Help Request from England

1. offizieller Beitrag

    Hi,


    I've got a 1975 KR51/1 which is a very rare sight over here and gets more attention than my liquid-cooled 221cc Vespa when I ride it to scooter rallies!


    However, when it gets warm, the engine starts to lose power and cut out.


    This normally happens when I stop in traffic, but it has also started to die while riding along.


    I've checked and changed the plug, and I guess the spark plug cap and HT lead are next, but after that.......?


    I had changed the carburetor recently but re-fitted the original one because I could not get it to idle with the new one on, and the engine is completely standard as far as I know.


    Any help would be greatly appreciated, thanks.

    Hi!


    I suggest checking the ignition system. Especially the capacitor and the interruptor (?) tend to get faulty, if you do not have an electronic ignition.


    Also, while the motor is running, do you see any white smoke coming from the exhaust?

    Hi,


    Thanks for the quick answers...


    No (excessive) smoke when ticking over, but my girlfriend says that it was smoking while I was riding it on Sunday, and I was treating it gently.


    How hard are the seals to change?
    I'm pretty experienced when it comes to Italian scooters, but getting oily with the Schwalbe will be an adventure - especially as my only source of reference is Das Schwalbe Buch which I can't read!!!!

    • Offizieller Beitrag

    Changing the seals in the old M53 Motor means, that this requires a complete disassembly of the motor.
    It wolud be more than helpfull to be able to read the Schwalbe Buch.


    Peter

    Actually, you would need quite a lot of tools. Especially, you would need a device to pull apart the two parts of the motor:
    SIMSON MOTOR TRENNVORRICHTUNG VORRICHTUNG M53 / M54 S50 SR4-2 SR4-3 SR4-4 NEU!! | eBay
    Those devices are sometimes on ebay for less then 20 Euros. Search for "Trennvorrichtung M53".
    Also you need to disassemble the ignition, so you will need the tool to remove the magnet wheel, and maybe 3 to 4 more tools.


    You might want to think about sending the motor to a (german) professional who will regenerate your motor. That would cost you about 200€, which is probably less then a set of special tools and the needed parts (bearings, sealings, washers, lock plates and so on).


    Still, before starting to get expensive, you might want to get back to the ignition and exchange the capacitor and interruptor for new parts.

    ok, brilliant, thanks.


    My Girlfriend is German, so we're over there quite often.


    I'll try the electrical parts (HT lead, spark-plug cap. capacitor and points) and hope for the best.


    If it's going "home" for surgery it might get a little money spend on making it a little more practical (faster) too.


    Any recommendations on a good Schwalbeschrauber around Stuttgart (or wherever) and a good set-up for this motor - bigger capacity to-end, expansion chamber (auspuff) etc?

    Hy,


    there are certain board rules you need to follow and asking questions about "how to get it faster" are barely answered. This board is all about authenticity and originality - so any technical-related questions are more then welcome... just fyi, before someone closes this thread :)


    cheers

    Hi Stöpsel,


    Ok, no worries - I was thinking more of a larger "standard" capacity top end than any radical changes, but a 50cc scooter on English roads isn't very safe and I would rather ride it than keep it in the garage and look at it now and again.


    The bike always draws a crowd over here because it has had a lot of time and effort spent on it since we bought it - it was in a very sorry and unloved condition.
    This has included a complete respray and a handmade custom seat, not to mention new cables, wheels, etc etc etc and a new home in a carpeted garage....

    This is nice, and it it good to hear that the old scooters are liked in england, too. Nevertheless, in this forum questions about "tuning" your motorcycle are not being answered, usually the corresponding threads are closed immediately. There are other forums discussing these things. Still, if you need help to repair your bike in a "standard" way, we are happy to help you :)


    Just for the interest: Where/How did you get that bike, and how did you bring it over to england?

    Hi,


    I've been riding Italian scooters since the mid-1980's and first saw a Schwalbe in Bielefeld when I was visiting Sandra, my girlfriend.


    I really liked the look of the Schwalbe, and before she moved to the UK, Sandy bought and restored mine for me as a present - she was a scenic painter in the theatre, so the standard of the restoration is very good.
    The Schwalbe made the move to the UK last year in a van, and I've taken it to a few local scooter events where it's been really popular.


    Riding it always brings a smile to my face, and I'll try to solve my problem here first, but failing that I could still do with a suggestion on where to take it for a rebuild near Stuttgart.....

    first of all: nice to hear that at least one of my beloved little smokey birds is humming around your neck of the woods!


    as mentioned above, to be able to work on the ignition you will need a pulling tool for the flywheel. this thing is called "polradabzieher" in german. in case you don't have that thing i strongly recommend buying one. i have been using points-style ignitions in my two scooters and needed it quite a lot. please do not use a puller (?) of this type

    as it will most likely turn your flywheel "inside out" and make it become unbalanced.


    please be aware that there are several different versions of capacitors available. a general rule of thumb is: the cheaper the more crappy it is. in an other thread here at the nest some users tried to find out which ones to avoid, sadly the thread has not come to an end yet. just search for "kondensatoren thread" if interested, i think it is also linked in the "best of the nest" section. personally, i have had no issues with german-made capacitors with a glossy, slightly beige insulation which i bought at dumcke.de.


    here is a how-to on changing the capacitor: Kondensator aus/ einbau / funktion while i don't think you need to be told every single step when you manage to build a heavily modified vespa, it may contain some useful information. for example the one that capacitors are very fragile and tend to break when you overtighten the central contact..


    peter (zschopower) has designed this neat tool that enables you to check the actual state of you ignition capacitor: http://www.schwalbennest.de/si…sator-pruefung-91208.html


    one more quick word on increasing displacement: of course you can do whatever you want to your bike. just don't write it down somewhere around here, since the moderation team does not like that and will close your thread. in fact, i do believe that this one is only still open either because someone was too lazy to read english or, more likely, you got an extra bonus to set an example against certain prejudices about us germans :mrgreen:


    edit: i believe there is a simson workshop in stuttgart called simson strauch or stauch. i have not dealt with this particular guy and can therefore not tell you wether or not he is any good.


    Zitat

    The bike always draws a crowd over here because it has had a lot of time and effort spent on it since we bought it - it was in a very sorry and unloved condition.
    This has included a complete respray and a handmade custom seat, not to mention new cables, wheels, etc etc etc and a new home in a carpeted garage....


    don't you tease us - show some pictures already :bounce:

    • Offizieller Beitrag
    Zitat von moeffi

    in fact, i do believe that this one is only still open either because someone was too lazy to read english or, more likely, you got an extra bonus to set an example against certain prejudices about us germans :mrgreen:


    It's the bonus-thing. But even that will not last forever. ;)


    So let's concentrate on bringing that bird back on the road.

    Hi,


    Thanks for the advice again, I'll definitely try to get it back on the road and have a look at the electrics frist.


    Anything above that I'll send it home for a rebuild - I've a large collection of special tools for Vespa's which have only been needed once!


    That's also for cutting me a little slack on my capacity increase question, as you quite rightly say, the main point is to get it back out on the road!


    I'll try to post a before and after pic, but it might have to wait until I'm home for that one...


    Thanks for all the good advice, it's been very much appreciated!


    Dunc'

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