LOWER CASES ALL THE SAME OR?

General forum on engines, transmissions, gearing and modifications to each

Moderator: rztom

Post Reply
Message
Author
TN-592
Posts: 55
Joined: Mon Jan 11, 2016 6:48 am

LOWER CASES ALL THE SAME OR?

#1 Post by TN-592 » Wed Sep 13, 2017 8:01 am

I was trying to trenched rd350 31k cases for the 10 mil setup,forgot to change the tool setting in the cnc machine so now i have a hole in the cases.
Was trying to buy another lower unit on ebay but there i can just find cases from year 74 and so.....on
My question is are all lower cases the same,which can i fit on the 31k transmision and upper unit case?

Hooligan
Posts: 1966
Joined: Mon Aug 20, 2012 1:37 am
Location: Calgary, Alberta

Re: LOWER CASES ALL THE SAME OR?

#2 Post by Hooligan » Wed Sep 13, 2017 4:22 pm

Is the new hole in a bad place? Just tap it and thread in a plug would seem to be the easiest and cheapest fix.
'82 RD350LC in '81 colours, OEM pipes, UNI filters
'85 FZ750

User avatar
T.RexRacing
Posts: 1318
Joined: Fri Nov 01, 2013 8:34 pm
Location: back in the hills

Re: LOWER CASES ALL THE SAME OR?

#3 Post by T.RexRacing » Wed Sep 13, 2017 9:20 pm

The crank bearing bores are line bored. Not a good idea mixing cases.
There is only one difference between a madman and me. The madman thinks he is sane. I know I am mad.
Salvador Dali

User avatar
JonW
Posts: 10599
Joined: Sat Oct 10, 2009 4:33 am
Location: Sydney
Contact:

Re: LOWER CASES ALL THE SAME OR?

#4 Post by JonW » Wed Sep 13, 2017 9:57 pm

you need a matched set of cases as Trex says, they are numbered for that reason on the stator side.

Weld up the hole, easy...
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid

Like Watches? www.PloProf.com & www.DeskDivers.com

User avatar
Zedixe13
-----
-----
Posts: 688
Joined: Wed Jan 16, 2008 1:39 am
Location: Quebec city Canada

Re: LOWER CASES ALL THE SAME OR?

#5 Post by Zedixe13 » Thu Sep 14, 2017 6:32 pm

I have an undamaged 1983 case if you need one .

TN-592
Posts: 55
Joined: Mon Jan 11, 2016 6:48 am

Re: LOWER CASES ALL THE SAME OR?

#6 Post by TN-592 » Sat Sep 16, 2017 5:06 pm

Thank you all for your replys
Since it is not so smart to mix cases first i will try to weld or epoxy the hole

Post Reply