Recent Posts

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2
Haus of Projects / Re: RD Monoshock ninja susp. swap
« Last post by 85RZwade on Today at 11:23:11 PM »
Sounds like your next build will be under "4-stroke blasphemy"
3
Turning Wrenches / Re: RD400 race tires
« Last post by triple1972 on Today at 11:22:53 PM »
Rick F is going to give it a go this year and is helping me out get started! Will look into the Conti’s. Thanks Chuck.
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Turning Wrenches / Re: RD400 race tires
« Last post by SUPERTUNE on Today at 11:15:55 PM »
You did have to ask while I was at the AHRMA vintage races this weekend at Roebling Road Raceway!
If on close to stock rim sizes go with the Conti 3's
100/90 front and 110/80 on the rear. The supplier Eric is in Daytona, Fl.
Not cheap, but so is rebuilding your race bike again after to didn't have a good race tire!! :eek:
Chuck
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General Chatter / Re: where do these washers go?
« Last post by SUPERTUNE on Today at 11:09:40 PM »
400 specific question, since i'm not super familiar with them compared to 350s. is it normal to have 2 washers on the kicker shaft?


RD350's use a single shim washer.
I do think the all of the 400's used the twin concave shims and the 400F went to a plastic bushing on the shaft.
Chuck
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General Chatter / Re: RZ
« Last post by SUPERTUNE on Today at 11:03:07 PM »
Keith is a fantastic bike builder...I did the top end and setup on the RD350 and RD400 he did that were a work of art when they were done.
Chuck
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Turning Wrenches / Re: RD400 race tires
« Last post by triple1972 on Today at 10:45:20 PM »
First season of racing so I don’t have any fellow racers to ask but I will check with Lyn.
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Turning Wrenches / 75 hp RD 400
« Last post by 2strokesforever on Today at 10:45:08 PM »
So i was out cruising the web and happened upon a " looking for the best pipes for my RD400" Thread.

Not going to mention any names here, but there is a certain cat out there claiming that his pipes will push 75 hp out of an RD 400 with 34mm carbs and porting, which he stated the porting changes some power output but his pipes make the biggest improvement-bar none.

Have I missed something? :umm:

Im not on here as much as i was in past years do to a shift in hobbies, buildings and having kids, but what the hell.

I know Chuck was making some pretty sick power out of his 400, but I just dont recall exactly how much. And if anybody is going to make big power it would be chuck.

Just the fact that the guy claimed his pipes made up the biggest difference and the porting was minor has me really second guessing things?

Just wanted to check in and see if there is any truth to this.

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Turning Wrenches / Re: RD400 Ignition Timing (stock points)
« Last post by SoCal250 on Today at 10:28:22 PM »
Stock timing is;
73-75 RD350               2.0mm BTDC
76-78 RD400 (US)       2.3mm BTDC  (+/- 0.15mm)
79 RD400 (US) 2V0     2.4mm BTDC  (+/- 0.15mm)
79 RD400 (CAN) 3J7    2.0mm BTDC
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Turning Wrenches / Re: RD400 Ignition Timing (stock points)
« Last post by Dvsrd on Today at 10:07:49 PM »
Stock timing is 2.0mm BTDC
  #1 Run good fuel
       100ll ave gas 60/40 NO ethanol pump 92

Retard = 1.9- 1.8 mm BTDC

 Use good fuel and 2.0mm for round town fun. Long high speed runs 1.8mm

JT
2.00 mm BTDC is stock for the 350, I thought the 400 had more like 2.30 mm, due to its longer stroke. That said, 2.00 may well be a good compromise for a 400, running low octane gas.
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