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

Technical Forums for Two-Stroke Nuts
It is currently Fri Jun 22, 2018 12:13 pm

All times are UTC - 4 hours [ DST ]




Post new topic Reply to topic  [ 28 posts ]  Go to page Previous  1, 2
Author Message
PostPosted: Fri May 04, 2018 4:46 pm 
Offline

Joined: Tue Nov 12, 2013 2:34 am
Posts: 1036
T.RexRacing wrote:
You guy gotta remember if he's got US spec exhaust it's a catalyst pipe and jetting requirements are totally different than Euro or Canadian spec bikes. Lemme dig in my manual out in the garage for OEM numbers and I'll post up the results.



None of us have said anything about specific jetting numbers.

He has a manual and it seems like he knows his way around those numbers and letters.

catalyst pipes make it even more likely it is a jetting issue.

Go back to standard jetting and start from there. If you need help with jetting there is lots of info. on here and people can help with more specific questions.


Top
 Profile  
Reply with quote  
PostPosted: Fri May 04, 2018 5:18 pm 
Offline
-----
-----
User avatar

Joined: Tue Dec 25, 2012 12:55 pm
Posts: 498
Location: Halifax, NS
I had a NOS set of those Cat pipes a few years and they are like bolting boat anchors on the bike again. If it were me, I would find a set of 31K Canadian pipes to give you the original look and get rid of those ones.

_________________
1985 RZ350F being restored now!
1987 RZ350 Stock
1985 RZ350F basket case
1985 RZ500 Stock


Top
 Profile  
Reply with quote  
PostPosted: Fri May 04, 2018 9:22 pm 
Offline
User avatar

Joined: Sat Oct 10, 2009 4:33 am
Posts: 9566
Location: Sydney
What Rob said!

_________________
My Projects:
Yamaha '85 RZ350 F1 & '83 RZ & RD Athena 421 LC & XT500 Supermoto & Honda MT250... See them all on www.2smoked.com

Like Watches? You will love www.PloProf.com & www.DeskDivers.com


Top
 Profile  
Reply with quote  
PostPosted: Sat May 05, 2018 12:16 am 
Offline

Joined: Thu Apr 26, 2018 11:31 pm
Posts: 11
Also have a set of the original (non catalyst pipe) as well. These are showing some age and banged up a bit.
Preferring the boat anchors mainly due to the condition. Do agree they look a bit tame but objective is originality.

As further background I was at the Mecum motorcycle auction Jan 2018 (Las Vegas) and it was very noticeable the premium that a standard bike gets, not that I am about to sell but something that got me thinking about going down this path. 4 weeks time there is another auction same location, don't see any RZs listed so far but bikes get added right up to the auction. Perhaps some of you planning to attend, or selling.

Really want the 500 but getting kind of pricey.


Top
 Profile  
Reply with quote  
PostPosted: Sat May 05, 2018 12:32 am 
Offline

Joined: Thu Apr 26, 2018 11:31 pm
Posts: 11
Bikes most appropriate for this forum:
https://www.mecum.com/lots/LV0118-31500 ... aha-rz350/
with boat anchors
https://www.mecum.com/lots/LV0118-31502 ... uki-rg500/
https://www.mecum.com/lots/LV0118-31959 ... aha-rz500/


Top
 Profile  
Reply with quote  
PostPosted: Sat May 05, 2018 7:05 am 
Offline
-----
-----
User avatar

Joined: Tue Dec 25, 2012 12:55 pm
Posts: 498
Location: Halifax, NS
I understand your goal and what I do is pack the oem parts away that I remove (air box, pipes, brakes, etc) when I put on aftermarket parts. That way I can ride the guts out of it and still have option to go back to stock look and performance. I have chambers, pods, jetting and triumph brakes done and it is a huge gain in performance and smile factor!! When I’m on a twisty back road I could care care less if it looks stock, I enjoy the roar of pipes and pods. Just my 2 cents

_________________
1985 RZ350F being restored now!
1987 RZ350 Stock
1985 RZ350F basket case
1985 RZ500 Stock


Last edited by Redline Junkie on Wed May 09, 2018 1:03 pm, edited 1 time in total.

Top
 Profile  
Reply with quote  
PostPosted: Wed May 09, 2018 10:26 am 
Offline

Joined: Mon Mar 03, 2014 8:44 pm
Posts: 2734
Location: Alberta, Canada
Redline Junkie wrote:
I understand your goal and what I do is pack the oem parts away that I remove (air box, pipes, brakes, etc) when I put on aftermarket parts. That way I can ride the gusts out of it and still have option to go back to stock look and performance. I have chambers, pods, jetting and triumph brakes done and it is a huge gain in performance and smile factor!! When I’m on a twisty back road I could care care less if it looks stock, I enjoy the roar of pipes and pods. Just my 2 cents

I'm totally with you on this!!!

_________________
Rory


Top
 Profile  
Reply with quote  
PostPosted: Sun May 13, 2018 10:45 pm 
Offline

Joined: Thu Apr 26, 2018 11:31 pm
Posts: 11
As it turned out the pilot and main jets the same as the factory recommended one, so that was not the issue. So back to thinking it is something specific with these exhausts. Their condition is like new but perhaps issues can develop in the catalytic converter when sitting this long, hard to know what is going and how these can be checked. I do have another set but as these are all banged up decided to put the tommey pipe back on and off course up and running great again.
So, for now will run this way.


Top
 Profile  
Reply with quote  
PostPosted: Mon May 14, 2018 10:43 am 
Offline
User avatar

Joined: Fri Nov 01, 2013 8:34 pm
Posts: 1310
Location: back in the hills
You'll do your bike a favor by re-jetting for the Toomey pipes.

_________________
There is only one difference between a madman and me. The madman thinks he is sane. I know I am mad.
Salvador Dali


Top
 Profile  
Reply with quote  
PostPosted: Mon May 14, 2018 10:51 am 
Offline
-----
-----
User avatar

Joined: Sun Jun 07, 2009 6:39 pm
Posts: 1266
Location: Macon, GA
If you are running the stock full airbox with stock linked carbs with Toomey's, see my signature below for my jetting specs to get you in the ballpark. Chuck "Supertune" Quenzler jetted my bike.

Can't imagine anyone using the heavy stock cat boat anchors exhausts unless in a static display for an original bike.

_________________
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: Mon May 14, 2018 8:00 pm 
Offline

Joined: Tue Nov 12, 2013 2:34 am
Posts: 1036
It is possible the cat pipes are badly plugged. It is also possible the stock jetting is too fat. Stock jetting in Calgary on my TZR it will not rev past 6k...


Top
 Profile  
Reply with quote  
PostPosted: Mon Jun 04, 2018 11:08 am 
Offline
User avatar

Joined: Sun Aug 16, 2015 5:55 pm
Posts: 742
Location: Reconquista of California
If I read this right,
1.) your bike has 100% stock jetting? And you
2.) Removed your aftermarket expansion Chambers and reinstalled the OEM catalyzed exhuasts.

And your bike now feels sluggish, slower etc..

If that's the case...there's likley nothing wrong at all, You just restricted your motors potential buy a real and honest 11-13 h.p. as it's a U.S. spec emmisions bike. Your bike will run, as such with a noticable loss of grunt,actually a huge noticable loss, from what your used to.

You can run Chambers on a stock jetted RZ with no problem whatsoever at your elevation, and never worry. Re jetting would have been ideal, but not necessary.

If you were/are attempting to go back, to stock or if in fact the carbs are untouched..I'd leave it stock everywhere.
If I was interested in a stock machine, I'd want absolutely untouched OEM bike.

There's a possibility that your OEM pipes are partially clogged, due to catalyzed material breaking down after 30+ years? or oil/carbonsaturation if they were used for many miles..I'm thinking out loud, but I don't think you could clean them without causing damage to the existing material? But back to my 1st thoughts when reading, the stock pipes are very, very restrictive you just may be hitting that wall. It's something you absolutely would notice, as it's a massive decreases in performance everywhere in the powerband. Your going from high 50s in h.p down into the mid 40 h.p range..it would be a total buzz kill as far as performance.

_________________
Banshee (Baja) race bike, Lonestar A-Arms, dual 9" L.E.Ds, FMF, Toomey,19cc domes, IMS tank, run flats.
96 GSXR SRAD, Future Yoshimura Lucky Strike rep.
85 custom Tri-Z
RZ/YZR track bike(project)
86 VFR750 RC24 Merkel replica (project)


Top
 Profile  
Reply with quote  
PostPosted: Mon Jun 04, 2018 12:33 pm 
Offline

Joined: Thu Apr 26, 2018 11:31 pm
Posts: 11
Yes, you pretty much summed up precisely except the loss of performance is way more than normal, like above 6000 rpm you hit a wall. Standard exhausts now back in the box and useful for mainly for selling on with nice OEM pipes.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 28 posts ]  Go to page Previous  1, 2

All times are UTC - 4 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 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:  
Powered by phpBB® Forum Software © phpBB Group