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Author Topic: RD400 - Back from the Dead  (Read 10003 times)

Offline 3DogNate

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Re: RD400 - Back from the Dead
« Reply #130 on: Oct 20, 2017, 23:20:48 »
Looking great... nothing like the smell of 2 stroke oil.

Offline stroker crazy

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Re: RD400 - Back from the Dead
« Reply #131 on: Oct 21, 2017, 01:03:34 »
“Ride like the Wind” W.H.

Offline goldy

  • Posts: 375
Re: RD400 - Back from the Dead
« Reply #132 on: Oct 21, 2017, 08:09:15 »
I've been smoked out a few times myself...fun ain't it! :)
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 #133 on: Oct 25, 2017, 09:39:35 »
Ran into another odd-ball issue.

It fired up and ran great about 4 times in a row... then on the 5th time (this is after significant cool-down between start-ups). It would backfire. I had the tank on "RES".

I went chasing electrical thinking it was the points, maybe a bad switch, but no... everything was working perfect. Big, fat purple spark on both plugs in both boots... so not the coils.

I decided to pull the fuel hoses and check the petcock for flow.

On RES, I had barely a trickle out of the outlet going to the LH carb... the RH carb was fine.
On ON, I had full flow.

I looked in the tank and the fuel level was about an inch below the "ON" pickup. WTF?

I took the bowl off the petcock and a bunch of sediment was in there. Which is odd, because I soaked the tank in vinegar for 3 days in all different positions and rinsed it out VERY well with distilled water and baking soda, then again with some 2-stroke gas.

There may be some cancer inside the tank I can't see that's causing this.

ANYHOO... cleaned the petcock, added fresh gas, then it fired right up and I took it for a ride... all was normal.

Looks like some Kreem is in my future, but for the time being a couple of 90-Micron screen filters and an extra tank flush will have to do.

This was the result of 2 cups of fuel run through the petcock. I poured most of the fuel off... but there's a good amount of jet-clogging junk here.


Offline stroker crazy

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Re: RD400 - Back from the Dead
« Reply #134 on: Oct 25, 2017, 09:50:34 »
Looks like some Kreem is in my future …

Looks nasty!

(Caswell works well)

Crazy
“Ride like the Wind” W.H.

Offline jpmobius

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Re: RD400 - Back from the Dead
« Reply #135 on: Oct 25, 2017, 12:04:56 »
Remove your petcock and make sure the screen over the reserve inlet is ok.  Then make sure the screen that covers the sediment bowl is ok.  You shouldn't need anything but these two screens.  Take off the sediment bowl regularly and check for contaminants.  After you run through a few tankfuls things should be fine.  Don't use any sealer on your tank unless it leaks!!!  Especially kreme, which is the worst thing you can do to a tank.
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline goldy

  • Posts: 375
Re: RD400 - Back from the Dead
« Reply #136 on: Oct 26, 2017, 08:22:52 »
I'll second that..DON"T use Kreem! There is always some corrosion sediment/ flaking after you clean a tank, it will flush itself out over time. If you MUST line it, use something like Caswell or POR 15.
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 #137 on: Oct 27, 2017, 14:25:03 »
After a flush the sediment is gone... i wont Kreem... but i did find a pinhole leak by the air box on the left hand side on the bottom of the tank... i think it can be welded.  ::)

Found my screen in the petcock was backwards so on was res and vicea-verse...

Lastly, i was still getting bad backfires so I threw in new points and plugs.

She runs better than ever now! Timing set at 1.95mm and both cylinders read 205 degrees after blasting around the neighborhood a bit.

NOW i have enough confidence to break this thing in out on the road...

Offline goldy

  • Posts: 375
Re: RD400 - Back from the Dead
« Reply #138 on: Oct 27, 2017, 19:49:37 »
I suggest you try solder rather than weld on that pinhole...a bit of acid flux and a good hot soldering iron. No flames, no boom! :D
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 #139 on: Oct 31, 2017, 10:27:18 »
I agree. This winter I'm going to chem strip the tank, glass blast any rust pits, and then do a pressure test to see where she's leaking... I'll rinse with alcohol and air-purge before hitting it with the iron.