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Carburetors, Mixers, Fuel Pumps and fuel delivery Discussion about misc. carbs, mixers, fuel pumps, injectors.

Carburetors, Mixers, Fuel Pumps and fuel delivery

B&s WI motor


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  #1  
Old 10-12-2015, 05:11:02 PM
Geochurchi Geochurchi is offline
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Default B&s WI motor

Hi All,can't get this motor to start,there is a decent spark,fresh gas,carb is clean and adjusted to the spec,needle valve out 1 turn,I can see gas in the throat of the carb so gas is being picked up from the tank.
Any thoughts?
Geo
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  #2  
Old 10-12-2015, 05:13:29 PM
Bolens 1000 Bolens 1000 is offline
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Default Re: B&s wi motor

To rule out the carb as an issue will it fire and run a few seconds if you pour some gas down the plug hole ?
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Old 10-12-2015, 08:37:53 PM
Geochurchi Geochurchi is offline
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Default Re: B&s wi motor

No,but I wasn't sure how much gas to pour in there, I tried some starting fluid but that didn't do the trick either,I do have a spark when I lay the plug on the head.
Geo
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Old 10-12-2015, 09:36:46 PM
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Default Re: B&s wi motor

Just because you see spark out of the cylinder does not mean its strong enough to produce a spark while under compression, do you have an inline spark tester so you can see if your getting a strong enough spark to fire?

The engine should start right up with a little squirt of gas or a shot of carb cleaner down the plug hole.
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Old 10-13-2015, 07:35:18 AM
Geochurchi Geochurchi is offline
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Default Re: B&s wi motor

I'll get one, I wasn't thinking about the spark under compression ,what is the correct way to test the compression?this is my first time trying to restore a motor this old so we will see what happens.
Geo
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Old 10-13-2015, 08:03:04 AM
Mason R Mason R is offline
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Default Re: B&s WI motor

You might also have a bad Sparkplug
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Old 10-13-2015, 09:13:20 AM
I like oldstuff I like oldstuff is offline
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Default Re: B&s WI motor

Just an idea, perhaps it's weak magnets that won't produce spark under compression. For a test try closing the points gap down to about .008 to give it more dwell time.
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Old 10-13-2015, 08:33:43 PM
Geochurchi Geochurchi is offline
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Default Re: B&s wi motor

Have not seen the motor run,picked it up an an engine show for something to try and restore,it does have compression and a new J8 plug, I have ordered an inline spark plug tester to see if I can tell what's going on.
Going to be awhile before I get to that.

Geo
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Old 10-13-2015, 10:14:50 PM
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Default Re: B&s wi motor

Ditto on what Akuna said. Find the top of the compression stroke. Mark the top of the flywheel with piston at top of compression stroke. turn it over fast enough to see spark at the plug. If the timing is close you may be able to see the mark you made at about the time the plug sparks. If not then timing is wayyyy off. This is just a diagnostic test not to be used to time exactly.
Even a partially sheared flywheel key can move timing enough to prevent starting.
Good luck.
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Old 10-14-2015, 08:43:06 AM
Geochurchi Geochurchi is offline
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Default Re: B&s wi motor

Wouldn't it be better to check the marks on the gears to see if it is set right? I did at one point after pouring gas in the cylinder get a few puffs of white smoke,key seems to be tight in the flywheel,no muffler installed but I doubt that should affect anything.
Who ever had this before did drain the gas as the tank and carb are clean although the throttle shaft has a little play.
Geo
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Old 10-14-2015, 02:07:02 PM
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Default Re: B&s wi motor

Yes, it would be better but I was assuming you wanted to test as much as possible before opening it up. Good luck
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Old 10-15-2015, 04:37:48 PM
Geochurchi Geochurchi is offline
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Default Re: B&s wi motor

But now that I think about it that is valve timing,I believe.
Geo
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