Author Topic: 1971 R5 repairs  (Read 918 times)

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Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #15 on: October 13, 2021, 05:11:16 PM »
The airbox is getting some attention. There are a lot of little nooks and crannies to sand. The two little foam pads I’m thinking can be copied out of a roll of foam pipe wrap [ Attachment Invalid Or Does Not Exist ] [ Attachment Invalid Or Does Not Exist ]
 

Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #16 on: November 11, 2021, 01:22:43 AM »
A lot of little things getting done, as it sits last week 101281-0
 I’ve got some other Yamahas here so they have been giving up some small items like reflectors, clutch levers , bolts etc101281-1 Not parts bikes. Just borrowing.
 

Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #17 on: November 11, 2021, 01:26:09 AM »
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Offline robrd

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Re: 1971 R5 repairs
« Reply #18 on: November 11, 2021, 09:49:56 AM »
Hi Dave, it's looking good, not too much left to do now. Your very lucky to have other bikes that you can borrow from, are they your next projects? only problem is, all the parts you borrow will have to be replaced one day to make them complete again. I'm looking forward to see the motor fitted, that is when you can see the end in sight and stand back and admire all of your hard work, Well done.

Offline Captain Scarlet

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Re: 1971 R5 repairs
« Reply #19 on: November 11, 2021, 03:45:56 PM »
Got to love a R5. ;)
Nice job !

Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #20 on: November 12, 2021, 03:05:14 AM »
 Well they are future projects hopefully, sometimes it’s a desperate grab of what is needed and let tomorrow’s Dave deal with it. Totally enthralled with this R5 like the other night cleaning electric connectors then just sat down to look at it for a while. They made a beautiful motorcycle!
 Originally the engine was going to be sent out to have a professional go through it. I pulled off the top end and was surprised to find what appears to be stock pistons that fit tight in the bores. 14,000 miles on it so ??? Perhaps clean up and run as is ? Wish I’d started and drove it some upon101285-0101285-1 first purchase to see how it shifted etc. Picture of top of piston attached.
 I’d asked the long time owner of it if he’d done repairs himself and he said no, always had a Yamaha dealership do anything needed.
   

Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #21 on: November 12, 2021, 03:12:20 AM »
I’ll get a feeler gauge in between piston skirt and cylinder and report the clearance, seems like a honeymoon fit as my dad used to say.
 Everything being done in wrong stages here, after removing top end now cleaning cases and risking grit getting into lower end. 101287-0 white paper towels to check for contamination

Offline 5port

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Re: 1971 R5 repairs
« Reply #22 on: November 12, 2021, 09:04:08 AM »
Well they are future projects hopefully, sometimes it’s a desperate grab of what is needed and let tomorrow’s Dave deal with it. Totally enthralled with this R5 like the other night cleaning electric connectors then just sat down to look at it for a while. They made a beautiful motorcycle!
 Originally the engine was going to be sent out to have a professional go through it. I pulled off the top end and was surprised to find what appears to be stock pistons that fit tight in the bores. 14,000 miles on it so ??? Perhaps clean up and run as is ? Wish I’d started and drove it some upon (Attachment Link) (Attachment Link) first purchase to see how it shifted etc. Picture of top of piston attached.
 I’d asked the long time owner of it if he’d done repairs himself and he said no, always had a Yamaha dealership do anything needed.
 

Yes, those are standard size pistons markings.  The engine condition with 14,000 miles can be anything from very good to bad, it just depends on the treatment it has had.  I have a couple of original, un opened RD250/350 engines that are still good with 15,000 odd miles.  You have to make the choice of trying it or rebuild.  Certainly, you can test for a lot of things.  The manuals give all the specs for the cylinder bores, pistons, rings and the rod deflections.  Unfortunately, it is not really possible to accurately test the rest of the crank or seals so, you have to judge those.  One thing that the manuals only cover for "new" condition is the piston skirt/bore clearance.  You measure front to rear with a feeler about 10mm up from the bottom of the liner with the piston in the bore.  The new clearance is given in the manuals but, it is approx 1.5 thou inch in new condition.  2 thou inch is used, over 2.5 thou inch is worn.  All these details for Yamaha parts.
Of course, if you try it and it works well, great!  However, if it is not good enough, you haven't really lost anything, it will just need the rebuild!

Cheers

5port
5port

Offline robrd

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Re: 1971 R5 repairs
« Reply #23 on: November 12, 2021, 10:16:03 AM »
Totally agree with 5port, the long hard slog is getting everything else done, in your case to a high standard, to sit your motor in, if you need to remove the motor again, which I doubt by what you have said, it's a very simple job, you have done all of the hard work. As for the rite order? I don't think there is one, If your happy the way your doing it, carry on, it's the end result that matters and I don't think anyone can pick fault with what you have achieved. Keep it up!

Online Gr8uncleal

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Re: 1971 R5 repairs
« Reply #24 on: November 12, 2021, 11:14:01 AM »
I’ll get a feeler gauge in between piston skirt and cylinder and report the clearance, seems like a honeymoon fit as my dad used to say.
 Everything being done in wrong stages here, after removing top end now cleaning cases and risking grit getting into lower end. (Attachment Link) white paper towels to check for contamination

Your dad should also have told you not to "honeymoon" on a beach!!  :o :o :o :D :D :D
Yam RD200DX
Yam FZX700 Fazer
Yam RD400C
Yam RD350B
Yam RT2
Yam DT360A
Suzi GT550J
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Yam RD125A
Yam RD250E
Yam DT3
Yam CT1C
Yam RD200B

Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #25 on: November 23, 2021, 11:59:00 PM »
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 I’ve been working on engine , stripped it down as far as I’d dared to go then delivered to the fellow who will take it from there. Endless cleaning & painting going on.

Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #26 on: November 24, 2021, 12:03:56 AM »
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I sand and then polish the unpainted sections on cases and fins, tape them off and spray VHT gloss black over it then remove tape and clean up with a sharp blade
« Last Edit: November 24, 2021, 12:08:26 AM by DaveHunter »

Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #27 on: November 30, 2021, 02:10:49 PM »
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 For 40+ years this awful sissy bar has been attached. It had rusted until it was brown & was one of the first things to be removed.
 Well looking at it discarded under the bench all this time & having second thoughts. Research showed little about it. One similar to it with OK chrome & low price was on eBay so I bought it.

Offline DaveHunter

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Re: 1971 R5 repairs
« Reply #28 on: November 30, 2021, 02:18:41 PM »
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 At a swap meet last summer picked up a 1971 Yamaha accessory book and a model lineup brochure that are interesting to look through.

Offline robrd

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Re: 1971 R5 repairs
« Reply #29 on: November 30, 2021, 04:11:48 PM »
The books are a very good accompaniment but I'm unsure about the sissy bar, Then again, it's your bike so do what you want, at the end of the day it's you that's got to get on to the bike with that bar in the way? just my opinion, what's the bike looking like now?