750 starter sprag refurb

[smlav]

I’ve searched through forum and read everything I could find re starter sprag. I have some questions I couldn’t find answers to, and would appreciate the wisdom of the experienced please.

The sprag in photo’s is from a later GTL motor, and has three bolts which appear to hold the back plate on, I’ve not seen any other reference to these bolts. The SF1 motor I have does not have these bolts, so presumably a later model addition. Anyone know their purpose.

The spring washer in photo, should I use a new one when refitting?

I want to clean the whole thing up, get rid of the rust. Is an ultrasonic cleaner suitable (have never used one), or should I use the likes of a Dremel and buff it up with autosol etc.

I’m in the UK. The rollers and springs are all intact, but I’d like to fit new. Where’s best place to go? I couldn’t find on Lav paradies web, I think Wolfgang may have them, but UK would be preferred if possible.

Thanks
Sean

 

[Tippie]

Originally it is riveted, and someone has dismantled it and fitted bolts. It is said that this is dangerous in case it falls apart, but one of my SF ran for decades with some screws and nuts. I just degrease and thoroughly clean it, try to get something into the plunger holes to get any crap out. It is hidden under the cover so there is no need to polish it. The surface on the sprocket/freewheel that the rollers grab onto must be in very good condition. Not sure of UK suppliers but you can get things like that from Germany from OCT, and I am sure LavParadies has them if you look a bit harder. I am not sure if the spring washer is special for the reverse thread nut, mine is flat with no spring left in it and the nut has never come loose.

 

[sfcpiet]

Special washer for LH thread.

Riveting the clutches is not rocket science and usually a lot safer than fitting screws/bolts, etc... and it looks a lot neater.

piet

 

[smlav]

Thanks,

So I guess the bolts aren’t OE then.

Do I need to get a new washer?

Sean

 

[piranha-bro2]

I still use my original 1973 washer - never come loose. You can shine the clutch up a bit if you mount it in a lathe (or a drill press if you can fashion an 'axle') and clean with emery. Rollers and springs readily available from the usual places.