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post #1 of 55 (permalink) Old 02-12-2019, 02:18 PM Thread Starter
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Unhappy Exhaust? Heat Melting Plastic Seat

I purchased a used 2014 Rancher 420FM last year. I posted the other day about a exhaust pipe leak at the cylinder. I will be taking the quad to my mechanic next week for him to replace the crush washer to see if the leak will stop. Tightening the bolts helped the leak a lot.

I found another problem yesterday. I purchased a new seat, put it on and rode for about 4 hours, stop and go. I noticed my left upper leg was getting very warm towards the end of the ride. While taking the seat off I found that the left plastic tab is melted!!!(where it hooks to the frame). It's not the entire tab but enough that it's obvious something is going on to cause this.

This plastic seat tab is located above the exhaust.

The odd thing is that the OLD seat has only one tiny area that looks like it got too warm, but nothing like what has happened with my NEW seat.

What is causing the increased heat?? Is it the exhaust or the engine?? Could the 27 inch tires all around be causing this??

The only engine work done was rebore and rebuild of top end due to smoking and done my first rip-off mechanic. My new mechanic readjusted the valves and told me "they were not set right." It runs GREAT but I checked the spark plug last week and it was black with soot. It's running too rich from what I can tell.

I have ridden less than 30 miles since the top end was rebuilt. I ride mostly at low speed due to the terrain. Oil has been changed twice. New oil filter and air filter. Clean radiator with new fluid and fan works. No error messages.

Please help!
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post #2 of 55 (permalink) Old 02-12-2019, 02:36 PM
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Running rich will make them run hot , and you have a exhaust leak ----I put third degree burns on my leg riding with short pants and the steam from hitting the water got me good , be carful
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post #3 of 55 (permalink) Old 02-12-2019, 07:43 PM Thread Starter
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Running rich will make them run hot , and you have a exhaust leak ----I put third degree burns on my leg riding with short pants and the steam from hitting the water got me good , be carful
Thanks Fish! So it's a combination of those two things causing the problem? Got it. I hope my mechanic knows enough about the EFI system to fix the rich problem and has the equipment to do it.

I don't plan to ride it until it's fixed but thanks so much for the warning. Ouch!
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post #4 of 55 (permalink) Old 02-13-2019, 07:37 AM
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I wouldn't run it with an exhaust leak.....
I'm pretty sure running lean will cause the exhaust to get hotter and glow cherry red, not rich.
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post #5 of 55 (permalink) Old 02-13-2019, 06:17 PM Thread Starter
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I wouldn't run it with an exhaust leak.....
I'm pretty sure running lean will cause the exhaust to get hotter and glow cherry red, not rich.
Thank you!! I did some more reading and found what you said. That helps me a lot. Now, I guess it's down to the exhaust being the problem.
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post #6 of 55 (permalink) Old 02-13-2019, 06:23 PM Thread Starter
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I was able to get the exhaust off today. That was not easy.

Here is a pic of the old crush washer. Notice how it's crushed more on one side that the other?? From 12 to 6 o'clock there is a "lip" and it is flat on the other side. Was this caused by someone tightening down one side before tightening the other??? Or, does it indicate something else is wrong??

Just looking I don't see any problem at the connection to the head and the and the mounting bracket on the pipe does not appear warped.

I'm waiting to hear from someone before I install the new crush washer.
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post #7 of 55 (permalink) Old 02-13-2019, 11:15 PM Thread Starter
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Valentine's Day bump....plz see my post, above. I'm sitting here holding this crush washer in my hand waiting for your help.
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post #8 of 55 (permalink) Old 02-14-2019, 01:01 AM
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is this the same question as before? only in a different way? i havent been paying enough attention... you can leak exhaust from the head, as well as where the exhaust hooks up. usually the warmer the engine gets, the hotter the leak. just a suggestion. it still has to do with loose, or a faulty gasket. so can the crush washer, be the problem. which way did the exhaust leak point?

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post #9 of 55 (permalink) Old 02-14-2019, 04:03 AM
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I would make sure the flat end flange of the exhaust is clean and flat , maybe some emery cloth and buff it , clean out the carbon build up inside the head where the flange mates ,be sure the copper washer stays in place when you insert the flange , put it together and snug the bolts evenly , start the engine and let it get up to operating temp , then tighten the bolts ( to torque specs if you like ) ---see what happens , then go on from there !!!!
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post #10 of 55 (permalink) Old 02-14-2019, 07:10 AM
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I'm with fish

Did you verify that was where the leak was from?

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