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Author Topic: Yamaha rd350 road racer  (Read 13985 times)

Offline hurco550

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Re: Yamaha rd350 road racer
« Reply #75 on: Jul 28, 2016, 20:30:07 »
Man, I love hearing you guys that know your stuff talk!

Just got back in town. Went back up to the salvage yard where I got the bike in the first place, and picked up the important part.... he found the title so now I don't have to go the Vermont route! It's already open notorized to boot.


Also traded him one of the akront hoops for a xs650 high shoulder that should lace right up with out much issue. The one i traded was for a non symmetric hub (probably ducati) and wouldn't have laced right. I have to un lace this hub and give it back to him.

« Last Edit: Jul 28, 2016, 20:33:27 by hurco550 »
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"


Offline hurco550

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Re: Yamaha rd350 road racer
« Reply #77 on: Jul 28, 2016, 21:03:44 »
I dunno why, but it's very satisfying to unlace a wheel with a pair of bolt cutters.
He wants the crusty old spokes back =/
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"

Offline clem

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Re: Yamaha rd350 road racer
« Reply #78 on: Jul 28, 2016, 22:42:07 »
Of course one day he'll get around to re plating those old things.

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

Offline hurco550

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Re: Yamaha rd350 road racer
« Reply #79 on: Jul 28, 2016, 22:47:24 »
Of course one day he'll get around to re plating those old things.

Sent from my SAMSUNG-SM-G920A using DO THE TON mobile app
Ha, this guy, well two brothers have been at the M.C. salvage business for years. NOTHING gets pitched, which is probably part of why they have over 700 bikes + gobs of parts. I remember my first trip over there. I needed some parts, one of which was a fuse box for a cb550.the old one was trashed, cracked plastic, broken tabs and what not. They had me bolt it on the parts bike in place of the one I got. Seriously, nothing gets thrown away there lol
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"

Online Sav0r

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Re: Yamaha rd350 road racer
« Reply #80 on: Jul 30, 2016, 01:02:27 »
Make sure you put your old steel rims on scale to compare to those shouldered set. Some shouldered rims can be damned heavy and those old steel units aren't as heavy as you might think. Tires of course make up the major rotating mass there, but every little bit helps.
Sav0r the adventure.

Visit www.chrislivengood.net to get more information on my RD350 dubbed Mia Wallace as well as my other projects and snafus.

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Offline hurco550

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Re: Yamaha rd350 road racer
« Reply #81 on: Jul 30, 2016, 02:23:09 »
Make sure you put your old steel rims on scale to compare to those shouldered set. Some shouldered rims can be damned heavy and those old steel units aren't as heavy as you might think. Tires of course make up the major rotating mass there, but every little bit helps.
I'll look into that when I get them un laced, they were heavier than I expected when I picked them up. Bad thing is the steel hoops are in pretty shabby condition.

Thanks!
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"

Offline hurco550

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Re: Yamaha rd350 road racer
« Reply #82 on: Jul 30, 2016, 02:29:02 »
Not a huge update, but I made up an arbor to do my squish machining when that time comes. I have yet to put an indicator on it to see if the plug holes are centered, as I've read that sometimes they aren't. I also still have to take a light mill cut off of the spark plug surface to make sure that it is true with the gasket surface before doing any machining.

I used a buddy's lathe to make the arbor. He is tooled up a bit better than I am at the moment, plus his lathe has a dro, which makes everything easier.







I'll use my South Bend 9 when the time comes.


Didn't think about clearance of the bed, but I have a half inch, which is about a mile in machinist terms, so it's all good.
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"

Offline teazer

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Re: Yamaha rd350 road racer
« Reply #83 on: Jul 30, 2016, 11:29:27 »
That is looking very professional.  I need to get my machinist to make an arbor for our nexyt project to do exactly what you are doing there.

Offline hurco550

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Re: Yamaha rd350 road racer
« Reply #84 on: Jul 30, 2016, 16:10:29 »
THANKS!  I used a stud drilled and tapped into the arbor instead of single point threading. Luckily my buddy is a mechanic and had a 14mmx1.25 tap on his service truck and a harmonic balancer bolt of the same size and thread pitch to rob for the threaded lug.
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"

Offline hurco550

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Re: Yamaha rd350 road racer
« Reply #85 on: Aug 04, 2016, 21:39:45 »
Again, not a ton to update, but I did get the tapered neck bearings fitted.



Xs650 forks mocked up. They are about 2 inches longer than the Rd units, so they have to go up through the top tree a bit. I thought about flipping the top tree upside down, but that looks pretty goofy.


What's you guys advice on the steering damper? Worth keeping? Not worth keeping? Does it even make a difference?
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"


Offline hurco550

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Re: Yamaha rd350 road racer
« Reply #87 on: Aug 04, 2016, 21:56:23 »
Put that damper on your camera  :o whooooooaaaahhhhh  :-[
It worked.
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"

Offline hurco550

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  • Life is short. Smile while you still have teeth.
Re: Yamaha rd350 road racer
« Reply #88 on: Aug 05, 2016, 10:38:06 »
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?
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
1976 cb500t/xr600 engine swap. Project Bratard: http://www.dotheton.com/forum/index.php?topic=66356.msg761910#msg761910
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
Snowmobile powered Hardtail:http://www.dotheton.com/forum/index.php?topic=68937.msg802456#top

"Knowledge is the only thing you can truly own, for you can sell it or give it away and still keep it"

Online irk miller

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Re: Yamaha rd350 road racer
« Reply #89 on: Aug 05, 2016, 11:34:19 »
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.