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Old 04-13-2003, 04:18 PM   #1
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How do I change the rotational direction

of the starter wheel in my Ofna box? Been a long day with this box, first I burned up the wires now, I can't even remember how to change the direction...do I reverse the hookup on the motors?

Thanks.
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Old 04-13-2003, 04:42 PM   #2
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change the polarity in which you connected the motor
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Old 04-13-2003, 04:45 PM   #3
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I think I did something wrong right before I asked that question. I bump started the flywheel without the glowplug in so it would prime the carb. When I did that the flywheel froze. Any ideas? The flywheel should rotate counterclock wise correct?

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Old 04-13-2003, 04:46 PM   #4
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well really the whole tranny is locked, but I'm guessing it's originating at the motor.
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Old 04-13-2003, 06:08 PM   #5
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If its a new engine its probably just stuck in TDC all you have to do is heat it up with a hair dryer and move the pisten to the bottem of the sleave. To switch the rotational direction you just switch the wires on the battery, not the motors, keep in mind that the flywheel moves the opposite direction of the starter wheel.
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Old 04-13-2003, 06:09 PM   #6
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Well actually if the whole trannys locked up theres probably somthing wrong with the tranny or clutch because the tranny should be able to move with a locked up engine as long as the clutch isnt engaged.
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Old 04-13-2003, 06:29 PM   #7
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If I take the engine out and spin the flywheel by hand it won't turn over completely without forcing it.

It seems, after examining the motor with the head off that as the piston rises and reaches it's peak it lifts the sleeve as well. With the head on the sleeve isn't allowed to extend upwards and this is why the engine isn't working right...I think. Can anyone let me know what I need to do?

I've never had a NPS engine so I don't really know what may be wrong or what I should be looking at.

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Old 04-13-2003, 07:21 PM   #8
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u have a very tight pinch at TDC.
as stated before get a hair dryer and heat it up, it will allow it to free up, the i believe u should just start it with the hair dryer keeping it hot.


Some one else please explain about how tp start with a tight pinch.
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Old 04-13-2003, 07:22 PM   #9
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What is a TDC?
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Old 04-13-2003, 07:29 PM   #10
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Top dead centre


its when the piston is at the top of the motor and it cant go any higher because of the Conrod length.
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Old 04-13-2003, 07:31 PM   #11
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Ok, now where should I be heating it up with the hair dryer? On the head or below? Not really sure.
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Old 04-13-2003, 07:33 PM   #12
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the sleeve isnt surposed to move up and down... you just have a tight fit
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Old 04-13-2003, 07:33 PM   #13
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I havent actually ahd to do it b4.
But i believe that u heat around about the level of the glow plug blowing side on, since thats the metal in that area u need to heat up so u can free from some pinch.
So just get your Hairdryer and hold it on High, Hot setting and just do the whole motor till its really warm and u can free the piston.

have it so u r just about to start the engine, so then start it up and let it have a just above idle so its turning over.
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Old 04-13-2003, 07:35 PM   #14
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Saus he has the head off, and as the piston comes up on its rotation, as it reaches pinch, because the sleeve is not being held down, the piston is lifting the sleeve.
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Old 04-13-2003, 07:37 PM   #15
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Ok I have the hair dryer blowing on it now....hehe I don't even have to hold it. I'll try to prime the motor in a minute or so and then try to start it.
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