Right now i am using NGK BR8ES plugs on my indy lite, I was wondering if i could put a better plug in for better starting and longer lasting. I was looking in royal distributing and they had some NGK iridium ix which is a BR8EIX i was told it would work but i would like more opinions. I was also looking at the Bosch super copper core resistor BR8ES, and the bosch silver center electrode no resistor B8ES i thought it might work also.
Sometimes price is better but im not sure (Canadian)
-ngk br8es 2.99
-ngk iridium ix br8eix9.95
-bosch super copper core resistor br8es 3.99
-bosch silver center electrode no resistor b8es 11.95
Please help if you can
Shaine
Full Version: spark plugs
Shaine,
The Iridium plugs are less prone to fouling but very expensive. Judging by the year of your sled (1992) she probably has a few miles on it if the engine has not been overhauled. An engine with several thousand miles will have reduced compression and be more prone to plug fouling. These 340's had pretty low compression to begin with, so they are more apt to have "too" low of compression later in life. I suggest stepping up one heat range over stock to a BR9ES.
I did the same in our 250cc Starlite and it runs/starts great. This plug will run slightly hotter and as result resist fouling much better in a higher mileage engine, while posing no threat of engine damage. Even if the engine is fresh with high compression you should not have a problem with one heat range hotter plug.
The Iridium plugs are less prone to fouling but very expensive. Judging by the year of your sled (1992) she probably has a few miles on it if the engine has not been overhauled. An engine with several thousand miles will have reduced compression and be more prone to plug fouling. These 340's had pretty low compression to begin with, so they are more apt to have "too" low of compression later in life. I suggest stepping up one heat range over stock to a BR9ES.
I did the same in our 250cc Starlite and it runs/starts great. This plug will run slightly hotter and as result resist fouling much better in a higher mileage engine, while posing no threat of engine damage. Even if the engine is fresh with high compression you should not have a problem with one heat range hotter plug.
QUOTE(polcat @ Nov 9 2007, 02:54 PM) 
Shaine,
The Iridium plugs are less prone to fouling but very expensive. Judging by the year of your sled (1992) she probably has a few miles on it if the engine has not been overhauled. An engine with several thousand miles will have reduced compression and be more prone to plug fouling. These 340's had pretty low compression to begin with, so they are more apt to have "too" low of compression later in life. I suggest stepping up one heat range over stock to a BR9ES.
I did the same in our 250cc Starlite and it runs/starts great. This plug will run slightly hotter and as result resist fouling much better in a higher mileage engine, while posing no threat of engine damage. Even if the engine is fresh with high compression you should not have a problem with one heat range hotter plug.
The Iridium plugs are less prone to fouling but very expensive. Judging by the year of your sled (1992) she probably has a few miles on it if the engine has not been overhauled. An engine with several thousand miles will have reduced compression and be more prone to plug fouling. These 340's had pretty low compression to begin with, so they are more apt to have "too" low of compression later in life. I suggest stepping up one heat range over stock to a BR9ES.
I did the same in our 250cc Starlite and it runs/starts great. This plug will run slightly hotter and as result resist fouling much better in a higher mileage engine, while posing no threat of engine damage. Even if the engine is fresh with high compression you should not have a problem with one heat range hotter plug.
A BR9ES Is colder than a BR8ES. The NGK Heat range chart runs the other way (9 is coldest, 1 is hotttest). A hotter plug would then be a BR7ES
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.