TOPIC:

I am planning on getting a set of BP5ES plugs for my bike as it seems to be fouling the plugs quite easily i realise it could well be a carb issue but as i have previously stated i am a bit of a numpty when it comes to carbs so i am trying the easy fix first, my question is do i need the bpr5es which i understand has a resister in or are standard bp5es okay

My understanding that the resister in the plugs is only for radio noise suppression. And does not effect the performance of the plug

If you have spark plug caps with built in resistor (most of them have 5 kilo ohm resistor) then using R plugs is not necessary. Double resistos reduce spark efficiency.

as always gents thanks for your input

I did a sort of comparison test on my bike when I replaced the NGK BP6ES conventional plugs with Denso IW20 5306 Iridium. I paid $34.41 for six, including $6.99 shipping, from RockAuto.

"0.4mm Iridium tipped laser welded fine wire center electrode reduces required voltage and improves firing performance.
Tapered cut U-Groove ground electrode increases ignitability and decreases quenching"

www.densoproducts.com/product.aspx?zpid=11175

1) The plugs in the engine were over ten years old, but showed no signs of wear. I cleaned them with carb cleaner, then heated them with a propane torch until they glowed to burn off any residue.

2) The Denso IW20 part #5306 plugs had the large connector, but the tip can be screwed off to reveal the threaded connector that these bikes require. HOWEVER, since these plugs are also used in automotive applications, some manufacturer cross-over tables list as equivalent to the BP5ES, plugs with the large connector that DON'T screw off. Be sure to check the details if you decide to use a different brand.

3) After the switch, the bike started up much more quickly than before.

If you ever choose NGK Plugs for our 1300, then NEVER order any with the "11" digit at the end (i.e BPR6ES-11), as this means they have FIXED connection caps on the top.......not the SCREW TYPE which we need and to remove for fitment into the plug cap !

Pete F
UK