Exhaust question an d a few minor things~

[Dmajiq]

So first i want to say thanks to everyone for helping me out. I just started riding again after 4 months of heavy workload at my job and trying to do work on the bike (clean the carbs). In the end i took it to a shop.

I wasn't strong enuff to do what the bikecliff website said to do and i didn't have to the time to figure it out. these guys were great that did it and since i had all the parts it wasn't very expensive.

One thing they told me though for Mikuni carbs is not to disband them from the gang plank. Suzuki puts a seal connecting the carbs together, so when taken apart the seal is broken and it leaks constantly. If other's agree with this info perhaps spread it along so others don't make the that mistake. In all the research i've done it's never mentioned.

My exhaust question is this:

I see smoke coming out of the exhaust and I think it's blue, that means unburned fuel correct?

I also keep smelling gas. My carbs are clean. The intake boots are new with Viton O-rings. i don't have a leak coming from the carbs at all, but this is very similar to the problem i was having originally when i began trying to fix everything. I also have a new petcock installed.

I've been riding now since last saturday. tonight the engine seemed to drag a little, like there was a struggle for power. not a big struggle though b'cuz the engine still hummed pretty smooth. I haven't done a carb sync yet since the cleaning so i was going to get on that this weekend.

Will that fix the blue smoke, poor gas mileage and intermittent lack of power?

 

[tkent02]

One thing they told me though for Mikuni carbs is not to disband them from the gang plank. Suzuki puts a seal connecting the carbs together, so when taken apart the seal is broken and it leaks constantly.

BS. They can't be cleaned properly without thing them apart.
They lie, don't go back to them.

 

[cowboyup3371]

Tkent is right. The seals they refer to are only orings that will dry up after so long and must be replaced anyway.

 

[Dmajiq]

Hmmm, the seals they were referring too were in-between the carb bowls. there's o-rings there?

 

[GateKeeper]

Blue smoke usually means your burning oil, perhaps a bad ring on a piston ?

 

[cowboyup3371]

Huh? The only seal between each carb is the fuel nipple (for lack of a better word right now) with orings on it. Plus each bowl has a gasket with orings on a couple of other pieces.

Another reason to do the work yourself only - you'll know what you have.

Go get Nessism's carb rebuild tutorial from Basscliff's site and read through it. You'll be surprised by how easy it is.

 

[Dmajiq]

Thank you gate keeper~

 

[GateKeeper]

I am not an expert, but typically this is the cause for blue smoke, seen it many times on cars.

put a rag close to the exhaust as the bike is running, leave there for a bit, then smell the rag, does it smell of oil or gas, used to do that with cars to determine if the rings were shot

 

[Dmajiq]

yeah, i'm really not strong enuff to do it myself, lol. that was the problem. broke my collar bone so it's hard to use my shoulder to muscle through things. i know bout the nipples and the o-rings. I read over 3 different pdf's on how to take the carbs apart, clean and put them back together and at least 5 youtube videos, lol. that's why i said in my research it's never mentioned these seals the mechanic was talking about. i'll ask him about it again later.

More concerned about the gas smell and poor mileage. The smoke just started up again tonight since riding again last saturday. Concerned i may have to do a complete overhaul on the engine. Not looking forward to the epense~

 

[Dmajiq]

excellent idea! Thank you gatekeeper!

 

[Dmajiq]

Is this accurate?





4-Stroke Bike Engine Condition through Exhaust Smoke

May 13th, 2009 Goto comments Leave a comment

#1. Colourless or slightly blue smoke from exhaust
This means that your bike is very good condition. What you can assume is your fuel/air mixture is at the right composition and everything is well burnt is your combustion chamber.
#2. Yellow or brownish smoke from exhaust
Your fuel/air mixture is too lean. Too lean means that there is low fuel but high air mixture in your combustion chamber.
Solution: Adjust the fuel/air mixture at your carburetor (or ECU) accordingly.
#3. Black smoke from exhaust
Your fuel/air mixture is too rich. High fuel but low air intake. This will reduce your fuel efficiency since the black smoke is your unburnt fuel.
The problem might be at this part:
i. Your air filter is dirty or blocked from receiving air from surrounding.
ii.Your choke is closed
iii. Your carburetor is damaged
Solution:
i.Clean/replace air filter
ii.Open choke
iii.Repair/replace your carburetor.
#4. White smoke from exhaust
This happen when your engine oil gets into the combustion chamber.
The problem might be at this part:
i. Piston ring is loose
ii. Piston is worn out
iii. Engine block is worn out/scratched
iv. Valve is worn out/damaged
v. Valve line is worn out/scratched
Solution:
i. Replace piston ring
ii. Rebore block and replace piston
iii. same with no. ii
iv. Replace valve
v. Rebore valve line and replace valve.
Sometimes white smoke can also occur in the morning or you start your bike after it is being left on the rain. The white smoke is the water vapour released from the condensation that happens inside your exhaust. Normally, this happens only for few minutes and then it will be back to colourless again. The difference from white water vapour smoke and white exhaust smoke is the smell. What I can say is, the smell from engine oil being burnt is your combustion chamber is bad and very busuk. Water vapour doesn?t have any smell.


http://xbfish.com/2009/05/13/4-stroke-bike-engine-condition-through-exhaust-smoke/

 

[DanTheMan]

Is this accurate?





4-Stroke Bike Engine Condition through Exhaust Smoke

May 13th, 2009 Goto comments Leave a comment

#1. Colourless or slightly blue smoke from exhaust
This means that your bike is very good condition. What you can assume is your fuel/air mixture is at the right composition and everything is well burnt is your combustion chamber.
#2. Yellow or brownish smoke from exhaust
Your fuel/air mixture is too lean. Too lean means that there is low fuel but high air mixture in your combustion chamber.
Solution: Adjust the fuel/air mixture at your carburetor (or ECU) accordingly.
#3. Black smoke from exhaust
Your fuel/air mixture is too rich. High fuel but low air intake. This will reduce your fuel efficiency since the black smoke is your unburnt fuel.
The problem might be at this part:
i. Your air filter is dirty or blocked from receiving air from surrounding.
ii.Your choke is closed
iii. Your carburetor is damaged
Solution:
i.Clean/replace air filter
ii.Open choke
iii.Repair/replace your carburetor.
#4. White smoke from exhaust
This happen when your engine oil gets into the combustion chamber.
The problem might be at this part:
i. Piston ring is loose
ii. Piston is worn out
iii. Engine block is worn out/scratched
iv. Valve is worn out/damaged
v. Valve line is worn out/scratched
Solution:
i. Replace piston ring
ii. Rebore block and replace piston
iii. same with no. ii
iv. Replace valve
v. Rebore valve line and replace valve.
Sometimes white smoke can also occur in the morning or you start your bike after it is being left on the rain. The white smoke is the water vapour released from the condensation that happens inside your exhaust. Normally, this happens only for few minutes and then it will be back to colourless again. The difference from white water vapour smoke and white exhaust smoke is the smell. What I can say is, the smell from engine oil being burnt is your combustion chamber is bad and very busuk. Water vapour doesn?t have any smell.


http://xbfish.com/2009/05/13/4-stroke-bike-engine-condition-through-exhaust-smoke/

White smoke is a lean condition. Blue smoke is oil being burnt. You can smell the oil being burnt if you're burning a lot of it. The exhaust has an oily smell and also will usually leave an oily residue on the outlet of the exhaust pipes.