exhaust drool

[tvrc18]

My steel tanker with a circle f pipe tends to drool oil out of the pipe around the exhaust flange especially when first starting it after sitting for a while. Has anyone tried high temp silicon around the pipe to stop this? Most 2 strokes seem to drool a little in this area it seems. I run yamalube at 32 to 1 and use race fuel and jetting seems good. I just hate the mess it makes or would not worry about it.
Terry

[Larry Perkins]

Terry,

Hi-temp silicone works great making a seal and there is also some hi-temp putty called Chamber Seal I have used.  I think 40 to 1 might be better but it will not eliminate the drool as that is caused from a bad sealing of pipe and flange.  40 to 1 just burns a little cleaner.  I also think Belray MC1 burns cleaner than Yamalube.  My 2 cents worth.

Larry P

[firstturn]

I know this will shock people, but I disagree with Larry.  Keep running Yamalube @ 32:1 and don't worry about the drool.  Period.[]

Ron Carbaugh

[Dwight Rudder]

I have 2 favorite 2 stroke oils.  MC1 is one that I avoid and Team Green has long advised against.  MC1 is the only oil that I have used and have had crankshaft failure.  Kawasaki had a rash of crank failures on KXs and traced it down to use of MC1 at 50:1.  Any richer and it stops up everything. Very dirty oil .
My favorites are :
Maxima Super M.  Clean burning and very good at 40:1 mix.  You can use at 36 or even 32:1 for MX if you like.
The other is recommended by Helmut "SPEEDY" Clasen. That is Optimol Opti2.  Most motorcycle shops in the USA don't carry this but Small engine and lawn and garden shops do.  Speedy mixes at 100:1 and has had no problems.  I mix it at 80:1 in my 100cc and 125cc Hodakas. Clean burning and never a issue.  I just can't make myself mix at 100:1.  
Dwight

[Larry Perkins]

Everyone likes different oils and mixtures and this debate has come up before.  In 30 plus years of useing Belray I have never had a motor failure.  Hardly ever have fouled a plug either.  I think any of the modern oils mixed properly will work, though.  In the mechanics department as a mechanic I saw more motor failures top and bottom from KX Kawasakis than any other bike by far, so I don't know how reliable Kawasaki's advise is anyway.

Instead of everyone hashing out their oil and mixture preference again we should just right off the bat agree to disagree on that one.  I should have known better than to bring it up.  

Regardless, your main question about sealing I hope is answered.

Larry P

[Steve Minor]

I'll side with Larry on this one. Each one of us has a favorite oil and ratio. But just remember what Robert Duvall said in the movie Apocalypse Now: "I love the smell of Klotz Bean Oil in the morning"...or something close to that.



Steve Minor
Wilmington, NC

[Larry Perkins]

Steve,

Excellent and very humorous!:D

Larry P

[tomale]

I am amazed that you were able to run Yamalube at 32:1 in a 125. Most everyone I know that is useing yamalube foul plugs when running it that thick in a 125
there are lots of good oils out there, the trick it to run something that works for you. And I think it is important to find an oil that helps your bike to run a long time between top end rebuilds. I changed oils on my Maico 400 and I got just about a year on a rebuild. I am now running a Castrol and it seems to be working better, I will let you know how it works long term....rebuilds are expensive, more expensive than the savings of running cheap oil.


Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)74'
250 hare scrambler (project bike)

[tvrc18]

I have run Yamalube R 32 to 1 for probably 32 years and never had problems. They have changed the formula I think in the past few years it seems but still works ok for me. I think for a 125 you need more oil as you tend to rev the dog out of a small bore. I think using race fuel helps not foul plugs, that pump gas with the 10% methanol does not seem to work in 2 strokes at least from my experience. I may try 40 to 1 down the road, would love to try a bean oil for the smell,too. I have many cans of Blenzoil, Castrol R and Castor 927 but that stuff is way to nasty for carbon build up. Worked ok when you replaced top ends every week end.Terry

[PJM]

Well, once again Larry Perkins has hit the nail directly on the head based upon what I just discovered this week when I went to prep my new Circle F exhaust for my steel tanker. I suspect the problem is not the oil ratio of, but the seal between the pipe and exhaust flange/port.  

I discovered that although the pipe looks great there was one major flaw with the reproduction of the pipe...Kevin did not reproduce the inlet of the pipe correctly.  The origianl pipe inlet has an inner 40 mm pipe/sleeve that goes inside the flange, through a snug fitting round copper manifold gasket and into the exhaust port.  The outter sleeve fits nicely on the outside of the exhaust flange.  When snugged up, this design forms a nice double seal without the need for silicone or any other type of sealant.  My Circle F pipe has only an outer sleeve that fits rather loosely on the outside of the exhaust flange. That will cause the drool! The fit is almost like placing a size 12 shoe on a size 10 foot.  I had a more fitting (no pun here) analogy that I wanted to use, but did not want to offend anyone.

For those of you who have a Circle F pipe, do you also only have the loose fitting outer sleeve at the pipe inlet?  In the mean time I have located an automobile hi-performance exhaust specialist near me and he is going to fabricate the inlet based opon the previous pipe and the exhaust flange. For those of you who have only the outer sleeve, you may want to do the same instead of using high temp silicone.

Pat

PJM

[dirtbike]

My bikes never drools and you can stick a finger into the silencer and it will only come back out with a little ashe. No unburnt oil.

I only use TC-W3 outboard oil since the early 1980's. Never any problems and the engine is clean inside.

I won't recommend it to anybody because your oil is better but I'll go on. What I do have is: no wear, no slobby oil drooling all over, no smoke cloud when starting, no cylinder glanzing and no fouled plugs.

[socalmx]

Yamaha R 32 to 1 in my 125 and never had any fouling problems. .

[tooclose racing]

I mounted a Circle F to my 72 125 6B motor and immediately noticed the design difference that you talk about.  I have not observed any drool (I run the Maxima Super M at 40:1, maybe even a shade leaner...[])but what I did notice is that it's noisier at the exhaust manifold/pipe junction, not exhaust noise but mechanical "rattle/ringy" noise.  I concluded that it's just not as snug of a fit with the outer sleeve (and no inner).

But boy, does she go fast with that pipe (supposedly the Circle F is modeled after Carl Cranke specs...).