SF Starter whats missing

chrisk

chrisk

Hero member
Location
Brisbane, Australia
Have located all I can of my 750SF Starter Motor, can somebody tell me what's missing?
Items I have:

1: Mounting flange with an internal planetary gear ring
2: The armature
3: The casing with the magnets in it
4: Aluminium cage with brushes located in it
5: Brush cage cover

There seems to be another casing, and gears or something, and the sprocket shaft missing, does this sound correct?
 
Don't get me into the Nippondenso 750 SF Starter - I exploded one that engaged when I accidentally hit the START Button when the engine was spinning at 7000 rpm (Astray Material). Hence why I, today, ground the Starter Solenoid through the transmission NEUTRAL switch so the starter relay only activates when the transmission is in Neutral - COST me $900 back in 72 when I paid $1600 for the bike. Had to order it from the Breganze Factory back then - To Day, I dissemble and clean the starter about every 5 years and ensure the Starter Clutch is up to snuff.

I've seen Nippondenso 750SF Starters go for as low as $150 on eBay.

What's missing - Ensure the Back Plate on your starter clutch is not loose and the Dogs are in good shape and for safety sake ground the Starter Solenoid though the transmission neutral switch.
 
Actually read your post ages ago re grounding starter solenoid via the neutral switch. Very good idea and works perfectly.

Now bike will only start in neutral.

Cheers!
 
If you hear chattering when spinning the starter, I can about garrantee the Starter Clutch Back Plate Rivets are loose and the Dogs are rattling and slipping. You can either MIG Weld the Back Plate solid or tap and drill using bolts but the main-shaft snout has to be polished smooth with a fine sharp file and the Dogs and Springs of the Clutch in good condition - I pack the Starter Clutch with Moly-Grease.
 
chrisk said:
,, can somebody tell me what's missing? 
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& perhaps sir would like a pretty picture?  so ya can just pick a farken number?  :-X
Extract-SFstarter_1.jpg

Extract-SFstarter_2.jpg

 

Attachments

If your original Nippondenso Starter spins with a Battery, I doubt there anything wrong with it as they are a very tight and self contained unit - Look at the Starter Clutch, which sadly has very weak rivets on the Back Plate of early Breganzes.
 
Laverda SF said:
Don't get me into the Nippondenso 750 SF Starter - I exploded one that engaged when I accidentally hit the START Button when the engine was spinning at 7000 rpm (Astray Material). Hence why I, today, ground the Starter Solenoid through the transmission NEUTRAL switch so the starter relay only activates when the transmission is in Neutral - COST me $900 back in 72 when I paid $1600 for the bike. Had to order it from the Breganze Factory back then - To Day, I dissemble and clean the starter about every 5 years and ensure the Starter Clutch is up to snuff.

I've seen Nippondenso 750SF Starters go for as low as $150 on eBay.

What's missing - Ensure the Back Plate on your starter clutch is not loose and the Dogs are in good shape and for safety sake ground the Starter Solenoid though the transmission neutral switch.
Click to expand...
How, or why, did you hit the starter switch at 7000 RPM  :o
 
"Now bike will only start in neutral."

Pain in the arse when sitting at the front of the traffic at lights and the motor stalls!! Possibly dangerous!! I never sit at the front of traffic in neutral either for that very reason  Have had SF1, 2, 3, and still have the SFC and collectively, probably done well over 300,000 kays and have never had a starter problem even when accidently hitting the starter whilst travelling. I reckon Ron had an issue with his starter clutch for it to explode.
If the starter clutch is working properly it shouldn't happen. No way would I ever wire my starter through the neutral switch.
 
It's interesting how opinions and riding styles differ. I prefer to select neutral at traffic lights. It's an old habit from my 2-stroke days when the (Yamaha) autolube pump that lubricated the engine wouldn't operate if the clutch was pulled in (took its drive after the clutch). If you sit still for too long with the clutch disengaged, the engine could sieze.

I still prefer neutral with the Laverda to avoid the clutch pushrod boring a hole through the square toggle bar.
 
Dellortoman said:
I still prefer neutral with the Laverda to avoid the clutch pushrod boring a hole through the square toggle bar.
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And im assuming any car, truck or other bike that you may choose to drive

It nice to your leg/arm and its also adding to the longevity of your vehicles clutch

I mean really do you guys not know this

and as far as stabbing the starter at 7k rpm, well it nice to see your not infallible Ron...

Beers with Bevelman, oh to be fly on the wall
 
How, or why, did you hit the starter switch at 7000 RPM  :o
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I like my LUCAS controls but you have the Start/Signal SX/Kill Switch very close together and its possible believe me.

Yes I've had the engine stall at lights but really no issue reaching down to place the lever in Neutral. It's absurd to understand why one would hit the Starter Button if you're foolish enough to rev the engine at 7000 while in Neutral - LOL
 
Laverda SF said:
I like my LUCAS controls but you have the Start/Signal SX/Kill Switch very close together and its possible believe me.

Yes I've had the engine stall at lights but really no issue reaching down to place the lever in Neutral. It's absurd to understand why one would hit the Starter Button if you're foolish enough to rev the engine at 7000 while in Neutral - LOL
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At 7000 RPM (and in gear) those switches, including the turn signals, are the last of my concern since in this mode of operation it would appear that I am in a race  :o :o :o
 
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