I too would doubt that just the valve guides would be the issue.
Being OHV they should be a lot less prone to wear than a side valve motor.
Without looking up the parts list, are the guides even a replaceable part??
There are lemon laws, i would check around in your state and find out if they apply to this engine you bought. Whatever consumer group that would cover it.
The govenor issue and now this supposed guide issue. When you get the engine back what warranty will be left?? Just the 3 month warranty from the shop that does the repair?? I would be asking for another 12 months or more.
You have had a bad run and it would not be unreasonable to expect that Briggs take the engine back and replace it with something that will outlive its warranty period and give a service life that would be expected of what is meant to be a quality product.
2 major repairs in 2 years and close to 100 hours. That is bad. A half the price chinese wonder would do better than that.
So after you get it back you could at best expect another 50 hours and under 12 months out of the engine.
Say if it did make the 3 year mark, what did it cost new?? im tipping thats more than $500 a year. Not good enough, im sure you could have got a contractor in to mow your lot cheaper than that.
