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

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PostPosted: Thu Nov 02, 2017 8:07 am 
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Location: Houston texas
I wonder why Yamaha made the cylinders left and right when they could of been a single casting ,
i beleive the TZ is a single unit .
i dont see a cost saving ?
cheers Mark

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350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride


1982 YAMA RD350LC
2004 BMW R1150RT
1989 FZR1000
1994 FZR1000


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PostPosted: Sun Nov 05, 2017 3:00 pm 
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Good question , try reposting it on the UK site rd crazy..or I can if you like..
Paul


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PostPosted: Sun Nov 05, 2017 3:22 pm 
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Location: Niagara Ontario Canada
My guess is its cheaper somehow to make them separate.
:smt017

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PostPosted: Sun Nov 05, 2017 4:24 pm 
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Yes maybe the tz cylinders were cast in one unit because the bores were plated . Lc cylinders have iron liners.


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PostPosted: Mon Nov 06, 2017 6:53 am 
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There could be all kinds of non parts manufacturing reasons. It might be easier to assemble the engines with separate cylinders, or take less skill/precision to do it without the risk of failure. Mass production assembly versus race department low volume assembly, time matters. Maybe they were trying to keep warranty costs down, why replace 2 cylinders when only one failed? Boring and honing single cylinders in mass production would definitely be cheaper from an investment point of view, and as mentioned above iron liners could play into it as well. They would be cast in, which wouldn't be a challenge, but machining the bottom would be a more costly process than a mass production single. Pennies (Yen) saved on each bike add up when you are building tens or hundreds of thousands.


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PostPosted: Mon Nov 06, 2017 11:15 pm 
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Joined: Fri Nov 22, 2013 10:49 pm
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Location: Houston texas
thanks for the input guys .
some food for thought there.
cheers mark

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350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride


1982 YAMA RD350LC
2004 BMW R1150RT
1989 FZR1000
1994 FZR1000


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