Reply
 
Thread Tools Search this Thread
 
Old 29 February 2016, 17:58   #11
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,113
Quote:
Originally Posted by Stigomery View Post
Ah ha... that could be it...

It was a cheap 8 job off eBay and I don't recall any set-up instructions... will have a look tomorrow - thanks Poly!

Yes, tick-over is about 400 RPM
So I assume that works the same way as the tiny tachs. There is a setting for the number of revolutions per "spark", rather than "poles" on the alternator. Accessed by holding a button down for a while. The default is 1 spark per rev. I guess your Honda may have some fancy electronics so its only firing every second turn (only when fuelled, not on the exhaust cycle). On a tiny tach you'd set that to 720.
__________________
Poly is offline   Reply With Quote
Old 29 February 2016, 18:45   #12
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,275
Great video... and near flat calm... never been lucky enough to see that at Mersea... great for speed trials.

I'll be getting some sort of tach as I understand the Suzuki 20hp is very quick to hit the rev limiter and I'd like to be able to see a fast cruise just under that speed. The dealers will be able to see the rev-limiter info when they hook it up for service so don't want to be seen to cane it too much.
__________________

__________________
Fenlander is offline   Reply With Quote
Old 01 March 2016, 03:32   #13
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,691
Well done, great report.

Poly is spot on with the tach (I had one of those - it died pretty early. I think due to water ingress so might be worth trying to waterproof it a bit more) and they do seem to read at 50% - even when I thought it was set up as per instructions you had to double the reading.

If you're getting 5900 at WOT that is beautifully set-up.
__________________
Max... is offline   Reply With Quote
Old 01 March 2016, 03:38   #14
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,275
I guess it's easy to remember doubling in your head as you look at it but wonder if the hours are out too? I wonder about looking at a better/different one? Have you a closer image of your tach Stig or a link to which type it is.
__________________
Fenlander is offline   Reply With Quote
Old 01 March 2016, 03:47   #15
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,691
I think they're just the generic, cheap Chinese ones David - work OK for setting up a boat/prop/trim/engine but I would not rely on them for long term hours? The sort of boating we all do I guess it's easy just to note it down.
__________________
Max... is offline   Reply With Quote
Old 01 March 2016, 03:59   #16
Member
 
Stigomery's Avatar
 
Country: UK - England
Town: Cambridge
Boat name: SIBylle
Make: Honda Honwave
Length: 3m +
Engine: Honda BF20
MMSI: 235915576
Join Date: Oct 2015
Posts: 407
Click image for larger version

Name:	ImageUploadedByRIB Net1456822633.571634.jpg
Views:	100
Size:	19.7 KB
ID:	111030

See attached image. As noted it was a cheaply from eBay. There are no buttons so it cannot be adjusted.

Hours are accurate, 5 hours use is about bang on the money for this engine.

RPM 50%

I'll replace it with something more "complete" next time round.
__________________
Stigomery is offline   Reply With Quote
Old 01 March 2016, 04:03   #17
Member
 
Stigomery's Avatar
 
Country: UK - England
Town: Cambridge
Boat name: SIBylle
Make: Honda Honwave
Length: 3m +
Engine: Honda BF20
MMSI: 235915576
Join Date: Oct 2015
Posts: 407
This is it: TACH

Although mine was cheaper... there seem to be many of that design...

I wonder if I wrap both HT leads will it give me the correct reading?
__________________
Stigomery is offline   Reply With Quote
Old 01 March 2016, 04:22   #18
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,275
To best catch the eye of others who might not be reading this thread I've asked here...

Best Tiny Tach type
__________________

__________________
Fenlander is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 09:44.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.