spark

Hi everybody, I've encountered an issue recently that I've been trying to figure out for a while and I'm running out of ideas. I completed my first service on my 2018 RC390 about a week or so ago. Measured the valve clearances (3 out of spec: both intake, one exhaust), shimmed em to spec...

Bought a used rc390 with an unknown history. All signs point to a gentle life before my ownership but it's not known if the previous owner maintained it. So far I have changed the oil and replaced the filter & screens, flushed and replaced the coolant, cleaned/lubed and adjusted the chain...

Has your spark plug boot ever fallen off during a race? Lord knows that ours has! How about have you ever pulled the spark plug out and seen that the boot has been rattling around on the plug leaving a sooty residue? Ours has! After enough rummaging around in our OEM catalog we have found that...

Hello everyone. I'm looking for higer performance spark plug. Could anyone give me advice? Thanks. Has anyone tried Bosch ZR5TPP33S? Can it fit on RC390? Personally, I prefer to use Bosch Spark Plug though it's hard to get in Taiwan. Hope someone could give me advice, thx.

Noob question: I'm looking to change my spark plug and could not see it with the ferrings off. Do i need to remove the tank?