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  Red Hot Muffler
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   Author  Topic: Red Hot Muffler  (Read 666 times)
Snow Cruiser Man
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Red Hot Muffler
« on: February 21, 2017, 09:30:08 PM »
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This is not my motor well sort of. Last week two days before our 1 lunger race newbie to the sport comes into my shop I have a problem he has a 320 that they burnt the piston first question I had was lean? hole in the piston and scored on exhaust side. Asked what muffler on this beast he  said a Rotax muffler I said which one he said they all look the same but they are not and his had a baffle in it. I had that happen to me piston looked similar changed the the muffler new piston and a way we go. Now back to the title. So where do you find a 320 piston that is already 20 over on a Thursday night. So I have a 335 sitting on the floor spare engine because the 335 is a favorite of mine I said take it drop it in the sled and go. Race day they drive it around they think it is getting hot it is a warm day 5C. So they make a lap and the muffler is red hot? They let it cool down. Now they make another lap same thing the muffler gets red hot? Now my question is what causes it to get so hot? Plugged Exhaust? Timing out? They want to buy the motor from me but I would like to know what could be causing this condition. SCM
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Snow Cruiser Man
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Re:Red Hot Muffler
« Reply #1 on: February 22, 2017, 06:00:48 PM »
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Any ideas on why the muffler would get red hot?
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rkalter
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Re:Red Hot Muffler
« Reply #2 on: February 22, 2017, 06:05:55 PM »
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Quote from: Snow Cruiser Man on February 22, 2017, 06:00:48 PM   

Any ideas on why the muffler would get red hot?


I'm no mechanic,  but is it possible that it's running too rich and excess fuel heating muffler cherry red?? Just two cents worth from a backyard diy'er lol.
Ray
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1970 Skidoo TNT 292 Ratsled
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Green and Gold
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Re:Red Hot Muffler
« Reply #3 on: February 22, 2017, 07:25:34 PM »
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Glowing exhaust are typically associated with a too lean air-to-fuel mixture.    Excess fuel in a two stroke acts to cool things (for a variety of reasons....see this link for a better explanation http://bikemanperformance.com/tech-tips/fuel-tuning.html  )

Thing to consider: high speed needle is too far in/incorrect carb or main jet/air leak in the intake track, and the Omni present crank seals leaking possibility.
« Last Edit: February 22, 2017, 07:27:19 PM by Green and Gold » Report to moderator Logged
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