won't allways start in forward

1989Marathon · 01-07-2014, 01:37 PM

Does it turn over but just not start? Or does it not turn over either?
If it does turn over, check the compression when this happens. Check it in forward, then reverse.

panamaguy · 01-07-2014, 02:54 PM

It turns over and starts sometimes in forward,I will do a comp. test both directions and let you all know.With the new top end and crank seals I'm hoping for 125psi.Yes??

1989Marathon · 01-07-2014, 03:01 PM

You'll likely see 110 and up if it is good.

panamaguy · 01-08-2014, 01:00 PM

Did the compression test looks like 118 psi. turns over in forward but won't run,what should I check next?

1989Marathon · 01-08-2014, 06:53 PM

When you put the new crank seals in, did you lube up the rubber lip?

panamaguy · 01-08-2014, 07:12 PM

Yes,I used a little 90# gear-oil,if I have good comp.which I do,fuel and spark and it starts and runs in reverse what would keep it from starting and running in forward?I'm stumped!

1989Marathon · 01-08-2014, 07:13 PM

Is the plug wet when it doesn't start in forward?
Also, does it have good power in reverse?

panamaguy · 01-09-2014, 02:27 PM

OK,just checked it out.The plug is not really wet when it doesn't start in forward.ait doe's have full power in reverse.The fuel pump is working in both directionsI have the same spark forward and reverse,cleaned the f/r switch and connections.The crank seals are not leaking,so now what do I check?

1989Marathon · 01-09-2014, 05:30 PM

I guess I would check the timing next. I would also check the reeds to make sure they are closing correctly. Has it ever NOT started in reverse? Is the wiring all stock, or has it been messed with?

redcloud · 01-09-2014, 09:46 PM

I think I would now do a complete and very good wiring check for proper routing. Also do a continuity check on all wires as you may have a bad wire that looses continuity. Do very good check of all connections to everything.
How full is the gas tank? Have you loosened the cap to see if your not vacum locking the fuel flow? Check the fuel pickup tube and top of tank connection to make sure you are not loosing suction of fuel. This could be intermiten so could show good fuel flow when checking pump but when all hooked up may be diff. Just a thought.

01-07-2014, 01:37 PM	#11
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: won't allways start in forward Does it turn over but just not start? Or does it not turn over either? If it does turn over, check the compression when this happens. Check it in forward, then reverse.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

01-07-2014, 02:54 PM	#12
panamaguy Not Yet Wild Join Date: Apr 2013 Posts: 64	Re: won't allways start in forward It turns over and starts sometimes in forward,I will do a comp. test both directions and let you all know.With the new top end and crank seals I'm hoping for 125psi.Yes??
panamaguy Not Yet Wild Join Date: Apr 2013 Posts: 64

01-07-2014, 03:01 PM	#13
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: won't allways start in forward You'll likely see 110 and up if it is good.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

01-08-2014, 01:00 PM	#14
panamaguy Not Yet Wild Join Date: Apr 2013 Posts: 64	Re: won't allways start in forward Did the compression test looks like 118 psi. turns over in forward but won't run,what should I check next?
panamaguy Not Yet Wild Join Date: Apr 2013 Posts: 64

01-08-2014, 06:53 PM	#15
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: won't allways start in forward When you put the new crank seals in, did you lube up the rubber lip?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

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01-08-2014, 07:12 PM	#16
panamaguy Not Yet Wild Join Date: Apr 2013 Posts: 64	Re: won't allways start in forward Yes,I used a little 90# gear-oil,if I have good comp.which I do,fuel and spark and it starts and runs in reverse what would keep it from starting and running in forward?I'm stumped!
panamaguy Not Yet Wild Join Date: Apr 2013 Posts: 64

01-08-2014, 07:13 PM	#17
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: won't allways start in forward Is the plug wet when it doesn't start in forward? Also, does it have good power in reverse?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

01-09-2014, 02:27 PM	#18
panamaguy Not Yet Wild Join Date: Apr 2013 Posts: 64	Re: won't allways start in forward OK,just checked it out.The plug is not really wet when it doesn't start in forward.ait doe's have full power in reverse.The fuel pump is working in both directionsI have the same spark forward and reverse,cleaned the f/r switch and connections.The crank seals are not leaking,so now what do I check?
panamaguy Not Yet Wild Join Date: Apr 2013 Posts: 64

01-09-2014, 05:30 PM	#19
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: won't allways start in forward I guess I would check the timing next. I would also check the reeds to make sure they are closing correctly. Has it ever NOT started in reverse? Is the wiring all stock, or has it been messed with?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

01-09-2014, 09:46 PM	#20
redcloud Gone Wild Join Date: May 2013 Posts: 320	Re: won't allways start in forward I think I would now do a complete and very good wiring check for proper routing. Also do a continuity check on all wires as you may have a bad wire that looses continuity. Do very good check of all connections to everything. How full is the gas tank? Have you loosened the cap to see if your not vacum locking the fuel flow? Check the fuel pickup tube and top of tank connection to make sure you are not loosing suction of fuel. This could be intermiten so could show good fuel flow when checking pump but when all hooked up may be diff. Just a thought.
redcloud Gone Wild Join Date: May 2013 Posts: 320

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