ADVrider

Go Back   ADVrider > Bikes > Old's Cool
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-12-2007, 08:31 PM   #1
metlcutr55 OP
LongGoneDaddy
 
metlcutr55's Avatar
 
Joined: Dec 2004
Location: s w NH
Oddometer: 885
77 yam rd400 your thoughts?

looking for opinions...i have a line on a bike i really like the looks of....1977 yam rd400 c with chrome chambers...dont know why i want it but i really do...got rid of an h2 few years ago, lot more fun to look at than ride, i should know better. its at a 2nd hand dealer, says 3700 mi, fresh top end (why i dunno guessing it sat maybe), pics look real good, stock except for the pipes. havent seen it in person but in headed soon. $2k. im all ears...
metlcutr55 is offline   Reply With Quote
Old 01-12-2007, 08:50 PM   #2
El Hombre
Banned
 
Joined: Jul 2006
Location: Alta Coma, California
Oddometer: 1,536
Crank seals were always suspect on those. You get to split the cases. Usually, you find about it when it seizes. Good reason why it's got a new top end.

Then get the Kmart coils, or equivalent, to fix the plug fouling. Don't know how to do that? Dig up the 32 year old Cycle Magazine issue about it.

Yamaha's suck, big time. Go get another Kaw.

Blue turds.

Rant off.
El Hombre is offline   Reply With Quote
Old 01-12-2007, 10:00 PM   #3
metlcutr55 OP
LongGoneDaddy
 
metlcutr55's Avatar
 
Joined: Dec 2004
Location: s w NH
Oddometer: 885
no more kaw triples for me...always outta sync, wont stop or go around a corner....i wonder if fresh top end just means rings and pistons...i know its one of the least collectible but she keeps calling my name...bringg..ding..ding..ding...
metlcutr55 is offline   Reply With Quote
Old 01-13-2007, 05:23 AM   #4
no5s
Terror at 2 mph
 
no5s's Avatar
 
Joined: Oct 2004
Location: Oceanside
Oddometer: 335
Rd

One of my favorite bikes. Way aread of it's time. Brakes and suspension good. Best wheelie machine ever. Self cancelling turn signals. Buy it, fix it, ride it.
__________________
12 Super Tenere
84 R80 ST
64 R50/2
65 Triumph TR6 Desert Sled
65 Triumph T100SC TT Bike
no5s is offline   Reply With Quote
Old 01-13-2007, 07:06 AM   #5
dan-c
Back
 
dan-c's Avatar
 
Joined: Aug 2005
Location: SATX
Oddometer: 13,571
Crank seals. Usually you can tell they're leaking if it somkes like hell. They suck the transmission oil intot he rank case. IMO, I don't think the old Yamahas crank seals degrade as bad as Suzukis or Kawasakis.
Fresh top end. If the guy took care of the bike, it may have only needed rings or he could have had it bored and fresh pistons and rings. Big deal, that's easy stuff on a two-stroke . The pulg fouling on the RD's was pretty much cleared up after the - model. Get iridium pulgs and throw in there. Only use Yamalube S2. Shouldn't be an issue.
That bike looks nice, but 2 large is a premium for the bike.
dan-c is offline   Reply With Quote
Old 01-13-2007, 07:34 AM   #6
farmer fred
Banned
 
Joined: Aug 2006
Oddometer: 1,493
I'd take an RD over a Kawasaki triple any day, if you are going to ride it. I am having a crank rebuilt for my 79 Daytona as I type this.

The trouble with chambers is who jetted it? Stock is usually best.

The price seems a bit high. Look around at http://www.usa2strokers.com/forum/default.asp for advice/ideas/sources.

farmer fred screwed with this post 01-14-2007 at 10:06 AM
farmer fred is offline   Reply With Quote
Old 01-13-2007, 10:47 AM   #7
Motomech
Adventurer in Latin Amer.
 
Joined: Dec 2005
Location: Playas del Cocos, Costa Rica
Oddometer: 337
I owned, raced and worked on RD's for ten years, so I will try and clear up some myths here.

First off, unless it was stored in a enviormently controled storage area, the crank seals will have likely dried out. It won't be a problem at first, but, as mentioned, the trannie oil will likely start to be pulled into the crankcase, resulting in copious smoking. If it was stored in a humid place, the brg.s may have become rust pitted and the same thing will happen(the brg.s will develop play and hog out the seals, which will in turn start to leak). If I had to guess, I would say that these prob.s would start to develop around 10,000 miles for the RD we are talking about. Yes, the cases need to be split to replace the main brg.s and seals, but the crank would not have to be rebuilt, as I think the center brg. and labrynth seal would be ok and the crank would still be in true. Stock and mild RDs avg. 20K on main brg.s and 40K on cranks. Cranks for twins, unlike tripples, do not need a jig to rebuild, so it's not hard to find someone to do that. Crank brg. play is ck.ed by feeling for movement at the rotor. If any is felt, it's time.

Unlike the 350's(which I perfered), the 400's do not respond well to partial mod.s. They perfer to be stock or wild. In the case of the RD in question, I would leave the pipes on and retain the stock airbox(important). That way, all it would need is to go up one or two sizes on the main jets, if that had not already been done.. I would add Boost Bottles and leave it at that.

It's totally false that RD's need the big, silly looking aftermarket coils to keep from fouling spark plugs. What they do need is;
1]to be mechanicaly sound
2]have the Autolube Injection pump properly adjusted(this is done removing shims on the plunger until the proper amont of stroke is attained, I would take it down to just a few thousands of an inch).
3]Feed a quality two stroke oil, I perfered Bel-ray SI-7.
4]To have quality contact breaker asm.'s intalled and properly timed. By quality points sets, I mean Yamaha, if still available and ND if they are not. Timing is set with a dial guage and a spark plug boss adapter. Breakers need to be adjusted every 10K and replaced at 20K. Use only the stock NGK plugs, B8HS, i think.

The DS7, R5 and RD line of bikes were the first good handling and stearing bikes to come out of Japan, way better than the Kawasaki tripples. The 350's are akind to riding a rail as far as comfort went and Yamaha softened the 400's to the point that the '78 400 was like riding a beach ball. It's easy enough to cut down the seat and if you get this bike, you will want to get aftermarket shocks.
As with all bikes that have sat, you want to take a good look inside the fuel tank. If it's not clean and shinny, you will be in for lot's of extra work(assuming the carb.s will be totally gunked-up as well0.

Yes, RD's are maintainence intensive, but they are rewarding bikes, even today.
__________________
Motomech "One modification a day"
'92 BMW R100GS Bumblebee
'91 Suzuki TS 200R
'96 KTM 300EXC
Playas del Locos


"The BMW Airheads, riding yesterday's technology the day after tomorrow".

Motomech screwed with this post 01-13-2007 at 11:17 AM
Motomech is offline   Reply With Quote
Old 01-13-2007, 11:58 AM   #8
Mattbastard
Lazy ass
 
Mattbastard's Avatar
 
Joined: Mar 2005
Location: Sheboygan
Oddometer: 1,998
I like my car coils.


Mattbastard is offline   Reply With Quote
Old 01-13-2007, 12:02 PM   #9
Motomech
Adventurer in Latin Amer.
 
Joined: Dec 2005
Location: Playas del Cocos, Costa Rica
Oddometer: 337
Quote:
Originally Posted by Mattbastard
I like my car coils.


Yeah, weee bad!
Looks like a nice 350. I was sooo queer for RD350's in the late '70's. Did every trick in the book and then some.
Is that a trails tire on the frt.?
__________________
Motomech "One modification a day"
'92 BMW R100GS Bumblebee
'91 Suzuki TS 200R
'96 KTM 300EXC
Playas del Locos


"The BMW Airheads, riding yesterday's technology the day after tomorrow".
Motomech is offline   Reply With Quote
Old 01-14-2007, 11:38 AM   #10
Mattbastard
Lazy ass
 
Mattbastard's Avatar
 
Joined: Mar 2005
Location: Sheboygan
Oddometer: 1,998
Nah, I forget what they are, but I got em from HVCcycle with a bunch of other shit for my smoker.

That bike's a hoot. It flat out rips twisties like nothin' else I've owned, including an R1. I dont know why this is, but it's just more fun. I've always heard that it's more fun to ride a slow bike fast than a fast bike fast. Not that my RD350 is slow, but topping out at only 110 makes it slow by todays comparison. It's definetly a labor of love too. I bought it for the completely overpriced value of $600, and put a bit more than that back into it, not to mention over about 200 hours of labor total. Complete engine tear down, new gaskets/seals/cables/paint/etc.. Then there was the learning curve for tuning This definetly gave me a new perspective on tuning carbs.

The bike has definetly grown on me. I may never sell it, not because i'd never get out of it what I've put in, but because of it's character. You dont hear piped smokers on the road anymore. One time last summer I was pulling up to a job (electrician) and got to BS'in with the homeowner for the better part of an hour over the damn thing. He said he hadn't heard that sound in over 20 years. That's what I like about it, it's more original than a harley now a days.
Mattbastard is offline   Reply With Quote
Old 01-14-2007, 11:46 AM   #11
markjenn
Beastly Adventurer
 
Joined: Nov 2003
Location: Swellvue, WA
Oddometer: 10,345
Quote:
Originally Posted by Mattbastard
I like my car coils.


Looks great for cooling the coils. The engine doesn't fare so well.

- Mark
markjenn is offline   Reply With Quote
Old 01-15-2007, 06:52 AM   #12
SteveBroskey
Teach me this knowledge
 
SteveBroskey's Avatar
 
Joined: May 2006
Location: Rochester, NY
Oddometer: 541
Rd

Buddy's told me to keep an eye out for an RD 400 for him since I bought my DT last year. I don't know a thing about them but he told me he'd come from TX to NY to pick it up if I could find one - so he's smitten...
SteveBroskey is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 11:11 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014