how hard is it to rebuild?

[The_Dealer]

not power valve but the diaphram in the fuel pump

 

[schmoo]

the power valve in the bottom of the carb can do that too.
through the hose into the intake, into a cylinder, into the oil.

 

[mornin151]

powervalve? If this power valve is the same thing you would find on a sled, quad or bike im not that stupid. That power valve runs off a spring tension counter weight or electric servo or another source to change the shape of the exhaust port to make the power cure more ride able and give you more low end and take from your top end. I know that this truck doesnt have one of those.

 

[Big Jim M]

If it's got a carb it's got a power valve! Carbs gotta have em! Like you said they make the power curve work!
But the leaking carbs do is mostly confined to the little LEAD PLUGS that are pounded into the drill openings in the body of the carb.
That said I've never seen oil level rise from the small amount of fuel that has leaked out of them little leaks. Mostly they are bothersome because they allow the carb bowl to lower or even empty overnight.. So when attempting a start, the engine has no fuel until the pump fills the carb bowl.
Big JIm

 

[mornin151]

sorry didnt see page 2. i thought he was trying a blinker fluid type thing...

 

[85_Ranger4x4]

powervalve? If this power valve is the same thing you would find on a sled, quad or bike im not that stupid. That power valve runs off a spring tension counter weight or electric servo or another source to change the shape of the exhaust port to make the power cure more ride able and give you more low end and take from your top end. I know that this truck doesnt have one of those.

Exhaust port?

I am no 2 stroke atv expert (even my dirt bike is a 4 stroke), but there is nothing on any carbed engine I have been around that changes anything in the exhaust port.

http://en.wikipedia.org/wiki/Carburetor#Power_valve

 

[kimcrwbr1]

The power valve on a carb closes with vacuum pressure and the engine runs on the jets. When you give it gas that is what the power valve does. when it loses vacuum pressure it it opens and fuel is bypassed past the jets. It is on the bottom of the float bowl so if the diaphram gets ruptured it will either drain the fuel in the carb dry directly into the intake past the valves and rings into the crankcase. In some cases the vacuum will pull fuel out of the bottom of the float bowl when its running flooding the engine but wont leak until vacuum is present. Its job is to add fuel to the venturies too high of float level will will also drain off until there is no pressure left from the pump when the engine is off and give a rich condition when it is running. The dry float setting is just to get it going you want to set the wet float level before you make any carb adjustmens for performance.

 

[mornin151]

Exhaust port?

I am no 2 stroke atv expert (even my dirt bike is a 4 stroke), but there is nothing on any carbed engine I have been around that changes anything in the exhaust port.

http://en.wikipedia.org/wiki/Carburetor#Power_valve

not being rude but just let it going, I know what im talking about with the 2-stroke. trust me i can prove you wrong,I have alot of time money invested in my honda 250R and i have a Cr cylinder on there with a Powervalve on it. I will make a huge long video on it if you need me to, because they do it all the time, every cr kx rm ya motor from 90's up has a powervalve. some of the 80's do also. but i will prove you wrong its a very simple design and you can do it.


I just had to replace the carb on it cause my other one was broke, it was cracked so i might have to look in to seeing if this one is set wrong or something he said he had it rebuild.

 

[Eric Kropp]

Exhaust port?

I am no 2 stroke atv expert (even my dirt bike is a 4 stroke), but there is nothing on any carbed engine I have been around that changes anything in the exhaust port.

http://en.wikipedia.org/wiki/Carburetor#Power_valve

There is no such thing as 4 stroke dirt bike. Two stroke only...Old school.

Eric

 

[85_Ranger4x4]

not being rude but just let it going, I know what im talking about with the 2-stroke. trust me i can prove you wrong,I have alot of time money invested in my honda 250R and i have a Cr cylinder on there with a Powervalve on it. I will make a huge long video on it if you need me to, because they do it all the time, every cr kx rm ya motor from 90's up has a powervalve. some of the 80's do also. but i will prove you wrong its a very simple design and you can do it.


I just had to replace the carb on it cause my other one was broke, it was cracked so i might have to look in to seeing if this one is set wrong or something he said he had it rebuild.

Like I said I haven't been around a 2-stroke atv much. But my Ranger I have, and the only called a power valve on it is in the carb. The piston is just a piston.

There is no such thing as 4 stroke dirt bike. Two stroke only...Old school.

Eric

I suppose a dual sport is the more correct term. It isn't really a dirt bike and it isn't really a street bike. I only ride it offroad and so I rather than explain to everybody what a dual sport is I just call it a dirt bike. That is all I use it for and just about everybody has something of a grasp about what that is. It is a '76 Honda XL-350, so as far as being old school it has at least the old part pretty much nailed...

http://img.photobucket.com/albums/v623/85_Ranger/1976 XL-350/100_1335.jpg?t=1294412854

 

[mornin151]

no worrys many like i said i thought you were trying to play a joke on me or something and i didnt see the next page,

but the powervalves are on 2 strokes only and not all of them have them.. alotof them do though

 

[85_Ranger4x4]

I think we have a case where the same term is used for two very different things.

Regardless, I am going to go with The_Dealer and say that a bad fuel pump could put a lot of fuel in your oil, more than a a little dribble from your carburetor.

 

[Eric Kropp]

After reading this over again and the major discussion about power valves and my personal dislike for four stroke motorcycles....I think you need to drain the engine of oil and coolant and drain the radiator and start all over again and see once both are filled with correct fluids you can see if the levels change again. You could also have a closer look at the drained oil. I just read where you said it doesn't smell sweet and it looks like oil...causes me to thing more on the line of fuel mixing with it. Fuel would just blend and thin it out.

Eric

 

[dangerranger83]

Helping to answer the question......

Ive seen guys that have had no experiance with rebuild top ends do it easily, took them sometime but they did it and couldnt be more proud of themselves. Just take your time, do your research and you will be able to do it.........if it comes down to doing it that is.

 

[The83RangerMan]

i had gas in my oil

i have a 2.8 in an 83 and when i started driving it i had carb issues ended up with about an inch inch and a half of gas in oil just rebuild the carb and change oil+filter