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Author Topic: Yamaha rd350 Road Racer Liquid Cooled!!  (Read 54619 times)

Offline VonYinzer

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Re: Yamaha rd350 road racer
« Reply #90 on: Aug 05, 2016, 11:51:19 »
Forks are on backwards I believe ;)
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline Hurco550

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Re: Yamaha rd350 road racer
« Reply #91 on: Aug 05, 2016, 11:54:52 »
Forks are on backwards I believe ;)
Brakes don't go out front?
"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 VonYinzer

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Re: Yamaha rd350 road racer
« Reply #92 on: Aug 05, 2016, 11:57:44 »
 :D
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline Hurco550

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Re: Yamaha rd350 road racer
« Reply #93 on: Aug 05, 2016, 12:01:21 »
Ha, I just put them on like the stock Rd was. Oops.


Chances are I'll use the Rd lowers anyways. I'm only using a single rotor. That should be more than enough stop.
"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 #94 on: Aug 05, 2016, 12:08:18 »
As far as I remember, 1975 and earlier had the calipers mounted in front, and later years had them behind.  Behind is much better - especially if running dual discs.  Those iron calipers are heavy!  I don't think there are any issues to swapping the assembly around, the wheel and spacers and speedo drive need to be kept as they are so the speedo will work - just the axle will have to be flipped with the forks.  Not important of course if you won't be using the speedo.
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

Offline Hurco550

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Re: Yamaha rd350 road racer
« Reply #95 on: Aug 05, 2016, 12:09:06 »
Doesn't matter a whole lot.  Matter of fact, you can overtighten the top nut and adversely affect the bearings.  The nut below it, plus the fork tube bolts are doing all the work.  A top nut over it is all that's necessary.  The bottom triple is more important.  The stock R100 top triple I removed was nothing more than 4mm thick piece of plate cut into the shape of a triple.
That's kinda what I figured, the only thing that worried me was the fact that in most cases Yamaha wouldn't put a useless piece of mechanical hardware on if they didn't have to. I remember my buddies top triple on his beamer was just flat plate with bolts as you described as well.

Thanks
"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 Hurco550

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Re: Yamaha rd350 road racer
« Reply #96 on: Aug 05, 2016, 12:14:47 »
As far as I remember, 1975 and earlier had the calipers mounted in front, and later years had them behind.  Behind is much better - especially if running dual discs.  Those iron calipers are heavy!  I don't think there are any issues to swapping the assembly around, the wheel and spacers and speedo drive need to be kept as they are so the speedo will work - just the axle will have to be flipped with the forks.  Not important of course if you won't be using the speedo.
Good to know! Planning on running a single fzr rotor with some kind of modern 2 piston caliper. Should be plenty for as light as I'm hoping this bike will end up. I was contemplating running the caliper behind anyhow. I don't know, but the extra stopping ability makes me nervous as far as pulling on the mount tabs.seems like pushing would be better, but on the same coin I've never seen any brake off. May be over thinking it, but I don't know if there is any benefit performance wise to shifting the weight of the caliper back vs. Front?

Still undecided on a speedo as well. Kinda planning on a tach only with a cell phone mount if I'm curious about my speed =p
« Last Edit: Aug 05, 2016, 12:16:19 by hurco550 »
"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 irk miller

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Re: Yamaha rd350 road racer
« Reply #97 on: Aug 05, 2016, 12:25:07 »
These are what I like to use for double pot adaptations.  I've used them on four bikes so far.  They're cheap, easy to adapt, and plentiful.  There's always a bunch on eBay without hardly a nick.  Suzuki used them on a bunch of their motorcycles...

here http://www.ebay.com/itm/2003-03-Suzuki-gsx600f-front-left-brake-caliper-oem-98-06-katana-2-piston-tokiko-/302033064893?hash=item465292d3bd:g:XN4AAOSwdj9XT7zZ&vxp=mtr




Offline Hurco550

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Re: Yamaha rd350 road racer
« Reply #98 on: Aug 05, 2016, 12:26:34 »
These are what I like to use for double pot adaptations.  I've used them on four bikes so far.  They're cheap, easy to adapt, and plentiful.  There's always a bunch on eBay without hardly a nick.  Suzuki used them on a bunch of their motorcycles...

here http://www.ebay.com/itm/2003-03-Suzuki-gsx600f-front-left-brake-caliper-oem-98-06-katana-2-piston-tokiko-/302033064893?hash=item465292d3bd:g:XN4AAOSwdj9XT7zZ&vxp=mtr


Cool thanks! Link is invalid though, is that katana?
"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 #99 on: Aug 05, 2016, 12:26:36 »
Question on top triple design. Planning on making my own as I don't feel like dropping $235 on this one. I've seen a few like this with the steering stem pinch bolt deleted. How crucial is it to performance/ fork flex ect to keep it intact?
It does have some value, though I can't say how much.  Clamping the top tree to the steering stem to lock it to the lower tree unquestionably stiffens up the assembly - imagine assembling just the upper and lower together and twisting the two trees against each other.  Much more rigid than just clamping down with the upper crown nut.  Most old bikes can have the whole front end twist pretty easily.  Loosen the triple tree pinch bolts and stand astride the front wheel and clamp the wheel between you knees and twist the handlebars.  Big difference when the pinch bolts are tight of course.   
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