Engine Tachometer for carb adjustment (86 spree nq50d)

[kanderson4893]

Hey so I apologize if this has been answered but I've searched the forums, wiki, and service manual.

What tool do you use to measure engine speed when adjusting the carb?

Is there a specific tach that needs to be used for the spree? It's a 1986 spree NQ50D A if that makes a difference.

Also where do you hook it up and how?

I've been trying to adjust carb by feel and sound at what I think is 1800 rpms but I don't think I'm getting close enough.

For reference, this is my first carburated motor but I am fairly mechanically inclined (everything I've worked on has had a working tach). The scooter is running and driving at stock settings after doing a carb clean but I get the occasional bog on acceleration after cold start, feels like the mixture screw is slightly off but I can't quite find the right spot.

[Wheelman-111]

Greetings:

I have one of THESE mounted to each of my Vespas. Works great. 2032 battery lasts a couple of years and easily replaced if you mount with sticky Velcro. You do have to disassble some plastics to reach the spark plug HT wire, wrap the little red wire 5 times around and secure with included mini zip-ties, done.

On the other hand, you would be well-equipped to add a temp gauge if you plan to do any modifications/upgrades. In that case, SSS (above) can sell you a Vapor by Trail Tech. This includes, tach, CHT, and a speedometer you can calibrate to considerably greater accuracy than the ever-hopeful Spreedometer.