TZ350 and 250 Discussion Forum  

Go Back   TZ350 and 250 Discussion Forum > The tz350.com Discussion Forum > Yamaha TZ, TD, TR and TA Discussion
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
Thread Tools Display Modes
  #1  
Unread 01-07-2012, 09:06 AM
ross.crymble ross.crymble is offline
Warming up in pit lane
 
Join Date: Jan 2009
Location: Northern Ireland
Posts: 38
Default Oil way hole TZ v RD crankcases?

Hi guys, just got a recon set of R5/RD crankcases for my 350G. Centre main half clip grooves have been cut but the oil way below the selector barrel is drilled. Question is should I blank it off like stock TZ cases? I canít think of a reason why its not drilled in a TZ but is in RD cases.

Cheers
Ross
Reply With Quote
  #2  
Unread 01-07-2012, 11:00 AM
M.du Maine's Avatar
M.du Maine M.du Maine is offline
Won his first race on the new TZ!
 
Join Date: Jan 2007
Location: Assen - Netherlands - EC
Posts: 329
Default

Hi Ross

The Yam RD roadbike had a oil-bath clutch where it's wishfull to
get then and when some fresh oil in, and it was good for durability.
A TZ had a dry clutch and was a competition engine.
The oil in the primary drive was only for some gear lubrication, all the extra
was only drag + loss off power and extra heat to the cranc case.
I that way it's better to close that hole, also the one where the
kickstarter shaft went through the casing at the gearbox side.
Then most of the oil is 'pumped' to the gearbox.
The reason to put in that middle circlips you must tell me, except
you are using roller bearings on the outer cranc side.

Michel
__________________
MdM 63

Last edited by M.du Maine : 01-07-2012 at 11:04 AM.
Reply With Quote
  #3  
Unread 01-07-2012, 12:05 PM
ross.crymble ross.crymble is offline
Warming up in pit lane
 
Join Date: Jan 2009
Location: Northern Ireland
Posts: 38
Default

Thanks Michel
I hadn't thought of the drag on the primary gears, I have the kick start blank fitted but I will block off the oil passage as well. I think I will use silicone or rubber as I don't fancy a metal plug dropping out inside the gearbox

I am using roller main bearings on the outers.

Thanks again
Ross
Reply With Quote
  #4  
Unread 01-07-2012, 12:21 PM
M.du Maine's Avatar
M.du Maine M.du Maine is offline
Won his first race on the new TZ!
 
Join Date: Jan 2007
Location: Assen - Netherlands - EC
Posts: 329
Default

Yes Ross, you can put in anything, as there is no force on it.
I have put Epoxy in, but also some piece of left over rubber or silicone adterwards.
You also can cut off that 'kickstarter spring holder' from thre casing
and leave that metal plate on top of the clutch axle bearing if that was on.
Somehow that RD/TZ casings were 'over-engineered' and a lot off parts
are outdated or un-necessary.
It's actualy funny that a TZ engine with a straigt cut primary gear have four clips on the cranc, where a RD has only one, does that make sense ??


Michel
__________________
MdM 63
Reply With Quote
  #5  
Unread 01-08-2012, 08:59 AM
Bud Bud is offline
World Champion !!!!
 
Join Date: Jan 2007
Location: Sydney
Posts: 455
Default

I have been wondering why all the extra circlips in a TZ crankcase. Do you really need the extra circlips?

I am going to build an engine using RD cases, and I was unsure if I had to do the circlip mods.

At the Aussie Championships, my TZ350E crank was floating sideways by 3mm. We pulled it down, found it had the single circlip. So, not having any other option at the time, we loctited the bearings in a position which restricted the side movement.

The bike ran perfectly for the next 6 days of practice and racing at the Aussie and Tassie championships.
Reply With Quote
  #6  
Unread 01-08-2012, 09:38 AM
Twinshock750's Avatar
Twinshock750 Twinshock750 is offline
World Champion !!!!
 
Join Date: Feb 2007
Location: Auckland NZ
Posts: 1,145
Default

Bud

Were all 4 bearings moving in the cases? WE had one once where the crank was floating inside a main bearing as a press fit at the centre had moved a little! Kerry was doing 2-01's at PI with it all weekend!
__________________
Don't believe everything you think!
Reply With Quote
  #7  
Unread 01-08-2012, 06:57 PM
M.du Maine's Avatar
M.du Maine M.du Maine is offline
Won his first race on the new TZ!
 
Join Date: Jan 2007
Location: Assen - Netherlands - EC
Posts: 329
Default

......my TZ350E crank was floating sideways by 3mm........
How is that possible, as if you have the clip on the primary side, it's
allmost 'locked' in place.
That bearing is 'bolted' on the cranc.

Michel
__________________
MdM 63
Reply With Quote
  #8  
Unread 01-09-2012, 04:32 PM
Bud Bud is offline
World Champion !!!!
 
Join Date: Jan 2007
Location: Sydney
Posts: 455
Default

The bearing wasn't moving, but the crank was!
Reply With Quote
  #9  
Unread 07-08-2019, 06:10 PM
gintim's Avatar
gintim gintim is offline
Mid-pack and gaining
 
Join Date: Sep 2009
Location: Gosford Australia
Posts: 154
Default

Hi, what are people using to block the kick starter hole in the crank case?
Regards , Tim
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +11. The time now is 06:26 PM.


TZ350.com is © Greg Bennett

Powered by vBulletin® Version 3.6.7
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.