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Need a flywheel P/N cross reference (Briggs 21 hp Intek)

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cheltemes
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2025/05/17 16:01:52 (permalink)
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Need a flywheel P/N cross reference (Briggs 21 hp Intek)

I need a new flywheel for a 21 hp Briggs model 331877 0869 G5.  This is an Intek engine for a riding mower.  The parts manual says the Flywheel is 698281.  But, every website I search says that P/N 698281 is no longer available or discontinued.  I have searched to find what P/N replaced this one, but nothing is clear.  I'm looking for guidance on how to find the correct P/N flywheel which I can purchase for my machine.  I appreciate any assistance..  Thank you..
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    SRTsFZ6
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    Re: Need a flywheel P/N cross reference (Briggs 21 hp Intek) 2025/05/17 16:18:21 (permalink)
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    Seems there's several used ones on E Bay:
     
    https://www.ebay.com/sch/i.html?_nkw=698281&_sacat=0&_from=R40&_trksid=p4432023.m570.l1313 
     
    .

    Scott
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    cheltemes
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    Re: Need a flywheel P/N cross reference (Briggs 21 hp Intek) 2025/05/17 16:54:17 (permalink)
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    Thanks Scott - I'll checked those out and made an offer on one..
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    SRTsFZ6
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    Re: Need a flywheel P/N cross reference (Briggs 21 hp Intek) 2025/05/18 07:17:43 (permalink)
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    Plz post back how it goes.... :)
     
     
     
    .

    Scott
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    cheltemes
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    Re: Need a flywheel P/N cross reference (Briggs 21 hp Intek) 2025/05/24 08:22:18 (permalink)
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    Got the flywheel installed.  I'm at the end of a rebuild project..
     
    - When this repair started, I thought I had a camshaft issue - but camshaft was perfect. (compression release spring, lobes, all good)
    - The connecting rod was busted.  Had aluminum metal transfer to the crankshaft which I cleaned up.  
    - Replaced piston, rings and rod. Cylinder sleeve was good. 
    - Replaced the head / valve assembly with new assembly from Briggs.  That new assembly out of the box seemed all good to go so I put it on and confirmed the valve clearances.  I don't think I needed to do anything else with the valves..
    - The dots on the cam / crank gears are timed.  (I wish this was easier to double check, but I'm sure they're aligned)
    - Flywheel is in place with a new key in there
    - I just took off the valve cover and valves seem to be moving good.  Full strokes.  
     
    When I go to start it - it seems like timing is way off, or something similar to that.  While I hold the key, it fires, but there are huge back fires through the intake.  The air filter almost blows off.  It won't run.  
     
    I need something else to check...
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    SRTsFZ6
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    Re: Need a flywheel P/N cross reference (Briggs 21 hp Intek) 2025/05/24 08:52:32 (permalink)
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    First, did you compare where the "key to magnet placement" is VS the new part??
    IE: For instance, the  key at 12 o'clock, magnet at 3 o'clock.. Both are identical ?
     
     
    If, above is exact, it sounds like the timing is off.  
     
    First, is the coil on the correct way?  If upside down, it won't run right.
     
    Second, I suspect the cam dot to crankshaft dots are off.  Sometimes the dots are 
    SUPER SMALL and easily over looked.  Just removing the sump cover can allow you 
    to double check...   Don't use the squarish part of the crankshaft keyed GEAR for your
    alignment.
     
    You can check by watching the piston come up to TDC on the compression stroke.
    You should see the intake open just before, both closed when at TDC, and shortly thereafter
    exhaust open.
     
     
    .

    Scott
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    cheltemes
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    Re: Need a flywheel P/N cross reference (Briggs 21 hp Intek) 2025/05/26 18:28:14 (permalink)
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    Hi Scott - Ok - when I went back out to look at the detail of the flywheel I found that my "new" flywheel had already sheared the new key.  That was suprising to me because the engine hasn't even ran yet, just the back-firing I mentioned above.  I did check the new flywheel vs. my old one and they are identical.  
     
    So, then I thought the cam timing must be off.  I pulled off the sump cover and the dots are aligned.  And like you mentioned above it's not aligned to the crank key, just aligned to the little dot.
     
    Something else must be wrong.  What could cause the new flywheel / key to shear immediately like it did?  I could accept if the timing was off that could cause the backfire / sheared key.  But, the timing dots are good - so??  
     
    You mentioned about the coil -  I'm assuming it is correct because I haven't touched it.  Any other ideas - I'm wide open to check something else.  I appreciate your inputs..
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    SRTsFZ6
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    Re: Need a flywheel P/N cross reference (Briggs 21 hp Intek) 2025/05/27 06:34:27 (permalink)
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    That flywheel is probably supposed to be torqued to 100' lbs (I just had mine off).
    https://outdoorpowerinfo.com/engine_specs/briggs_fly_torque.asp 
     
    If it sheared that quickly, it likely wasn't tight enough. 
     
    For the main cover, rear bolts (1/4-20), remove one of them.  Insert a longer 1/4-20 bolt.  This will line up perfectly with the flywheel starter teeth.
    Gently snug down and then slowly apply your 100' lbs.   It won't break off the block, hurt the flywheel but may slightly bend the bolt-which will still come out... 
     
    You may also try adjusting the valves this way.(likely not your problem):
    When one is fully open, adjust the other (and vise versa).
     
    Re the coil, the kill tab usually is closest to the block.   
     
    Check and make sure you have spark at the plug, connect to the lead, ground the plug to the head.
    Look for constant spark..
     
    .
    post edited by SRTsFZ6 - 2025/05/27 06:40:25

    Scott
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