The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: WozzA on 04.12. 2018 09:16
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Is there a EASY method to replace the centre stand spring on a plunger? *????* *doubt*
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Yep- but I forget the details.....I think is best if the stand is in 'up-ish' position where the spring is shorter, and use a thin piece of flat bar that'll fit between the eye of the spring, and slide it up the bar till 'just right', and use the home-lug as a fulcrum, and stretch the spring with the rest of the bar and slide the eye down the bar to the lug.....I think..... *dunno*...it's a while since I discovered that method by accident, and I think the stand was in the 'down' position *conf2*, but however it was, it was tooooo easy
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Yes make a spring stretcher.
Easiest one is made from 2 turnbuckles, OR one turnbuckle & a eye bolt.
Bent the eyes over 90 deg then cut a slot in both of them
Slip the spring into the slots so the eyes of the spring are free.
Undo the turn buckle to stretch the spring then slip the eyes over the anchor points.
Easier if one is on an anchor point first
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I used a large cross-head screwdriver to stretch/slide the spring along and on to the locating peg.
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is the plunger spring that different from the swingarm spring? I know their shape/end is different, but as a spring i've had a fair run from putting the swingarm bike on the centre stand and pushing the spring sideways into an arc to fit washers between many coils. then take the bike off the stand and the spring stays long enough to remove. fit new one by adding springs to the arced spring held in a vice, and fit on side stand (if you have one). would this work on the plungers? i learned this from this forum.
btw the turnbuckle idea sounds better long term - i may make one eventually
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is the plunger spring that different from the swingarm spring? .......
Fairly much completely different and attaches in the middle of the cross-brace....I tried the washer method but it went to shit.... that's when I did my above method.... forgot to say 'attach to the top lug first '...
The spring will probably be longer when the stand is down, on both mine they are at least, so much easier when stand is up
(Compare length measurements up/ down)
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10 minutes to fit the stand... 4 hours later the Bloody spring is STILL not fitted.. *rant*
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G'day Woz.
You could try removing the c/stand, attach the spring both ends and use tyre levers to lever it into position. I've done that on a few different bikes but not my plunger.
Cheers
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Well here is another spring stretcher I pinched off the web.
Can't find mine right now so it is probably out on loan to some one
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I used a large cross-head screwdriver to stretch/slide the spring along and on to the locating peg.
Or was that the side stand?
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10 minutes to fit the stand... 4 hours later the Bloody spring is STILL not fitted.. *rant*
What methods have you tried ?
Edit 1 hour later; I'm fairly sure it only took me about a minute or two with no real fancy tools...I can't accurately replicate the action because the spring has since broke and I've done a bodge fix and it's now a few mm longer....
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Have you tried using a rachet strap ?
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10 minutes to fit the stand... 4 hours later the Bloody spring is STILL not fitted.. *rant*
What methods have you tried ?
Edit 1 hour later; I'm fairly sure it only took me about a minute or two with no real fancy tools...I can't accurately replicate the action because the spring has since broke and I've done a bodge fix and it's now a few mm longer....
I attached it at the top mount hole & used the screw driver to wedge it down over the bottom mount.. No Good... then I bent the spring over in the vice & inserted washers on both sides.. ( it looks like a Christmas tree ) & tried wedging it again.. it's still not long enough.. This spring from Brett is 150mm long & for the life of me it wont stretch to approx 170mm.. it's one tough spring.. *rant*
I'll try Muskys method of attaching it first then wedging the stand tomorrow...
Failing that it will be a spring expander like Trevor's
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Here's my version of a spring expander I made to fit the rear stand spring on the m21. Alongside is my fork stanchion tool. Both were knocked up quickly using stainless.
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Hi All,
I have fitted quite a few centre stand springs by, hooking the spring on the frame end and tying some strong wire to the other end Then tie the wire securely to the rear wheel, so turning the wheel stretches the spring
Then swing the stand up to engage the peg to the spring
John
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I'm sure that this spring is so strong it would rip all the spokes out using that method.. *eek* I kid you not... it's super strong... *pull hair out*
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Is there a EASY method to replace the centre stand spring on a plunger? *????* *doubt*
I tried all the various methods, but eventually gave up and made this. It works well enough to have been borrowed. The design is specific to the spring/stand (edit: swing arm) to ensure you can stretch the spring and then slip the ends over the 2 attachment points.
Some springs take a lot of force to stretch em *work*
Edit: to get an idea of the scale, I used 10mm threaded rod, the nuts are 16mm across flats.
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Hi Wozza,
The first time I did it was on a Commando, you could hang the World on one of those springs *eek*
Keep the wire tight to the rim, so pressure will not bend the spokes
John
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Ok so I lost sleep overnight on this, and as I have nothing better to do today than fix more things that I've not yet broken *work* *work*, I figured I better check my (false) facts..... first- the last thing I discovered is the spring is *SHORTER* in the *DOWN* position..... after I took the spring off and measured it... like I said, it broke so I bodged it and in the down position is actually swinging loose (as per pics) *note to self/ shorten *, and is about 15mm longer than yours and I had a feeling that I first did it in the' down' position.... which makes it easier to use my ruler method (In theory)
Yep- I'm full of it *red* *doh*
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A real man would just pinch the end between thumb and forefinger and pull it on.
Richard L.
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G'day John.
That's a great idea I never thought of.
Cheers
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...A real man would just pinch the end between thumb and forefinger and pull it on...
Well I did- but had a slight advantage *whistle*
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inspired by this thread i just made the spreader in the pic. to fit springs on the a10 and the plunger b33 by going on the side of the spring. and i put that big fat jappa spring (second pic) on the a10 (swing arm) so it no longer clangs around.
still easier to get the springs off with the 'washer method'
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inspired by this thread i just made the spreader in the pic. to fit springs on the a10 and the plunger b33 by going on the side of the spring. and i put that big fat jappa spring (second pic) on the a10 (swing arm) so it no longer clangs around.
still easier to get the springs off with the 'washer method'
Hi Mike, I'l bite! where do you fit that "jappa" spring (as you call it)? *dunno2*
Peter
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jappa as in off a japanese bike from a wrecker. in place of the stretched a10 spring. its wider gauge than the original so i hope it doesn't fall off the upper peg. 3/8" shorter at rest
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*smile* I spent a couple of hours in the shed today making EXACTLY the same type as Mikes. and also discovered the previous owner had welded the side stand fixing point on backwards. *dunno* It folded FORWARD but only came a short distance backwards.. *problem*
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Mike will that jappa spring stretch to 185mm that is what it has to do for my A10 SA?
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so far it appears ok - see pic. when on stand (as in the pic) its stretched to about 160mm, so i guess is a little longer temporarily when putting the bike on the stand. it only went on today so only a few test trials to comment on - it isn't deformed yet and it holds the stand much firmer to the frame when up than the proper a10 spring did. again, this is a swing arm a10 (sorry if this is becoming a thread hijack)
i asked the wrecker for a honda 500/4 spring and he gave me a box of random springs to rummage through. so no idea what its from. time will tell if it lasts the distance.
and the spring stretcher above made it easy to fit
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G'day Mike.
Does he have the rest of the 500/4?
That's it I'll make one like that tomorrow. Useful on all bikes and other things (bed springs, I keep breaking them *smiley4*).
Cheers