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Author Topic: Yamaha rd350 Road Racer Liquid Cooled!!  (Read 25227 times)

Offline 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!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
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
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

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!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
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
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

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!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
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
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

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!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
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
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot


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!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
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
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

Offline HURCO550

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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!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
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
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
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

Offline 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.