piston ring question

[86dr100]

im new to this site so any help would be greatly appreciated. i found an 86 dr100 and when i got it it ran for a few minutes then it started to die out and was pourin out a bunch of smoke. i was told it needed new piston rings. if this is true can any instruct me how to change the piston rings, as i am to broke to take it to a shop. thank you

 

[killerkx]

it probably needs a whole new top end piston, rings, cylinder honed or replated/sleeved

 

[76GMC1500]

A service manual will tell you how to change the piston rings. Also, inspect the valve guides for wear as that is also a source for oil consumption.

 

[86dr100]

thanks does anyone have a link to were i can get a manual ive searched the internet and cant find anything

 

[rmc_olderthandirt]

i found an 86 dr100 and when i got it it ran for a few minutes then it started to die out and was pourin out a bunch of smoke. i was told it needed new piston rings. if this is true can any instruct me how to change the piston rings, as i am to broke to take it to a shop. thank you

You found a dirt bike????

Okay....

Is this a two stroke? If it is a four stroke then I would agree that it is in need of rings, valves or something major. If it is a two stroke it might just need to get cleaned up a bit, although the fact that it was in a place to be found suggests that it wasn't very healthy. The fact that it started is a good sign and that the piston/cylinder can't be too bad.

Before I tore it apart I would run a compression test. If you get a reading over 100 I would run it as is, at least for a while to see if there are any other issues.

Two strokes smoke. If you have too much oil in the gas they smoke a lot. If the bike has not been warmed up and run reasononably hard then the oil can build up in the pipe and create a smoke screen when it does finally start to heat up.

If the compression checks okay I would recommend starting with fresh gas and a known oil to gas mix ratio.

Rod

 

[86dr100]

it's a four stroke and it was out front of a drive way with a free sign on it. its a little rust i rode it down the stree 1 after it idled for a bit on the way back up the street is when it started to die out and smoke

 

[76GMC1500]

Sounds like a float problem in the carburetor.

 

[86dr100]

ive done a little reserch but dont know how to take off the camshaft chain and put it back thats what im worried about i dont really understand the camsfaft chain and cam shaft gear and its held on by two bolts connected with a metal piece kind of like a washer but shaped like a horse shoe on the cam gear. do i unbolt the gear to release the chain and take out the cam and the valves? or is there a way to keep the sprocket attached to the cam? if any one can help me past this step please.

 

[Xtremesports445]

why exactly would u want to do that?

 

[86dr100]

how do i get to the piston to change the rings?
sorry, i dont know that much about dirt bike engines im trying to learn.

 

[86dr100]

i cant figure out how to get the motor apart to do so and they said i need to check the valves.

 

[76GMC1500]

It sounds like a carburetor problem, not an engine problem. You probably don't even need to take it apart.

 

[86dr100]

so what should i look for if its a carb problem? i was tryin to get it started and it sounds like it wants to go but it starts pouring out gas from the bottom of the carb through the hose