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No hot start #4416191
05/28/17 10:26 AM
05/28/17 10:26 AM
Joined: Feb 2008
Posts: 1,060
MA.
Camprunner Offline OP
Camprunner  Offline OP
Joined: Feb 2008
Posts: 1,060
MA.
I have a JD mower with a B&S 6.75 hp OVV motor that does not like to start when hot. If I go in the house for say 10-15 min and then try and start it no luck I have tried no primer and priming. The motor seems to have good compression does not use any oil. The spark plug is about two years old should I replace plug? What you all think?

Re: No hot start [Re: Camprunner] #4416205
05/28/17 10:53 AM
05/28/17 10:53 AM
Joined: Mar 2008
Posts: 5,841
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,841
South Florida
Replace the plug. It COULD be the coil. When they are going out they often dont start when hot. Regap the plug to 0.020 from 0.030 to see if that helps.

If its not the spark, then it could be the carb. They use super lean carbs now thanks to the EPA which can make hot starts a problem.

Also, check the autochoke for proper functioning.


17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30


Re: No hot start [Re: Camprunner] #4416238
05/28/17 11:24 AM
05/28/17 11:24 AM
Joined: May 2017
Posts: 105
Pittsburgh, Pa
Fastcompany Offline
Fastcompany  Offline
Joined: May 2017
Posts: 105
Pittsburgh, Pa
Lean should make it hard to start cold and rich make it hard to start hot. I'm with the auto choke funtion probably being the issue.

Re: No hot start [Re: Camprunner] #4416241
05/28/17 11:25 AM
05/28/17 11:25 AM
Joined: Jun 2003
Posts: 33,111
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,111
ME
My perfectly functioning chondas (plural) need a little choke to start hot. Just the way they're set up.

Re: No hot start [Re: Camprunner] #4416433
05/28/17 03:02 PM
05/28/17 03:02 PM
Joined: Nov 2009
Posts: 4,945
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline
Joined: Nov 2009
Posts: 4,945
Houston, Texas
vapor lock. Undo the gas cap then put it back on.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: No hot start [Re: Camprunner] #4416509
05/28/17 04:34 PM
05/28/17 04:34 PM
Joined: Jun 2012
Posts: 54
southern oklahoma
1989outlaw Offline
1989outlaw  Offline
Joined: Jun 2012
Posts: 54
southern oklahoma
The gas cap is already vented opening it will NOT cure vapor lock

Re: No hot start [Re: Camprunner] #4416861
05/29/17 04:34 AM
05/29/17 04:34 AM
Joined: Jan 2011
Posts: 2,725
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,725
N.Ohio
Check valve clearances.


The "thinking" man's friend.
Re: No hot start [Re: Camprunner] #4417448
05/29/17 05:59 PM
05/29/17 05:59 PM
Joined: Sep 2015
Posts: 5,873
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,873
Kalifornia Kollective
+1

Often they are just a touch tight and will bleed enough back to the intake when hot to mess up the mixture. I run all my air cooled 4-stroke valves on the loose side of spec and they all run fine smile

It may also be the ignition as stated. Do you have a ignition tester? This one will do and tell you a lot: http://www.ebay.com/itm/Adjustable-High-Energy-Ignition-Spark-Plug-Tester-Wire-Coil-Circuit-Diagnostic-/142196993245?hash=item211b99ecdd:g:NPwAAOSwA3dYhwt1 smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: No hot start [Re: Camprunner] #4417774
05/30/17 04:19 AM
05/30/17 04:19 AM
Joined: Feb 2015
Posts: 2,203
Slovenia EU
Kamele0N Offline
Kamele0N  Offline
Joined: Feb 2015
Posts: 2,203
Slovenia EU
CDI unit!


2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10w40
Re: No hot start [Re: Camprunner] #4417783
05/30/17 05:28 AM
05/30/17 05:28 AM
Joined: Jan 2011
Posts: 2,725
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,725
N.Ohio
No CDI, uses a magneto.


The "thinking" man's friend.
Re: No hot start [Re: Camprunner] #4431034
06/14/17 09:14 AM
06/14/17 09:14 AM
Joined: Mar 2005
Posts: 885
LI, NY
97 GTP Offline
97 GTP  Offline
Joined: Mar 2005
Posts: 885
LI, NY
I had an issue with a 2 stroke snow thrower that would do the same thing....after much trouble shooting I discovered that the needle seat in the carb leaked when hot. To test if it's leaking fuel, shut it off and immediately try and restart it. In my case if I waited more than 2 minutes it won't start unless I waited 20 minutes or so.

Re: No hot start [Re: 1989outlaw] #4451901
07/06/17 11:30 PM
07/06/17 11:30 PM
Joined: Feb 2013
Posts: 12
Ohio
SuperChevy Offline
SuperChevy  Offline
Joined: Feb 2013
Posts: 12
Ohio
Originally Posted By: 1989outlaw
The gas cap is already vented opening it will NOT cure vapor lock


Could still be vapor lock... just worked on a john deere about 2 months ago with a no hot start and hot stall complaint... found that the vent (a small hole in the center of the fuel cap) was plugged with what appeared to be mud of all things. Cleared the vent hole and the no hot start hot stall issues were gone. Owner very happy! So, If the OP is noticing that the engine seems to loose power and/or stalls after running for some period of time (happens quicker with a full tank vs a near empty tank) check your fuel cap!

Re: No hot start [Re: Camprunner] #4451910
07/06/17 11:47 PM
07/06/17 11:47 PM
Joined: Feb 2016
Posts: 514
USA
DrRoughneck Offline
DrRoughneck  Offline
Joined: Feb 2016
Posts: 514
USA
Been over a month, any update OP?


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