- Location
- New York
So trying to get some advice on this. Feels rich, loads up down low but pulls hard up top.
Spark plug reading
- Thread starter Wetbuffalo
- Start date
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
Center porcelain is Black. Rich.
yes,but under what circumstances where the plugs pulled?
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
Nobody knows
- Location
- New York
So I pulled them after a plug chop. 3-4 second of full throttle. I don’t get why the strap is turning white. They are dry fouling.
- Location
- New York
Setup is a TPE 964, fullspec 46, 135 high 125 low, 26 psi pop. Tnt pipe. Running 90 non ethanol with to ratio right cups of 112 to 5 gallons. 42:1 R50 oil.
Quinc
Buy a Superjet
- Location
- California
check your pop off a few times and make sure a needle isn't sticking open.
- Location
- New York
What made me concerned is the strap turning white. What causes that? Pop of is perfect and has been checked.
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
3-4 seconds will not tell you anything. Took you longer to coast to a stop.
My 2 cents........... its very hard to make comment on plug readings from photographs?
That said, and an attempt to give you an answer.
I have built many TPE motors running Full Specs. The jetting you are stating is very typical.
The heat evidance on the ground electrode is very typical. It is an indication that you are actually very close.
Reading the porcelan is where you want to determine condition. Two strokes by nature create a lot of false positives
In plug readings? The oil residue masks what is actually going on in the combustion chamber.
While R50 is one of the premire oils we all use in our motors. It actualy has a high residue.
This does not mean its bad, it extremely good oil. Plug readings are effected by many factors, not just the carbs /
Fuel delivery. Compression, ignition timing, engine load, PV timing, exhause, grade of fuel ect all play a part.
To me, you are slightly rich?? ( Again, photos are hard to read) my guess in your bottom stumble is pop-off?
Specs normally run 1.8 n/s w/ 80g springs, #60 restrictor Try a 95g and a #70 restrictor?
I have found that cleans up the larger bore Full Specs.
Hope this helps
Ski ya, Paul
That said, and an attempt to give you an answer.
I have built many TPE motors running Full Specs. The jetting you are stating is very typical.
The heat evidance on the ground electrode is very typical. It is an indication that you are actually very close.
Reading the porcelan is where you want to determine condition. Two strokes by nature create a lot of false positives
In plug readings? The oil residue masks what is actually going on in the combustion chamber.
While R50 is one of the premire oils we all use in our motors. It actualy has a high residue.
This does not mean its bad, it extremely good oil. Plug readings are effected by many factors, not just the carbs /
Fuel delivery. Compression, ignition timing, engine load, PV timing, exhause, grade of fuel ect all play a part.
To me, you are slightly rich?? ( Again, photos are hard to read) my guess in your bottom stumble is pop-off?
Specs normally run 1.8 n/s w/ 80g springs, #60 restrictor Try a 95g and a #70 restrictor?
I have found that cleans up the larger bore Full Specs.
Hope this helps
Ski ya, Paul
- Location
- New York