Busted aftermarket starter plunger for Breganze twins

piranha-bro2

piranha-bro2

Hero member
Location
Melbourne
Bought rollers, plungers and springs from can't remember where. Starter clutch almost immediately started slipping and grounching - low battery and very sluggish turnover didn't help. But was pretty concerned when I pulled it off and found this - plus two or three others plungers were semi stuck, one quite badly - only two springs of the 6 brand new could be used again.

Put old genuine ones in - they look like totally different material and mine are probably 50 years ol. Anyone experienced this type of breakage with replacement non-genuine plungers?
 

Attachments

  • Broken starter clutch plunger.jpg
    Broken starter clutch plunger.jpg
    51.8 KB · Views: 37
To shatter like that must mean it's very brittle, I wonder what its treatment was being made. Tool Steel hardened and tempered or some other chemical hardening.
 
On my 750 I had this problem quite often every couple of years the only way I found to fix it was to get a replacement set of springs and pistons from Wolfgang I did once have some made at local engineering shop but they didn’t last long at all so went back to the originals and worked fine for about 3 or 4 years I found the battery was the most important thing as long as it was charged it worked ok
 
Dave said:
On my 750 I had this problem quite often every couple of years the only way I found to fix it was to get a replacement set of springs and pistons from Wolfgang I did once have some made at local engineering shop but they didn’t last long at all so went back to the originals and worked fine for about 3 or 4 years I found the battery was the most important thing as long as it was charged it worked ok
Click to expand...
I squirt some light oil into the freewheel maybe once a year on my SF2. It hasn't been dismantled in 10 or more years and the bike sees a lot of use.
Battery is just about never charged but the bike is usually run at least every two months.

Paul
 
Dave said:
On my 750 I had this problem quite often every couple of years the only way I found to fix it was to get a replacement set of springs and pistons from Wolfgang I did once have some made at local engineering shop but they didn’t last long at all so went back to the originals and worked fine for about 3 or 4 years I found the battery was the most important thing as long as it was charged it worked ok
Click to expand...
Thanks Dave. I have a sneaking suspicion I bought these from Wolfgang - could be wrong. They are definitely not the same as the original Breganze ones - I've had starter clutches play up, and seized plungers, but never had one break.

Hopefully rebuild with old originals, new springs and a charged battery will fix it. Have never used oil, Paul, but may consider it if it happens again.
 
piranha-bro2 said:
Thanks Dave. I have a sneaking suspicion I bought these from Wolfgang - could be wrong. They are definitely not the same as the original Breganze ones - I've had starter clutches play up, and seized plungers, but never had one break.

Hopefully rebuild with old originals, new springs and a charged battery will fix it. Have never used oil, Paul, but may consider it if it happens again.
Click to expand...
I use grease when assembling, helps keep the parts in, then oil from time to time from outside since I have the last type of freewheels with a hole to each plunger from the periphery.

Paul
 
Using a starter clutch out of my SF that was perfectly functioning with old plungers and rollers. Only replaced them because i thought it a good idea when doing a 100% rebuild of everything.
 
Well I gotta say…… a very special bike built by a passionate Laverda Man! The sound of that 270-880 makes outta that speccy Siamese exhaust system, is as my mate Robbie would say ‘Horn’

Has to be seen in the flesh! 😎
Tis a credit to you Q 🙌
 
hooksey said:
Well I gotta say…… a very special bike built by a passionate Laverda Man! The sound of that 270-880 makes outta that speccy Siamese exhaust system, is as my mate Robbie would say ‘Horn’

Has to be seen in the flesh! 😎
Tis a credit to you Q 🙌
Click to expand...
Thanks Hooksey (Hooksey is my plumber, so he had special privileges). It's true, the beast lives and it is something to behold. I've been fine tuning so that the first test ride isn't a pop-and-fart-and stall affair. Want it registered asap. After some teething probs with the Ignitech settings and the FCR39mm carbs it finally fired into life.

I'll get some nice pics and hopefully a vid and post soon. Middle finger to all you hecklers and teasers and a nod to all who have encouraged me over the many many years of this build. Now for the dyno and the suspension tuning!
 
Seeing is believing, pics or it didnt happen, lots of other shit to get some pics happening. You defiantly sound brighter lately. New bike smell here or what.
 
Quentin and I had a bit of correspondence on setup and programming of the Ignitech ignition. He said he got it all working, and he sent me a short video of the bike running as evidence, but it could have been a fake. Could be easily done with someone else running another bike out of shot to provide the soundtrack, with Quentin and the other guy synchronising throttle blips so it looked like the noise was coming from the SFQ. ;):)
 
You must log in or register to reply here.
Back
Top