Try local dealer & see what he get's for plunger or goto jacks small engine,outdoor distributors & other online dealers,see what they get for plunger & shipping,also try going to ebay & type briggs 298125 in search compare prices for plunger/shipping against what local dealer,other online dealers get.I don't buy parts from partstree,only use website as a parts reference,their parts prices/shipping too high.
As far as plunger seal,as I said before seal may be age hardned & tight in block due to heat,you might have to damage/destroy same to remove,as to myself I would replace plunger & seal as seal may be worn & leak with new plunger,after that if you still have problem that you can't set point gap eng will will have to be opened & cam lobe for plunger checked.
The solid state megafire unit works on most briggs eng,although I've had 2 eng(3.5 & 4 hp) it didn't work on even reversing connections on unit,you might want to take a shot at one of these units if cam lobe the problem.
Goto link below & type 31-8786 in search.I've had good luck with these units,although as I said I had 2 eng it wouldn't work on.I don't know what they get for megafire units on ebay,you'll have to check.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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