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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - New toy... RD350


New toy... RD350
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K5
Commuter
Commuter


Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Thu Mar 12, 2015 5:20 pm    Post subject: New toy... RD350 Reply with quote

Haven't had a two stroke for years, found this one recently. It's a 1974 RD350A. I'm the 3rd owner. Plans are to clean it up, do some maintenance, install some pipes & maybe rejet the carbs. Nothing too radical. It'll go back to stock form after another RD350 gets a cafe' treatment.

Here's a few pics.






Looks good from a distance. It's got its share of scrapes, scratches & dents.
I'm sure I'll have questions, so please chime in if you have any comments or see me going south.
I'll try to be prompt with updates as the work progresses.

_________________
-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
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05c50
Full Throttle
Full Throttle


Joined: Oct 26, 2007
Posts: 2990
Location: Greensburg Pa

PostPosted: Thu Mar 12, 2015 5:29 pm    Post subject: Reply with quote

Nice find. Looks like it's pretty much all there. Should make a good project.

.....Paul

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�77 CB550f
�77 CB750a
�78 GL1000
�80 CB650c
�75 GL1000-finally finished
�79 KZ200
68 CB450K1-taking up all my time
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K5
Commuter
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Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Thu Mar 12, 2015 6:12 pm    Post subject: Reply with quote

Thanks Paul, any chance you have a spare headlight laying around Very Happy
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-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
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05c50
Full Throttle
Full Throttle


Joined: Oct 26, 2007
Posts: 2990
Location: Greensburg Pa

PostPosted: Thu Mar 12, 2015 6:22 pm    Post subject: Reply with quote

Sorry, wish I could help, but no old Yamy parts laying around. Now a light for an old Honda, I might be able to help.

.........Paul

_________________
�77 CB550f
�77 CB750a
�78 GL1000
�80 CB650c
�75 GL1000-finally finished
�79 KZ200
68 CB450K1-taking up all my time
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Rizingson
Gear Head
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Joined: Oct 30, 2009
Posts: 1809
Location: Parker, CO

PostPosted: Thu Mar 12, 2015 8:33 pm    Post subject: Reply with quote

Great find, Ray. Nice an complete, just like I like 'em.
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KirkN
Gear Head
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Joined: Feb 23, 2007
Posts: 1289
Location: Orlando, FL

PostPosted: Fri Mar 13, 2015 7:57 am    Post subject: Reply with quote

Wow, looks really nice. Sounds like a nice project.

Maybe your pictures will be an inspiration to me to get off my duff and get busy on my own RD250 project, which I mentioned nearly a year ago, and which I've done nothing with yet. Sad Smile

Kirk
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K5
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Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Fri Mar 13, 2015 9:17 am    Post subject: Reply with quote

Thanks guys!

PO mentioned he was using pre-mix because he wasn't sure the pump was working... hmmm.
Well, I'm of the belief that if one thing is suspect; I better look into a few other things.

So, plans are to pull the engine, take the jugs off, do an inspection, check specs & hopefully get by with just gaskets and a few misc parts.

Pump looks like it was worked on. Good news, the oil line had oil in it, and the tank had about a pint left.


Sprockets and chain are marginal, got some new ones on the way.
Can't believe it has a 530 chain, Wow Shocked
Will retain the stock points & condenser versus going electronic


PO said the carbs had been cleaned and adjusted. Also mentioned the rectified & regular were replaced. Come to find out they were replaced with modern aftermarket electronic versions.
Gotta dig them out.


I'll have more next week. Need to get things cleaned up and ready for the workshop on Sunday.

_________________
-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
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K5
Commuter
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Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Mon Mar 16, 2015 5:29 am    Post subject: Reply with quote

Had a little time last night, and removed the heads, cylinders & pistons. Did this to check their condition because of a possible oil pump feed problem. Things look well lubricated.

Both cylinders are standard size. The left is in great shape.
The right looks like something got sucked through the intake and scored the piston and cylinder. Looks worst than it really is. Thinking of honing the cylinder and lightly cleaning up the piston.

Here's some pics. Gladly take your comments & suggestions (especially on what type of hone to use)





The plot thickens... opposite of the intake, just next to the exhaust port I found this.


Looks to be where the top ring gap is. Feeling it with my finger, can't feel it, but with my fingernail; there's fine scratches. Not deep, thinking the hone might work this out. Got late so didn't have time to closely inspect the piston & ring to see what's going on.

With the pistons disconnected from the rods, I cranked the engine over and heard what sounded like a ratcheting noise. I think it's coming from the oil pump?

_________________
-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
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dorT500
Full Throttle
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Joined: Jul 10, 2008
Posts: 3222
Location: Galveston County, Texas

PostPosted: Mon Mar 16, 2015 10:25 am    Post subject: Reply with quote

K5 wrote:
.............Looks to be where the top ring gap is. Feeling it with my finger, can't feel it, but with my fingernail; there's fine scratches. Not deep, thinking the hone might work this out.
What about this area.....or am I seeing things? Remember all the ports need to have specific chamfering done on them to avoid catching a ring or premature ring wear. Not saying that is what caused the marks but best to keep that in mind. Might send out the cylinders to someone very familiar with two strokes. Good Luck


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K5
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Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Mon Mar 16, 2015 10:59 am    Post subject: Reply with quote

I agree.
After cleaning up the cylinders and pistons. Ends up they've been bored .025mm over. The #2 cylinder with the wear, has a piston to cylinder clearance of .0347"... too much. I'm on my way to see Chris & Tom at Action Cycle. They've got some experience with these machines, and will inspect, bore & hone. Looks like new pistons are in my future.

_________________
-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
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View user's profile Send private message
dorT500
Full Throttle
Full Throttle


Joined: Jul 10, 2008
Posts: 3222
Location: Galveston County, Texas

PostPosted: Mon Mar 16, 2015 4:24 pm    Post subject: Reply with quote

Between this ... http://www.saltmine.org.uk/shoeman/cylinders.htm (in case you need to remove just a bit more port metal than one would usually remove in chamfering), a factory service manual with chamfer specs and your trusted two-stroke machinists should get you squared away.
_________________
______________________
______________________________________
GONE.......WITH A PUFF OF SMOKE AND A BLUR OF SPOKE
________________________________________________
:old: https://www.youtube.com/watch?v=C-F3vSrJIUQ
_______________________________________________
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K5
Commuter
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Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Mon Mar 16, 2015 5:33 pm    Post subject: Reply with quote

Thanks again. Good info.
Left the cylinders & pistons with Chris and Tom. Looking forward to what they say.
Hopefully know more later this week.

_________________
-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
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View user's profile Send private message
K5
Commuter
Commuter


Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Wed Mar 18, 2015 5:52 pm    Post subject: Reply with quote

More updates...
Cleaned up and paint the cylinder heads. Will take the flapper wheel and detail the fins later.


Oil pump will get torn down & inspected




New clutch plates will be installed.






Expansion chambers came in Very Happy Very Happy (DG's)

_________________
-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
Back to top
View user's profile Send private message
K5
Commuter
Commuter


Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Fri Mar 20, 2015 5:05 am    Post subject: Reply with quote

Not much to report. Slow day yesterday.

Didn't get to ride the bike very long before buying it, but did notice the clutch grabbed or engaged a bit on the harsh side.

Separated the disc's and found this.


Cleaned up the crankcase a little.


Today... hope to remove, disassemble & cleaned up the master cylinder.

_________________
-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
Back to top
View user's profile Send private message
K5
Commuter
Commuter


Joined: Jan 15, 2012
Posts: 857
Location: Lawton, Michigan

PostPosted: Fri Mar 20, 2015 6:18 pm    Post subject: Reply with quote

At some point the bike took a spill on the right. Fender has a scrape, fork ear is bent (turn signal must have been replaced), and last but not least; the master cylinder has a scape too.



Took the M/C apart. Doesn't look too bad.


Must have been rebuilt at some point. The glob is silicone lube, and lots of it!


Bore cleaned up and looks good. Plugged all the holes, cleaned it in the blasting cabinet, couple of coats of paint and it made a trip in the toaster oven. I'll have more pics later. Still waiting on parts (2 day USPS package, sent out ten days ago?)

_________________
-Ray

Remembering the past... Liv´n the dream

1975 CB750K5 - Restored http://vjmog.com/ftopict-8591.html
1977 GL1000 - Daily Driver http://vjmog.com/ftopict-8883.html
1971 CB175K5 - Restored http://vjmog.com/ftopict-9282.html
1972 - CB350 Rest-Mod-Cafe, current project http://vjmog.com/ftopicp-56578.html#56578
1977 CT70 - Swap Meet Scooter
2004 Rune - Cruiser
1974 RD350 http://www.vjmog.com/ftopict-10725.html
2014 CB1100 http://www.vjmog.com/ftopict-10949.html
2003 HD Road King
Back to top
View user's profile Send private message
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