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I have a 1970 CB175, I need the seal that goes behind front sprocket? Can it be removed without splitting the case?
Help! What’s the part number, I’ve found so many different numbers?
 

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Some guys on here have had luck replacing it without splitting the cases, though I don’t think it was a 175 (I think Rob Axel might be the last person I remember succeeding with it). Best way to get a part number is to go to the CMSNL fiche for your year and use whatever they say. If more than one, check your VIN against the ranges they provide. If no VIN range, any of them will fit.
 

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If you can get to it you might try running a screw in to it and try to pry it out. Never tried it on a bike but did a lot of it on pumps and gear drives while working as a millwright.

Bill
 

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There's no need to split the cases on a 175 to replace the countershaft seal (the one behind the front sprocket). I looked for the seal yesterday, found it is discontinued and didn't find anyone selling it in a quick search (Western Honda, DSS, 4into1, Partzilla), but here are a couple eBay sellers that seem to be legit NOS

https://www.ebay.com/itm/Honda-NOS-OEM-CA160-CA175-CB160-CB175-Oil-Seal-20x52x9-91201-216-000/113147749013?hash=item1a5821a295:g:wJcAAOSwNaNbSI4O

https://www.ebay.com/itm/Honda-NOS-CA160-CA175-CB160-CB175-Oil-Seal-20x52x9-91201-216-005-o-/391863782716

here's the listing at cmsnl.com

https://images.cmsnl.com/img/partslists/honda-cb175k4-super-sport-1970-usa-transmission_bigma000158e14_434a.gif
 

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This is the screw removal process. Drill a small hole in the middle of the seal 1/2 way between the case and shaft. Run a screw in 1-2 turns, temptation will be to keep going but there's a bearing directly behind it that will get damaged if you do. Use a pry bar like a nail removal tool to pry out using the head of the screw, you might need a washer on the screw.
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