starter sprague

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Joined
Oct 5, 2006
Messages
381
Location
Belgium
As so many people before me I am also on a quest for a working starter on my 2002 650, have bought the R6 starter and the super battery from 'ol cranky' and am now playing around with the torque converter and the sprague.

Torque converter is working properly tested it with a torque wrench and it clicks at 11nm so should be good.

The sprague is another story:


http://www.youtube.com/watch?v=AHcTH5sRK6Y

I then dissasembled the sprague and tried to unwind the spring:

365130528.jpg


Offcourse, my sausage shaped fingers combined with a tiny spring is a recipe for disaster, this is the result:

365130534.jpg


Don't think it's ahuge problem, still fits in the groove of the sprague, so wen't ahead anyway.

365130532.jpg


the spring originally is around 15cm, I took of 5mm at a time and tested everytime. Ended up with 12cm (these measurements are not correct since the spring I measured is the messed up stretched one, so just go 5mm at a time)

And this is the result:

http://www.youtube.com/watch?v=WA3PVpWaQQM


So the trick actually works, but when I put the sidecover back on and the plug in (filmed test was without plug so no compression), it started for about 5sec and then slipped again, so I guess my sprague is so worn out that even this trick isn't enough to save it.

Anyway worht a try if you have more recent 650 with a slipping sprague.
 
Hi BB

I went through the whole lot my self in my eager to get E-start. I have a LONG story on this somwhere on this site. So far a great succes.

What you maybe "failed" to mention is that it ALL starts with a propor AutoDecomp and then go for the stuff you mention. Also Iv'e read that high viscosity oil is a contributing factor.

Good luck

Anders, DK
 
Husaden said:
Hi BB

I went through the whole lot my self in my eager to get E-start. I have a LONG story on this somwhere on this site. So far a great succes.

What you maybe "failed" to mention is that it ALL starts with a propor AutoDecomp and then go for the stuff you mention. Also Iv'e read that high viscosity oil is a contributing factor.

Good luck

Anders, DK

Hi, I checked the decomp thing in the cam and it look's pefect no wear on it or anything so don't think the porblem lies there. With the plug in it start ok for about five seconds and then slip, wich makes me think it's the sprague is the culprit. If it was the decomp thing the sprague would slip from the start??
Anyway it's not an expensive part, so i'll order one, put it in and see how it goes, if it's not ok, i'll order a new decomp thingie (sorry lost the name) for the cam.
 
Have you thought of too thick oil ?? Building up the pressure and then slips...??? Is it very cold where you are .....

Just a thought

Glad to hear you can get the sprague cheap....... I Heard they where rather expensive...

Anders, DK
 
Thats not so bad then..

You put a link for the 04 model. I think to remember that the assembly was beefed up on this model and you might have to upgrade it all.. More about this in the doc's. The 02 sprague should go for the the same price anyway i s'pose

Anders, DK
 
Havent checked the manual again, but isnt the part that you have worked on the torque limiter? the sprague is the one that you are holding in place with your finger (with the large nut inside the gear - the starter drives this before the torque limiter).

your vids confirm the screeching noise that is asociated with the failing torque converter.

I think there is a lot of confusion on this due to using wrong names for parts, Im guilty of doing it too.

Azza.
 

Attachments

  • sprague pic.jpg
    sprague pic.jpg
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His finger in the picture of your down load is on the torque limiter the other is sprague.
 
Torque converter is working properly tested it with a torque wrench and it clicks at 11nm so should be good.

i would go for a lot higher than that. more like 25 pounds/35Nm.

regards

Taffy
 
a good test for your autodecomp is to simply kick the engine over slowly and feel whether or not there is significant resistance when you get to tdc. if you can't tell easily where tdc is... your decomp is working ok.
 

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