Motor Tachos

[leachy]

Hi All

I was wondering if anyone has had much experience with the one wire tachos, where the wire gets wrapped around the high tension lead of the spark plug. The wire senses the revs of the engine through induction as the energy travels down to the spark plug. I connected one up on Saturday to do some testing and try to sort out the correct prop size. The issue that I had was the engine seemed to start missing once I hit the higher revs 5500RPM and above. The only thing I could think of was the wire was causing the lead to break down and start shorting through it to some other point on the engine casing, down the wire I had wrapt around the high tension lead. It was working well below 5000 RPM, I know that the energy builds up in the spark lead when the revs get higher.

I could take the wire off when I was out on the water yesterday as I was in a fishing comp, could not waste time. Going out on the water this weekend with the family so just wanted to make sure all was good, no other problem before I got to the water again.

Thanks Leachy

[steve duff]

Matt,
Get onto bass boat central, ask the same question and watch the answers fly.

[leachy]

Why is that????

[steve duff]

These guy's do this day in day out in the states. bassboatcentral.com has threads for all info related to bass boats. post up on the site and these guys will get back with the right answers to your questions very quick.
cheers

[leachy]

Thanks

[ruski]

Matt,
Get onto bass boat central, ask the same question and watch the answers fly.

Steve,

This isn't Matt L...he's got a different username and he's on BBC.

Leachy, which engine are you enquiring about? 25hp Yammie?

Cheers,
Paul

[steve duff]

Cheers ruski.

[leachy]

Yeah I have the Yamaha CV25 on a Allycraft 395.

[ruski]

Hopefully someone can jump in and give you some advice soon