Distribution chain

The last few times i started the bike, bleu smoke came out the exhaust(ouch), untill the engine is warmed up.

My dealer advises me to change the piston rings (logic) and by the way to replace the distribution chain. Irhis really necessary ?

Has anyone already replaced the distribution chain ?

Thanks for your input.



'99 WR400 F, YZ exhaust, throttle stop trimmed, WR timing, airbox cover removed

I change this chain, because I begun to have the primary gear noise!. My bike have 12000ks (720mile soso). My old chain still could work more time, but I changed anyway.

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