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Post by billy on Dec 23, 2011 2:56:48 GMT 1
(I edited the thread title as I now decided to build it.  Hello boys (and girls if there are any)! Well you know, it's winter and you get those mad ideas lol.. I have an idea, I want to build an RD125 LC and clean off ALL useless junk off it. This will take 20 goddamn kg's off the bike!  I've actually weighed the stuff. You could slice some more weight off by adding a lighter pipe, making a custom seat, replacing the heavy Mk1 forks/wheels for something lighter, perhaps Mk2 stuff or TZR? And if you want to go all the way for those extra grams of weight saving, you could cut off any unwanted brackets, the steering head lock (in Europe they have a littte lock lump sitting on the left side of the frame) and parts of the sub frame. ANYWAY, I'm seriously thinking about building one from old spareparts. I got a damaged old frame with the engine cases missing that will do fine for a hooligan toy bike. I got an engine, wheels, forks, swinger etc etc. Almost a complete running bike.  About the engine, how much hp's can you get out of it (rear wheel hp's obviously) if you give it a descent tune? I'm not talking a FULL race tune now, the RD engines becomes piston eaters if you go bananas with the intakes, I just want to pop the power up a tad with a pipe, a light port job, (maybe adding boyesen ports) bigger carb etc. Will the bike with it's 20+ kg less weight and that kind of engine tune fly like a rocket, or will I be disappointed after all the work?  |
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davslc
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Post by davslc on Dec 23, 2011 6:38:17 GMT 1
good luck with it mate ,will be interesting to see this project come along , if you need any engine/gearbox bits i have a complete engine in bits minus a crank LOL.
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Post by billy on Dec 23, 2011 9:36:21 GMT 1
good luck with it mate ,will be interesting to see this project come along , if you need any engine/gearbox bits i have a complete engine in bits minus a crank LOL. Thank's mate. And thank's for the offer but I have tons of gearbox parts and what not, but not a spare crank in descent nick. I have to borrow the crank from my other 125 which is in bits atm. |
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Post by Norbo on Dec 23, 2011 14:46:09 GMT 1
I think its worth a go . with the gk removed it will ofcourse be faster you could all so fit i full faring it may add waight but the bike will be faster with a full faring . yopu could look at a TZor RS125 jobe . they are lighter then road farings as well .
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Post by mellow on Dec 23, 2011 15:14:34 GMT 1
or u could just go on a diet ;D
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corf
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Post by corf on Dec 23, 2011 18:26:10 GMT 1
has anyone put a tzr125 into rd125lc frame ?
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chez
Thrash Merchant
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Post by chez on Dec 23, 2011 18:46:28 GMT 1
i have a mk3 crank hanging around
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Post by billy on Dec 24, 2011 6:06:36 GMT 1
or u could just go on a diet ;D Lol, I actually thought about that this morning. I noticed some fat around my arse, it's scary. Soon I'll have love handles like Ardon and what the hell am I going to do with a 125 then lol?!  Naah but seriously, I'm not that heavy, I weigh around 69 kg's. i have a mk3 crank hanging around So do I lol, but it doesn't work with the LC topend.  Hey Norbs, I've been thinking about adding a fairing for less wind resistance, however, I'm not too obsessed with speeds above 130-ish km/h (if so, I could just take the 350 out) but rather good acceleration and a bike that works well for twisty roads. I understand a fairing will help the acceleration slightly aswell though so yeah, it would definitly be a good thing even if I don't go very fast. We'll see what happens, I'll probably be looking at a fairing kit some day. EDIT: I was thinking something like this, but an RD obviously.  |
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Post by mellow on Dec 24, 2011 10:32:12 GMT 1
or u could just go on a diet ;D Lol, I actually thought about that this morning. I noticed some fat around my arse, it's scary. Soon I'll have love handles like Ardon and what the hell am I going to do with a 125 then lol?! Naah but seriously, I'm not that heavy, I weigh around 69 kg's. Try getting to 57 like me and they go pretty well m8 ;D |
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Post by billy on Dec 24, 2011 11:42:10 GMT 1
Try getting to 57 like me and they go pretty well m8 ;D Hahaha yeah that would be something! Too bad I'd probably die from skinnyness if I weighed 57 kg's though. ;D Here's what I've done today anyway, I cut off some unwanted lugs. I'll cut the sidestand and centre stand mounts off aswell. Sidestand mount will be a bit off a PITA to cut off I think, but well worth it once done.  |
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Post by nobrott on Dec 24, 2011 13:06:46 GMT 1
[EDIT: I was thinking something like this, but an RD obviously. Why would you want to build something that ugly? |
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Post by billy on Dec 24, 2011 14:10:00 GMT 1
Why would you want to build something that ugly? First of all, beatu is in the eye of the beholder.  And secondly, I'm not aiming for a bike that LOOKS good, I'm aiming for a bike that weigh very little. You could have actually read that in the beginning of the thread. On topic: I cut off the stand lugs and some more minor stuff. Lucky I took away the entire sidestand lug as it was rusty between the lug and frame tube!  It was mostly just surface rust though and cleaned away nicely. The frame tube was shaped that oddly from factory if you wonder. I think Yamaha "squashed" the tube a tad, probably so it would look better when they added the sheet metal part between the frame tube and sidestand mount?   |
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Post by billy on Dec 26, 2011 9:14:55 GMT 1
I've been playing around in ms.paint and this is how I want the rear to look, but without the side panels (unless I find a crappy pair to modify) and the bike more stipped down:  What'ya think eyy? I won't be dealing with the rear end any time soon though but sometime in the future. |
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davslc
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Post by davslc on Dec 26, 2011 9:52:04 GMT 1
looks pretty good , i have a pair of crappy side panels if you want to px for some decent ones ,obviously i would require cash as well LOL just kidding would pay you LOL
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Post by billy on Dec 26, 2011 11:52:25 GMT 1
looks pretty good , i have a pair of crappy side panels if you want to px for some decent ones ,obviously i would require cash as well LOL just kidding would pay you LOL Hehe, well I don't have a descent pair of spare panels. And I havn't decided wether or not to use side panels yet either, it all depends on how the rear will look. I like that "hollow" look of having f**k all around the rear shock area (like the pic of the red bike above) so I might be aiming for that aswell. We'll see what happens as I go along. |
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Post by billy on Dec 26, 2011 14:09:40 GMT 1
Strenghtened swingarm yes please. I'll probably weld this up in the spring or something like that.  I noticed on dads 125, the bike feels pretty "snakey" in the turns, and I think it is the swingarm causing it. If you take a steady grip around the wheel, you can with fairly little force pry it back/forth diagonally and you see the swingarm bending. I think Yamaha made a design flaw on the 125 swingers (at least the Mk1 afaIk), and I think the added sheet metal will keep it a little steadier. Well, hopefully anyway lol. I might do the same on the other side aswell. |
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davslc
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Post by davslc on Dec 28, 2011 6:41:02 GMT 1
good idea but won't this add the weight you have just removed .
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Post by billy on Dec 28, 2011 9:02:10 GMT 1
good idea but won't this add the weight you have just removed . Well yeah, but it won't make that much difference overall, maybe 1 kg or so at most, but this is very important extra weight that will hopefully make the ride steadier. Edit: Changed my mind, I'm going for this design:  There should be a sheet metal part between the added tubes which will help stability between them, and I can put the CDI on the sheet metal aswell. Two flies in one hit! |
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Post by billy on Dec 28, 2011 16:17:11 GMT 1
I've started building some on the swinger. I had to bend the right side tube as it would have ended up too far to the centre if I had it straight. The left side tube will be straight though as there is more space on the left side of the swinger at the front (and obviously I can't have a tube in the way for the chain : .   |
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Post by billy on Jan 2, 2012 16:28:30 GMT 1
I was looking at an old DT50 yoke I had put i the bin, but then I thought........ why not build clipon bars with it? I like the "tucked in" riding position (especially on a 125 where you NEED to tuck in behind the screen if you want to go "fast") and maybe clipons will make it even better? So, I decided I wanted to try clipon bars on the 125. I have an old bent stock handlebar aswell that I was going to bin, so that bar will be cut up and welded onto the clamps. Luckily the bar is only bent just where it meets the handlebar mount on the stock top yoke.  The clamps will be slimmed down a bit as they are quite thick (7,5 mm at the thickest part). I'm aiming for 5 mm all around, that's still plenty of material but it'll be a little lighter and look better. Also, I will probably drill some holes through the clamps to save some weight, but that's gonna have to wait until I got the bars and reinforcement plates welded onto the clamps. |
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davslc
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Post by davslc on Jan 2, 2012 16:34:27 GMT 1
good idea i like it .
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Post by billy on Jan 15, 2012 12:32:37 GMT 1
Decided to do some work today. It's not much but bloody hell, it's cold as f**k to do anything so I'm pleased with todays work lol. A bit of steering stop repair, not welded yet as you can see. I'll do that in the spring as I have to weld on the outside.  I had this old brake shield which was cracked at the edge and generally in a somewhat poor condition. It's good enough for a racer though. Notice these are two different types of brake shields. The satin coloured one (later model I believe) is actually heavier then the glossy one. The alumnum is thicker on that one compared to the glossy one.  Abra Cadabra, I lightened the b*****d. It's not very nice looking but I'm aiming for kickass weightloss of the bike rather then looks, and this part became quite alot lighter without weakening it too much.    I'll probably lighten the brake shoes aswell, even though you can't get much weight off them. |
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Post by billy on Jan 16, 2012 8:37:12 GMT 1
Did some polishing on it, but it became crap as the polishing disc is all crappy nowadays. I'll probably paint the bugger black later. Anyway, here's what it looks like on the rim: (click the pic if you want to.  |
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Post by scott on Jan 16, 2012 22:12:16 GMT 1
EDIT: I was thinking something like this, but an RD obviously. i like this billy,go for it m8.i would rather see something different for a change m8. |
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davslc
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Post by davslc on Jan 16, 2012 22:23:19 GMT 1
so what front end you going for ,stock lc or something special ?
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Post by billy on Jan 17, 2012 10:16:15 GMT 1
Scott; yeah I'd like something different, especially something simple with no "useless" parts on it. so what front end you going for ,stock lc or something special ? ATM it's leaning towards stock but you never know what idea pops up. I do have an idea actually but I'm not sure if I can be arsed to do it, I guess it depends on my building mood.
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Post by Norbo on Jan 17, 2012 10:31:34 GMT 1
I must admit thats the first time i have seen that brake plate mod on a bike befor . even ona race bike no one has done this as far as i know .
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Post by seezyer on Jan 17, 2012 13:31:03 GMT 1
has anyone put a tzr125 into rd125lc frame ? i helped a mate do this conversion on an RD in about 1992, i seem to remember it had "Samson stage 3" etched into the barrel, and didnt really fit well (one cross member cut out and a bit of the TZR casing had to be cut away) but the thing FLEW! i think he ran all of the RD electrics (not sure though as i wasnt around when he did that bit. it did blow up a lot though..... |
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davslc
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Post by davslc on Jan 17, 2012 16:50:11 GMT 1
its a yz125 engine you want in it if it can be done those things did fly , my mate fitted a 80cc crosser engine in his er50 when he was 17 and couldnt keep the front wheel down LOL.
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Post by billy on Jan 18, 2012 6:37:54 GMT 1
I must admit thats the first time i have seen that brake plate mod on a bike befor . even ona race bike no one has done this as far as i know . Hehe, naah it isn't the most popular mod I reckon, and I wouldn't recommend it either (especially not for a road bike) as there is a small risk of getting stones into the drum. I'm taking that risk though lol. its a yz125 engine you want in it if it can be done those things did fly , my mate fitted a 80cc crosser engine in his er50 when he was 17 and couldnt keep the front wheel down LOL. YZ 125 sure has alot more power then an RD engine so that would make a fun ride, but the problem is - which YZ engine will fit good enough?  |
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I've actually weighed the stuff. 
Naah but seriously, I'm not that heavy, I weigh around 69 kg's. 
And secondly, I'm not aiming for a bike that LOOKS good, I'm aiming for a bike that weigh very little. You could have actually read that in the beginning of the thread. 
