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Posted: 9/30/2014 7:15:35 PM EST
[Last Edit: 10/1/2014 6:50:37 AM EST by Flatulence]
Can a carburetor issue cause exhaust smoke?

FBHO !!!!

'02 XR 100 R
Link Posted: 9/30/2014 7:18:07 PM EST
[Last Edit: 9/30/2014 7:18:55 PM EST by fxntime]
If it's running too rich it can. Color of smoke? Blue tint, oil, black, too rich, white, coolant if liquid cooled.
Link Posted: 9/30/2014 7:19:33 PM EST
absolutely. rich fuel, or sucking in oil from the crankcase vent.
Link Posted: 9/30/2014 7:20:34 PM EST


I don't think mechanical issues are the worst of your problems OP. Just sayin'
Link Posted: 9/30/2014 7:23:06 PM EST
[Last Edit: 9/30/2014 7:24:19 PM EST by speedfreak955]
Lemme guess, it's been sitting up and you had to turn the idle screw waayy up to get it to idle?
Now the idle hangs when you rev it. and it smokes and burns your eyes.
Again just a guess. I'm no expert but I've played one on the intraweb.
Link Posted: 9/30/2014 7:25:47 PM EST
Or it can be a bad crank seal...
Link Posted: 9/30/2014 7:27:42 PM EST
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Originally Posted By DS11M:
Or it can be a bad crank seal...
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He said it was a Diesel 4 stroke
Link Posted: 9/30/2014 7:30:07 PM EST
Make
Model
Size
Year

Without that information you might as well fart in the wind.
Link Posted: 9/30/2014 7:33:55 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By speedfreak955:

He said it was a Diesel 4 stroke
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Originally Posted By speedfreak955:
Originally Posted By DS11M:
Or it can be a bad crank seal...

He said it was a Diesel 4 stroke

Ahh, reading comprehension fail on my part
Link Posted: 9/30/2014 7:36:08 PM EST
[Last Edit: 9/30/2014 7:37:10 PM EST by speedfreak955]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By DS11M:

Ahh, reading comprehension fail on my part
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By DS11M:
Originally Posted By speedfreak955:
Originally Posted By DS11M:
Or it can be a bad crank seal...

He said it was a Diesel 4 stroke

Ahh, reading comprehension fail on my part

No problem man!
Someone will be along to kick me in the nuts shortly anyway
Link Posted: 9/30/2014 7:36:38 PM EST
so will using chain saw gas..& overfilling the crank case, loading up the plug, rings going bad, dropping the bike...
Link Posted: 9/30/2014 8:11:57 PM EST
[Last Edit: 9/30/2014 8:12:24 PM EST by DS11M]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By KA3B:
Make
Model
Size
Year

Without that information you might as well fart in the wind.
View Quote

What he said...
Link Posted: 10/1/2014 6:53:11 AM EST
[Last Edit: 10/1/2014 7:49:56 AM EST by Flatulence]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Ltlabner:
http://www.ar15.com/media/viewFile.html?i=67126

I don't think mechanical issues are the worst of your problems OP. Just sayin'
View Quote

I know you don't.

Original post updated.
Link Posted: 10/1/2014 6:56:19 AM EST
Is the smoke black or blue?
Link Posted: 10/1/2014 7:03:14 AM EST
[Last Edit: 10/1/2014 7:48:59 AM EST by Flatulence]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ch1966:
Is the smoke black or blue?
View Quote

Couldn't tell in the low light last night.
I'll run it again today and get back to you.

I'm thinking jeted rich. Oil on the plug.

On edit: The guy said the bike sat for a few years before he decided it was time to get it out of his garage. Could the rings be stuck and cause this as well ?

Pour a little Sea Foam in the plug and the case and let sit for a few hours. Then run it for 15 -30 minutes before changing oil ?
Link Posted: 10/1/2014 9:00:58 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Flatulence:

Couldn't tell in the low light last night.
I'll run it again today and get back to you.

I'm thinking jeted rich. Oil on the plug.

On edit: The guy said the bike sat for a few years before he decided it was time to get it out of his garage. Could the rings be stuck and cause this as well ?

Pour a little Sea Foam in the plug and the case and let sit for a few hours. Then run it for 15 -30 minutes before changing oil ?
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Flatulence:
Originally Posted By ch1966:
Is the smoke black or blue?

Couldn't tell in the low light last night.
I'll run it again today and get back to you.

I'm thinking jeted rich. Oil on the plug.

On edit: The guy said the bike sat for a few years before he decided it was time to get it out of his garage. Could the rings be stuck and cause this as well ?

Pour a little Sea Foam in the plug and the case and let sit for a few hours. Then run it for 15 -30 minutes before changing oil ?






If it has been sitting, there is a good chance gasoline has leaked past the float valve in the carburetor and down into the cylinder, making it's way past the rings into the crankcase.

This will eventually thin out the oil, as well as raising the oil level in the crankcase.


Drain the oil, put in fresh oil to the proper level and see what happens.
Link Posted: 10/1/2014 9:23:02 AM EST
Hell, just go through it and be certain. those little bikes are solid- new valve guide seals and piston/rings and it will

be GTG for your grandkids, or further! Just keep up on the can chain tension, dont let them slap apart and they will run forever.
Link Posted: 10/1/2014 9:30:51 AM EST
Get a 2stroke.

you're welcome
Link Posted: 10/1/2014 3:11:25 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By fook:






If it has been sitting, there is a good chance gasoline has leaked past the float valve in the carburetor and down into the cylinder, making it's way past the rings into the crankcase.

This will eventually thin out the oil, as well as raising the oil level in the crankcase.


Drain the oil, put in fresh oil to the proper level and see what happens.
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Originally Posted By fook:
Originally Posted By Flatulence:
Originally Posted By ch1966:
Is the smoke black or blue?

Couldn't tell in the low light last night.
I'll run it again today and get back to you.

I'm thinking jeted rich. Oil on the plug.

On edit: The guy said the bike sat for a few years before he decided it was time to get it out of his garage. Could the rings be stuck and cause this as well ?

Pour a little Sea Foam in the plug and the case and let sit for a few hours. Then run it for 15 -30 minutes before changing oil ?






If it has been sitting, there is a good chance gasoline has leaked past the float valve in the carburetor and down into the cylinder, making it's way past the rings into the crankcase.

This will eventually thin out the oil, as well as raising the oil level in the crankcase.


Drain the oil, put in fresh oil to the proper level and see what happens.

Blue Smoke.

Sea Foam added to the fuel and crank case. Ran the bike for 25minutes. Still blue smoke.

Added Sea Foam to the top of the piston and let it sit for a couple hours. Still Blue smoke.

Changed the oil. Still blue smoke.

Next up is compare jets with another XR 100R and if not that, I'll be putting a new piston, rings, guides.
Link Posted: 10/1/2014 3:33:27 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Flatulence:

Blue Smoke.

Sea Foam added to the fuel and crank case. Ran the bike for 25minutes. Still blue smoke.

Added Sea Foam to the top of the piston and let it sit for a couple hours. Still Blue smoke.

Changed the oil. Still blue smoke.

Next up is compare jets with another XR 100R and if not that, I'll be putting a new piston, rings, guides.
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Flatulence:
Originally Posted By fook:
Originally Posted By Flatulence:
Originally Posted By ch1966:
Is the smoke black or blue?

Couldn't tell in the low light last night.
I'll run it again today and get back to you.

I'm thinking jeted rich. Oil on the plug.

On edit: The guy said the bike sat for a few years before he decided it was time to get it out of his garage. Could the rings be stuck and cause this as well ?

Pour a little Sea Foam in the plug and the case and let sit for a few hours. Then run it for 15 -30 minutes before changing oil ?






If it has been sitting, there is a good chance gasoline has leaked past the float valve in the carburetor and down into the cylinder, making it's way past the rings into the crankcase.

This will eventually thin out the oil, as well as raising the oil level in the crankcase.


Drain the oil, put in fresh oil to the proper level and see what happens.

Blue Smoke.

Sea Foam added to the fuel and crank case. Ran the bike for 25minutes. Still blue smoke.

Added Sea Foam to the top of the piston and let it sit for a couple hours. Still Blue smoke.

Changed the oil. Still blue smoke.

Next up is compare jets with another XR 100R and if not that, I'll be putting a new piston, rings, guides.



Never used the stuff but doesn't Sea Foam cause smoke?
Link Posted: 10/1/2014 5:16:21 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Flatulence:

Blue Smoke.

Sea Foam added to the fuel and crank case. Ran the bike for 25minutes. Still blue smoke.

Added Sea Foam to the top of the piston and let it sit for a couple hours. Still Blue smoke.

Changed the oil. Still blue smoke.

Next up is compare jets with another XR 100R and if not that, I'll be putting a new piston, rings, guides.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Flatulence:
Originally Posted By fook:
Originally Posted By Flatulence:
Originally Posted By ch1966:
Is the smoke black or blue?

Couldn't tell in the low light last night.
I'll run it again today and get back to you.

I'm thinking jeted rich. Oil on the plug.

On edit: The guy said the bike sat for a few years before he decided it was time to get it out of his garage. Could the rings be stuck and cause this as well ?

Pour a little Sea Foam in the plug and the case and let sit for a few hours. Then run it for 15 -30 minutes before changing oil ?






If it has been sitting, there is a good chance gasoline has leaked past the float valve in the carburetor and down into the cylinder, making it's way past the rings into the crankcase.

This will eventually thin out the oil, as well as raising the oil level in the crankcase.


Drain the oil, put in fresh oil to the proper level and see what happens.

Blue Smoke.

Sea Foam added to the fuel and crank case. Ran the bike for 25minutes. Still blue smoke.

Added Sea Foam to the top of the piston and let it sit for a couple hours. Still Blue smoke.

Changed the oil. Still blue smoke.

Next up is compare jets with another XR 100R and if not that, I'll be putting a new piston, rings, guides.




Have you checked to see if this poor thing has an air filter in the air box?


Small bikes tend to be short on regular maintenance, previous owner might have tossed the filter, or it could have been dry rotted long before it was sat up the last time. If it has been ridden for any length of time with no filter, it would explain the excessive smoke.
Link Posted: 10/1/2014 5:32:20 PM EST
Yep. Clean, properly oiled, and a solid condition air filter.
Link Posted: 10/1/2014 8:08:56 PM EST
I have also been adjusting the lifters and timing chain tensioners to get rid of a motor rattle, but that hasn't worked either.

It may very well be time to pull the jug and possibly split the case in order to get this thing running like a sewing machine.

And in retrospect... a four stroke doesn't have oil in the fuel, so I have come to the realization that this is a jetting issue.
Link Posted: 10/1/2014 8:13:42 PM EST
Link Posted: 10/1/2014 8:14:44 PM EST
[Last Edit: 10/1/2014 8:17:53 PM EST by ch1966]
Originally Posted By Flatulence:
Blue Smoke.
View Quote


Originally Posted By Flatulence:
I have come to the realization that this is a jetting issue.
View Quote



Blue smoke is indicative of oil being combusted.
Black smoke indicates a too rich condition.

i don't think it's a jetting problem as described.
Link Posted: 10/1/2014 8:24:27 PM EST
I'd be amazed if you could jet an XR100 so rich it smokes, but still runs.
jetting just doesn't change on its own.
Is the plug black and wet?

Could be the seals and guides on the exhaust valve leaking oil into the hottest part of the engine.
Link Posted: 10/1/2014 8:28:36 PM EST
Avatar is fitting.
Link Posted: 10/1/2014 8:32:34 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Phineas7:
I'd be amazed if you could jet an XR100 so rich it smokes, but still runs.
jetting just doesn't change on its own.
Is the plug black and wet?

Could be the seals and guides on the exhaust valve leaking oil into the hottest part of the engine.
View Quote



Bad rings? Scored cylinder?
Link Posted: 10/1/2014 9:31:45 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By akethan:
Avatar is fitting.
View Quote

Ya' think Cap'n Obvious ?

Who do you suppose made it my avatar ?!?!?!

Bwaaahahahahahahahahaaaaaa !!!!!!!!!!
Link Posted: 10/1/2014 9:40:57 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Phineas7:
I'd be amazed if you could jet an XR100 so rich it smokes, but still runs.
jetting just doesn't change on its own.
Is the plug black and wet?

Could be the seals and guides on the exhaust valve leaking oil into the hottest part of the engine.
View Quote

Yes, the plug is as you describe.

There is also a rattle in the engine that I can't get rid of with timing chain tensioner adjustments.

See my above post which agrees with your assessment of jetting NOT being part of the problem.
Link Posted: 10/2/2014 7:23:41 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ch1966:





Blue smoke is indicative of oil being combusted.
Black smoke indicates a too rich condition.

i don't think it's a jetting problem as described.
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Originally Posted By ch1966:
Originally Posted By Flatulence:
Blue Smoke.


Originally Posted By Flatulence:
I have come to the realization that this is a jetting issue.



Blue smoke is indicative of oil being combusted.
Black smoke indicates a too rich condition.

i don't think it's a jetting problem as described.

I just now realized I omitted the word NOT in my above sentence...

I wanted it to read:

"I have come to the realization that this is not a jetting issue."
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