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Old 07-25-2009, 05:57 AM   #1
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spring start help

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I have a zenoha g38 that has the magneto. I have tried a new plug. I have done the "get the carb as wet as possible first" thing. I just have not been able to get the engine fired up. I'm wondering what i am missing. There is no choke on this engine so that is out of the question.

Any insight on this is greatly appreciated as i would like to get this engine going.
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Old 07-25-2009, 08:32 AM   #2
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Re: spring start help

When all else fails, read and follow the instructions. Sometines there are helpful clues there.

When you do read them, you will see that the factory is quite explicit about prop mounting location in relationship to the magnets in the flywheel. It is pointed out that unless this positioning is correct, there is not way that the engine will ever fire.

The reason is quite simple. You must get the spark at the correct time. Otherwise, no go. It makes no difference if you are using a spring starter or hand flipping.

It's also important to realize that the prop must be flipped at sufficient speed to result in the magneto generating an adequate output for an acceptable spark. I have read and heard that a rotation speed equivalent to some 600 rpm is required.

My G62 fires up consistently and reliably with the prop positioned as instructed.

If you do not have the engine manual, why not download it from the Horizon Hobby web site?
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Old 08-06-2009, 08:11 AM   #3
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Re: spring start help

I had the same problem with my spring started G62 but it wasn't a starting position issue. It was something far more simple.

I had tons of fuel but found intermittant spark. The ignition system is as simple as you can get, so I started working backwards.

My servo activated kill switch was working fine, but the manual kill switch (a parallel circuit) was beginning to weld itself together and grounding the coil intermittently. The previous time out, it was fine.

Actually DO335, I know the manual's comment on initial starting position and it continues to confuse me as to why. Since the ignition system fires near TDC on every upstroke of the piston (2 stroke engine), and the engine always rotates the same way, and the magnets/pickup have a fixed position, what difference could it possibly make? If your starting position was 10 degrees after the initial starting position, wouldn't it be reasonable to assume that it would catch the next TDC/firing event, 350 degrees later?

Maybe the comment is meant more for the handstarted engines where it's difficult to get 360 degrees by flipping the prop.

If you know, I'd sure appreciate it if you would fill me in.

BTW, sorry for the highjack....

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Last edited by wymbly1971; 08-06-2009 at 08:27 AM.
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Old 08-13-2009, 04:00 PM   #4
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Re: spring start help

Mine start 1 flip after getting wet
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Old 08-13-2009, 10:46 PM   #5
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Re: spring start help

If you take the plug out and put an electric starter on the engine and turn it over, do you get a spark? I find that is an easy way to verify that the ignition system is working ok. If it is, then you can eliminate the ignition.
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Old 08-22-2009, 10:34 PM   #6
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Re: spring start help

I back that up!
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