[68grandprix]

I'm trying to tear apart a spare 175 motor I have so I can get the third gear for a guy, but I'm having problems splitting the cases. I have the entire top end and both side covers off, and I've taken off all the bottom bolts. I've tried hammering and prying, but the cases won't budge. Are there some other fasteners I'm missing, or are there any good ways to get them apart? Thanks, Jimmy

 

[kenessex]

Now is the time to check for secret stuff. Does that have a bearing retainer behind the clutch that is screwed to both case halve? Or does the oil pump bolt to both case halves? Look for something that is either behind another part or hidden in some fashion. Or use a really big hammer. Maybe you can pound a really big cold chisel between the cases.(not really)

Ken

AHRMA 412
Vintage racing - old guys on old bikes

 

[68grandprix]

I did suspect there might be something behind the clutch basket. I tried taking it off, but I had trouble getting the "oil filter" off. The phillips stripped out, so I guess I'll have to drill the head off. The oil pump only bolts to the bottom case. Thanks, Jimmy

 

[Bret]

I'm not sure about the sloper CB/CL175, but if it's a vertical CB/CL175, remove the oil drain plug from the bottom of the motor. There is a case bolt hidden behind it. I've split a couple sets of vertical cases while building my racebike motor and it's the only hidden bolt I can think of.
If it's a sloper motor, ask Mr. Branson.

Cheers, Bret @ Glass from the Past

 

[imslow]

yup, that's the one. under the oil drain

 

[jbranson]

I still remember that bolt from when I first started working on those engines. As secret bolts go....that's a doozy.
JohnnyB

 

[68grandprix]

That's hilarious. As I was trying to figure out how to get the motor apart I just started taking off anything that would unbolt. The drain plug is rounded off, so I was trying to get if off with channel locks and my friend said, "why are you even taking that off?". So I said I didn't know, I just thought there had to be something else holding the cases together and he said "No, me and Plughaupt (floohop, a friend of ours) took an old Honda motor apart in highschool and it was a bitch to get the cases apart. You just have to pound on it here and pry here, blah blah blah". -I just went to the motor (it's on the kitchen table) and took the bolt out, lightly tapped the cases, and they split right apart. How do I figure out which gear is third gear? Thanks a lot, Jimmy.

 

[jbranson]

Third gear should be identified in the parts manual or service manual.

I hope you didn't screw up the mating surfaces of the cases by prying on them. If you did the common thing and tried to drive a screwdriver between the cases that is a good chance it will leak there if much damage was done.
JohnnyB

 

[68grandprix]

I don't have a parts manual. I didn't screw up the mating surface. I was pretty damn sure there was something else holding the cases together, so I only pried and hammered on ledges that were sticking out, and I was being pretty gentle. I'm not really planning on using this motor anyway. Anyone need parts. Jimmy