have been looking for the waterpump mechanical seal formy crm . e bay prices very from cheap to holy poo prices but the sellers in japan lol . noticed someone selling a seal for £26 but in the description it says this seal fits the crf 450x as well . so is the crm 250 mechanical seal the same as the one fitted to the crf ??

What is the Honda part number for the one that fits the CRF?

there is no part number bud . just a picture . listings on e bay . https://www.ebay.co.uk/itm/Water-Pump-O ... 0675.m4236

Well ask the seller for the part number .............

CRF one fits a lot of bikes. No mention of CRM in list though.
https://www.bike-parts-honda.com/microf ... L-300.html

CRM one fits loads of bikes too but not a CRF in the list.
https://www.bike-parts-honda.com/microf ... 7-023.html

Hmm. Maybe a slight difference that doesn't effect the working but you would have to buy it to see. I suppose if you buy it on the understanding that it fits a CRM and they say it does you can return it if it doesn't.

thats sort of what i was thinking . might give it a try out and see if its any good