Oil coming out of the silencer.

Oil coming out of the silencer.
Posted by Protoolsuser81 on 31 Dec, 2013 19:28
It's gas and oil mix coming out of the tailpipe. Does this mean the main jet is to big?

#1 Reply
Posted by GrkGuy on 31 Dec, 2013 20:15
sounds like the packing needs replaced to me

#2 Reply
Posted by Protoolsuser81 on 31 Dec, 2013 20:36
It's also making a mess all over the front of my engine as well. All this is from the packing in the silencer? I thought my case had a leak but then realized its gas and oil all over the front of the engine. Then I checked the tail pipe and realized it was dripping from there as well. Not a jetting issue huh?

#3 Reply
Posted by Dezsled on 31 Dec, 2013 20:51
Well that's a symptom of what you described. Yes it can be jetting related.

If your thinking jetting you need to read the plug.

Afew factors to think about: how old us your premixed fuel? When was the last time it was ran? Clean air filter? What's the compression?

#4 Reply
Posted by Protoolsuser81 on 31 Dec, 2013 21:34
I purchesed this used a few weeks back. The top end was blown and I just got it all back together and this was my first run. Fuel and oil is brand new, the pipe I cleaned out and powerwashed the inside. I'm running a 32-1 mix and the main jet I used was a 280. The k@n is mounted right off the carb and was a little dirty and I will clean it tomorrow. I had the head cleaned up by my local shop so the compression might be higher then normal because of being milled down or whatever its called. I will check that tomorrow as well.

What should I do if the compression is high? Also what is a acceptable level?

#5 Reply
Posted by GrkGuy on 31 Dec, 2013 21:43
well pull plug and tell us what it looks like. but i would change the packing.

got any insulation at your house, if so use it. it wporks fine, just does not last as long.

i would bet there is none in your silencer,

#6 Reply
Posted by Protoolsuser81 on 31 Dec, 2013 21:52
I bought some repacking today already and planned on doing that tomorrow as well. I pulled the plug a few times while doing a heat run and then letting cool down but I'm not sure exactly what it should look like. Any pictures of good and bad you could link me with for the plug test?

#7 Reply
Posted by Rider414 on 31 Dec, 2013 22:14
If premix is coming out of the end of the pipe after warm up and running it, its pretty damn rich.

Run it again, shut it off and pull the plug right away. See if it is wet with premix. Post some pictures.

#8 Reply
Posted by Protoolsuser81 on 31 Dec, 2013 22:16
Will do.

#9 Reply
Posted by Protoolsuser81 on 31 Dec, 2013 23:30
I could use.some carb setting help.as well. The big screw on the carb you tweak by hand needs to be turned all the way in for it to idol. What is the other little screw below this one that you need a little flat head to turn and what should that be set and when should it be tweaked? Also my needle is set at the middle.slot which I belive is the third notch down. When should this be changed and what does going up or down change?

#10 Reply
Posted by Dezsled on 01 Jan, 2014 07:14
I'm not familiar with the stock carb since mine had a pwk39 when I bought it.

Here's a guide to help you understand what the functions of the carb itself, and they sell any parts you might need

http://www.sudco.com/Carburetor02.html

#11 Reply
Posted by BadMoonRacing500 on 01 Jan, 2014 13:17
The little screw is your pilot air screw. Factory setting is 1 1/4 turn out from bottomed out. The big screw is your slide height screw. If you have it turned all the way in just to idle your pilot jet is to rich. Find out what size pilot jet is in it. The carb slide screw should only be turned in enough to get the slide 1-2mm open at idle. Your main may be rich as well, but until you have the slow speed circuits right I wouldn't change it. The only other thing I can think of is possibly the needle jet is worn, it will totally mess up your you tuning on all throttle circits. Set the pilot screw first, then find out what pilot jet is in it and we can go from there.

#12 Reply
Posted by MotorGeek - Jerry Hall on 01 Jan, 2014 15:49
If it runs well and does not miss-fire, the jetting is not excessively rich. It takes a lot of combustion heat and heat in the exhaust system to burn the two stroke oil. The only way to keep heat in the pipe is by riding the bike hard. If you spend the majority of your time at low RPM and partial throttle you will always have oil dripping out of the exhaust flange and muffler even when the jetting is spot on and running a 50:1 premix ratio.

The LTs were not designed to be used as putt putt putt quads. That is what 4 strokes were designed for. If you are running stock carb a 280 main jet should be too lean.

#13 Reply
Posted by Protoolsuser81 on 01 Jan, 2014 15:50
Awesome info guys!

I did a full carb rebuild and I want to say the pilot was a 30 but I'm just going off memory. I dropped the main jet down to a 260 today (it's very cold here in Michigan) and it still seems pretty rich when reading the plug.

Quick question….Do i need to adjust the long needle that is attached to the slide up or down with that clip and what does that do exactly?

#14 Reply
Posted by Protoolsuser81 on 01 Jan, 2014 16:04
Also…I have a Fmf turbine core silencer and I couldn't get in the back half where the turbine is when I was repacking it today, because it has rivets, and I have no tools for this. I did repack the front half though, however I'm still getting oil out of the front manifold (all over the front of my engine) and also out of the end of the pipe a bit. Nothing crazy out of the pipe but when you rev it you can see it on the snow and it drips when I park it. It was even blowing some oil out of the rivets on the silencer as well. The worst part is right out of the manifold where the pipe just slips over.

I wish there was someone who could make these for a lt250r. http://www.eddie-sanders-racing.com/product_p/billet%20exhaust%20flange.htm

#15 Reply
Posted by MotorGeek - Jerry Hall on 01 Jan, 2014 16:14
Quote from: protoolsuser81 on 01 Jan, 2014 15:50
Awesome info guys!

I did a full carb rebuild and I want to say the pilot was a 30 but I'm just going off memory. I dropped the main jet down to a 260 today (it's very cold here in Michigan) and it still seems pretty rich when reading the plug.

Quick question….Do i need to adjust the long needle that is attached to the slide up or down with that clip and what does that do exactly?

Be careful trying to jet the carburetor by "reading" the spark plug. I have many 55 drums full of burned pistons that customers said that the spark plug indicated their jetting as safe. Cold weather requires the jet sizes to be increased not reduced in size.

#16 Reply
Posted by GrkGuy on 01 Jan, 2014 17:20
better start riding it harder...

#17 Reply
Posted by Dezsled on 01 Jan, 2014 18:08
Quote from: MotorGeek on 01 Jan, 2014 16:14
Cold weather requires the jet sizes to be increased not reduced in size.

Cold contracts heat expands. If it's cold increase your main jet one size for every so many degrees.... I don't know the formula... being from so cal where if it gets colder than 40* the girlfriends high beams come on

#18 Reply
Posted by Protoolsuser81 on 01 Jan, 2014 18:11
Quote
Be careful trying to jet the carburetor by "reading" the spark plug. I have many 55 drums full of burned pistons that customers said that the spark plug indicated their jetting as safe. Cold weather requires the jet sizes to be increased not reduced in size.

How does one tell if the jetting is correct if not by the plug? Needing bigger jets in the winter is something you learn pretty quick in Michigan. I'm spraying premix all over and mu plug is black and everything past half throttle is just bad (sputtering like its loading up). All these signs made me think the jet size needed to come down. 260 did the same still but it was a lot better.

#19 Reply
Posted by Rider414 on 01 Jan, 2014 21:14
Where are you at in Michigan?

We really need to take a few (maybe alot) steps back on this before you blow this quad up.

- What Model and Year Quad is this?

- Can you tell us what model carb is on it? Brand and any markings?

- What has been done to the this quad? Is it stock? Does it have a OEM airbox and filter? Can you post some pictures of this thing?

Nevermind - you said there is a filter right off the carb. Please confirm what carb and model is on this bike.

#20 Reply
Posted by Buckeye513 on 02 Jan, 2014 01:28
So I take it you ain't falling for the banana in the tail pipe trick?

#21 Reply
Posted by Chuckie25 on 02 Jan, 2014 07:16
You need to run the dog **** out of it one good time to really clear the bike out. Mine will spray out the silencer if I'm just putzing around, not really running it and my jetting is just a size fat and I run 32:1.

Plus, it's a 2-stroke. You're gunna have oil spooge on it unless you're running some crap walmart oil at 100:1 "cause race bike".

Drill out the rivets and use a nut and bolt if you have to. Go buy a rivet guns from autozone for $20 and you're set for as long as you own this bike.

For the leaky flange and coupling, use the copper coat rtv silicon stuff. Apply generously.

Go run the crap out of the bike.

Also, make sure you don't have too much oil/air filter recharged spray on your filter. That'll choke the engine.

#22 Reply
Posted by Protoolsuser81 on 02 Jan, 2014 09:55
I'm pretty sure its a stock carb on a 1990. How exactly do I tell what model it is on these?

#23 Reply
Posted by Chuckie25 on 02 Jan, 2014 10:11
Is it a 2 vent bodied flat slide Mikuni that fits perfectly in the boots? No extra slack, not too super tight? It's more than likely stock.