Yamaha RD350LC restoration.

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Ben
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Re: Yamaha RD350LC restoration.

#31 Post by Ben » Thu Apr 23, 2020 8:20 am

Top work, Tipper! What a great way to spend time in forced isolation.

Project bikes should be commanding a premium on eBay!

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mangocrazy
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Re: Yamaha RD350LC restoration.

#32 Post by mangocrazy » Sat May 16, 2020 5:40 pm

I think the lockdown has warped some people's estimation of how much 'project' (i.e. incomplete basket cases) bikes are worth...

Anyway, the lockdown has kinda forced me to get stuck in with rebuilding my 350LC motor. You may remember at the beginning of the year it was in this state:
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Since then (and thankfully prior to lockdown) I've stripped the motor to its component parts, got the crankcases and crankase covers vapour blasted and the crankcase covers powder coated, had the crank completely refurbished and balanced and had the barrels rebored and acquired new (Japanese) pistons and rings. The barrels still need some external work doing to them (more on this in a few days, hopefully) but I'm happy to report that the bottom end is now back together.

Proof:
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The oil pump is scheduled to be sent off in 3 or 4 weeks time for a complete overhaul, and I'm currently stripping the fork legs with a view to removing the powder coat on the fork bottoms and returning them to standard (bare aluminium, but protected with wax). I've also got a bunch of old fasteners in various stages of rusting away that will get the citric acid treatment then be sent for olive drab passivate (the original dark green finish that Yamaha used).

I'm desperately trying not to over-restore it or get carried away, but I know what I'm like...

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Falcopops
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Re: Yamaha RD350LC restoration.

#33 Post by Falcopops » Sun May 17, 2020 2:26 pm

very very nice mate, excellent work

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Re: Yamaha RD350LC restoration.

#34 Post by fatboy » Sun May 17, 2020 2:31 pm

Wow ! Very impressive before and after images.
Apart from the homemade rod protection and bearing retainers that looks like it could be on a factory work bench
Cleverly disguised as an adult !

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Re: Yamaha RD350LC restoration.

#35 Post by mangocrazy » Sun May 17, 2020 10:29 pm

I'm just wondering whether I should trim down the surplus gasket paper on the clutch side. The flash has really accentuated it...

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Re: Yamaha RD350LC restoration.

#36 Post by Falcopops » Mon May 18, 2020 6:10 pm

mangocrazy wrote:
Sun May 17, 2020 10:29 pm
I'm just wondering whether I should trim down the surplus gasket paper on the clutch side. The flash has really accentuated it...
and chance damaging the new paint/powdercoat!

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Re: Yamaha RD350LC restoration.

#37 Post by mangocrazy » Mon May 18, 2020 8:41 pm

Wise words. I think I'll leave well alone... :smt004

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Re: Yamaha RD350LC restoration.

#38 Post by Ben » Tue May 19, 2020 9:53 am

mangocrazy wrote:
Mon Mar 09, 2020 11:36 pm
Thanks Bobbi! :smt004 Bike manufacturers don't make 'pretty' bikes any more. They're all angry, angular Terminator-styled things or galumphing great adventure bikes with ridiculous amounts of panniers, headlights and bash plates. Or sad, dull utilitarian things.

Ho hum. Must be getting old...
Just seen this. I totally agree but would add in 'Japanese' to that statement. All modern Japanese bikes seem to be super-angular and in your face. There European manufacturers aren't immune but there are not a lot of subtle bikes coming out of Japan.

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Re: Yamaha RD350LC restoration.

#39 Post by mangocrazy » Sat May 30, 2020 9:47 pm

The restoration thing has expanded from the original 'fix the motor ' brief and now includes 'sort the suspension'. Consequently I've ordered up a YSS shock, YSS forksprings and YSS front fork cartridge emulators. I do remember the suspension as being particularly iffy back in the 80s and I can't believe it will have improved in the intervening years...

So the fork are now in pieces awaiting their new internals and I've shipped the fork lowers off to have the black powder coating I had done in the 80s stripped off and then vapour blasted. This is a photo of one fork leg as it came back from the vapour blasters and the other after it had been scotchbrited and wax polished:
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I've also started to get the top end (barrels, head) ready for paint. The head just needed vapor blasting and masking, the barrels will need some serious de-grease and clean up. Here's the cylinder head fresh from the vapour blasters and masked up ready for paint.

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Gio
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Re: Yamaha RD350LC restoration.

#40 Post by Gio » Sun May 31, 2020 8:14 pm

Where dem pics mate
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Re: Yamaha RD350LC restoration.

#41 Post by mangocrazy » Sun May 31, 2020 8:44 pm

Seems to be a bit of a problem. Not sure if it's just me or forum-wide. Can't seem to upload pics.

<Update> Looks like we'd hit some predefined limit on storage for images. I've raised it by 20% and it seems like we're OK now.

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Re: Yamaha RD350LC restoration.

#42 Post by Gio » Thu Jun 04, 2020 8:24 pm

mangocrazy wrote:
Sun May 31, 2020 8:44 pm
Seems to be a bit of a problem. Not sure if it's just me or forum-wide. Can't seem to upload pics.

<Update> Looks like we'd hit some predefined limit on storage for images. I've raised it by 20% and it seems like we're OK now.
Someones got deep pockets!
I hate it when people ask if you have a bathroom, I want to say "No we pee in the garden"

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