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Author Topic: RD400 - Back from the Dead  (Read 9950 times)

Offline Maritime

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Re: RD400 - Back from the Dead
« Reply #40 on: Jun 09, 2017, 13:46:33 »
Too long and they can get damaged from the acid in the juice but I suspect that would be if you left them overnight. I used regular pinesol on the Virago carbs and just put a sander on the container and let it run an hour, rinsed em, blew compressed air through all the openings and they were clean as a whistle. I put all the brass in a little container with carb cleaner and ductaped that to the sander shook that for an hour and again came out clean as a whistle.  The little container was glass and I could see the dirt coming out of the jets etc. was pretty neat. I did the same on 2 other small engine carbs for a tiller and mower and worked great as well.
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CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
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Offline AimlessMoto

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Re: RD400 - Back from the Dead
« Reply #41 on: Jun 09, 2017, 14:28:47 »
Great build diary, will keep an eye on this.

What's the process with boiling gunked up carbs in lemon juice, are there any don'ts when doing this? Time/temperature etc?


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50/50 lemon juice and water. Get it boiling. Dunk in the carb for about 20 mins. Remove and soak in soapy water (dawn dish soap).

Blow it out with compressed air. Any remaining gunk can be cleaned out with carb cleaner.

Offline Bubba1982

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Re: RD400 - Back from the Dead
« Reply #42 on: Jun 09, 2017, 15:44:15 »
50/50 lemon juice and water. Get it boiling. Dunk in the carb for about 20 mins. Remove and soak in soapy water (dawn dish soap).

Blow it out with compressed air. Any remaining gunk can be cleaned out with carb cleaner.

Great thanks, will give this a try!! Got a really caked up carb off my SR250 that needs a deep clean.


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Offline AimlessMoto

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Re: RD400 - Back from the Dead
« Reply #43 on: Jun 09, 2017, 15:47:46 »
The ProX pistons came in! Quickly unwrapped and began the process of de-tanging. Came out alright... really have to clean my files now... lol.

All boxed up ready for the machine shop... hope they can get the gap to .0014-.0016"...

Offline CrabsAndCylinders

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Re: RD400 - Back from the Dead
« Reply #44 on: Jun 09, 2017, 19:30:28 »
Too long and they can get damaged from the acid in the juice but I suspect that would be if you left them overnight. I used regular pinesol on the Virago carbs and just put a sander on the container and let it run an hour, rinsed em, blew compressed air through all the openings and they were clean as a whistle. I put all the brass in a little container with carb cleaner and ductaped that to the sander shook that for an hour and again came out clean as a whistle.  The little container was glass and I could see the dirt coming out of the jets etc. was pretty neat. I did the same on 2 other small engine carbs for a tiller and mower and worked great as well.

I'm going to try that sander trick!
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Offline AimlessMoto

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Re: RD400 - Back from the Dead
« Reply #45 on: Jun 09, 2017, 21:54:42 »
I'm going to try that sander trick!

Sounds like Ichiban Moto foolery to me... lol.

Offline farmer92

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Re: RD400 - Back from the Dead
« Reply #46 on: Jun 10, 2017, 00:08:28 »
Those pistons look real good there man,
And +1 for the pine sol bath, just not in the house unless you like the scent haha



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Offline AimlessMoto

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Re: RD400 - Back from the Dead
« Reply #47 on: Jun 10, 2017, 22:46:28 »
Was able to cut and file the new YZ85 reeds to fit the cages. Metal ones were slightly bent and probably original..  The fiber should last longer and if they fail sbouldnt grenade the new top end. Also, de-carboned the heads and gave them a polish. Nothing fancy, just enough to hinder carbon buildup for a while 

Offline jpmobius

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Re: RD400 - Back from the Dead
« Reply #48 on: Jun 11, 2017, 12:36:53 »
Be sure to flatten out the sealing surface.  Sheet of #400 or #600 wet or dry sandpaper (wet) on a piece of glass works great.  Mark with machinists blue or a sharpie, and lightly grind with a figure 8 motion until the marks disappear.  I glue my head gaskets with copper coat.  Don't over torque, and re-torque after the first two heat cycles!!
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 AimlessMoto

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Re: RD400 - Back from the Dead
« Reply #49 on: Jun 11, 2017, 15:15:06 »
Do you use the copper coat with or in place of the actual gasket?