[AT] Need some help, hard starting CR950 Briggs
Cecil Bearden
crbearden at copper.net
Tue Feb 15 08:14:31 PST 2022
There are 2 types of ether starting fluid. 20% and 50%
Cecil
On 2/15/2022 8:19 AM, Indiana Robinson wrote:
> 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
> <mailto: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
>>
>>
>>
>>
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>>
>>
>>
>> On Sun, Feb 13, 2022 at 8:15 AM Moe Fretz <tubetester at gmail.com
>> <mailto: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
>> <mailto: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
>>> <mailto: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 <mailto: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 <mailto:robinson46176 at gmail.com>
>
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