ueww40
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Boy did I screw up!!!!
I have an Excell VR2500 pressure washer powered by an B&S 6.5 HP 123K12-0134-E1 engine, which just wouldn't start after sitting for a couple of years. I did not expect the 1/2" brass screw that holds up the float bowl to actually be a jet and thought it was plugged up and put a drill to it (yep I did. Stupid is what stupid does). Now I need a new main jet. My problem is I have several numbers to pick from. One is 498978 and the other is 498981. Also on top of the head of the jet is a number stamped on, which is 77. What does that number mean and is it important?
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SRTsFZ6
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Re: Boy did I screw up!!!!
2024/06/26 14:32:37
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ueww40
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Re: Boy did I screw up!!!!
2024/06/26 15:20:26
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Thanks. What does the 77 mean on the head of the jet? Is it significant?
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SRTsFZ6
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Re: Boy did I screw up!!!!
2024/06/27 19:18:38
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I'd guess the jet size.
Does your original have a # stamped on it?
I don't re-call seeing #'s stamped on the jets and I clean MANY carbs, especially Briggs.
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ueww40
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Re: Boy did I screw up!!!!
2024/06/27 19:52:32
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SRTsFZ6
I'd guess the jet size.
Does your original have a # stamped on it?
I don't re-call seeing #'s stamped on the jets and I clean MANY carbs, especially Briggs.
Yes, that's why I attached the picture. Click on it and the number will clearly show. Yes, I am pretty sure it denotes the jet size but I am curious about what it actually means
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ueww40
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Re: Boy did I screw up!!!!
2024/07/01 15:50:53
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The main jet issue has been fixed, I got a brand new carburetor for less than just the jet. I tested it for about 15 minutes and it ran great. So the next day I got ready to do some serious pressure washing and it wouldn't start at all. So weird. I finally traced it down and noticed that I didn't have a spark on my plug. I tested it with a different plug and I had a spark just fine. Went back to the old plug - no spark. Now my nightmare begins. I pull up the parts manual for this particular B&S engine and the plug it says I need for this engine doesn't look at all like the old one. The mandated one (#697451 EMS or #796112 resistor) has a tread depth of about 10 mm whereas the old plug is about twice as deep, about 20 mm (see picture). Now remember this plug has been in this engine for a good 10 years without any problems but I immediately went to measure to piston clearance at TDC and the tip of the plug when I realized that I am poking around in some chamber, because as I move the piston up and down the wire I stuck through the spark plug hole is not moving up and down with the piston. I looked in there with a flash light as good as I could and I can clearly see some kind of a chamber where the plug is and off to the left I can see the piston. I go back to the parts manual to check out all the possible heads and according to my engine code 050727 FA, head #594989 is the right head, but nowhere do i see any kind of a chamber. So now I am totally confused and have no clue what to make of all of this. I double checked engine model number and code and they are correct. Help!
post edited by ueww40 - 2024/07/01 16:01:04
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SRTsFZ6
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Re: Boy did I screw up!!!!
2024/07/02 07:56:39
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SRTsFZ6
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Re: Boy did I screw up!!!!
2024/07/02 08:00:30
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ueww40
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Re: Boy did I screw up!!!!
2024/07/02 12:56:47
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In the meantime I informed myself a little better about the B&S small engines and I have some answers to my own questions. Without removing the cylinder head I now know what it looks like in there. What I thought was a chamber was actually the top of a valve and what fooled me was the fact that I can move the piston and the valves don't necessarily move at that time. Yes, the parts manual is clear about what spark plug to use and it is a short plug not longer than about 10 mm and the one that was in the engine was twice as long. Scary, but apparently it worked all these years. Normally with a plug that is about 10 mm longer than what it should be either the piston or the valves will hit it, but apparently there is enough clearance. But regardless, i will put the proper plug in it because the manual says so. Maybe I will treat it to a E3.10 plug instead of the Champion RJ19LM
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SRTsFZ6
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Re: Boy did I screw up!!!!
2024/07/02 18:46:47
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Yep, some engines the longer plug may not hit.
It was definitly the wrong one... I'd put the Champion in myself.
Gap at .030".. Just my 2 cents.
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ueww40
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Re: Boy did I screw up!!!!
2024/07/03 14:53:38
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SRTsFZ6
Yep, some engines the longer plug may not hit.
It was definitly the wrong one... I'd put the Champion in myself.
Gap at .030".. Just my 2 cents.
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Thanks for the 2 cents. What is the gap would have been my next question
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SRTsFZ6
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Re: Boy did I screw up!!!!
2024/07/03 16:47:40
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Beat ya to it!
The gap should be pretty close to it out of the box...
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