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I can do that for the tach, and I will, but with a centrifugal clutch it would be very inaccurate for mph.

Runs beautifully once it warms up. I think I will try and go for the hearing, thanks!

Is that just because of lower power? Currently I have 7hp, only go like 14mph, and my kart is relatively light. I feel like power would be plenty. The kart weighs ~200 lbs. ~300 with me on board. Theoretically it would change when the clutch grabs, but currently it sometimes wants to start...

I am not sure if this is considered double posting, if it is I am sorry. What if I bolt the magnet on? Would that make the balance worse? With some thread lock it should stay on.:huh:

The gps is normally super inaccurate for me.

Centrifugal, why would that be problematic?

What if I measured to ratios from the output shaft to the wheels and used the tach reading to calculate speed? It would vary based on small things like wheel PSI. The Miata tone ring sounds good, but a little out of my field. The tach speedo would be inaccurate at low speed from centrifugal...

What if I got one with a hole through the middle that can be bolted on? Would that then make the imbalance worse? I would need to put a hole in stuff. Then I couldn’t do a tach either. Optical would get covered in dirt I think. What would you do?

What if I get one that can be bolted on?

I want to make a small Arduino based tach/speedometer for my kart. If I just put one light neodymium magnet on the driveshaft/output shaft would that screw up my kart? It would theoretically, but mine already shakes like crazy because I go off-road with it. Any thoughts?

Thanks, that all makes sense!

Sure! I am in highschool, for privacy I want not to go into more detail. I have a go kart I found on marketplace. I have no clue what the frame is, it appears to be a kit. The engine is a Subaru ex-21. I am decent with tools, and I am in a club for small engines at my school. I am decent with...

I originally joined to ask one question, but after digging deeper this seems like the perfect forum for me! Thank you all for making this such a cool place!

For some context I have a Subaru EX-21 on a off-roadish frame I got on marketplace. I am in an area somewhere between urban & suburban. I enjoy drifting it so I need torque as well. I normally don't have much more space than a parking lot, so I can't really go ripping around. My dad also doesn't...