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ET: Engine (Twin) Electronic Rev Counter

ernie

Well Known and Active Website User
VOC Member
Anyone with experience of fitting a Smiths electronic tacho to a twin with a Lucas Magneto please?

Ernie from the Magnificent Severn.
 

Nulli Secundus

Well Known and Active Website User
VOC Member
VOC Forum Moderator
Anyone with experience of fitting a Smiths electronic tacho to a twin with a Lucas Magneto please?

Ernie from the Magnificent Severn.
I asked a similar question Ernie on a Facebook group page, but in my case for an Acewell electronic tacho. Only one guy responded and said he uses Smiths electronic tachos on his magneto equipped bikes, but uses one of these rpm signal filters. I cannot personally say that it will work. I did not buy the Acewell in the end.

 

vibrac

Well Known and Active Website User
VOC Member
Why not ask acewell l asked a Q on Friday night got replys on sat and Sunday see my thread on Egli Comet last month.
I fitted magnet on trail bike and Egli by utilising tyre security bolt hole
 

Nulli Secundus

Well Known and Active Website User
VOC Member
VOC Forum Moderator
Why not ask acewell l asked a Q on Friday night got replys on sat and Sunday see my thread on Egli Comet last month.
I fitted magnet on trail bike and Egli by utilising tyre security bolt hole
I did and they very swiftly (late evening on the same day) answered all of my numbered questions, apart from the one whether it would work with a magneto, or an electronic magneto like a BT-H. I had provided them with information on the BT-H as well.

I then replied to their email and tactfully suggested they could perhaps test one of their rev counters on say a 4-stroke lawnmower. This clearly 'fell on deaf ears' and I can only assume they are perhaps struggling with the concept of a self generating ignition system (even though their lawnmowers, if they own one, have them) and presumably have the luxury of not wishing to expand their potential customer base.

The Acewell was just too expensive for me to take a punt on without knowing whether it would work OK.
 

Little Honda

Well Known and Active Website User
VOC Member
Ernie,
you certainly have an ignition spot light which can be used to check, if there is a spark under compression with
magneto ignition. This impulse should be useable for a tachometer feed. You may even try it out with yr spotlight by connecting the two contacts for the bulb with yr tachometer. It should indicate while pressing the
button of the spotlight while the engine is running. The detail fitting is your turn...
 

Albervin

Well Known and Active Website User
VOC Member
Check out the Scitsu site. They make many different types. At the moment I am testing one for a twin plug Puch 2 stroke twingle. They seem very receptive to feedback and their prices are fair. If the unit on the Puch stays then I will buy one for my BTH twins. The plus is they can be powered by a self contained battery so suitable for a 6V and 12V bike and can be transferred between bikes.
 

Roslyn

Well Known and Active Website User
VOC Member
Why have a rev counter ? just another thing to distract you from riding the bike and go wrong? and you are not supposed to over rev a Vincent any way? and why fit clocks usb ports and gadgets to old bikes if you that is what you want why not just buy a new modern motorcycle and it all built in no messing about with unnecessary wiring and hassle just get out there and ride the bike and enjoy life
 

timetraveller

Well Known and Active Website User
VOC Member
I like a rev counter. I have one on all my bikes and my car. I also have a car alternator to give me all the watts I could want, modified front and rear suspension, modern tyres, flashing direction indicators, a twin start oil pump, modified valve lifter boss and clutch to prevent oil leaks and more. My bike, my choices. When I get too old to remember where I am going then I will have a 12 volt fed USB port to power a smart phone to act as a sat nav. Remember, your bike your choices, my bike my choices.
 

Roslyn

Well Known and Active Website User
VOC Member
using a sat nav and phone not very safe on a bike better to keep your eyes out for those boxes on four wheels with a moron using a sat nav and phone etc as they are not looking out for you as more car drivers now stop then turn then use indicators if you lucky why because they are much to busy using a hands free phones etc. I have caught some with a action camera, hands free drinking a coffee and using a phone at the same time yep they are still out there trying to kill some one.
 

Mike 40M

Well Known and Active Website User
VOC Member
A Scitsu with inbuilt battery is not a good idea on a road bike. It is very good instrument on a racebike where you can charge it from a 12V battery for 24 hours between events. Don't know exactly how long it works without recharging. A month ago, three hours racing in a weekend, no problem.
 

Gary Gittleson

Well Known and Active Website User
VOC Member
Disclaimer: I'm squarely on the "reasonable upgrade" side if this discussion. I don't yet have a rev counter but am thinking about it. So here's my question.

The Smiths electronic tach should be easy in my case, since I am using the D distributor on my D bike, albeit with a Dyna points booster. Are there any opinions out there about the quality and reliability of that tach? It's a bit pricey, so one hopes it's not junk.

And I do use a Sat Nav on the bike with Bluetooth earplugs so I don't have to look at it.
 

Glenliman

Well Known and Active Website User
VOC Member
I have one of the Smiths electronic tachs on a Rapide with dual point dual coil ignition.
I had plenty of problems initially. After working perfectly for about 2 weeks and a thousand miles it went haywire, very erractic.
All advice from the manufacturer was that I had wired it up incorrectly.
That wasn't the case, diodes in the tach were fried.
All fixed under warranty. It's been working great for a couple of years now. They are a bit complex to install and calibrate.
I like having a tach, kind of miss it when riding the tachless Rapide. Why have a tach? It's a question like " Why have a Vincent?"
You don't really need either item.
Satnav with Bluetooth audio saved our lives in Manchester in 07.

Glen
 
Last edited:

vibrac

Well Known and Active Website User
VOC Member
The only time I needed a Tach on the road was when I had a 1951 AJS 7R Registered for the road I had to memorise the revs for first and third for the only limit that mattered back then 30MPH.
But anyone with a bit of mechanical sympathy likes to know what the mill is churning at.
 

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