[1986 radian 600]

Hi, thanks for the advice. I do not have any service records from the guy I bought it from. I will check to see for sure but I believe it knocks at anything under about 1300 rpms when cold. I will let you know if the adjustments you suggested work.

Thanks again

Rod

[1986 radian 600]

Hi Rod,

At what engine speed does your YX600 knock <1k or 3k ? With the choke on the bike is normally at fast idle ,3k or there abouts, and decreases when the choke is turned off. The correct idle speed, when warm is about 1.1k.

The oil light is level rather than pressure so if the bikes has pressure problems the light wont come on as long as there is enough oil in the engine, but one thing to take note of the light may come on under high engine speed & up hill (it will flicker a bit) this is normal.

Valve clearances on the YX do have a shorter service time than water cooled varients and tended to tighten up rather than loosen, good practice would be to check the clearances, adjust the cam chain, balance the carbs & adjust the mix screws, this will normally remove most knocks from the engine.

Regards Jim

[1986 radian 600]

Hey there, I'm new to this site so please forgive me if I screw up this posting. I have just purchased a 1986 radian with aprox 27,000 miles on it, it runs great and pulls hard but it has a knocking sound coming from the engine when at idle when cold. once it warms up and is at proper idle speed the knock goes away. You can aslo make the sound go away when cold if you give it just a little gas to bring the idle up. Does anybody have any ideas about the cause of this noise, I was thinking maybe timing chain slap or maybe low oil pressure, although the oil light does not come on? any help would be greatly appreciated.