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Author Topic: Yamaha rd350 Road Racer Liquid Cooled!!  (Read 53383 times)

Offline teazer

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Re: Yamaha rd350 road racer
« Reply #150 on: Aug 29, 2016, 20:18:27 »
Oh dear.  That's a bit crusty, to be polite.

Good crank with all new seals is a must have and I like your choice of pistons and carbs. 

I made the silly mistake of looking at a Banshee motor to drop into an RD frame for drag racing and that took me to 421 cub kits and long stroke cranks and Oh My that stuff is not cheap.  Nice to look at and dream about but spendy.  The Vito's cranks are remarkably cost effective compared to rebuilding an old crank, after you factor in new rod kits and bearings plus assembly labor and you still have an old crank that may have been revved too hard.  That said, I have never bought a NEW crank.  I have had a few rebuilt over the years by different people.  before you buy a crank, call around and see what the cost would be to get a professional crank rebuild from a specialist shop.

Online Hurco550

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Re: Yamaha rd350 road racer
« Reply #151 on: Aug 29, 2016, 20:31:52 »
Oh dear.  That's a bit crusty, to be polite.

Good crank with all new seals is a must have and I like your choice of pistons and carbs. 

I made the silly mistake of looking at a Banshee motor to drop into an RD frame for drag racing and that took me to 421 cub kits and long stroke cranks and Oh My that stuff is not cheap.  Nice to look at and dream about but spendy.  The Vito's cranks are remarkably cost effective compared to rebuilding an old crank, after you factor in new rod kits and bearings plus assembly labor and you still have an old crank that may have been revved too hard.  That said, I have never bought a NEW crank.  I have had a few rebuilt over the years by different people.  before you buy a crank, call around and see what the cost would be to get a professional crank rebuild from a specialist shop.

bill bune is $150 labor + parts for rebuild and true
economy cycle is $580 with parts besides center labyrinth seal (which mine may very well need)
My local guy (mototech usa) is about $130 for labor plus parts
even my local guy at $130 would only leave $270 for parts (comparing it to the $400 vitos unit), which would be cutting it close for new bearings, seals and conrods I would think.

also will stock rd carbs fit into stock banshee manifold?
"If you want safety and sanity don't mess around with choppers to begin with and don't come crying to me for recommending something that broke down the line. You're going to be the "builder" so use your own judgment and build to you own personal levels of safety and sanity." - Chopper Handbook
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline teazer

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Re: Yamaha rd350 road racer
« Reply #152 on: Aug 29, 2016, 20:34:23 »
Lab seals rarely wear out.

Yes on the manifolds.  I used them on a couple of RD projects years ago. Jetting may change slightly in the midrange IIRC but pipes and filters will have more impact that the balance tube.

Online Hurco550

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Re: Yamaha rd350 road racer
« Reply #153 on: Aug 29, 2016, 20:40:12 »
Lab seals rarely wear out.

Yes on the manifolds.  I used them on a couple of RD projects years ago. Jetting may change slightly in the midrange IIRC but pipes and filters will have more impact that the balance tube.

honestly not super familiar with lab seals, but ive heard that they rarely go bad. I am just concerned about the overall shape of the crank. pretty sure that there had been water in the crank, and the whole thing may be crusty. ill find out once I finally get this top end apart and get the cases split.

Thanks for the info on the banshee boots!
"If you want safety and sanity don't mess around with choppers to begin with and don't come crying to me for recommending something that broke down the line. You're going to be the "builder" so use your own judgment and build to you own personal levels of safety and sanity." - Chopper Handbook
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline clem

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Re: Yamaha rd350 road racer
« Reply #154 on: Aug 29, 2016, 22:54:00 »
Hey man I've got the MZB on my DS7. It was an easy install, the wiring is not that hard to figure out. I have run without the battery as well. PM me if you need any help, I hate typing after work hours.
I also ordered some .75mm over prox banshee pistons Friday to find out that they are back ordered everywhere. They should come available mid September.

Sent from my SAMSUNG-SM-G920A using DO THE TON mobile app

"After every war there are soldiers who refuse to surrender. To this day there are still thousands who cling to their 30+ year old motorcycles, thinking that the war is still on, refusing to concede that the four-strokes have won"

1972 DS7 http://www.dotheton.com/forum/index.php?topic=45886.msg505995#msg505995
1983 CB550sc bobber http://www.dotheton.com/forum/index.php?topic=30599.30

Online Hurco550

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Re: Yamaha rd350 road racer
« Reply #155 on: Aug 29, 2016, 23:34:45 »


Hey man I've got the MZB on my DS7. It was an easy install, the wiring is not that hard to figure out. I have run without the battery as well. PM me if you need any help, I hate typing after work hours.
I also ordered some .75mm over prox banshee pistons Friday to find out that they are back ordered everywhere. They should come available mid September.

Sent from my SAMSUNG-SM-G920A using DO THE TON mobile app

Thanks man, Will probably take you up on that. My two weakest points are electrical and paint, and since this isn't getting a paint job per say (leaving the fairing as is) that just leaves electrical as my biggest pain at this point. I'm really planning super minimalist on the electrical on this, headlight tail/ brake lights and turn signals with a kill switch and hoping no battery. Definitely no dummy lights or any of that.

I am still a little ways away from ordering pistons so hopefully it won't be bad when it gets to that point, and my jugs are stock bore, so .25 over should do it hopefully. I think there are a few sets of those on feebay right now
"If you want safety and sanity don't mess around with choppers to begin with and don't come crying to me for recommending something that broke down the line. You're going to be the "builder" so use your own judgment and build to you own personal levels of safety and sanity." - Chopper Handbook
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline jpmobius

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Re: Yamaha rd350 road racer
« Reply #156 on: Aug 29, 2016, 23:36:00 »
I like the MZB as well (making an assumption - link seems not to work for me).  Can verify the Rz manifolds to work fine but have not seen distinct benefit with the cross over tube.  Certainly no downside in my experience though.  I like the pro-x banshee pistons too.  MZB is great for no battery.  I really like the OEM Banshee set up for ignition but it requires a custom crank - not bad if you are building new already.  Super reliable.  Check with your machinist before ordering pistons.  If you do only one modification, re-machine the heads and cylinder tops and use o-rings instead of the copper gaskets.
« Last Edit: Aug 29, 2016, 23:42:38 by jpmobius »
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0


Online Hurco550

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Re: Yamaha rd350 road racer
« Reply #158 on: Aug 30, 2016, 01:31:22 »
"If you want safety and sanity don't mess around with choppers to begin with and don't come crying to me for recommending something that broke down the line. You're going to be the "builder" so use your own judgment and build to you own personal levels of safety and sanity." - Chopper Handbook
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Online Hurco550

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Re: Yamaha rd350 road racer
« Reply #159 on: Aug 30, 2016, 13:49:12 »
Been doing some reading on gasket matching. Any of you guys done it? Is it worth doing? Any real benefits seen from it on rd's?
"If you want safety and sanity don't mess around with choppers to begin with and don't come crying to me for recommending something that broke down the line. You're going to be the "builder" so use your own judgment and build to you own personal levels of safety and sanity." - Chopper Handbook
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet