Author Topic: 1973 RD350  (Read 9567 times)

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Offline Scott S

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Re: 1973 RD350
« Reply #25 on: April 09, 2016, 05:49:41 AM »
 My Super at work has two RZ's that he bought new. One is a Kenny Roberts edition and the other has chambers, carbs , etc. I could probably buy one of them from him.
'71 CB500 K0
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Offline grcamna2

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Re: 1973 RD350
« Reply #26 on: April 09, 2016, 07:13:50 AM »
That 73' RD350A you have there is in such beautiful original condition that you could sell it and get enough $ to buy one of his RZ's  ;)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

ken65

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Re: 1973 RD350
« Reply #27 on: April 09, 2016, 04:26:13 PM »
Thanks Mr grgamma2. I'm in Australia and am seriously considering selling my bonneville

to buy an early air cooled 350 like Scott S's bike.

ken

Offline grcamna2

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Re: 1973 RD350
« Reply #28 on: April 09, 2016, 05:32:12 PM »
That 73' RD350A you have there is in such beautiful original condition that you could sell it and get enough $ to buy one of his RZ's  ;)

When I see the RZ350 and the LC they make me think of a more modern version of the later TZ350 race/track bike  ;)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Stev-o

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Re: 1973 RD350
« Reply #29 on: April 09, 2016, 05:33:58 PM »
Thanks Mr grgamma2. I'm in Australia and am seriously considering selling my bonneville

to buy an early air cooled 350 like Scott S's bike.

ken

Hey Ken.....I suggest you ride one, if possible, before you buy one. 
As much as I like mine, I find myself only taking it for short rides around the 'hood for an hour max or so.  It's rather small and lightweight, not ideal for a highway cruiser. 
However, it is fast and nimble, a blast to ride!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Retro Rocket

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Re: 1973 RD350
« Reply #30 on: April 09, 2016, 05:42:24 PM »
Thanks Mr grgamma2. I'm in Australia and am seriously considering selling my bonneville

to buy an early air cooled 350 like Scott S's bike.

ken

Hey Ken.....I suggest you ride one, if possible, before you buy one. 
As much as I like mine, I find myself only taking it for short rides around the 'hood for an hour max or so.  It's rather small and lightweight, not ideal for a highway cruiser. 
However, it is fast and nimble, a blast to ride!

Steve, Look at Kens sig mate, I doubt he would buy a RD for a highway bike when he owns an FJ1200 and an R1 Yammy   :P ;) Plenty of places to ride a nimble little "chook chaser" here mate...... ;)
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Offline Scott S

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Re: 1973 RD350
« Reply #31 on: April 15, 2016, 05:33:23 AM »
(WARNING: Long post ahead...)
  Getting familiar with the new to me '73 RD350. It's my first 2 stroke and the manual just showed up yesterday. When I first got the bike, the gas was OLD. After getting some fresh non-ethanol and running that through the carbs, the bike ran better.

 I would sometimes experience a bog at high RPM if I stayed in the throttle. What I mean by that is, it seems to bog sometimes around 6-7K RPM....but  only after I've wound it out in the gear before. In other words, if I roll onto it in 1st, 2nd or 3rd, it'll do OK, but when I grab the next gear and keep the RPM's high, there's a bog or a stumble before it recovers. Does OK in lower RPM's and does OK as long as I'm not wailing on it. The more I've ridden it, the less it does it.
 It has a stock air box with a K&N filter and no lid. Another oddity I noticed is that when I put a bag of tools in the holder (burlap bag about the size of a Crown Royal bag), that partially covered the air filter opening and I swear it's running better and doing it even less. Not sure if it's just fresh gas cleaning out the system or if maybe it was a tad too lean up top without the lid?

 Anyway, on to the points....
 I have a manual and a dial gauge now. I also watched a timing with a dial gauge video last night. I haven't done anything other than poke around and get familiar with the system. The points gaps both measured OK. A loose .011", snug at .012" and I kinda had to force the .013" feeler gauge in there.
 But I did notice that the front or LH points plate is maxed out. (Forgive me if I'm using the wrong terms. LH as I'm sitting there looking at them...which cylinder is this set for?)  I can also see witness marks where it used to be centered in the plate.



 RH or rear points are centered in the plate.



 And the pair.



 Only after seeing the timing video and taking some sandpaper to the rust was I able to find the timing marks. These are the two marks I'll be looking for, correct? The line on the housing and the notch on the rotor?



 Now....all that said....if I put the dial gauge on it and find that the LH points are off, is it as simple as loosening the two outer screws and moving the plate? And then loosening the third, smaller screw on the points themselves and adjusting to get the ~.012" again?
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline grcamna2

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Re: 1973 RD350
« Reply #32 on: April 15, 2016, 06:42:34 AM »
Scott,
I recommend that you remove that entire stator windings(I've never seen one look so rusty,they're usually nice and shiny factory zinc plated) that covers your brushes,etc. and get the outer part lightly sandblasted to remove all that corrosion(the points and brushes can't properly 'ground' and will give you a weak spark)and then polish the outer surface and coat it w/ a protective film.Replace your points,a Fresh pr. of condensers and finally clean your carbs.The points fiber blocks are wore down and they won't be able to advance much further.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline MoMo

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Re: 1973 RD350
« Reply #33 on: April 15, 2016, 04:52:55 PM »
Left points are for the left cylinder...IIRC points should open 1.8mm BTDC. I never used the timing marks only a dial indicator and ohmmeter to determine when points open in relation to TDC.   Good suggestion in the previous post

Offline grcamna2

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Re: 1973 RD350
« Reply #34 on: April 15, 2016, 05:08:18 PM »
Try to find oem Yamaha points if at all possible
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.