not rev'ing past7500

Twangled your powervalve grommit in your woodruff key? ask someone how to fix it here
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JanBros
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Re: not rev'ing past7500

Post by JanBros » Tue Jun 12, 2018 1:17 am

Marty_Rillo wrote:
Mon Jun 11, 2018 11:49 pm
Noo den mouser!

I have some info that may help.
Not guaranteed though!

When I first got my kr1s, then my electrician friend came round to solve some problems on it.
One of the screw ups he found was the stator and pickup wiring was butchered.
Thier are three wires from the pickup, and one or two go to the cdi.
The bike would start but wouldn't know where it was on the cycle, and as I wound on the throttle it would rev to around 7500 to 8000 and just brick wall.
It would also spit out a lot of oil fuel from the silencer!!
Matthew then swapped two wires in the connector block around and pop!
Off we went! perhaps the issue is in the wires telling the cdi what rpm it is like that?

Cheers Martin.
I would'nt trust your friend no longer when it comes to ignition's :cry:

every orinary pick-up like on a KR1 or any other bike with a CDI before there was injection only has 2 wires.
pick-up only does one thing : send a signal when the notch on the flywheel passes. If the engine runs, it automaticaly knows where it is in the cycle. making it run bad because of a wrong "timing/thinking where it is in the cycle" can only happen if the woodruf key has broken and the flywheel turned some degrees on the crank, or the pickup moved radialy (which is almost impossible).
You know it's cold outside when you trip over dog shit instead of standing in it.

Mouser
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Re: not rev'ing past7500

Post by Mouser » Tue Jun 12, 2018 7:21 am

Hi MArtin,

Thanks for your info !

It seems really bizzarre how this would solve the problem...as Jan says....but I'm willing to try it :)....the electrical on the KR1-S seems to bee non compatible with normal physician/electrical rules sometimes :)))))).

thanks
Mouser
Ps: Anybody remembers the voltage output of his WORKING rectifier.....still not sure if the 14.5V output of mine is reall too much...

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JanBros
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Re: not rev'ing past7500

Post by JanBros » Tue Jun 12, 2018 10:33 am

max regulator output depends on one thing : the battery. A 12V battery "in rest" is empty when it only has 12V, so it needs a lot more to charge up again. A lead-acid battery cell is charged when a cell has 2.1V . in a 12V battery, there are 6 cells so a 12V battery is charged when it has 12.6V in rest (measure this 24h after charging. if you have 12.7 directly after charging, but close to 12V after 24h, the battery is dead when you need it for an electric starter. lucky for us, that does not matter)

So all bikes with a 12V battery will have about the same output from the regulator. normaly 14.5-14.8 V (at +3.000 rpm) is considered the optimum, but as you go through lot's of service manuals, you'll see that up to 15.5V pop's up as max allowed.

Forklifts also have lead-acid battery's. for example an 80V battery has 40 2V cell's. The output of modern charger's go up to 100V, that is 100/40=2.4V per cell. 2.4*6=15V.

and yes, all 12V car/bike system's are developped so they can work with voltages from 11-16V so there's no problem there either.

so in long : your regulator works perfectly 8)
You know it's cold outside when you trip over dog shit instead of standing in it.

Mouser
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Re: not rev'ing past7500

Post by Mouser » Tue Jun 12, 2018 12:14 pm

Thanks Jan :),

That's an detailed answer :). Ok, so no issue from here probably...

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