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Went and got the other plugs today from Deere and what a HUGE difference in the plugs. The plugs that were in there, were twice as long as the new ones. Im hoping the new ones are the correct ones. Something for people to note with these engines as up above, they put two different styles of...

Went to the John Deere dealer today and got the BMR4A NGK plugs and what a difference in size. The BPR4ES NGK is twice as long. If this shorter plugs are the right ones I cant believe that those other plugs didn't do anymore damage than what I can see. That doesn't say that the inside of the...

I have a 2000 John Deere 425 that I just purchased with a Kawasaki liquid cooled 20HP FD620D engine and I pulled the plugs to check them and the plug on cylinder 2 was smashed down and a indent on the piston. Cylinder 1 piston has slight contact with piston. BPR4ES factory gap is .030 and...

Ok I finished up mowing what I had to before tearing into the mower. The only thing I have done so far is took the plug back out on cylinder 2 I believe (thermostat side) and I noticed the prong on the spark plug is bent in towards the center piece of the plug and there is only .005 gap on the...

OK...had a chance to do the compression test on the mower today. The thermostat side had 175psi and would hold it for 8-10 min and the other side had in-between 180-185psi and would also hold pressure for 8-10 min. I never tried any longer, I figured this was long enough wait. The plug on the...

Hi everyone, First time user of this site and hoping to get some help on a 425 I just purchased. I bought this mower from a John Deere dealership that I had to make a 14 hr round trip to get. They had it listed for $1800 and it was a 2000, so that is why I drove so far to get it. I figured part...