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

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PostPosted: Sun Apr 16, 2017 6:42 am 
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Joined: Sun Sep 16, 2012 7:10 am
Posts: 171
Location: gold coast Australia
G'day race fans. Wondering what sort of weight an rz350 would be in race trim. all road gear removed. just a tacho, maybe tz style fiberglass seat. I'm thinking of building a track bike with whats laying around. i have some good low weight chambers. i weighed my street rz today with a full tank it came in at 175kg. that bike is a 31k with chambers. i'm thinking a stripped rz could be 20-25 kg lighter then street??

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yamaha fanatic. bikes, 1984 stock rz350. 1983 rz350 tuned, 1985 rz250, 1988 rz250r, 69 yl3 100cc , 87- tzr250, 67- yas1 125, 67 yr1 350. 67 ym2 305. 77 dt175. 2000 Yzf1000r ace, 79 xs750f, 2001 wr426, 2002 fzr400rrsp ,2016 R1.


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PostPosted: Sun Apr 16, 2017 3:24 pm 
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Joined: Fri Nov 01, 2013 8:34 pm
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Location: back in the hills
WHEELS.........some heavy muthas.

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PostPosted: Sun Apr 16, 2017 8:26 pm 
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Joined: Fri Oct 03, 2003 11:11 pm
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Location: Southern Ontario, Canada
I put some '86 wheels on my '85, they were nearly 2 lbs lighter per wheel, and they look it.


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PostPosted: Thu Apr 27, 2017 3:50 am 
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Joined: Mon Mar 03, 2014 8:44 pm
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Location: Calgary, Alberta, Canada
I have a 31K, I just cut about 2 kg of tabs and frame tube off. Going to mount the AirTECH bodywork to. I'll do a weigh in when it's finished.

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PostPosted: Thu Apr 27, 2017 12:13 pm 
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Joined: Tue Nov 12, 2013 2:34 am
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You are talking 55lbs lighter? I doubt it without some real cash.

The glass fairings are heavier than stock.

The pipes are most definitely lighter but less than everyone claims. "save 35 pounds on pipes!" Not a chance. Maybe 10?

5 pounds if you remove the plastic cladding, oil tank, pump etc.
10 pounds with your pipes
5 pounds with lightweight battery.
Pound for gauges
pound for shock
4 pounds for wheels
2 pounds F2 rearsets

Where does the last ~30 pounds come from?


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PostPosted: Thu Apr 27, 2017 12:26 pm 
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Joined: Mon Aug 10, 2015 8:57 pm
Posts: 173
Location: Ottawa, Canada
evan_calgary wrote:
You are talking 55lbs lighter? I doubt it without some real cash.

The glass fairings are heavier than stock.

The pipes are most definitely lighter but less than everyone claims. "save 35 pounds on pipes!" Not a chance. Maybe 10?

5 pounds if you remove the plastic cladding, oil tank, pump etc.
10 pounds with your pipes
5 pounds with lightweight battery.
Pound for gauges
pound for shock
4 pounds for wheels
2 pounds F2 rearsets

Where does the last ~30 pounds come from?


mudguard/license bracket, tail light, grab handle, seat, headlight, signals, maybe chop down the fairing stay, superbike bars -> clip ons, kickstand, center stand . I'd say you're getting close to 30lbs.


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PostPosted: Sun Apr 30, 2017 11:17 pm 
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Joined: Mon Mar 03, 2014 8:44 pm
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Location: Calgary, Alberta, Canada
You should be able to get close to 250 pounds if you got aggressive with the weight reduction, dry weight. Not an easy task.
Going premix and dumping the autolube system, kick starter and cluster is another good dump. As mentioned, signals, speedo, all associated wire, drilling all washers, lighter wheels, a seat kit is a helluva lot lighter then the seat, bracketry, and lighting, and rear bodywork. Cutting all associated tabs off the frame, cutting the clutch case excess off after oil pump removed, aluminum swingarm..and the list goes on.
The TZ250s of the early 80s were about 220 lbs dry.

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PostPosted: Mon May 01, 2017 3:00 pm 
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Joined: Sat Nov 26, 2005 11:44 am
Posts: 382
Location: Wolfenb├╝ttel, Germany
My race RZ has 132kg with affordable effort.
R6 front end incl. brakes & rim, DIY aluminium tank and subframe, RGV swinger, 5x17 KTM spoked rear + cut off every bracket on the frame
Unfortunately the rider is constantly adding a few kg per year....

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PostPosted: Wed Aug 16, 2017 10:41 am 
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Joined: Tue Jan 09, 2007 9:03 pm
Posts: 641
Location: Whitby Ontario canada
my race rz was also 290lbs (131kg) thats with
-going to 17" (1990 gsxr wheels)
-gpl pipes
-alu swingarm
-stripped out frame with gusseting added (it was still only 22 lbs)
-total loss ignition with tiny battery
-airtech bodywork/seat
-different forks
-custom alu. rearsets

I'm hoping to make some changes that will lower that some more. r6 front wheel (with only one brake rotor and caliper), yzf600 rear wheel (with swiss-cheese brake rotor), alu tank, and alu tail section.
i think that'll get it down another 10 lbs.

id love to do some more trick stuff like
switching out fasteners to Ti, Ti chambers, magnesium wheels, fiberglass/carbon tank.
BUT that shit is expensive! mag wheels would be at least $5k for 2 sets (slicks and rains)

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Porting&pipes by GPL racing, hotrods 4mm crank,
mikuni36mmTM, zeel ignition, V-Force4, gusseted 86frame, Fz600 swingarm, 89gsxr750 wheels&brakes, Elka shock, fzr600 forks with r6 internals fitted by accelerated tech


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PostPosted: Thu Aug 31, 2017 3:43 am 
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Joined: Sun Aug 16, 2015 5:55 pm
Posts: 676
Location: Reconquista of California
Graham, as mentioned above. About 10 lbs above or below the 300 lb mark, is what you will be looking at, as stated anything below the 290 lb range, starts to cost serious money & customization $.

I would never expect to view a RZ anywhere below 270 lbs, no matter what even w everything listed above and adding carbon bodywork and rims & a couple thousand dollars of Titanium into the mix. At that point , there's just nowhere else to realistically go with what you have.

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1984 RZ350 Y/B KR stock
1989 GSXR Yoshimura chassis,Magnesium everything.1213cc, Rwhp@165h.p/97lbs tq. TI 4-1,Technomagneisios.
85 YTZ250 Tri-Z
1985 YZR /RZ Franken bike track toy,( Under const.still..lol! ) HRC front,400RR rear/MAGTEKs ,385-421cc?


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