searay175 Posted June 13, 2011 Report Share Posted June 13, 2011 I have a 85 ty350 that has a surging rpm problem. After it is warmed up it will take what seems like forever to come down off higher rpms to a near idle and then it will surge up and down somewhere between 600-1200 rpm. Did these 350's have a heavy flywheel back then that causes them to be so slow coming back down to idle? I have checked for air leaks on the intake and the carb has been cleaned as well as a new air filter. Could the crank seals cause this? It really seems to "hunt" to find a idle speed that is consistant. Thanks! Quote Link to comment Share on other sites More sharing options...
grahamjayzee Posted June 13, 2011 Report Share Posted June 13, 2011 Sounds very much like crank seals to me. Graham Quote Link to comment Share on other sites More sharing options...
charliechitlins Posted June 13, 2011 Report Share Posted June 13, 2011 (edited) The TY350 has a flywheel just slightly lighter than does a Ford 9N tractor, so it does take awhile to wind down. Sounds like crank seals, though. Wait for Stoodley (JSE) to chime in. I figure if there's anything he doesn't know about a TY350, it doesn't need to be known, Edited June 13, 2011 by charliechitlins Quote Link to comment Share on other sites More sharing options...
searay175 Posted June 13, 2011 Author Report Share Posted June 13, 2011 The TY350 has a flywheel just slightly lighter than does a Ford 9N tractor, so it does take awhile to wind down. Sounds like crank seals, though. Wait for Stoodley (JSE) to chime in. I figure if there's anything he doesn't know about a TY350, it doesn't need to be known, Quote Link to comment Share on other sites More sharing options...
searay175 Posted June 13, 2011 Author Report Share Posted June 13, 2011 I agree he seems to be very knowlegable on almost all topics. Thanks for the comparison on the the weight of the flywheel! Sometimes I wish it had a toggle kill switch rather than a momentary one. I have already ordered seals as it can't hurt. Quote Link to comment Share on other sites More sharing options...
charliechitlins Posted June 13, 2011 Report Share Posted June 13, 2011 I agree he seems to be very knowlegable on almost all topics. I'm pretty sure Jon has had his '86 TY350 since new! Quote Link to comment Share on other sites More sharing options...
lineaway Posted June 14, 2011 Report Share Posted June 14, 2011 Sounds like you could have an air leak somewhere and or the mains are bad. Yes, it has too heavy of flywheel. To make it sweet shave 12-14 oz off the outside of the weight. If you`d like to challenge your clutch you could remove the weight completely. Quote Link to comment Share on other sites More sharing options...
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