the breakage?

Mine was kind of fooked/knackered/toast! all in a oner, cost the wrong side of €750, 2 years ago. At todays rate it would be cheaper to by a second engine!

[Phydeaux]

http://www.apriliaforum.com/forums/s...d.php?t=166304

1000 miles as of today.

[ZdaMan]

Well I got mine done. Ducati sprag and oem housing. Wasn't as bad as I thought it would be. However, I did end up with a problem that took more time to diagnose and fix then the sprag. A wire got pulled out the
Crankshaft position sensor. Must of barely been making contact because no codes showed up.

So my advice to the next guy is to use caution when you open the case. There isnt much slack on the wires

[mille03]

this is gold . it's good to see people helping other people . thanks

[odie_trackie]

Well, I am really pleased that this is helping people out. That was my original intent.

[ZdaMan]

The more I think about it I believe the wire from the crankshaft position sensor was loose the whole time and this is why the sprag went bad. That and i am a idiot because I didnt know when to stop trying to crank it Was more worried about meeting my buddies and missing the ride then anything.

[odie_trackie]

Well, it's not the really the cranking itself that kills the sprag. It's the engine kicking back that whacks it.
If the engine is hard to start, invariably you will get more "kickbacks" and that will hasten the sprags doom.

But you may have a point. That wire being loose and providing an iffy connection probably contributed to your spags departure from this world.

[adelyser]

I just did my sprag a few weeks ago. Big thanks to all on this thread. I went with the OEM housing, and a BMW sprag, works like brand new.

After comparing the worn vs. new parts, I feel that the sprag was probably ok, it was the housing that was worn out, definite grooves worn into it.

My biggest pain was getting the stubborn flywheel off. I bought the 22mm bolt, and tried pulling it off after heating it, all I did was mangle the threads. I used my oxy-acetylene torch, and started heating it just til it started turning color, and it fell off on it's own.

Bike runs awesome now.

[odie_trackie]

Very glad this thread has been able to ease someone through what seems to be the RSV1000R right of passage.

Maybe we should say:
"There are only two kinds of Mille owners: those who have had a failed sprag and those who are about to."

I just did my sprag a few weeks ago. Big thanks to all on this thread. I went with the OEM housing, and a BMW sprag, works like brand new.

After comparing the worn vs. new parts, I feel that the sprag was probably ok, it was the housing that was worn out, definite grooves worn into it.

My biggest pain was getting the stubborn flywheel off. I bought the 22mm bolt, and tried pulling it off after heating it, all I did was mangle the threads. I used my oxy-acetylene torch, and started heating it just til it started turning color, and it fell off on it's own.

Bike runs awesome now.

[SmaRTrxxv]

I just did my sprag a few weeks ago. Big thanks to all on this thread. I went with the OEM housing, and a BMW sprag, works like brand new.

Second that

I also went with the BMW sprag, I works perfectly :-)

Thore