420 mower broke something serious

   / 420 mower broke something serious #1  

trialsguy

Silver Member
Joined
Mar 14, 2006
Messages
118
Location
Kansas City Mo. area
Tractor
YM226D
Was mowing with my old worn high hour mower yesterday when it made a clunk noise and started vibrating bad and loss power. I got this mower a few years back and the hour meter is broke at 1700 hrs, Used a lot of oil and was very weak in taller grass, anyway I puled the the head today and it appears the piston is released from the crank a broken rod or something I can push it in but I cant grip it well enough to pull it out to see what broke. I have read on the net that there are a couple options to re-power my mower and I am looking for advice on where to get the best engine for the buck. Is there a rebuild kit that is reasonable from onan. Its a "B" series 20 hp onan. I live close to a small engine distribution warehouse downtown KC and a buddy works there so I will give them a call after the holidays to see what I can come up with. It would be great to drop a fresh strong engine in my mower but the cost may require me to save up for a while.
 
   / 420 mower broke something serious
  • Thread Starter
#2  
Ok so far in my local leg work I have located a pair of piston, rods and a gasket kit for a total of 600 bucks and that doesn't include machine work or bearings or valve work if I need it.
Does anyone have any experience in rebuilding a onan 20 hp and a rough estimate on cost. I haven't actually tore into the engine yet to see what all is busted.
 

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