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Author Topic: RD400 - Back from the Dead  (Read 10005 times)

Offline AimlessMoto

  • Posts: 156
  • Blood, sweat and beers.
Re: RD400 - Back from the Dead
« Reply #120 on: Oct 09, 2017, 14:32:14 »
Bit more digging, found my air/fuel screw O-rings were completely shot... got some new ones on the way.

Also got my cylinders back from the machine shop... they look amazing. Pics to come.

Offline AimlessMoto

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Re: RD400 - Back from the Dead
« Reply #121 on: Oct 16, 2017, 09:44:36 »
Top-end came back from Supertune1. Amazing quality of work. Jugs and pistons installed no problem. Chuck had mentioned he noticed a lot of grit in the cylinders, I thought it was from the honing blocks I used, but upon closer inspection there was SAND in my air box...

I completely disassembled the air box, washed it out with dish soap and simple green, and hit it with a scrub brush. No more sand. Really concerning... Hopefully it was just something I missed during the first go-around.

I was able to get the engine back together, checked and re-checked the float height on the carbs, re-synced and re-cleaned... I'm just waiting on new air-screw o-rigs... should've been here Saturday, but looks like Monday/Tuesday now. They're literally the only thing I need to kick it over and start break-in.

Here's some pics of the progress.


Offline AimlessMoto

  • Posts: 156
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Re: RD400 - Back from the Dead
« Reply #122 on: Oct 16, 2017, 09:48:06 »
Glamour shots with the new mirrors...

Offline AimlessMoto

  • Posts: 156
  • Blood, sweat and beers.
Re: RD400 - Back from the Dead
« Reply #123 on: Oct 16, 2017, 09:57:47 »
I also re-set the timing to 1.85mm btdc, and re-bled the oil lines.

Offline SONIC.

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Re: RD400 - Back from the Dead
« Reply #124 on: Oct 16, 2017, 10:00:41 »
soooooo....
how does it ride?

Offline AimlessMoto

  • Posts: 156
  • Blood, sweat and beers.
Re: RD400 - Back from the Dead
« Reply #125 on: Oct 16, 2017, 11:12:41 »
Waiting for the O-rings for the idle air screws... then I'll fire it up.

Offline goldy

  • Posts: 375
Re: RD400 - Back from the Dead
« Reply #126 on: Oct 16, 2017, 14:58:33 »
Glad you have it back together. Sand eh?...bad news for any engine, but especially a two stroke...I hope it didn't get into the main or con rod bearings.  :o
1948 Norton ES2
1954 AJS 20B (project)
1956 Triumph TRW
1968 Triumph T100 special
1969 Norton Commando
1973 XL350 special

Offline AimlessMoto

  • Posts: 156
  • Blood, sweat and beers.
Re: RD400 - Back from the Dead
« Reply #127 on: Oct 16, 2017, 15:10:24 »
I washed out the crank case about 5 times with mineral spirits, then a little ATF, then more mineral spirits... each time the spirits came out more and more clear. I would spin the crank with a drill on the stator side with cardboard taped around the cylinder studs and rubber bands through the wrist pin holes to suspend them in the center of the 'bore'.

There is zero gritty feeling on the crank. I think if anything made it into the crank case of the 15-20 mintues this bike ran it either blew straight out the exhaust, or was in the base of the crank case.

I went through after with a can of brake clean and the air compressor. Then quickly hit everything with some dino 2-stroke oil.

Offline clem

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Re: RD400 - Back from the Dead
« Reply #128 on: Oct 16, 2017, 21:33:11 »
Chuck is one of d'best around.

Sent from my SAMSUNG-SM-G930A using DO THE TON mobile app

"After every war there are soldiers who refuse to surrender. To this day there are still thousands who cling to their 30+ year old motorcycles, thinking that the war is still on, refusing to concede that the four-strokes have won"

1972 DS7 http://www.dotheton.com/forum/index.php?topic=45886.msg505995#msg505995
1983 CB550sc bobber http://www.dotheton.com/forum/index.php?topic=30599.30

Offline AimlessMoto

  • Posts: 156
  • Blood, sweat and beers.
Re: RD400 - Back from the Dead
« Reply #129 on: Oct 20, 2017, 22:54:57 »
Screws came with the right o-rings... she fired on the 1st kick and smoked me out. SUCCESS!


She runs like a sewing machine! Warmed it up, rode it for 5 mins, let it cool down.

Going to check the head bolts and start the break in process. Shes PEPPY!