RPM meter on Suzuki 4stroke

Glaerox · 04 May 2010, 11:45

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?

http://www.youtube.com/watch?v=RDIQrTbTFBA

thanks!

Cypman · 04 May 2010, 12:19

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?

Glaerox · 04 May 2010, 12:41

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.

jyasaki · 04 May 2010, 16:22

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

Poly · 04 May 2010, 16:48

what does it read at tick over?

Screaming04 · 05 May 2010, 02:41

Doesn't sound over 3000 rpm to me. It certainly isn't 5600!

Glaerox · 05 May 2010, 06:49

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

Glaerox · 09 May 2010, 13:22

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.

Poly · 09 May 2010, 13:53

Quote:

Originally Posted by Glaerox

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.

martini · 09 May 2010, 13:56

DF15 = 6 pole setting

searover · 30 May 2010, 19:59

Hi im no expert but my rib doesnt, weigh as much as that boat and ive got a 115 on it that looks to me like it needs a bigger motor weather its running full revs or not maybe a 60 70. anyway hope u enjoy the boat.

Glaerox · 31 May 2010, 10:40

I tested the motor in a bun, and was able to het about 5600rpm now. But could only use the warmup lever on the control box. (otherwise the bun would blown away). So it looks like 6P setting did the job!

The boat could handle a max 40HP engine. But my car towing rate does not allow me to make the boat more heavy as it is now(about 300KG). But with the small 15HP engine it perform good.