KLE plugs
Hello Staal.
The heat range for the plugs are different for the 400 and 500. The 400 uses a slightly hotter plug, to combust properly. I went through the same issues, and found that the bike does perform better with the proper plugs.
Can you perhaps give us the details of the exhaust and carb upgrades you did, as well as the fuel consumption difference afterwards.
Just make sure that you tighten the plugs properly when you change them. The bike's plug spanner sometimes sticks against the top, making you think the plug is tight.
Regards
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