20 Most Recent Craftsman 25cc 2-Cycle Gas Blower/Vac - Page 7 Questions & Answers

My first thought is fuel delivery but could be other.

To determine if its fuel or spark, run it until it fails. Then try starter fluid directly into the carburetor. If it fires and runs for a few seconds then it's a no fuel issue. If it cranks but does not fire, then more likely a no spark issue.

To successfully use starter fluid you need to remove the air filter assembly and spray a one second burst of fluid directly into the exposed carburetor throat and then promptly attempt to start.

Comment for further assistance.

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Check the shear bolts .

remove rear cover and check linkage /lever on trans axle

for some reason your model number is not recognised. There are the places for spares.

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Yes I see this is old stuff but just let me help out in case someone today is searching, Anyway if this is a rear engine rider snapper make sure you have your 1 inch play between the idler (small one) and the belt if more it will shake your teeth out haha...Ta da! Look up belt diagram for rear engine rider if needed it will show you the right idler. B.

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Hi Jerry: My Craftsman ride on Mower does not have "gears" as such. There are separate forward and reverse pedals. Can you give us a model number for your machine?

There are Craftman model numbers and there are Briggs and Stratton model numbers. Here are ALL the Briggs and Stratton model numbers. You numbers don't fit, but if you can find it, these repair manuals are free to download. https://www.briggsandstratton.com/content/dam/briggsandstratton/na/en_us/Files/FAQs/model_vs_repair_manual2.pdf This states each engine is different! What is the valve clearance on a 21 HP Briggs and Stratton If it turns out that the engine is a 33M677/0149-B1, the required valve clearances are 0.003-0.005" for both intake and exhaust, but this is different for each different engine size, so let's make sure we are talking about the right engine. Aug. 27, 2014

Briggs & Stratton 21hp - OutdoorKing Repair Forum

https://www.manualslib.com/manual/835377/Vanguard-Ohv-V-Twin.html

Remove both spark plugs and test each cylinder for compression. Just press your thumb over the spark plug hole and crank engine. A good cylinder will forcibly push your thumb away with a pfft sound. Likely you'll find one cylinder has no compression.

If you have a dead cylinder, remove the rocker arm cover and assess the damage. If you're lucky you'll find a push rod out of place with no other damage.

Check operation of the seat switch.

The safety circuitry requires operator in seat while brake OFF or PTO ON, else engine kill.

You did not install the belt correctly, try again!

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so order one -fixya doesnt sell products

sears.com or online search

Wire diagram shows ignition switch in ON position, PTO switch ON, and either control arm not in reverse for PTO clutch energized. PTO clutch uses frame ground for circuit return.

Check switch functions and clutch cable ground.

sears .com or any parts site

You need part 428046 BRACKET, BATTERY which is marked as 20 on pg.6 of the part list on https://www.drmower.ca/a/downloads/-/0948d453b91dbba3/c153128994a88c67/download It's $2.55 at https://www.searspartsdirect.com/product/3wky1bsixd-0071-917/id-428046

Check fuel valve is fully open. Check that fuel flows freely from to the carburetor input fitting... just remove line at carb and it should be a full steady stream of fuel.

Check that the primer bulb functions.

Be sure the O ring between backside of carburetor and engine intake is in good condition and in place.

Check breather tube from crankcase to air filter base is not cracked or damaged. Check the gasket between carburetor and air filter base is in place and properly oriented.

Parts diagram reference below.

https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/briggs-stratton/briggs-stratton-engine/100000-19z999-series/120k00-to-120k99/120k02-0110-e1

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