Hello everybody,

I am David, 31, from Germany and I started my Yamaha vintage 2 stroke path in 2018 with a '72 R5F, then completely rebuilt a RD350LC, then got a DT175MX and got it road- and dirt worthy again and now I got something really interesting to me:
I pulled out a MX175A from 1974 out of an importer's garage yesterday. All in all in a very good condition, seems to be really original and complete.
I bought it to have fun with it on classic moto cross events (and because it's absolutely beautiful and rare and I just HAD to buy it)

However, the engine is stuck and the reason is a broken crankshaft, connecting rod has seized. Looking for spare seems to be difficult, does anybody know if there are cranks from other Yamaha models that eventually fit? Or do I have to buy an after market connecting rod and let somebody press it in my broken crank? Of course I would like a new complete crankshaft  

Researching for specs and information seems to be a little bit difficult as well, so I wanted to ask if anybody knows where I can find some basic information and specs around this model. I already found something at cmsnl and ordered a service manual for this specific model year, but I feel like you can never get enough information. It also seems like these bikes were much more popular in the US than in Europe, as my bike for example was imported from California.

Really appreciate any help and hints!

I would like to share some pictures as well by the way, how can I post them in here?



 

 from near Salisbury, UK.

Just in case you didn't already know, if you select a part on CMSNL, then scroll down a little, you will see which other models used that part. You can do a similar thing on Partzilla, but there you need to look on "Product Fitment" after selecting a part.

To accurately identify your model, look up the VIN/engine number (they will have been the same originally) in the VIN table on this forum - see "Tech Library" on the top toolbar. There might also be some manuals in the Tech Library.

Regarding uploading photos, we need to use a third party host such as Imgur and, as a security measure, you need to have made about twelve posts before you can upload.

I'm sure you will, but replace the front and rear brake shoes!

New rod, pin, bearings, washers are available new from Yamaha still.  

Pretty common to rebuild the crank.   Several Yamaha models used that crank, probably won't be easy to find a complete new assembly and a used assembly probably should be rebuilt with a new rod, so might as well do yours.  

I've heard PJME in the UK does good work and not too far away from you.