When do you have to re-plate the cylinder

[cr250-2000]

I am planning to replace the piston and rings and bearing on my 2000 CR 250. Do I need to have the cylinder re-plated as well if it is not scored? If not, do I replace the old piston with a standard bore replacement piston? Thanks

 

[Rhein]

I am planning to replace the piston and rings and bearing on my 2000 CR 250. Do I need to have the cylinder re-plated as well if it is not scored? If not, do I replace the old piston with a standard bore replacement piston? Thanks

Inspect your bore, if it has damage get it sent to lukes racing. If not you should be fine with a new piston and rings, standard bore.

Nikasil is ultra hard and really doesn't wear if the operator used proper premix ratios and etc.

 

[jrm]

You need to check the dimensions of the cylinder bore to make sure it's still within the factory tolerance. You'll need to know the cylinder's service limit and have a pair of calipers or a micrometer to do this. Or you can take to your dealer or mechanic.

Assuming it's within spec and has no scoring or flaking of the plating, put in a standard piston and ring (along with new bearing and wrist pin) and re-assemble. Make sure you know whether to use an "A" or a "B" piston on your Honda (the cylinder will have a mark A or B on it).

Good luck