Anything Goes! Build-from-scratch Dutch minibike 4.0

Mini Bike & Go-Kart Parts

Build from scratch Dutch minibike

  • yes

    Votes: 19 95.0%
  • No

    Votes: 1 5.0%

  • Total voters
    20
  • Poll closed .

desert rat

Well-Known Member
#63
In the video you ask what could be causing the deviation in the tach. Have you used that same type plug wire before? I have 8mm stainless MSD plug wires on my '77 MGB. The state testing center made me take them off because their test machines could not read them properly. I had to have carbon core wires for the testing. May be the same thing.
 

Li'l Popeye

Well-Known Member
#64
In the video you ask what could be causing the deviation in the tach. Have you used that same type plug wire before? I have 8mm stainless MSD plug wires on my '77 MGB. The state testing center made me take them off because their test machines could not read them properly. I had to have carbon core wires for the testing. May be the same thing.
I have solid core wire currently, with the original wire and plug cap I had the same problem.
Have not tried the carbon core wire.
 
#65
That's F'ed up !
The emissions testing format in Co, is one reason why I left ,, before they could get their hands on my Porsche 944S,, & violate it with sliding the rear of it back & forth on the Dyno rollers,, while going thru all the gears on a road simulation. :eek::rolleyes:
 
#67
Coming weekend I'll be testing the tach with a resistor in the signal line.
If it works out ok or anything else it would be nice.
Is that an NGK 8mm wire ? It's hard to tell ….
For kicks & being in the Netherlands,, do you have any ''7mm'' Bosch wires to try ?

Might get a better ''accurate'' reading with a 7mm anyway.
''Smaller wire generally has more resistance''. ;)

See that you are a fan of yellow wires like me.

I really like ''Accel'' carbon core, 7mm ''yellow'' silicone wires,, & have made up a ton of them over the years,,, with very good luck.
Not sure if you can get those there or not.

P/S,,
Your build work is extraordinary !! :)

I
 
Last edited:

Li'l Popeye

Well-Known Member
#68
I have 8mm and 7mm wires. All solid core. Also have MSD 8,5mm wire, but they are very fragile and have lots of resistance. Superconductor wire, I believe.
The original Honda wire and boot also has resistance build into them. I have tried the original wire and boot, but that didn't help. So I assume the signal is not messed up because of the sparkplug wire resistance. Just a signal from coil that gets messy at higher rpm's? With messy, I mean that the tachometer can't handle it. Engine runs great.
 
#69
You might be on the right track then with a small inline ''signal wire'' resistor.
Might have to play around with a few different ohm variations a bit though …
Let us know what you come up with .;)

I
 

Li'l Popeye

Well-Known Member
#70
Untill now I have tried different resistors up to 75 kOhm, without any results. I have also tried a hall sensor for picking up signal. Also gave the same result, so dirty signal is picked up somewhere else, I guess. I also tried routing wires separate from each other, again without results.
 

Li'l Popeye

Well-Known Member
#72
I think its a bad tach . Check this out see if there is something else you can try before you condemn the tach to the time out corner. https://www.digitalguarddawg.com/hrf_faq/how-do-i-test-to-confirm-i-have-a-good-tach-signal/
I have done that. It has about 9-10 v on the killswitch wire. Which is signal wire. It goes up with rpms.
I can try to swap my juggernaut driver with driver of other minibike. And see if that tacho also misreads afyer 5000 rpm. Now it doesn't reach 5000rpm..
 

Top