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SMALL HAIRLINE CRACK. where clutch bearing clip rides in crankase?

gs11ezrydr

gs11ezrydr

Forum Mentor
I have seen this at the track with guys running helicut gear set up.A lot of junk cases sitting around.I had my gs1100ez exploaded a stock basket years ago.HV oil pump gear ring gear etc.Cases gouged also.I was shimming a new basket and just now noticed ths hairline crack is approx.1/4 -3/8 in.where the half moon clip, clips into the cases just on one side .Possible a more stressful area in the small thickness of the corners.....Where the bearing retained clip rides.Will it pull it out with the helicut gears.Small but concerning.I'm thinking about expoxy for now and check for and fractures in that area. I have seen cases destroyed where they attempt to WELD that sensitive thin ares..Has any one seen good strong repairs? Or after they total self destruct then recycle junk cases ? lolol
 
On my 1150/1229 Kat this piece has been broken for years. I tried once to jb weld it, failed.
There is that half moon shaped case plate, somewhat blocking the lower portion on the bearing.

Now, the last few times I've had the clutch basket off the narrow portion of that plate has been cracked off and laying in the sump.
The phillips head screw is still there holding the other side of plate along with other 2 screws on the plate.
To think Suzuki made such a thin strip holding the c-clip makes me wonder why the clip is even there.
Any side load at all would crack that 1/16'' aluminum holding the c-clip in.

I have 3 totally burned Wiseco pistons with only 400 miles on them, so the whole motor is split at the moment.
 
the crack/breakage is caused by basket heli gear side load.
straight cut gears eliminate the side load.
 
Not only just the side load that causes it to crack,Those heli cut gears are robbing H.P. also.It all like fighting itself,
 
isleoman said:
What's the plus side to helical? It looks more expensive to mfr but maybe not.
Click to expand...

Quieter and longer life. For a given gear width, the tooth is longer so more area in engagement equals lower point loadings.
There are drawbacks to straight cuts too. The force separating the shafts is higher with straight cuts. Generally that's not a problem but I've seen a couple of engines where installing straight cut primaries cracked the cases. Not Suzuki I'd add.
Roadrace applications don't see the sudden loadings you drag guys put in. Helicals will live even with big capacity and HP.

If you have to use helicals, one fix is to machine back the face outside the mainshaft bearing until you just hit the circlip groove.
Then make up a steel bearing retaining plate held in with 2 or 3 substantial screws.
 
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