Big Bore Information

Im looking for some advice on the big bore kits...

- Do I need to upgrade water pump + cooling?

- I saw a guy who had a SM CRF450 with a 'stroker' crank, I believe his displacement was around 520 cc... where can I find these?

- Athena or Cylinder Works? Are either pistons forged?

Your displacement is changing in your cylinder, your volume for coolant might increase or possibly decrease a bit also depending on coolant passages. Changing the water pump probably won't do anything, because in the end, if it's rated at 3.5GPM(est.) it is what it is.

Edited by CRF450XNUT

Go on the R forum and do a search. Lot's of SM big bore advice.

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