Post by Jet⚡Black on May 26, 2012 22:03:19 GMT -6
I was researching into buying some plugs; NGK's and used their search recommendation for our bikes...and ran across a little tidbit that might help people iron out some problems, that usually get blamed on the carburetor and the radiator.
Have any of these problems? Erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion. You might be surprised to find out that it might not be your carburetor after all; how about almost running hot at stop lights the radiator? How about it being your plugs. Yes, you read that right...plugs.
NGK recommends the following plugs for the following years.
1985-86: D9EA gap: 0.028
1987: DR8EA gap: 0.028
1988-90: D9EA gap: 0.028
So what is so special about 1987, and why does it have a different plug designation than the others?
Ok plug code time...
D= 12mm / 5/8" 18mm.
R= Resistor construction.
8/9= Heat rating the numbers from 1-12; 1 hottest, 12 coldest.
E= 19mm (3/4") Thread reach
A= Special design; taper length before the threads start.
So what is the difference between a hot and cold plug? A hot plug(lower number for NGK) is ideal for city stop and go traffic; it holds it's heat longer instead of sending it into the head, which keeps your bike running cooler.
What about colder or higher numbered NGK plugs? A colder plug is mostly used in racing applications, They are very good at transferring temperature out of the combustion chamber quickly into the head. They minimize the risk of pre-ignition and detonation, however if the plug is too cold there is risk of fouling during extended periods of idling and low-speed operation.
Ok fine and dandy...what's the deal with the R or resistor construction business? The NGK "R" or resistor spark plugs use a 5k ohm ceramic resistor in the spark plug to suppress ignition noise generated during sparking.
NGK strongly recommends using resistor spark plugs in any vehicle that uses on-board computer systems to monitor or control engine performance. This is because resistor spark plugs reduce electromagnetic interference with on-board electronics.
They are also recommended on any vehicle that has other on-board electronic systems such as engine-management computers, two-way radios, GPS systems, or whenever recommended by the manufacturer.
In fact, using a non-resistor plug in certain applications can actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion.
So there you have it; NGK plugs recommended for the EN450/454ltd decoded, and some slack given to your hair pulling carburetor, that can't seem to get ironed out...and your like it on the hot side radiator.
The next time you have any of the issues mentioned...don't forget; check your plugs
Have any of these problems? Erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion. You might be surprised to find out that it might not be your carburetor after all; how about almost running hot at stop lights the radiator? How about it being your plugs. Yes, you read that right...plugs.
NGK recommends the following plugs for the following years.
1985-86: D9EA gap: 0.028
1987: DR8EA gap: 0.028
1988-90: D9EA gap: 0.028
So what is so special about 1987, and why does it have a different plug designation than the others?
Ok plug code time...
D= 12mm / 5/8" 18mm.
R= Resistor construction.
8/9= Heat rating the numbers from 1-12; 1 hottest, 12 coldest.
E= 19mm (3/4") Thread reach
A= Special design; taper length before the threads start.
So what is the difference between a hot and cold plug? A hot plug(lower number for NGK) is ideal for city stop and go traffic; it holds it's heat longer instead of sending it into the head, which keeps your bike running cooler.
What about colder or higher numbered NGK plugs? A colder plug is mostly used in racing applications, They are very good at transferring temperature out of the combustion chamber quickly into the head. They minimize the risk of pre-ignition and detonation, however if the plug is too cold there is risk of fouling during extended periods of idling and low-speed operation.
Ok fine and dandy...what's the deal with the R or resistor construction business? The NGK "R" or resistor spark plugs use a 5k ohm ceramic resistor in the spark plug to suppress ignition noise generated during sparking.
NGK strongly recommends using resistor spark plugs in any vehicle that uses on-board computer systems to monitor or control engine performance. This is because resistor spark plugs reduce electromagnetic interference with on-board electronics.
They are also recommended on any vehicle that has other on-board electronic systems such as engine-management computers, two-way radios, GPS systems, or whenever recommended by the manufacturer.
In fact, using a non-resistor plug in certain applications can actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion.
So there you have it; NGK plugs recommended for the EN450/454ltd decoded, and some slack given to your hair pulling carburetor, that can't seem to get ironed out...and your like it on the hot side radiator.
The next time you have any of the issues mentioned...don't forget; check your plugs
