starting problem 70 hp build 1994

[peterdepaauw]

Goodmorning here a problem from Holland
Ik bought a force 70hp and run it for a half hour and the motor stops running.
Itook the boat on the trailer an make a few checks
I have sparks on the 3 cilinders
I have fuel in the carburator is diffecult to see but when i used the shoke i can see it insight.
I started the engine and only heard after a few seconds starting a puff outside the prop and smell the feul
I have on the 3 cilinders 9 bar pressure
Can somebody help me because in holland the said its maybe the stator or the switch box.
Is that possible because a have a nice spark???
Greetings from holland

 

[john from md]

Re: starting problem 70 hp build 1994

If you have a nice spark on all three cylinders, then your stator, trigger, CDI modules and coils are fine.

Do you pump the fuel bulb until it is hard prior to starting?

Are you placing the throttle lever in the high rpm position prior to start?

Are you holding the key in long enough to give the engine a good choke when starting? Force engines are extremely cold blooded and need to be choked alot when cold.

Have you checked the fuel strainer to insure it is not clogged?

Let us know,

John

 

[peterdepaauw]

Re: starting problem 70 hp build 1994

Hallo John
Yes i will pump up the bulb 4 times and het is very hard
I give max throttle in the free gear and start with the choke open
When i used the choke i can see fuel in the chamber of the carb
and the fuel came out of the proppeller exhaust
I have checked the fuel lines from tank to feulpump its ok
I checked it from fuelpomp to filter and filter i have changed yesterday
then i have fuel in the carb.bottle and is also clean
When i give full throttle a cant see fuel coming in the carb?
Is that normal?
Only when i used the choke.
But the engine wont start even not a small kick trying to start.
peter

 

[john from md]

Re: starting problem 70 hp build 1994

Peter,

You say you are getting three good sparks but the engine does not even fire a little? That is extemely strange.

It is not unusual to get fuel coming from the carbs when you choke. It is just the design of the carbs that causes that. During starting, you will not see fuel at full throttle as there is not enough vacuum to suck it through the main jet unless the choke is closed.

How many psi is 9 Bar? Your compression should be around 150 psi. It will run even if it is at 120 psi as long as all three cylinders are even.

When you pull your spark plugs are they wet? Maybe you have the engine flooded and need to clear it out.

Try pulling the plugs, motor the engine with the trottle in idle and no choke. Next, put the plugs back in and try starting in normal idle with no choke. The idea here is to see if it will fire at all. If it does, then it confirms that it was flooded. If not, we will have to go back to the drawing board.

Make sure you keep your battery charged as troubleshooting draws alot of charge from the battery.

John

 

[peterdepaauw]

Re: starting problem 70 hp build 1994

Goodmorning John
I will collect mij boat this week and try all this things your are saying
I have checked the compression on the chart and
Cilinder 1 almst 10 bar =145 psi
Cilinder 2 almost 9 bar =133 psi
Cilinder 3almost 10 bar-145 psi

I went to a shop here in holland and the say
You stator or cdi unit is defect
but i have a very good spark????

I will first try to do the things you said
Greetings from Holland Peter

 

[roscoe]

Re: starting problem 70 hp build 1994

Hello Peter.
Your stator and cdi are fine.

I would check the timing indicator when you are cranking it.

Final timing adjustment needs to be set when running at full throttle, at 30* BTDC.

 

[peterdepaauw]

Re: starting problem 70 hp build 1994

Hallo roscoe
Ok its 100 % sure its not the stator or cdi
What doe you mean with the timing indicator is that the TRIGGER?
The trigger give the correct times for the cilinder at the right time?

I have another question about the carb.
When i only used the choke and the carb is blogged is it possible to start the engine?
I ask for this question because i read this forum and find also the same problem with this engine.
The problem after al was a blocked carb inside with dirt
Can i make good a check that i get enough fuel in de carb.?
Greetings Peter

 

[peterdepaauw]

Re: starting problem 70 hp build 1994

Goodmorning
Thanks for al the info the engine is running.......
The problem was the flywheel there was a bad key insight
The timing was wrong
Change everything an locked it tight
I went on the water and runs great
Thanks everybody
Peter de Paauw

 

[john from md]

Re: starting problem 70 hp build 1994

Good luck and happy boating Peter.

John

 

[roscoe]

Re: starting problem 70 hp build 1994

congratulations