[AT] Need some help, hard starting CR950 Briggs

Tue Feb 15 06:19:27 PST 2022

Thanks guys...I need to use it this week and maybe next week. I'll be
trying some things, especially Steve's LP trick. I wonder where I put those
torches. :-)
One thing on my side now is that it will be 50 degrees today and 60
tomorrow. I may not need anything extra. I do know that one problem is the
thick oil in the tank and it not having a way to clutch out the pump for
starting.
I'll try to keep you posted.

On Mon, Feb 14, 2022 at 9:59 AM Stuart Harner <stuart at harnerfarm.net> wrote:

> Remember the old fire triangle? Fuel-Air-Heat.
>
> With the ever more restrictive regulations filtering down to the smaller
> engines the manufacturers have had to lean out the mix as far as possible.
> If you were to put a pyrometer on one my guess is that at operating
> temperature they are running on the lean side of peak.
>
> As air temp drops it gets more dense but without a choke to compensate the
> mix is just too lean to light off. To make things worse they have taken all
> of the adjustments away from the end user to prevent us from becoming
> criminals against the regulations. I suspect it also makes the carbs easier
> and cheaper to manufacture. If a bad one slips through, just replace it or
> the engine because it is cheaper than figuring out the problem. We see this
> in a lot more then carburetors.
>
> Changing to a lighter hydraulic fluid will help make it easier to spin the
> engine faster when pulling the starter. I am not sure if that will help
> make a hotter spark or not considering it probably has electronic ignition
> anyway. Faster starting RPM could help with sucking in more fuel each
> stroke but then that means more air to, so back to lean.
>
> I suspect that Farmer's engine sputters once in a while is that the raw
> fuel builds up enough in the cylinder to cause a rich enough mixture to
> fire once or twice. Once that is burned off, back to square one.
>
> I am not sure that adjusting the valves would help any unless there is a
> way to lengthen the duration. Taking out all the backlash might cause the
> valve to open a fraction sooner, but once everything is warm and expanded
> there is a risk of it not closing fully and burning the valve or seat.
>
> To get a more rich mixture for starting you could try to restrict air
> (like the old choke plates did) or add fuel like a primer does.
>
> I have a Knipco stye heater that will not light off at any air temp unless
> I use both hands and cover as much of the air intake as possible. It lights
> in less than a second and then runs fine. I have tried different nozzles
> and moving the igniter around, but it still needs less air to get going.
>
> On the 1978 motorcycle I once had it was a victim of early tampering with
> emissions on motorcycles. When new it would not start on a cool day and it
> had a manual choke. I rigged up a way to inject a little ether into the
> airbox that was buried under the seat. Had to put 10,000 miles on that bike
> before it got over that problem.
>
> The idea of using an unlit torch to add a little fuel sounds like a good
> one. Red Green would just slap a little piece of duct tape on the air
> intake until it warms up.
>
> Best of luck to Farmer getting this working.
>
> Stuart
>
>
> On 2/14/22 01:34, Greg Hass wrote:
>
> I have a JD Zero Turn with 27 hp. Briggs engine and electric start.
> Anything around 45 to 50 degrees and it just wouldn't start. It does not
> idle good either, but the book says that is because of emissions control.
> My brother has a Simplicity zero turn 3 years old and several times has
> tried to start it in 40 degree and it just won't fire so it is not just my
> mower. Both engines have fixed jets so no adjustment is possible. It is
> possible other things could be wrong, but my only other idea is to make
> sure it has fresh WINTER blend gas.
>        Greg Hass
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Sun, Feb 13, 2022 at 8:15 AM Moe Fretz <tubetester at gmail.com> wrote:
>
>> Try this site, they should be able to help  you.
>>
>> http://ppeten.com/forums/search.php?search_id=newposts
>>
>>
>> On Sat, Feb 12, 2022 at 18:51 Mike M <meulenms at gmx.com> wrote:
>>
>>> Hi Farmer,
>>>  Just a thought, my log splitter was hard to start in cold weather,
>>> until I changed the hydraulic fluid from the OEM  fluid to transmission
>>> fluid,a whole world of difference.
>>>
>>> Mike M
>>>
>>>
>>>
>>>
>>> On 2/12/2022 9:24 PM, Stephen Offiler wrote:
>>>
>>> Hi farmer:  I'd have to think you've already been down this road, but,
>>> I'll say for the record that I've had pretty decent luck downloading
>>> manuals from the Briggs site.  But I haven't done it lately, and it's
>>> always 20-year old stuff when I do.   The other thing I'll mention is the
>>> good old unlit propane torch in the intake trick.  That's my go-to when
>>> they're almost trying to start.  There's spark and fuel but the modern
>>> carburetors are set lean for emissions and it just seems that the choke
>>> doesn't quite get the mixture rich enough.
>>>
>>> Good luck,
>>> Steve O.
>>>
>>> On Sat, Feb 12, 2022 at 7:43 PM Indiana Robinson <
>>> robinson46176 at gmail.com> wrote:
>>>
>>>> We have a log splitter a couple of years old that has a OHV CR950
>>>> Briggs. It only has a few hours on it but has become quite hard to start
>>>> (recoil start). It is way too recent for my knowledge base... It seems that
>>>> most things are these days. Apparently the OHV Brigg's have a cam bump
>>>> "compression relief" I also understand that there is an important valve
>>>> adjustment procedure that can normally improve starting problems. We can't
>>>> find a site that gives a clear and understandable explanation of the
>>>> procedure.
>>>> Does anyone know of a site with a clear description of how to do it? It
>>>> will usually start if it is sitting in the sun and the temp is at least
>>>> 50... Yesterday at 45 degrees it "ALMOST" started 837 times... It keeps
>>>> firing enough to keep you trying and trying...
>>>> Thanks
>>>>
>>>> --
>>>> --
>>>>
>>>> Francis Robinson
>>>> aka "farmer"
>>>> Central Indiana USA
>>>> robinson46176 at gmail.com
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>> --
>> Moe Fretz
>>
>> L’Orignal ON,
>> Canada
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-- 
-- 

Francis Robinson
aka "farmer"
Central Indiana USA
robinson46176 at gmail.com
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