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I just had the same problem with an old Kmart mower (MTD)' Fortunately the rim had 2 holes in it fairly close to the axle area. I was able to used these holes to insert bolts from the back side and use a puller to remove the rim. It may be possible to drill holes in yours to use as I did.

So why do you have to readjust the clearance? I have never had to increase the clearance when readjusting during routine maintenance. If the valve seats and/or valve sealing surface is worn it could cause the clearance to become less.

The quoted specs are a range .003 being the minimum and .005 being the maximum clearance. I usually go for the lower clearance of .003; normal wear will increase the tolerance over time