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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Peculiar goings on in an exhaust port!
Post Info TOPIC: Peculiar goings on in an exhaust port!
TTRfan


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Peculiar goings on in an exhaust port!
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I was just stripping out a cylinder head tonight and found a couple of very odd "things" under an exhaust valve - see photos below.

I thought first off they were shells but I crushed them and the walls were thick and crumbly - almost like rotten wood.

Any ideas what they are or were?

Brian

Odd things in exhaust port 1.jpg

Odd things in exhaust port 2.jpg



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ttboof


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Common over here 

Good old wasp nests 

Get them in my road jacket as it doesnt get used .

Also my old Yamaha jog scooter it was the first thing I'd check for little buggers would build a nest in the exhaust and block it 



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ttr steve


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Looks like you have your work cut out there Bri

 



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BM Steve


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I always thought those plugs you stick in an exhaust were for water biggrin



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2004 TTR250 - Highway Dirtbike Hand Guards, 38mm Bar Risers, D606 Front & Rear, Opened up Airbox with Twin Air Filter, Re-jetted Carby, B+B Bash Plate & Frame Guards, DIY 3mm Alloy Tail Tidy, 14/47 Gearing.

 
Kaos


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If it was down under i would guess a spider or wasp's nest??

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PlumasDude


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Looks like wasps to me. Reminds me I need a new epipen next season

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KMAN


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Yep wasp nest to me.

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Tarbone


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+1 on wasp nest!

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