Yam Ty175 / Dt Crankcases. + K/start Problem

[andy m]

Which year/model DT Yamaha 175 has the same crankcases as the TY. A friend is trying to locate some cases or bottom end,

also what is the gripe with the TY when the k/start returns too far and puts a hole in the clutch case? is it a return inside??

Seen it before but can't remember why it happens. Thanks in advance...

[feetupfun]

For external appearance, the closest crankcases are the DT175 A,B,C,D but the internals are different and so internal parts may or may not not be interchangable between motors eg crankshaft, gearbox, clutch. From E model on, the TY cylinder and flywheel cover wont fit.

Yes the kickstart return stop can slip on the kickstart shaft, allowing the shaft to return too far. This allows the head of the screw on the spline clamp on the kickstart knuckle to hit the casing, punching a hole.

[andy m]

Okay thanks, do you know if the TY 175 engine changed through its life?? I don't think it did but not 100%.

[andy.t]

If this is of any help the Haynes manual covers from 1974 to 1984 and I have never noticed any big changes mentioned, I think the only one that comes to mind was an improvement on the clutch push rod that changed from a one piece rod to a two part with a ball bearing. Could be wrong though.

[goudrons]

TY175 cases come up on ebay every now and then, there are a couple of sellers that break them regularly and don't want the earth for parts.

Unfortunately I just let a good matching pair go.

Careful of the case around the gearbox output shaft and where the selector fork arm fits from inside (black plastic cap near the sprocket), they tend to get smashed up when the chain comes off, the bad ones can have the cases split open around the output shaft.

As stated, the stopping lug on the inner end of the kickstart shaft is only pressed on and works lose, allowing the lot to over return and smash the outer case.