Reply To: DR650 Exhaust Headache

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#14671

ss2fly
Participant
  • Location: Tauranga
  • Bike: KTM 540exc - modified
  • Rank: 250cc Rider

If I was just replacing the cam bearings, the cam sprocket retaining bolts can be removed allowing the sprocket to move enough to pull the cam out and the bearings can then be replaced. The chain doesn’t need to be split and removed for this.

To remove the sprocket, the chain needs to be split.

This can all be done with the engine still in the frame… only just!!

I replaced the chain anyway as it made sense. The end of the cam drives the water pump and usually develops groves where the seal rides so they need monitoring. I think its the silicates in the water or additive that does this….

I will be hard chroming the end of the cam should this happen and grinding back to spec which will stop it for good.