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Old 04 May 2010, 07:45   #1
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RPM meter on Suzuki 4stroke

Hello Ribbers.

unfortunately I don't got a rib, but I visited this site much when I had a Sib. I bought a little (4.10M) Hoga Rodd console boat with a suzuki DF15. The set is from 99, but looks like its new! It also got a RPM meter, original from suzuki. But now the problem:

I got the idea that the RPM meter dont show the right RPM. it shows a max from 2800RPM. Im now not sure if it is the engine who runs slow(dont got any comparison, or people arround with a knowledge/boat) or the meter who shows about the half of the true RPM.

I got a movie when sailing at full speed, maybe you people could hear if this is more than 3000RPM?






thanks!
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Old 04 May 2010, 08:19   #2
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If I remember correctly ther is a tiny switch on the back of the speedo which allows you to select the number of cylinders in your engine. It may be that it is set incorrectly?
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Old 04 May 2010, 08:41   #3
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Thanks for the reply!

Im not sure if the swich is there, but I would give it a look! i think it have to be somethink like that, or a swich for 2stroke and 4 stroke. or would a 2 stroke meter give more rpm when used on a 4stroke.
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Old 04 May 2010, 12:22   #4
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If you have access to an automotive inductive tune-up meter, you can clip that over a spark plug and get an rpm reading.

Sounds like your tach is set up to read a 2-stroke motor (which sparks every turn of the crankshaft), rather than a 4-stroke (which sparks every other turn.) This causes your half-rpm reading.

jky
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Old 04 May 2010, 12:48   #5
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what does it read at tick over?
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Old 04 May 2010, 22:41   #6
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Doesn't sound over 3000 rpm to me. It certainly isn't 5600!
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Old 05 May 2010, 02:49   #7
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It reads about 300-500RPM (difficult to say cause its analog). But I have to say the engine is adjusted to a low tick over for smooth shifting. but am not sure if it really runs that slow! its just so difficult to tell on only the sound. i live in a not water/boat area, so there are no dealers arround.

Dont have acces to a automotive inductive tune-up meter.

When the weather is good I get the boat tomorrow from where its stored. Than i could take a look if there is a swich on the back of the meter.

Thanks,

Bastiaan

p.s. The DF15 normal rpm operating range is between 5400 and 6000Rpm
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Old 09 May 2010, 09:22   #8
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Friday i looked at the meter and found a little switch to determite the number of poles. It was switched on 12P. When looking in a manual of a suzuki tachmeter I think the correct setting for my engine is 6P. Did not had the oppertunity to test it but i think this was the problem. When switched on 12P it would half the total RPM the engine really turns.

This is the Manual: http://members.home.nl/glaerox/boot/...tachometer.pdf

When looking on the last page there is a table for the right setting. I think the right one for the df15 is the 6P setting? I try to understand the manual but some things in englisch ar hard to read.

thanks.
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Old 09 May 2010, 09:53   #9
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Quote:
Originally Posted by Glaerox View Post
When looking on the last page there is a table for the right setting. I think the right one for the df15 is the 6P setting? I try to understand the manual but some things in englisch ar hard to read.
You are reading the table correctly.
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Old 09 May 2010, 09:56   #10
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DF15 = 6 pole setting
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