Read my plug-2 stroke newbie

opyguy
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opyguy
Edited Date/Time 5/19/2017 8:16am




All input appreciated thanks!

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rmoto003
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rmoto003 5/18/2017 2:50pm
5/18/2017 2:50pm
All I can make out are the letters "B" and "J".

Try getting a better pic of the letters
Paw Paw 271
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Paw Paw 271 5/18/2017 3:50pm
5/18/2017 3:50pm
Oily and or too rich.
Can be caused by attempting to run a 50:1 mix or possibly a leaking crank seal or very low compression. More info needed to be sure.

Paw Paw
Knoby
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Knoby 5/18/2017 4:02pm
5/18/2017 4:02pm
Yeah it's way too rich. Try adding some body lotion or hair conditioner
opyguy
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opyguy 5/18/2017 4:18pm
5/18/2017 4:18pm
Paw Paw 271 wrote:
Oily and or too rich. Can be caused by attempting to run a 50:1 mix or possibly a leaking crank seal or very low compression. More...
Oily and or too rich.
Can be caused by attempting to run a 50:1 mix or possibly a leaking crank seal or very low compression. More info needed to be sure.

Paw Paw
Brand-new 250 SX and running 60 to 1 stock jetting air screw 2 1/2 turns out
Sea level in the Northeast

The Shop

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smoothies862
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smoothies862 5/18/2017 4:36pm
5/18/2017 4:36pm
rmoto003 wrote:
All I can make out are the letters "B" and "J".

Try getting a better pic of the letters
fastball right down broadwayTongue
kzizok
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kzizok 5/18/2017 5:25pm
5/18/2017 5:25pm
Knoby wrote:
Yeah it's way too rich. Try adding some body lotion or hair conditioner
Gold!
project racer 5/18/2017 6:27pm
5/18/2017 6:27pm Edited Date/Time 5/18/2017 6:33pm
Accurate plug readings have to be taken after a full throttle run , preferably in the top two gears, followed by pulling in the clutch and hitting the kill button without reducing the engine speed.

Commonly called a plug chop.

The tip and upper areas of the porcelain surrounding the electrode are not the area for the true reading to be taken from.

Without a special scope to peer down to the base of the electrode insulator, the only way to truly read a plug is to carefully cut the threaded portion of the plug off, and observe the coloring "ring" made at the base of the insulator.

The plug "colors" from the base up.

If you are running pump gas, plugs do not "color" like they used to before everything went unleaded. A true reading may take many full throttle passes to achieve using a new plug.

Idling around makes trying to obtain an accurate reading pointless.

And for what it's worth, jetting requirements can change more often than you change under wear,depending on conditions.
Rocket164
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Rocket164 5/18/2017 7:23pm
5/18/2017 7:23pm
project racer wrote:
Accurate plug readings have to be taken after a full throttle run , preferably in the top two gears, followed by pulling in the clutch and...
Accurate plug readings have to be taken after a full throttle run , preferably in the top two gears, followed by pulling in the clutch and hitting the kill button without reducing the engine speed.

Commonly called a plug chop.

The tip and upper areas of the porcelain surrounding the electrode are not the area for the true reading to be taken from.

Without a special scope to peer down to the base of the electrode insulator, the only way to truly read a plug is to carefully cut the threaded portion of the plug off, and observe the coloring "ring" made at the base of the insulator.

The plug "colors" from the base up.

If you are running pump gas, plugs do not "color" like they used to before everything went unleaded. A true reading may take many full throttle passes to achieve using a new plug.

Idling around makes trying to obtain an accurate reading pointless.

And for what it's worth, jetting requirements can change more often than you change under wear,depending on conditions.
Spot on. Here is an example...

Paw Paw 271
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Paw Paw 271 5/18/2017 8:46pm
5/18/2017 8:46pm
60:1 makes the fuel mix too rich. Either go down on the ration to 40:1 or so and see if the plug looks better.
The only other recourse is to rejet your carb to obtain a leaner fuel mix.

Paw Paw
sandman768
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sandman768 5/19/2017 8:12am
5/19/2017 8:12am
Assuming you are just looking for some decent / safe jetting. What is your skill level? What type of terrain are you riding? Are you racing or trail riding? Are you currently fowling plugs? What gas are you running? These are all factors in your jetting....Ktm"s can be a little tedious to jet, especially the new Mikuni...have you read through MXA"S suggestions? They can usually get you close, although on the east coast we tend to need richer jetting than out west.
sandman768
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sandman768 5/19/2017 8:16am
5/19/2017 8:16am
Paw Paw 271 wrote:
60:1 makes the fuel mix too rich. Either go down on the ration to 40:1 or so and see if the plug looks better. The only...
60:1 makes the fuel mix too rich. Either go down on the ration to 40:1 or so and see if the plug looks better.
The only other recourse is to rejet your carb to obtain a leaner fuel mix.

Paw Paw
I agree 100%!PawPaw, I have used 32-40:1 forever, never an issue. The new KTM"s use a Mikuni now, MXA stated the bike carborated better at 60:1 as per KTM"S manual suggest....I still use 40:1 in my 2 strokes....
Dirtdemon 5/19/2017 9:04am
5/19/2017 9:04am

More oil means better piston ring seal.
buy 10 new sparkplug and do as project racer.
don´t lessen oil to get "better " plug read... lessen fuel instead

opyguy
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opyguy 5/19/2017 9:41am
5/19/2017 9:41am
sandman768 wrote:
Assuming you are just looking for some decent / safe jetting. What is your skill level? What type of terrain are you riding? Are you racing...
Assuming you are just looking for some decent / safe jetting. What is your skill level? What type of terrain are you riding? Are you racing or trail riding? Are you currently fowling plugs? What gas are you running? These are all factors in your jetting....Ktm"s can be a little tedious to jet, especially the new Mikuni...have you read through MXA"S suggestions? They can usually get you close, although on the east coast we tend to need richer jetting than out west.
vet c (50 years old) figure 2:48's @ Southwick
ride southwick, wareham and crowhill.
Actually using MXA's settings, just always trying to get a little better. Bike has a small low end blubber (not noticeable on track 1/8-1/4 throttle), also a low end "Knock" @ very low RPM. Again, no real issues w/bike, just trying to dial it in (has 3 hours on it)...thanks for all the input....BJ
305FC250
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305FC250 5/19/2017 2:50pm
5/19/2017 2:50pm
A lot of newer 2 strokes are calling for ratios in the 60:1 area when using lower octane fuel. The old standard of 32:1 or similar doesn't really apply to the new stuff. Instead of telling him to change his ratio I think he should just jet properly for the manufacturers specified ratio, as I'd imagine they have a reason for it.
Paw Paw 271
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Paw Paw 271 5/21/2017 10:40am
5/21/2017 10:40am
Lubrication standards still apply to 2 stroke engines. It is better to protect the engine with additional oil than to have excess fuel to wash the oil away with. Fuel is not a good lubricant.

Paw Paw
seth505
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seth505 5/23/2017 1:18pm
5/23/2017 1:18pm
I had messaged you with some info but I'm running 40:1 in my 2017. Also, if you aren't wide open all the time, the stock pilot is pretty rich.

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