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Old 22 January 2012, 11:47   #1
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Pull starting a 200 0ptimax

I have Just Serviced my engine so decided to run it up on the muffs, i knew the starting battery was weak (float switch caught me out again!) so decided i would try to jump start it (2003 200hp optimax) with a fully charged battery but couldnt, even with a decent set of leads and a good connection the volt meter still only read 11.3 v??? Donor battery was reading 13v . Anyone know why this would be the case??
(ended up swapping the battery to start)

I then got thinking what the chances would be of being able to pull start it if I rigged a cord up to the fly wheel in an emergency situation?

Anyone ever tried it??

I presume you would require a battery with at least enough juice for ignition and fuel pump for it to work?
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Old 22 January 2012, 12:11   #2
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I somehow doubt you'd manage it. I know my Suzuki is designed to take three full revolutions before firing so that all of its sensors can take a reading before ignition comes on. There's no way I could do that with a cord round the flywheel. I think also that if you're battery is so low that it won't turn over then it's unlikely to have enough juice to keep the pump and ecu running even if you did get it to catch.
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Old 22 January 2012, 12:35   #3
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NO chance with an Opti, you have to get the compessor running around 80psi and that aint gonna happen on a pull start
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Old 22 January 2012, 13:19   #4
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Quote:
Originally Posted by Waterman View Post
I have Just Serviced my engine so decided to run it up on the muffs, i knew the starting battery was weak (float switch caught me out again!) so decided i would try to jump start it (2003 200hp optimax) with a fully charged battery but couldnt, even with a decent set of leads and a good connection the volt meter still only read 11.3 v??? Donor battery was reading 13v . Anyone know why this would be the case??
(ended up swapping the battery to start)

I then got thinking what the chances would be of being able to pull start it if I rigged a cord up to the fly wheel in an emergency situation?

Anyone ever tried it??

I presume you would require a battery with at least enough juice for ignition and fuel pump for it to work?
If there's one thing I've learn't it's that the battery must be tip top to get an opti to start.
I've had mine rigged with all the pressure test guages and watched what needs to happen, Ashby is dead right, no hope of pull start.
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Old 22 January 2012, 15:20   #5
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hmmm, not worrying at all!
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Old 22 January 2012, 16:45   #6
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You wont do it, the ECU needs power first to switch everything on. And as said you need to charge the compressor which you can do with about 3 pulls. But the ECU has to on and without a battery it will not fire.
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Old 22 January 2012, 17:09   #7
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You wont do it, the ECU needs power first to switch everything on. And as said you need to charge the compressor which you can do with about 3 pulls. But the ECU has to on and without a battery it will not fire.
Does that mean that in theory if your starter solenoid goes down(for example), you can start it by hand after a lot of pulls to charge the compressor?
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Old 23 January 2012, 05:08   #8
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Does that mean that in theory if your starter solenoid goes down(for example), you can start it by hand after a lot of pulls to charge the compressor?
Only with a really long pull cord and a big run up!
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Old 23 January 2012, 05:26   #9
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even with a decent set of leads and a good connection the volt meter still only read 11.3 v??? Donor battery was reading 13v . Anyone know why this would be the case??
?
They are as said very voltage sensitive. The usual voltage drop is due to corrision on the master switches and main starting wires , either that or your battery is on its way out ....

I went form 12.5v at the battery to 5v at the engine ......new wire solved all the problems !
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Old 23 January 2012, 08:39   #10
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Quote:
Originally Posted by Turbodiesel
You wont do it, the ECU needs power first to switch everything on. And as said you need to charge the compressor which you can do with about 3 pulls. But the ECU has to on and without a battery it will not fire.
Ok so with no battery connected it would not be possible and would probably damage the alternator/charging circuit, but in theory if you had a run down battery with enough power for ecu, fuel pump but not enough to turn the engine over it could possibly be done??

Wonder what the min voltage the ecu needs?? Could it run on eg. 10v?

There may only be one way to settle this!!!

(Will post pics of my hernia)
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