1972 Yamaha R5 350 "A Clockwork Orange" D-U-N Done! Well, at least for now.

Re: 1972 Yamaha R5 350 "A Clockwork Orange"

Wow, no posts here for 2 months! Man.

Issues, specifically clearance issues with the back wheel. As you all know I lowered clearance with a brat style seat by about 2.5" I also put brand new old stock Red wing shocks on her and I noticed that they felt pretty spongy right away. sure enough the back tire hits the seat just bouncing on it. SO, I tried another set of shocks I had laying around and they are slightly stiffer and that does help but it still hits the seat.

So, im looking for ideas in how to gain about two inches. Honestly the rear end feels really spongy so I'm wondering if simply stiffer springs would work. the other thought is to relocate the shock mounts on the down tubes of the frame. This would give clearance and raise the rear end a bit but not going to solve the sponginess.

Thoughts??
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

hey diesel this isn't really related to anything except that i also have an R5 (http://www.dotheton.com/forum/index.php?topic=10140.0) and i was wondering if you know of any larger tanks that work on an R5.

EDIT: also just looked closer at your grips and noticed that you have OURY grips on there, great choice! have those on an 80's 24inch bmx turned fixed gear i have and they are the most comfortable grips I've ever used.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

I don't know for sure what will fit but I'm betting an RD400 tank would work also the early XS tanks might work, they are basically the same shape. and the fram shapes are similar.

I have not put this bike on the road yet but the OURY's come highly recomended. Throw a pic of your R5 up on this thread. I'm planning on having this one finished and enveiled in the next couple of weeks.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

I had a dream last night that I got this thing running. Then I was riding the crap out of it!! Well, actually I did get this thing running about a month ago. Then it started shorting out and blowing main fuses. I think the problem lies with arcing from the point plate to the cover. going to look at that and if that is the problem a little rubberized undercoating on the inside of the cover should do the trick! Might also be in the ignition switch. you have to fiddle with it a bit to get it to stay on. Probably need to pull that apart and look at it.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

As a Kubrick fan, I approve this thread title.

Cool bike, man. Hope you get the Gremlins sorted out.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

I would run a hot wire to the fuse box, then get it running, that way you can rule out the ignition switch.
If it still pops fuses start tracking the short down. If you get board with that put a penny in with the fuse and ride around, and around the block till you see smoke, then stop, and try to figure out what is on fire. This is only helpful to an extent do to the fact that the wiring harness is all bundled together, and the one bad wire will most likely burn up 6 or 10 other good wires. This is not all bad though, because you will have ridden the bike, and now that, you are totally stoked on the project again, you don't really mind having to buy a new wiring harness. ;D
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

Yeah Chris, I used taller shocks from DCC but I just got Hagons for the 360 and might get some for the R5 and use the DCC shocks for something else.

Barnicle - hysterical! No I won't burn my harness out to find the issue. but thanks for the input! I'm pretty sure its a point, point plate or point cover issue. i'm going to have a chance to look into that soon.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

Hmmmm. Never commented in here before. Bikes lookin great Diesel.

But I don't think the points will blow a fuse. Just make the bike not run. Could be wrong though.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

Hmmm, guess your right there. That is actually a good thing.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

I'd check for loose connections in or near the fuseblock and battery. Sounds like arcing, possibly arcing on the frame. If you can get the bike running again check to see if you have continuity ,(current),on the frame. If you do, you shouldn't.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

Alright little update here. This thing has been seriously back burnered lately but I do have some news. Turns out electrical glitch was the ignition switch. I really don't want to pop on $75 for a new one so i'm working out an alternative. With that issue identified I have been able to get her to fire up. Now the issue with piking oil all over the place; turns out there is a little tiny shim on the oil pump accelerator that restricts the amount of oil that is allowed to leave the pump. This was missing. Once I replaced it she fired right up and with out spitting oil everywhere. but then she would quit again. So, I asked the guys at usa2stroker what might be going on and they said that I probably had crap spark if I was running original coils and I had most likely filled the crank with oil which was just continually fouling the plugs. Solution? I ordered new coils from HVC and went and bought a handful of spark plugs. Advice is to gap the plugs real close and get the bike running and lwt it run for about 20 minutes to burn the oil out. seems to be mostly the left had side as that is the pipe that was spitting the most and
when I removed it it dumped about two cups of gas and oil out of it!

Anyway once the coils arrive I'll get this all rectified and this should be my spring rider!!
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

Okay, so it turns out the ebay oil pump I got had the shim on the wrong side of the plate so it was basically wide open all the time. swapped it round and problem solved. I put new coils from HVC in it as well, I got the bike started and idling but only running on right cylinder. ?? Its def getting spark and the plug is absolutely clean when pulled, like new, no gas smell or residue at all. So its not getting fuel on left side. I confirmed that gas is getting to the carb so it must be a plugged up slow jet or something. I'll pull that carb and clean it and see what gives.

out
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

Cool I always liked this build, been wondering how it was going. Hope you have it sorted soon. I am about to get cracking on my first 2 stroke, a DS80 for fun at the cabin.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

I know I started this 2 years ago and have built 3 other bikes in the interim. Problem now is with all that I've learned over the last two years I want to start over! I am going to hang on to this one for a while and make some design changes over time.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange"

Yup, Clogged pilot jet. Running great now!! now I need to sort out the lights. yuck.


 
Re: 1972 Yamaha R5 350 "A Clockwork Orange" She's alive!! (VIDEO)

I just re-read this entire thread. What an odyssey.
 
Re: 1972 Yamaha R5 350 "A Clockwork Orange" She's alive!! (VIDEO)

A couple of teaser pics. Its currently dumping snow and ice on us right now. I'll get her outside asap for better pics. Anyway she's done. well, maybe not done but ready to ride. I want to re-do the seat as it looks pretty hack in person. I also may shorten the rear hoop to allow better clearance for the rear tire which will allow me to shorten the rear shocks an inch. But I'm going to ride her in the meantime.

927b55d6.jpg

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