Recent Posts

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General Chatter / Re: RK Tek head
« Last post by bitzz on Today at 01:19:58 PM »
Not an RD head, but I had them machine a TZ250 head out to fit on a TZ350 .....
 

Sorry i don't understand
The early (steel framed) TZ250 and 350 used the same heads.
The "later" ones, F or G, had a 'bath tub" head with the plugs at an angle (and they also got 6 transfers) ... which you can get the same effect by redirecting the transfers for a more modern swirl pattern, even on an aircooled RD.

Other than CC'ing the head and setting the squish there isn't much you can do to an air cooled Yamaha 2T head. Heat is the problem and until you address that....
If you go to all the work of CC'ing and setting the squish, get the head Oringed and pinned.
One solution was to install copper inserts into the combustion chamber (the copper conducts heat better) which eliminates hot spots, improving the swirl.
Here's a lousy pic of a RD400 Daytona head that I did
https://imgur.com/uhvfSO9
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Events / Re: OC Vintage Show - Sep 2020
« Last post by SoCal250 on Today at 01:10:06 PM »
Jeez man wish I knew!!

Hey Cameron, long time no talk! Welcome to the site.  :cheers:
The next OC show is Oct 11 (the day after the Hooligan event @ Cook's). Held every 2nd Sunday http://www.vintagebikeoc.com/
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Turning Wrenches / Re: RD400 Left Side Oil Leak
« Last post by paul1478 on Today at 12:40:37 PM »
Not familiar with the 400s but on my R5 I had a leak in the tach seal that drive me nuts for a long time and it would show up on the left quite a bit...
my 400 had the exact same leak. it wound run down through the hold in the top of the cases. never would have guessed that it was a tack cable from where the oil was showing up.
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Turning Wrenches / Re: RD400 Left Side Oil Leak
« Last post by Organicjedi on Today at 12:39:26 PM »
Not familiar with the 400s but on my R5 I had a leak in the tach seal that drive me nuts for a long time and it would show up on the left quite a bit...

I did rebuild the tach drive because it did start leaking. That part is dry now.
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Turning Wrenches / Re: RD400 Left Side Oil Leak
« Last post by Czakky on Today at 10:51:26 AM »
Not familiar with the 400s but on my R5 I had a leak in the tach seal that drive me nuts for a long time and it would show up on the left quite a bit...
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Turning Wrenches / Re: RD400 Left Side Oil Leak
« Last post by quocle603 on Today at 09:28:41 AM »
some people like to spread baby powder to the area to see where it is actually leaking from.
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Turning Wrenches / Re: Fuel tank conundrum
« Last post by 85RZwade on Today at 08:55:14 AM »
I'm looking for a different shape than the original LC tank; looks like I need to get a front wheel under it for a trip to see uncle Dennis!
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Turning Wrenches / Re: RD400 Left Side Oil Leak
« Last post by Arrow on Today at 08:53:10 AM »
Lol, when I posted I could not see the photos.

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Turning Wrenches / Re: RD400 Left Side Oil Leak
« Last post by Arrow on Today at 08:51:09 AM »
Get some white spirit and a paint brush and have a good clean up. Much easier then to see where the source of the leak is.

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10
Turning Wrenches / RD400 Left Side Oil Leak
« Last post by Organicjedi on Today at 08:47:37 AM »
I've been struggling with this left side leak for some time now, really ever since the restore.

Gearbox oil is dripping off of the bottom of the neutral switch. It only appears after I ride. I first swapped the neutral switch o ring and eventually glued it on with high temp silicone. The issue did not go away.

I also hit the sprocket nut with an impact to make sure it was tight and then coated the blanking plugs with ultra black. The leak is still there.

In my mind, this leaves two options. The sprocket seal or the clutch push rod seal. All of the seals are new and the push rod is straight with no grooves.

I'm wondering if there are any tips to test where the leak is coming from or how to stop it.

I'm going to run it with the sprocket on and the side cover off to see if I can spot a leak coming out of the sprocket seal.

I'm for sure going to swap the sprocket seal with a new one and will probably put some ultra black around the sealing surfaces.

It's hard to find an oil trail under here due to all of the flinging oil with the spinning chain. Plus the left bottom side of the neutral switch is the lowest point so the leak could be coming from several places.

I'm bound and determined to find this and seal it up.

Any advice would be appreciated.


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