Yamaha rd350 Road Racer Liquid Cooled!!

Re: Yamaha rd350 road racer

Ply318ci said:
I do and I only work 8 hours a day. But those 8 hours are spent with Jr. High kids. So kind of a trade off I guess.


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Definitely. I'm lucky enough to teach adult education, so I don't have to deal with all that ha
 
Re: Yamaha rd350 road racer

Awesome. Won't lie kind of jealous.


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Re: Yamaha rd350 road racer

Ply318ci said:
I do and I only work 8 hours a day. But those 8 hours are spent with Jr. High kids. So kind of a trade off I guess.


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I couldn't do just Jr High. My sister does, and I don't know how she survives. I have one Jr High class and the rest is high school. Usually one college class a semester for extra money. The college kids are often too lazy.
 
Re: Yamaha rd350 road racer

irk miller said:
I couldn't do just Jr High. My sister does, and I don't know how she survives. I have one Jr High class and the rest is high school. Usually one college class a semester for extra money. The college kids are often too lazy.

I used to teach High School and t is way better. 8th grade is about as young as I can handle teaching. Did elementary for a while to, that was rough.


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Re: Yamaha rd350 road racer

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Tune-A-Fish said:
I thought "Jr. High" was changed to "Middle School"

It is but I am old enough to remember it as Jr. High hard to drop old habits I guess.


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Re: Yamaha rd350 road racer

Got a nice little update. Nick over at adventure co studios cut me out some decals that match the original "patina" on the old fairing. They came out perfect!

Also, Stay tuned as a recent eBay purchase will be showing up that I'm pretty excited about ;)
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Re: Yamaha rd350 road racer

Tune-A-Fish© said:
My son was born in 89
Btw tune, I just figured out how to un block you, still haven't figured out how I did it in the first place though ha
 
Re: Yamaha rd350 road racer

Pretty exciting update, to me anyways. The little booger is gonna be liquid cooled. I picked up a top end from a 1982 rd350lc. From what Ive read, they were never sold state side, but in Europe and Canada. I'm not pioneering anything with this mod, it's been done before a few times, but I really think it will be a neat and useful mod on this bike. It really is pretty close to a "bolt on" mod to the a.c. motor, besides sorting a radiator and probably an electric coolant pump.

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I got the setup on eBay for a tick less than what a new vitos top end kit would cost. It's still stock 54mm bore and came with the pistons. I'll do some thorough measuring to see if they are still usable, but I will likely have to go one over with a fresh set of pistons.
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The seller didn't show the slight detonation damage on the top of one piston and head, but it is really pretty minor and doesn't cause me to much concern. The camera makes it look worse than it is, and I'm hoping it will clean up.
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Another thing he didn't note, and maybe due to him really not knowing, is that they have had some porting work already done to them. It looks to have been done well and nicely, but, until I sit down and measure everything against factory specs, I will not know if it's too much. Teazer, if your seeing this, heads up I may be picking your brain again soon since you were already looking into my pipe specs and pointing me in the right direction on porting of the a.c. barrels.
Looks like they did intake, exhaust and transfer port cleanup at the least, but I don't know how far they took it.
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Re: Yamaha rd350 road racer

hurco550 said:
Pretty exciting update, to me anyways. The little booger is gonna be liquid cooled. I picked up a top end from a 1982 rd350lc. From what Ive read, they were never sold state side, but in Europe and Canada. I'm not pioneering anything with this mod, it's been done before a few times, but I really think it will be a neat and useful mod on this bike. It really is pretty close to a "bolt on" mod to the a.c. motor, besides sorting a radiator and probably an electric coolant pump.

I have a real good EX250 radiator, even has a fan on it but could be removed

eBay images but same same chit mang :eek:
s-l1600.jpg

s-l1600.jpg
 
Re: Yamaha rd350 road racer

Tune-A-Fish© said:
I have a real good EX250 radiator, even has a fan on it but could be removed

eBay images but same same chit mang :eek:
s-l1600.jpg

s-l1600.jpg
Thanks man, but I think I'll go with this one. $44 shipped and the inlet and outlet are much closer to where they will need to be.

Look at this on eBay http://www.ebay.com/itm/162214043755
 
Re: Yamaha rd350 road racer

In terms of porting all I can say is "we know nuuthing" in best Sergeant Shultz accent. ;-) That radiator is insanely cheap. And just as I was thinking that the EX rad might be a nice cheap way to go.

The reed cages look as if they may have been opened up to take RZ350 reed blocks. If not go with YZ85 cages.

I hope that piston is 64mm (350) and not 54mm (250) but either will work. Just not the same way. When you get a chance to map the ports, I can tell you if they are stock or modified. The inlets look OK but could be improved at the liner. They are better than any RD aftermarket I have looked at so far.
 
Re: Yamaha rd350 road racer

hurco550 said:
Thanks man, but I think I'll go with this one. $44 shipped and the inlet and outlet are much closer to where they will need to be.

Look at this on eBay http://www.ebay.com/itm/162214043755

Looks like a steal. Make sure you do a mild pressure test before running it on the bike. Not that you'll be dealing with any insane numbers down the road, but when you find deals like that there's always the chance the manufacturing isn't 100% solid. I'm sure you can find a decent fabricator around to fix up any possible failures though ;)
 
Re: Yamaha rd350 road racer

teazer said:
In terms of porting all I can say is "we know nuuthing" in best Sergeant Shultz accent. ;-) That radiator is insanely cheap. And just as I was thinking that the EX rad might be a nice cheap way to go.

The reed cages look as if they may have been opened up to take RZ350 reed blocks. If not go with YZ85 cages.

I hope that piston is 64mm (350) and not 54mm (250) but either will work. Just not the same way. When you get a chance to map the ports, I can tell you if they are stock or modified. The inlets look OK but could be improved at the liner. They are better than any RD aftermarket I have looked at so far.
My bad, they are indeed 64mm bores and 350 barrels. That was my mistake when typing.

The reed openings are the same as my stock ac barrels in width. I've already bought yz125 petals to replace the stock ones, but if the 85's are better, I'll go with those instead.
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I got some time tonight to sit down and map the ports. All dimensions for the air cooled barrels were taken from one of my un molested ac barrels, and the dimensions from both my lc barrels. The port dimensions from one lc barrel to the next were about spot on. I've read a few articles on correctly measuring transfer port dimensions at the "right" angles to get the most out of accurately figuring port time windows, but for a little greater ease, I measured straight on for the sake of comparing apples to apples. If this is not acceptable, let me know and I'll go more in depth with aligned with the angle measurements.
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Here is how ports were measured.
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All comparisons from ac barrels to lc barrels.

Transfers.
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Aux port.
Widened 6.5mm
Lowered .75mm
Raised 2.5mm

Main transfer port
Widened 2mm
Floor up 2mm but same over all height

Intake
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7th port
Raised 2mm
Widened 1mm

"Main port" (if that's the correct terminology)

Lower 3.1mm at top
Lower at floor 2.5mm
Widened 1.75mm

Exhausts
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Raised 2.5mm
Over all height 1mm
Widened 6mm


Here are a few pictures comparing port shapes

Ac intake
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Lc intake
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Ac exhaust
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Lc exhaust
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The other thing I'm unsure of is the state of the liner cut away of the lc barrels vs the ac barrels at the base.

Ac
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Lc
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From what I can tell online is that the lc barrels came this way factory.

The closer I look the better the actual porting work itself looks quality wise, especially vs the stock porting of the ac barrels. That said, I'm really hoping nothing was taken to far.

As usual, ANY advice from you gurus will be most appreciated!
 
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