[Shop-talk] mower engine issue
scott.hall at comcast.net
scott.hall at comcast.net
Tue Aug 25 07:00:47 MDT 2009
right, so I'm a genius. it's THIS engine. I mean, the only thing missing are the honda identifying stickers. those chinese are getting really, really good at copying stuff.
http://www2.northerntool.com/engines/honda-horizontal/item-6059.htm
actually, honda seems to have several different models in that line, but the one on the cart at least *looks* just like that one.
anyhow, it'll idle, or almost, anyway. I got it to idle last night, it's just that the low part of the period sometimes coincided with 'engine off'. and if it does have an idle circuit, where might it be? I cleaned every hole I saw in that carb, but maybe I missed one. I assume it's either to do with the spring not being hooked up or the governor itself is messed up, because it does it at all rpm ranges. at wot it just goes from wot to slightly lower and back, etc.
if it's used to maintain a fairly constant engine speed, well...like randall said, why do I want that? I can just scrap the whole assembly and hook the throttle cable from the pedal to the carb plate? or does it actually run better (or only) with that thing on there? now that you guys mention it, the cable isn't hooked up to the throttle plate at all. like you said, it seems to be 'suggesting' a speed. well, that's no fun in a cart.
I also love the yamaha stuff. I've brought back two rds from the dead with that stuff.
thanks guys.
----- Original Message -----
From: "Jim Franklin" <jamesf at groupwbench.org>
To: "Shop Talk" <shop-talk at Autox.Team.Net>
Sent: Tuesday, August 25, 2009 8:29:41 AM GMT -05:00 US/Canada Eastern
Subject: Re: [Shop-talk] mower engine issue
On Aug 25, 2009, at 7:50 AM, scott.hall at comcast.net wrote:
That's the governor. It takes engine speed (usually from the air
coming off the cooling fins on the flywheel acting on a vane, or by a
connection into the crankcase) and limits it by being directly
connected to the throttle. The spring is the connection between the
gas pedal, turtle/rabbit handle, etc and the carburetor. It takes the
operator's requested speed and suggests it to the carburetor. When the
engine speeds up the governor acts against the spring to throttle back
to a pre-set maximum (either for lawnmower blade speed federal
maximums, or connecting rod integrity). Do not mess with this if you
do not understand it, and certainly, once you understand it, do not
adjust/defeat the governor to allow a higher speed than they set it up
for ;-)
What I believe is happening is your idle circuit isn't working, still
plugged up. When the engine starts to stall, the governor has less
wind acting on it so the throttle starts to open, activating the main
circuit which runs just fine. Engine speeds up, throttle closes, no
more gas, engine slows down, throttle opens, repeat. You need to clean
out the idle circuit. It's too small to get in there with mechanical
means without scoring it, so you'll need to use chemical means,
soaking the carb for a day or two. A gallon of Berryman's is $30 or
so, but my favorite is Yamaha carb cleaner in the black one liter
bottle if you have a dealer nearby. Follow the directions on the
Yamaha stuff, though I have also used it in teh gas tank and let it
burn through with no ill effects.
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