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 engine cranks for a long time before starting 
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Joined: Thu Mar 13, 2008 8:21 am
Posts: 57
Location: oklahoma
Post engine cranks for a long time before starting
The carbs have been rebuilt and sync'd, a new gear reduction starter placed and solid state ignition, but she takes a while to start.....could it be the sending unit or fuel pump.


Tue Oct 10, 2017 10:48 am
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Joined: Sun Dec 10, 2006 7:38 pm
Posts: 1259
Location: Southwest Wisconsin
Post Re: engine cranks for a long time before starting
Could be the fuel pump, clogged fuel filter, partially collapsed fuel lines or air leak into the fuel lines among other things.
I'd check the fuel filter first and then the fuel lines. If the incorrect fuel lines (SAE instead of metric) are used then it's possible to have air suction leaks at the connections to the carbs and fuel pump. Also the fuel lines do have a tendency to dry out and crack over time.
The sending unit should have no effect on starting.

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Paul C.
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Tue Oct 10, 2017 12:15 pm
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Joined: Sun Dec 10, 2006 7:38 pm
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Location: Southwest Wisconsin
Post Re: engine cranks for a long time before starting
Forgot to ask - by solid state ignition did you mean Pertronix or PinzSSI? If Pertronix, double check the clearance between the sensor and the magnetic collar. Too large a gap will affect starting.

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Paul C.
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'72 Swiss 710M
'89 Puch 230GE


Tue Oct 10, 2017 12:17 pm
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Joined: Wed Apr 14, 2004 9:58 pm
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Location: Idyllwild, CA
Post Re: engine cranks for a long time before starting
Quote:
but she takes a while to start.....
How long between starts does this happen? If you only attempt to start it every week or two then I would suggest that the carb bowls have dried up and are not getting refilled in a timely manner (priming issues due to air leaks, or a pump issue). If this happens within minutes of shutdown, then it is not likely to be fuel related - the carb bowls should still be full.

Put a carb level gauge on the front carb, and see what the fuel level is before, during, and after starting. This is a quick and easy test, and will decide what the next step should be.

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Jim M.
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Tue Oct 10, 2017 12:34 pm
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Joined: Sun Dec 21, 2008 10:50 am
Posts: 96
Location: Atlanta
Post Re: engine cranks for a long time before starting
This problem is on a cold start or a hot start? If hot, I would suspect flooding. This means too much gas went in, confirm by pressing the pedal all the way, wait 20 seconds or so, then crank. If time is reduced, too much gas was introduced, float level is apparently the first thing to check.
Both cold and hot starts are greatly affected by timing.

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Jerome
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Fri Nov 03, 2017 8:39 am
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Joined: Thu Mar 13, 2008 8:21 am
Posts: 57
Location: oklahoma
Post Re: engine cranks for a long time before starting
Thank you,,,,will be checking floats and fuel pump


Fri Nov 03, 2017 10:16 am
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Joined: Tue Jul 05, 2011 6:35 pm
Posts: 247
Location: Paraguay
Post Re: engine cranks for a long time before starting
it happens to me kinda like that..... in hot starts right up, but when sits for more than an hour, takes more cranking..

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Fri Nov 10, 2017 9:50 am
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