Engine starts backwards 7 times out of 10

Engine starts backwards 7 times out of 10
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Engine starts backwards 7 times out of 10 - 7/28/2003 11:45:34 PM

Zeetah

Posts: 13
Joined: 7/12/2003
From: Redmond, WA,
Status: offline

The engine runs great, starts easily but seven times out of ten, it will start backwards.

To get it going the right way (counter clockwise), I have to stop it (by grabbing the spinner - there has to be a safer way) and then retry.

The piston and con rod are just a tad loose. Could that be it ?

Do I need to reduce the compression ? I already have two glow head shims.

What else can cause this ?

Thanks.

Engine starts backwards 7 times out of 10 - 7/29/2003 12:09:40 AM

Posts: 2463
Joined: 5/2/2003
From: Concord, NC,
Status: offline

Is this a Cox reed valve engine and are you trying to start it by hand flipping?

Later,
Tim

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engine starting - 7/29/2003 12:28:30 AM

3 Channel Brain

Posts: 94
Joined: 10/14/2002
From: VA
Status: offline

All reed valve & or piston port 2 strokes will run either way.
I have seen people starting up by flipping clockwise. an electric starter will also force it to start up CCW. Norvel sells one especially for small engines. pinching the fuel line or pulling it off
is prolly a safer way to stop bad starts.

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Engine starts backwards 7 times out of 10 - 7/29/2003 1:56:54 AM

Zeetah

Posts: 13
Joined: 7/12/2003
From: Redmond, WA,
Status: offline

This is a Black Widow - reed valve engine.

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Engine starts backwards 7 times out of 10 - 7/29/2003 2:57:13 AM

Posts: 9053
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: online

You can try flipping it backwards. If your odds hold true it'll start the right way 7 out of 10 times. But just as in Vegas there's no such thing as even money....

My suggestion is to get one of the Cox starter springs. These almost guarantee easy starts and ensure the prop is going in the right direction.

And go back to the single head gasket. If the rod socket is loose it's wise to have it reset since it'll only get worse with all the banging around it's doing.

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Engine starts backwards 7 times out of 10 - 7/29/2003 8:28:41 PM

Zeetah

Posts: 13
Joined: 7/12/2003
From: Redmond, WA,
Status: offline

The engine likes to run backwards - when I have flipped it backwards (clockwise), most of the time, it will run backwards (clockwise).

It is pretty annoying...

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pusher prop? - 7/29/2003 9:22:03 PM

Posts: 184
Joined: 6/11/2003
From: SAnta Barbara, CA,
Status: offline

Have you considered mounting a pusher-prop and just letting it run backwards?

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Engine starts backwards 7 times out of 10 - 7/30/2003 12:58:12 PM

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Joined: 11/6/2002
From: Mission, BC, CANADA
Status: offline

I've had the odd COX that can't decide which way to run and it just flips 1/2 a revolution back and forth.

< Message edited by Bipe Flyer -- Jul 30 2003 8:33AM >

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Engine starts backwards 7 times out of 10 - 7/30/2003 6:05:44 PM

Posts: 1288
Joined: 1/6/2002
From: Cordova, TN, USA
Status: offline

Zeetah, I saw some cl Mouse racer pit men use this trick.

They sawed off a 1/4" hardwood dowel to about 5" long. Over the dowel, they slipped some clear 'hard' plastic tubing like you can get at any hardware store. They left a portion of it open over the end of the dowel (about 1/2"

.

They would then use the dowel as a chicken stick in the normal manner to start the engine, and in the event they got a backwards run, they would poke the open tubing end over the spinner. This was just enough friction to stop the engine.

I noticed Lynn S was using a similar 'tool' while starting his starter spring equipped Black Widows. (good idea...)

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Engine starts backwards 7 times out of 10 - 7/30/2003 8:04:13 PM

Posts: 357
Joined: 9/26/2002
From: Santo, TX, USA
Status: offline

I've always kept a cloth rag in my back pocket and whenever an engine starts backwards, I simply toss it into the spinning prop, then, restart. Jim

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Engine starts backwards 7 times out of 10 - 7/31/2003 4:06:31 AM

Posts: 2463
Joined: 5/2/2003
From: Concord, NC,
Status: offline

Zeetah,

Get your hands on a Cox Zero Drag starter spring like the one I have on my engine in the picture. It diengages from the prop and does not use the cam like other Cox springs. Sorry for the bad photo.

Later,
Tim

P.S. Hey Bipe Flyer... your flippy engine is over compressed get another head gasket on it!!!

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You know it's going to be a bad day when you get pissed on by a turtle!

(in reply to Zeetah)

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