Was your Tach/Hour meter not accurate ?

michael whiteman

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I thought my first meter was defective, but now the replacement acts the same way. Did you experience this ? You can set these for 2 and 4 stroke engines with one or two cylinders depending on your application. Mine is 4 stroke one cylinder. It idles at 4200 rpm and I have seen it over 14,000 rpm at 2/3 throttle. I tried all three possible settings, closet being for a 4 stroke 4 cylinder or 2 stroke 2 cylinder. Without a real tach for reference I feel my idle is around 800 rpm and the tach shows 1150 rpm. I don't have enough hours on this yet to feel comfortable at W.O.T. checking the governor. I'm not sure what that rpm is on a HauSheng f142, do you ?

After riding for 20 minutes the hour meter shows 0.3 which seems to be right on. Maybe you can check the tach calibration by means of the hour meter ??

One thing that confuses me.......this device has a clock timer built in, obviously. To create a tach all you do is count the electrical pulses to the spark plug. The computer does the math. You need to tell it if it's 2 or 4 stroke so it can count correctly. Here's the question: why do the instructions ask "how many cylinders" ? It only triggers off one plug wire. It shouldn't matter if it was a V-8 because, hopefully, all the cylinders are operating at the same rpm. Anyway, I would like to hear about your experiences and how you resolved them. thank you
 
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I know it sounds like a lot of work but you could math it out and check GPS speed to check the calibration of your engine. You'll need wheel circumference, gear reduction ratios, and a modern cell phone.
 
Well, first of all I'd need a cell phone, which I will never get. I was thinking about going to my local garage and having them hook up their Sun Diagnostic Analyser to get a true rpm reading. I used to have one back in the day. But you did have a good idea, thanks.
 
I'm not sure what your instructions are telling you but here's what mine is telling me. It's based of firing sequence per stroke and how to set it.
20210828_004947.jpg


The other parts of the instructions tells how to set up a maintenance schedule for the hour counter.
 
Yeah Jerry, basically the same as mine but worded a bit different. I tried all 3 possible set ups. Thanks.
 
Ok you basically have two four stroke settings. The firing on every revelation is the 2 stroke. The firing on every other revelation is a standard 4 stroke. The firing twice on every revelation is a 4 stroke with a waste spark firing on the exhaust stroke. This is done for EPA reasons on things like motorcycles.

With your engine you should set it to fire every other revelation.
 
I don't know about the EPA thing Jerry, but I have seen motorcycles that fire both plugs in a twin at the same time. It's a much simpler ignition circuit. One cyl. fires on the overlap position 180* off. I guess you could use one of these meters on a MC. Didn't think of that.

Never-the-less, I have tried all 3 possible settings. Do I chalk this one up to a cheep Chinese design on this particular brand ? or buy a different more expensive meter ? I think I'll try to see how far off my current readings really are.
 
I use mine on my mower and weedeater. It worked really good for that purpose. The one I have on my bike I got from David Staton over 11 years ago.

I'd try the every other revelation sequence and see what it does.
 
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