5 hp briggs 2 cycle?

Geo-TH,In

Well-known Member
My son was given a toro snow blower with a 5 hp briggs 2 cycle engine. I thought he was kidding until I googled it. Briggs did make a special 2 cycle engine for toro. The person who gave it to him says it runs but won't develope power when it gets into snow, it dies. He had a place go over the carb but the problem remains.

I haven't seen it. Just thinking that the muffler could be choked, carboned up. Does anyone have any tips to look for?

Also is it possible to replace engine with a honda clone from harbor freight or is the shaft on briggs a special design?

Thanks
George
 
Those have a air vane governor - at least mine did. It ran at one speed with no throttle lever of any kind on the handle bar. Might check to make sure it (the governor) is in working order. Mine had good power and would slip the belt if the idler was not tight.
 
Run a compression check, I would suspect it is a little low. Low compression will effect 2 cycle more the 4 cycle.
 
Good idea, thanks. I think I read the engine runs around 3600-4000 RPM's. Wish I had a spark plug tach. Had one but the battery went dead. It was soldered and clued in. I tried to remove it and broke the LCD.

Boy lives in Plainfield and complained it takes him 4 hours to shovel drive. I told him I can clean 12 drives in under an hour with my Jubilee and a 7 ft blade. Dad has to rub it in when he can. Boy lives in a sub-division and can't have my toys there. I told him he needs to find a place in country with a pole barn, someday he will need a place for all my toys.
 
My son says the engine starts and runs just fine. But when put under load, it dies. He want to know how would he load test without snow?

I haven't seen it yet. I was wondering if it would be possible to remove belt guard and wedge a 2x4 between pulley and frame to act as a wooden brake.

You said that the belt would slip when under stress, so I figure the board would be a good way to load the engine.

Anyone have a better idea to load test?
 
(quoted from post at 02:19:53 10/09/14) What would be a good compression for a 2 cycle?

I am sure the number could be found through manufacturer.
Some two stroke motorcycle and chainsaw engines have near or over 200#.
This is in high performance engines so I am sure this type engine would be considerably less.
I would GUESS??? it should be at least 90# and up to 150#
Best to get numbers first.
Another consideration would be "engine running lean". That would cause a severe loss of power under load.
To further complicate diagnosis, I am sure you are aware that two strokes have crankcase pressure, or impulse pressure and that should also be checked.
 
I too thought of the 3 things your mentioned,
carbon, lean and is run with out 2 cycle oil low
compression due to scratches on cylinder wills. Not
so sure it doesn't have epa fixed jets like my 10
year old ch20 kohler. One can only hope there are
adjustable jets.
thanks.
 
As stated earlier, problem could be with governor. You might be able to bypass governor by improvising a string or cable to manually open throttle when it is under load by using a board as a friction brake. Whether this can be done depends on how linkage is setup.
Check and see if throttle can be moved at carb butterfly connection plate before setting up brake.
 
As for a load test perhaps you could use a garden hose and run water on the paddles.

To check for governor action remove a cover as required to be allow observation of the throttle shaft at the carburetor. With the engine running, shut off the engine and observe the throttle shaft, as the engine slows the governor should open the throttle.

Two strokes typically (some can be higher) have compression ratios of 6 to 7 to 1 after the exhaust port closes so expect a pressure reading of 100 +/-.

Leaking crankcase seals generally cause hard starting, if the engine exhibits hard starting I would check the seals.

As for exhaust port being clogged I have never cleaned my Toro and I have been running it since they first came out. I bought mine new. The newer two - stroke oils do not produce the carbon as in the past.

Now as for lean mixture - I believe mine has an adjustable main jet. I have never adjusted mine so I just don't remember. If you don't have a set of jet drills - you may want to make the investment. Remember when increasing the jet size flow goes as the cross sectional area not the diameter.

BTW - I may have one of those engines, can't say it is a B&S though.

Good Luck
 
I am curious, what model Toro is it? Some of the later Toro used an R-Tek engine that Briggs is selling parts for
 
Not sure of model #. Briggs made engine for 11 years or so. New carbs are available for about $100, ouch. So are mufflers,$30.
 

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