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

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PostPosted: Tue Aug 13, 2013 2:11 am 
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Location: Fresno California
I'm considering one of the hotrod kits like the Cheetah or similar big bore kits. I'd like to avoid modifying my cases, so which of the direct bolt-on kits have you guys seen perform well for an overall balanced streetable machine? Some come with the carbs. Also which pipes would I need to get for it?
I have Bassanis now

I'd like to hear from anyone who has done it or helped someone do it

thanks in advance


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PostPosted: Tue Aug 13, 2013 4:33 am 
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...or you could have a google / search the site...

Not being funny, but we seem to get this same question about once a month. Can someone pin one of those threads to the top of this forum I wonder? else shall we add links here and pin this one?

Bikes on this forum with big bores... owned by:

Aaronmvrider: viewtopic.php?f=5&t=7765
Paul Baritakis: viewtopic.php?f=5&t=4044
Peddro: viewtopic.php?f=5&t=3700
Petros: viewtopic.php?f=5&t=3338
Toni 421: viewtopic.php?f=5&t=7621
Me : http://2smoked.com/Yamaha_RD350_LC_421c ... _Home.html
and others...

On other forums:

Brian's LC: Perth Street Bikes forum: http://www.perthstreetbikes.com/forum/f ... ct-127282/
Pete's 421: 2strokesdownunder forum : http://www.2strokesdownunder.com/index. ... topic&t=97
Wigarus/Jeram's 421: http://www.perthstreetbikes.com/forum/f ... tzr-79220/
+ plenty on Norbos forum (RDLCCrazy), but you need to joint to see them...


Peoples thoughts...
(needs some links to threads about riding these but in the meantime):
Brian's thoughts on his 421 so far: http://www.perthstreetbikes.com/forum/f ... gs-164233/ (bottom of page)
Justin (Twinrock's): http://www.perthstreetbikes.com/forum/f ... one-95577/
Reddog on the 421: viewtopic.php?f=1&t=9067

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Last edited by JonW on Fri Aug 30, 2013 8:40 pm, edited 2 times in total.

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PostPosted: Tue Aug 13, 2013 12:08 pm 
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A 421cc, 4mm stroker and 68mm bore is the largest bolt-on kit out there. There are lots to choose from. If you are a little more performance minded the Cheetah cub cylinders are the way to go. This is my personal preference. With the proper setup it is a reliable & driveable motor. The exhaust pipes are probably the most critical component to make a smooth tractable power delivery. I am developing pipes specifically for these engines. I have extensive knowledge in both the RZ & Banshee engines.
There are plenty of other options out there as well & having tested all of them I still prefer the Cheetah cub's setup.

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PostPosted: Tue Aug 13, 2013 3:24 pm 
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Location: Fresno California
ok thanks, I'll look at that setup


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PostPosted: Tue Aug 13, 2013 7:51 pm 
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you will need new pipes.... case mods are easy... for larger cranks if thats the way you want to go..

as far as bolt on go with a 4mm athena or similar.... they seem to be good value and fun per dollar

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PostPosted: Thu Aug 15, 2013 8:08 pm 
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I want reliability.


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PostPosted: Thu Aug 15, 2013 8:11 pm 
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Have you read the links I put up (at some effort LOL)?

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PostPosted: Fri Aug 16, 2013 6:51 pm 
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still sorting through them

I started with yours, and I got pulled into the wicked powerports site and sent him an email. I am waiting for his response.

I'd also be open to buying someone's "old" motor if they are moving up to the next level of insanity


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PostPosted: Fri Aug 16, 2013 7:24 pm 
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Wicked will be slow to respond as he is very busy, ringing him is best.

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


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PostPosted: Sat Aug 17, 2013 12:24 am 
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he already responded. Nice guy, nice product, I just dont have $4000 for an RZ engine


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PostPosted: Sat Aug 17, 2013 12:50 am 
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Sadly doing it properly is never cheap, but do the work yourself and spread the cost, and / or buy stuff used (or new unused - see L.B.'s ad in the For Sale section etc) and you can save money.

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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


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PostPosted: Sat Aug 17, 2013 1:14 am 
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jzanutto wrote:
he already responded. Nice guy, nice product, I just dont have $4000 for an RZ engine

I got 2300 miles on my 421cc now and no regrets. I hadn't $4000 either but i really wanted the kit. I sold a few bits that I didn't need to help fund the project. I ordered the Athena kit and a clutch kit from Roger in the Winter and built the motor. Then in the Spring I ordered pipes, bought some V-Force reeds and a pingle petcock. I have since added carbs & billet intake. Now I'm gonna turn it into a hybrid. If thats your goal, you'll figure it out, just keep plugging away.. Good luck, Keep us posted on your progress... :smt006

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PostPosted: Sat Aug 17, 2013 1:18 am 
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I just built a 421 engine with the kit from Roger at Wicked for just under $2000. And that was with the new billet head for the Athena cylinders. The motor runs real hard now!! But the hit is a little higher up in the RPM range. 7000-10500
I'm loving it!!

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Last edited by RZed on Sat Aug 17, 2013 11:42 am, edited 1 time in total.

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PostPosted: Sat Aug 17, 2013 1:22 am 
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jzanutto wrote:
he already responded. Nice guy, nice product, I just dont have $4000 for an RZ engine



:smt003 :smt003 neither do i .... anymore.... :smt006 :smt006

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PostPosted: Sat Aug 17, 2013 3:50 am 
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Ohh and Aaron's has levitating spark plugs too!

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


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