Muffler Sealant

[snowman72]

Anyone found a good sealer for the Y pipe connection to exhaust pipe on 2 stroke snowmobile engines?

 

[ezra]

RTV black
in fact used it today.
y pipe to jugs.
y pipe to main pipe both sides of doughnut.
pipe to can both sides of doughnut.
all black
can outlet to belly pan exit.
bead on all springs.
all orange .mainly cuz I was out of black

 

[snowfreak56]

I would use the gold high temp.

 

[jccams]

Ezra...I've heard of the bead on the springs before, what is the purpose?

 

[snoduke88]

RTV take small vibrations out of springs, helps a lot on yamaha ex springs.

 

[snake]

Ezra...I've heard of the bead on the springs before, what is the purpose?

keeps springs from breaking

 

[indy_500]

RTV take small vibrations out of springs, helps a lot on yamaha ex springs.

keeps springs from breaking

more or less vibration! Springs won't really break unless they're 20 years old and rust in half! LOL I stopped doing it because the springs look like crap, the silicone falls off half the time and ends up in my belly pan, and i never really noticed any vibrations coming off them. A spring is $3 a tube of silicone is $4 haha

 

[srt20]

I used to lose exhaust springs in one particular location just about every ride. Put silicone on it and haven't lost one since. Been 4 years. Just a nice little bead. Not need to make a crap mess out of it.

 

[jccams]

What exactly is the RTV to use? I was at the auto parts store looking and found nothing with a heat rating higher than 650 degrees, doesn't seem like that is enough.

 

[srt20]

What exactly is the RTV to use? I was at the auto parts store looking and found nothing with a heat rating higher than 650 degrees, doesn't seem like that is enough.

That should be fine. I used black because that's what I had. No idea what the temp rating is. Your pistons will be liquid before those springs get 650*.

 

[Trees4Traction440]

get the Ultra Black, It has higher temp rating...not sure how much more off hand but it is higher, go through a tube a week usually this time of year, bought it in caulk gun size tubes now lol

 

[jccams]

Was actually talking about using it on the y-pipe to pipe and pipe to muffler connections. Thought the exhaust got a lot hotter than 650 degrees.

 

[ezra]

yeah it gets hotter 1300 on a reg biases

- - - Updated - - -

dont tune to that number .I will shoot for 1250 max just to be on the safe side.
a few of my old drags would see 1400+ with nos but that was never more than 500ft

 

[srt20]

Yeah the exhaust gases are hotter at WOT, but the outside of the exhaust pipe is not that hot. Especially a stock pipe. If you are not WOT your exhaust temp will not be near 1300*.

Here's an example, if the temps outside the pipe got that hot, how long do you think your hood would last? Or the plastic caps on the exhaust valves? Or the biggest yet, the food in your muffpot?

 

[srt20]

Btw I've never lost a spring from the y pipe to the pipe. It's always the springs from the pipe to the can. The can moves a lot easier than the pipe or the engine.

 

[ragsled]

I am a firm believer in the RTV on the springs, I had a 1998 Machz with Dynoport pipes that I would break at least one of the pipe to y-pipe springs a day. I used to carry a half dozen spares to get me through a weekend. I started laying a bead of RTV down them and never broke another. Some pipe-y-pipe fittings just get a certain frequency vibration going and the springs just shatter, kind of like the old is it live or memorex commercials.