REPLACEMENT CARB FOR 520H

[GATOR MIKE 0]

I am getting the 520H snowplow ready for winter and I am replacing or rebuilding the carb.  It has a 146-0698 with accelerator pump on it now but the repair manual calls for a 146-0430 no pump.  Which is better for a replacement or should I just rebuild the 0698 and leave it on?  Thanks

[Ed Kennell 47,767]

 to the  Mike.      Why do you need to rebuild or replace the carb?    Mine surged badly and needed 1/2 choke to keep running.

 

I cleaned it several times and it has been running perfectly for many years.

[Handy Don 17,644]

3 hours ago, Ed Kennell said:

cleaned it several times

Yep. Same here and the last time I broke down and removed the Welch plug to clean behind it (hint, hint). 

[GATOR MIKE 0]

5 hours ago, Ed Kennell said:

 to the  Mike.      Why do you need to rebuild or replace the carb?    Mine surged badly and needed 1/2 choke to keep running.

 

I cleaned it several times and it has been running perfectly for many years.

I was getting a lot of gas in my oil.  Posts told me it could be from fuel pump diaphragm or from stuck float/needle valve in carb.  So decided to do a total rehaul - new votage reg., new coil, plugs, oil, filter and rebuild or replace carb?  Thoughts?

[sqrlgtr 4,159]

Went through my 520H a few months back. Mine surged bad but it was due to the 2pc manifold leaking where it goes together. I rebuilt carb, fixed manifold, decarbed everything and adjusted the valves (probally forgetting some stuff)  while had all the tins and stuff off. My carb was the one without the accelerator pump and everything I read about you would be better off without the accelerator pump carb so if I was going to replace your carb with another I would find one without the pump. Rebuilding mine was prety straight forward but I dont know about one with the accelrator pump. It is my understanding the carbs will swap from one to another. Here is a few pics for reference that might help ya.

[Handy Don 17,644]

26 minutes ago, GATOR MIKE said:

total rehaul

I’m too frugal to replace parts until I’m sure they’re kaput.

Yes, it is possible for a leaking fuel pump diaphragm to introduce fuel into the crankcase. Caught early, the likelihood of damage is slight. A replacement diaphragm or pump is not a difficult repair.

Oil change and new filter? Absolutely 

Voltage regulators do fail but preemptive replacement? Not something I’d do. 

Aftermarket carbs are available for the P220, but by the time you’ve removed the carb you’re most of the way toward a thorough cleaning. Unless there is internal corrosion or evidence of other irreparable damage, a cleaning with a standard rebuild kit install would be my starting point. Plenty of posts here cover being thorough, including getting under and replacing the Welch plug.

Coil? if you have spark now, no.

Plugs. Sure if it’l make you happy.

Plug wires? If there is any sign they are not doing the job then yes. 
Transaxle oil change and filter? Probably unless you know oil is in good shape and proper filter is less then 50 hours old.