Acewell Tacho "Issue"

[Duckndive]

Ok so while scrolling thru the various screens i noticed that the is a miss match on the RPM readings ...

Anyone else had this or know the solution ? 

[SiBag]

I would suspect its because the firing uses the lost spark, so the tacko is seeing twice as many pulses as it needs. Just a guess, but sort of makes sense.

[Duckndive]

1 hour ago, SiBag said:

I would suspect its because the firing uses the lost spark, so the tacko is seeing twice as many pulses as it needs. Just a guess, but sort of makes sense.

Thanks

So why does the needle not read the same as there is only one tacho feed to the unit  

Edited August 18, 2025 by Duckndive

[Gixer1460]

depends on which unit you choose - most will have setable settings to allow use with 8, 6 or 4 cylinders, with or without wasted spark - Dyna2000's for example can either output 1 or 2 pulses per rev to suit various tacho's - obvs getting a mismatch will give half, correct or double correct reading!

[Dezza]

19 hours ago, Duckndive said:

Thanks

So why does the needle not read the same as there is only one tacho feed to the unit  

Does the unit have different settings for different engine configurations? My Koso and Daytona clocks both have this, so make sure a starting point is 'four cylinder four stroke.' However, there can also variation in the setting needed according to the nature of the ignition pick up within engines of the same configuration. For example, a bike with a B12 ignition will need to be put on a different setting to one with a slabby ignition.

[Duckndive]

57 minutes ago, Dezza said:

Does the unit have different settings for different engine configurations? My Koso and Daytona clocks both have this, so make sure a starting point is 'four cylinder four stroke.' However, there can also variation in the setting needed according to the nature of the ignition pick up within engines of the same configuration. For example, a bike with a B12 ignition will need to be put on a different setting to one with a slabby ignition.

Yes there are numerous settings ...

the point is why does the digital read out on right read near double the analogue "needle" on the left....

There is only one wire to the unit taken from the ECU tacho feed as per the destructions  and using the suzuki wiring diagram from the OE manual   

[Gixer1460]

Maybe the analogue one is configured to only accept one pulse whereas the digital is taking the two pulses so reading double? Does the engine sound like 1000rpm or 2000?

[Duckndive]

20 minutes ago, Gixer1460 said:

Maybe the analogue one is configured to only accept one pulse whereas the digital is taking the two pulses so reading double? Does the engine sound like 1000rpm or 2000?

1000 rpm ...

i,ve emailed acewell to see what they say 

[coombehouse]

17 hours ago, Duckndive said:

1000 rpm ...

i,ve emailed acewell to see what they say 

I have the same model Acewell but I haven't used it yet. I will be interested to hear what the answer is in case I get the same issue.