Triumph Scrambles Cub replica - a short ride running off battery with charging system disconnected.
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- เผยแพร่เมื่อ 9 ก.พ. 2025
- I took this ride to try and confirm the charging side of the electrical system is what stopped this machine near the end of a ride yesterday and it would seem to suggest my suspicions about the alternator and / or Powerbox reg / rec may have some merit after all.
Bloody hell, sounding good. First time I.ve wanted a cub. 👍
Going really well you gave her a good italian tune up no cobwebs there now .Alan Northern Ireland 👍
Thanks - I am going to re check the timing, as I feel it has more to give, yet!
Another sunny day in Wales, triumph goes well.
That's flying! Seems to be revving more freely, making short work of those hills!
Thanks!
G'day Paul, hope the gremlins stay away for a while, the bike ran well a bit more advance on the timing hopefully will help, cheers mate, Neil 🤠.
That little cub motor on song now Paul!!
Thanks - it is getting there for sure!
Use to run my bsa b25 back in the day just on battery ignition disconnected the alternator and removed the stator engine a great deal more lively as it wasn't driving it only good for 1 hour or so
Hi Paul. I am not sure I heard correctly. I had both a Honda TL 125 and a TL 250 with the same problem, bad coils. Thanks for all you do.
Thanks again, Herman!
Can you check the resistence of the alternator two wires? There should be a listed Ohm reading for the alt windings....will also tell you if there is a short circuit there. With engine ruunning, can you measure the AC output from the alternator? Should rise to 30-60 V-AC with revving up. If the power box has a built in capacitor, can you test it by applying power from the battery to the box, then disconnect the battery and wait a few minutes, then test for voltage coming out of power box? Should get 12-14V-DC for at least 5 minutes or so (this is what my Commando does with its external 2MC capacitor)
Have you much experience with the air choke on the amal with your cubs? Acquiring the cable and lever now for instaĺl on my ts20
The only Cub of mine which has a choke is my 1958 model with the Zenith carb. It might be a bit tight for space if you have a Monobloc and I don't think they had a choke when fitted to Cubs originally.
Hello, Paul! I've been following the saga of this little bike, and this thought just came to my mind. Many years back, I had a British twin which ran the Lucas ET ignition system. It proved to be the most durable and dependable of any of the various Lucas products with which I have had experience. Could the components for the ET system be fitted up to the Tiger Cub without need of expensive fabrication of special parts and adapters? The expense for components might not be greater than the cost of a new stator and power box, and since you are not running lights, might be a nice option for ignition. ???
No push = Good run! You may be on to something with the stator!👍
Thanks 👍
👍
That's put a few items to bed. I hope, if the Powerbox has over shunted, there hasn't been any alternator field winding damage.
With the powerbox, when there is excess voltage to deal with from the alternator, it shunts/shorts the two wires from the alternator winding, making heat in the the winding. Perhaps there has been an excess amount of heat in the winding causing some damage? Unsure why the battery got hot. That would only happen if it was getting overcharged...ie the powerbox no longer limiting the voltage on the system. I once had a battery bloat up when a zener diode gave up and was no longer regulating voltage to less than 14.8v. This was shortly after fitting LED headlamp on the bike, so a lot less power consumption than the zener would normally deal with....making the zener do more shunting to earth and itself getting hotter than usual.
@@TornadoCAN99 Thank you, might have survived, fingers crossed.
Paul was the coil very hot?
I don't know, to be honest, but the battery was after it packed in altogether.
Paul, compare the points cam profile with your other side points bike, take a pic.
The 5 deg auto advance had a long closing duration used on the energy transfer system.
@@paulhenshaw4514 That means the battery was being over charged, correct? I had one bloat up when a zener diode stopped controlling voltages below 14.8 v....happened shortly after fitting LED headlamp, meaning less power needed, making the zener work harder to keep voltages in range. With a powerbox, to control voltage, it shunts/shorts out the two wires from the alternator until voltage is reduced to the required range....this does place some added heat into the altermator windings...so maybe this got too hot and has done some damage?
Dud alternators just short out or get severed wires & quit charging. This seems like the voltage regulation part of the powerbox is playing up. You might fit a different (known to be good) one and return the other to be tested - for your own peace of mind.