Exhaust at head - self sealing ?

[hoogerbooger]

I used a sealer at the joint with the silencer, but decided just to push fit at the head on my B40... and on start-up it's clearly blowing a bit ( visible) at the push fit, and created a small trickle of black liquid after a minute or so.....at uneven idle.

(it's been stood up for ages)

I recall comments that any small gaps will soot up and self seal ?? ...which is part of the reason I resisted a sealer there.   Is this correct and is it a quick process ? how long idling  before I should start thinking a sealer is needed?

[rhyatt]

I use bathroom silicone sealer.
Smear around inside the exhaust port and a smear around the a dual pipe.
Snug and leak free

[Bigsingle]

I use hi-temp red .

[iansoady]

No need for high temperature stuff, as rhyatt says ordinary bathroom silicone is fine.

[hoogerbooger]

Comments noted. I have a high temp sealant ...so can do this.

But still interested to know if self sealing/coking up does should happen ?...and if it's a quick process.

(presuming push fit is only a little out of fit)

( if/ when I do use the sealant.....I'm only applying to the exhaust as I'm somewhat paranoid about bits of dry sealant later escaping inwards!)

[hoogerbooger]

Well to answer my own question it seems a small gap at the head will self-seal pretty quickly.

I ran it twice yesterday on idle for 5 mins. Was no visible (vapour)blowing, but a smaller amount of black liquid in the morning and none in the afternoon in the afternoon. Still the occasional flutter on idle.

This afternoon I moved the rose out of the way and used the oil can and a brush to get oil all the way round the pipe/head joint. Started it and no sign of bubbling. So looks like it sealed now.

So have just been up and down the Cul de Sac.

Acceleration on the new carb was great (minded that I'm a cyclist really). It seems to be running quieter with the same exhaust that previously %issed off the neighbour. I think as the result of resealing the joint at the silencer, which was my suspect and reason for removing the exhaust. But there is still the occasional flutter idling....even with the new carb...so still some head scratching to do.[but, I might even get round to riding it, rather than treating the bike in the garage as a challenge/grudge match that it's been winning. My biker work mates suggested I buy the bike some  25yrs ago...saying "even you could get this one to work"....well one day.....you've got to have a dream]

[maddogmargetts@yahoo.co.u]

i use high temperature liquid stove sealant. Works a treat.