Manual options for the leak prone RZ petcock

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75RD350rider
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Manual options for the leak prone RZ petcock

#1 Post by 75RD350rider » Wed Feb 24, 2016 12:57 pm

I ordered a manual replacement petcock for the RZ as I have never had good luck rebuilding the vacuum variety. It came as a single outlet smaller than the factory petcock and I am concerned about having enough flow volume for my motor. Long story short I was sorting through my Yamaha parts pile and came across a RD 400 manual petcock in good shape and lo and behold it fits the RZ tank.
I am sure Y'All probably already knew that but I just learned it. I have a plan for an adapter I am going to construct with a spare factory RZ button to attach to the manual RD 400 petcock handle. When all is said and done it will look factory and be a manual dual outlet petcock. More to follow...
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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RuZty
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Re: Manual options for the leak prone RZ petcock

#2 Post by RuZty » Wed Feb 24, 2016 9:21 pm

I've had my RZ for nearly 20 years and replaced the petcock seals maybe 15 years ago, never had the slightest trouble with it. Maybe the body on yours has some wear or roughness making it difficult to get a seal. Nice when you find alternate parts that work without leaving your house.
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75RD350rider
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Re: Manual options for the leak prone RZ petcock

#3 Post by 75RD350rider » Thu Mar 10, 2016 6:00 pm

Image

Stage 1 complete. Fabrication to adapt stock petcock knob to the dual outlet RD 400 manual petcock to follow..Image7
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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75RD350rider
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Re: Manual options for the leak prone RZ petcock

#4 Post by 75RD350rider » Mon Mar 14, 2016 2:04 am

Image

More.progress. An allen head bolt modded with dremel and turned down with the bench grinder....
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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75RD350rider
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Joined: Thu Jun 19, 2014 9:52 pm

Re: Manual options for the leak prone RZ petcock

#5 Post by 75RD350rider » Mon Mar 14, 2016 2:07 am

Image

All the pieces laid out.
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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75RD350rider
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Re: Manual options for the leak prone RZ petcock

#6 Post by 75RD350rider » Mon Mar 14, 2016 2:15 am

Image

Final mockup. The hole was drilled and tapped all the way through the the knob. The screw is threaded into both the knob and through the hole.drilled in the allen head bolt. It turns the petcock easily. Mount the petcock.to the tank next and install the sidecover so I can align the knob, mark the last hole to drill.
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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JonW
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Re: Manual options for the leak prone RZ petcock

#7 Post by JonW » Mon Mar 14, 2016 3:15 am

Great solution, nice work with simple tools and spare time, we like!
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two-stroke-brit
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Re: Manual options for the leak prone RZ petcock

#8 Post by two-stroke-brit » Mon Mar 14, 2016 1:57 pm

Like it. :smt023
350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
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75RD350rider
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Re: Manual options for the leak prone RZ petcock

#9 Post by 75RD350rider » Mon Mar 14, 2016 8:04 pm

Image

Done and installed...
Last edited by 75RD350rider on Mon Mar 14, 2016 8:57 pm, edited 2 times in total.
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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75RD350rider
Posts: 607
Joined: Thu Jun 19, 2014 9:52 pm

Re: Manual options for the leak prone RZ petcock

#10 Post by 75RD350rider » Mon Mar 14, 2016 8:09 pm

Image

Near perfect fit
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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75RD350rider
Posts: 607
Joined: Thu Jun 19, 2014 9:52 pm

Re: Manual options for the leak prone RZ petcock

#11 Post by 75RD350rider » Mon Mar 14, 2016 9:15 pm

Had a seep from the sediment bowl. Went through my John Deere o-rings and found a suitable short term substitute. I will be ordering a proper o-ring as I am unsure if the JD part is ethanol resistant...
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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75RD350rider
Posts: 607
Joined: Thu Jun 19, 2014 9:52 pm

Re: Manual options for the leak prone RZ petcock

#12 Post by 75RD350rider » Mon Mar 14, 2016 10:36 pm

Thanks !
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA
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