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RD400 Turns 50!

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Messages - 1976RD400C

#1
Quote from: IR8D8R on January 22, 2026, 02:12:38 PMThe tariff guy just ordered 10% on European imports, effective immediately. I guess not just EU because England quit the EU. ...Rising periodically until they surrender Greenland. I think it goes to 25% in 3 months? Then 50%... Order your parts from EU and UK now while it's only 10%.

IR8D8R

Tariff guy canceled the tariff last night.
#2
General Chatter / Re: Plastic Mikuni main jets?
January 22, 2026, 03:10:02 PM
I have some of those that are 40 years old. The holes seem to be what they say they are compared to brass Mikuni. There's a bit of nervousness when tightening them.
#3
Turning Wrenches / Re: Need a carb
January 22, 2026, 10:46:39 AM
Did you check that the choke plunger is sealing ok?
#4
The way the batteries are mounted is kind of sketchy. You can't get it out without lifting the gas tank. The positive post is so close to the tank that if the battery holding strap breaks it could slide over and hit. You can't get to the positive post, to charge it, unless you lift the tank and support it. I connect the charger to the main fuse under the seat.
#5
Turning Wrenches / Re: Need a carb
January 21, 2026, 08:44:49 AM
Do you see anything with body of that left carb that looks suspicious?
#6
oem spacer is 2 3/16"
#7
15 3/8"
#8
Turning Wrenches / Re: Radiator Upgrade RZ421
January 15, 2026, 04:03:15 PM
Next up, the stuck in traffic temperature rise??
#9
Turning Wrenches / Re: RD high compression?
January 07, 2026, 04:37:56 PM
Did you happen to pour some oil in there before the spark plugs and trying to kick it?
#10
General Chatter / Re: Great website?
January 02, 2026, 07:52:30 PM
Along the top of the page it says 70% off and free shipping on orders over $60 ?????? :pop:
#12
Turning Wrenches / Re: YPVS Loses Position(?)
December 23, 2025, 09:39:33 AM
For some reason these bikes are really tricky to get running just right once the original pipes and air box come off.  :bang:
#13
Turning Wrenches / Re: Crank seal question/ RD400 Daytona
December 22, 2025, 03:00:48 PM
Outside of seals, facing the rotor and clutch
#14
Turning Wrenches / Re: YPVS Loses Position(?)
December 22, 2025, 09:31:43 AM
This is how I fixed my RZ stock carbs. It's kind of astonishing how they transform how it runs. I have them on my 34mm RD400 carbs also. I was skeptical at first but found out, wow. 
https://www.economycycle.com/product/ufo-ultimate-flow-optimizer-for-rds-and-rzs/
#15
Turning Wrenches / Re: R5 -RD350 conversion
December 21, 2025, 01:06:18 PM
Wossner makes R5 pistons up to +2mm.