RZ/RD 350 & Misc. 2-Stroke Tech BBS

Technical Forums for Two-Stroke Nuts
It is currently Fri Sep 21, 2018 2:03 am

All times are UTC - 4 hours [ DST ]




Post new topic Reply to topic  [ 35 posts ]  Go to page Previous  1, 2, 3  Next
Author Message
PostPosted: Sun Jun 17, 2018 7:31 am 
Offline

Joined: Sun Sep 16, 2012 7:10 am
Posts: 226
Location: gold coast Australia
G'day. The lc suffered a soft seize due to a missing reed block gasket, the left cylinder had an air leek leading to seize during run in. Since the cylinders where allready at 66mm i went on the hunt for replacements. I ended up buying a complete 250 engine fitted with 350 barrells, fresh 65mm bore with wiseco pro light pistons, Also had rebuilt oem crank. Today i finnished rebuilding the bike. Now it runs the 250 cases, fresh lc crank, the replacement cylinders with wiseco's and the original 350 transmission and clutch assemble. so it's back on the road. looking at replacing the front forks with rz items and buying a hagon rear shock. otherwise i'm witing for mirrors and indicators then paint the bike. I'm really enjoying the Lc.

_________________
yamaha fanatic.


Top
 Profile  
Reply with quote  
PostPosted: Sun Jun 17, 2018 1:38 pm 
Offline
-----
-----

Joined: Sat Feb 08, 2014 5:39 pm
Posts: 1068
Location: Vancouver Is. Canada
Congrats on your perseverance to get back on the road again. No better feeling I imagine from the challanges faced with engine issues. Original mirrors are hens teeth-ish but the aftermarket ones will suffice as I purchased a set (European style) from Yambits. Yet postage was almost the cost of the mirrors then I found originals (lol).


Top
 Profile  
Reply with quote  
PostPosted: Thu Jul 19, 2018 11:41 pm 
Offline

Joined: Sun Jan 29, 2006 2:18 am
Posts: 1101
Location: vancouver
Mikes SX has Darned good replicas for only a few $$ . Live 'n learn :-)


Top
 Profile  
Reply with quote  
PostPosted: Fri Jul 20, 2018 5:49 am 
Offline

Joined: Sun Sep 16, 2012 7:10 am
Posts: 226
Location: gold coast Australia
good info thanks Bare. I own a 79 xs750 that would also like some fresh bits from mikes xs. think i'll order some emulators for the rz forks whilst i'm there.

_________________
yamaha fanatic.


Top
 Profile  
Reply with quote  
PostPosted: Fri Jul 20, 2018 5:08 pm 
Offline
-----
-----

Joined: Sat Feb 08, 2014 5:39 pm
Posts: 1068
Location: Vancouver Is. Canada
The XS was the 1st shaft driven bike (sliver/blue) I've rode - belong to my brother. Having it pop up from the middle upon acceleration was a unique feeling. Like Jon, the yellow was the most attachive to me. Next is mars bar coloring which is my current paint project (Cnd 82 colours). I think most people recall the yellow speed block image of a Yamie as reto-competitive. Nice job on the XS Graham.


Top
 Profile  
Reply with quote  
PostPosted: Wed Aug 08, 2018 7:27 am 
Offline

Joined: Sun Sep 16, 2012 7:10 am
Posts: 226
Location: gold coast Australia
Been working on the lc. Tank and panels are at the painters, engine is on the bench being rebuilt after painting barrells atc.
About to put the head back on and noticed the copper head gasket that was on the bike has deformed around the combustion chamber. No problem i thought i will order an ome gasket. Yamaha Australia told me gasket 4l0-11181-09 Nla. Found some on the net and borrowed one from a local lc owner till order arrives. This is my first oem lc gasket and unlike the many .7mm thick rz350 gaskets i have bought the lc gasket is 1.3mm thick.
With the .6 copper gasket and head shaved the engine had 1mm squish. The new gaaket will obviously enlargen the squish which is not ideal. The head is nearly shaved down to the edge of the bowl, i can't see how i can back to the 1mm squish without going to copper gasket again. Migbt need to order a slightly thicker one to minimize distortion. Hope to have bime back
On the road by sunday. Image

Sent from my SM-A520F using Tapatalk

_________________
yamaha fanatic.


Top
 Profile  
Reply with quote  
PostPosted: Fri Aug 10, 2018 6:39 am 
Offline

Joined: Sun Sep 16, 2012 7:10 am
Posts: 226
Location: gold coast Australia
Picked up a bit of candy today. ImageImage

Sent from my SM-A520F using Tapatalk

_________________
yamaha fanatic.


Top
 Profile  
Reply with quote  
PostPosted: Fri Aug 10, 2018 7:56 am 
Offline
-----
-----
User avatar

Joined: Sun Jun 07, 2009 6:39 pm
Posts: 1278
Location: Macon, GA
Beautiful Graham! That is top notch artistry!

_________________
84 RZ350-Toomeys,SCR milled head, stk 26 carbs,300 M, 35 P, stock regrooved needles AS 2.5 turns out,stk air box,Banshee reeds Zeel non-progr CDI,TSRL Program YPVS,alum rad,R6 shock,GV emulators w/RT springs,fork brace,Shindy steering damper.


Top
 Profile  
Reply with quote  
PostPosted: Fri Aug 10, 2018 9:09 am 
Offline
-----
-----
User avatar

Joined: Sun Jan 28, 2007 12:27 pm
Posts: 2111
Location: Ontario, Canada
Like glass... looks amazing.

I feel like shipping my stuff to Oz to be painted...

_________________
:smt017


Top
 Profile  
Reply with quote  
PostPosted: Fri Aug 10, 2018 2:19 pm 
Offline

Joined: Mon Aug 20, 2012 1:37 am
Posts: 1794
Location: Calgary, Alberta
Hah! I have a set of grips on mine that look identical to yours. I also have those same slotted disks.

Quote:
Inlet side of Piston skirt has been shortened


This is simply a function of running RZ pistons in LC jugs. Its not a performance mod.

graham heise wrote:
Out on the roadImage

_________________
'81 RD350LC hybrid project bike - in pieces currently
'82 RD350LC in '81 colours - Built by "Solo 2" OEM pipes, UNI filters
'90 RZ350F2 with 31K motor, OEM F2 pipes & airbox


Top
 Profile  
Reply with quote  
PostPosted: Sat Aug 11, 2018 4:07 am 
Offline

Joined: Mon Mar 03, 2014 8:44 pm
Posts: 2852
Location: Alberta, Canada
Looks great!

On the plus side, the larger squish will add years to your engine's top end life. Shaved heads on the LCs were like making your engine a time bomb.

_________________
Rory


Top
 Profile  
Reply with quote  
PostPosted: Sat Aug 11, 2018 5:38 am 
Offline

Joined: Sun Sep 16, 2012 7:10 am
Posts: 226
Location: gold coast Australia
Put the bike back together after a tidy up and paint job. Just need to check over everything and add the fluids. Pretty happy with how it's turned out. Just need to ride it. ImageImageImageImage

Sent from my SM-A520F using Tapatalk

_________________
yamaha fanatic.


Top
 Profile  
Reply with quote  
PostPosted: Sat Aug 11, 2018 6:27 am 
Offline

Joined: Sun Sep 16, 2012 7:10 am
Posts: 226
Location: gold coast Australia
hondaror wrote:
Looks great!

On the plus side, the larger squish will add years to your engine's top end life. Shaved heads on the LCs were like making your engine a time bomb.

Can you school me on this rory? How does it make it a time bomb? Won't it make more power?
I thought .9mm is ideal squish? or at least it is on an rz. cooler piston edge, flame burn to the centre and more complete? higher compression? Where does this put undue stress in the engine?
I know you've run plenty of lc's what squish do you run?
I read in the Australian tz forum that guys racing the 250lc's used to lap the cyclinders to the head and run no gasket with .75-.8mm squish.
Can't get my head around a 1,2mm 3 layer oem gasket and having a squish with stock head at nearly 2mm. closer to 1mm would would be better, wouldn't it? I'm here to learn.

_________________
yamaha fanatic.


Top
 Profile  
Reply with quote  
PostPosted: Sat Aug 11, 2018 8:31 pm 
Offline

Joined: Sun Jan 29, 2006 2:18 am
Posts: 1101
Location: vancouver
hondaror wrote:
Looks great!

On the plus side, the larger squish will add years to your engine's top end life. Shaved heads on the LCs were like making your engine a time bomb.



:smt001 Yup the 37 hp ..which is what the Factory Reduced Compression setup generated .. during independent Dyno testings 'back then'.
Lawnboy power Outputs.
Theory is lower stresses could potentially let the engine live a lil longer.. Or it may just seem that way.
Although Not much hard evidence of Shorter than LC engine lives evidenced in RZ engines, which were ultimately of Much reduced squish/ increased compressions.. and ~25 Hp More.


Top
 Profile  
Reply with quote  
PostPosted: Sat Aug 11, 2018 10:15 pm 
Offline

Joined: Mon Mar 03, 2014 8:44 pm
Posts: 2852
Location: Alberta, Canada
I concentrated on intake and exhaust for power boost. Many friends shaved heads and blew up. The LC does not like that mod. It was not allowed in production racing in Canada. Made for exciting times, big boost, put poor longevity.
Pipes and pods drastically change the LC, as well, with great results for reliability if you jetted accordingly.

_________________
Rory


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 35 posts ]  Go to page Previous  1, 2, 3  Next

All times are UTC - 4 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group