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Cobrahead

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Discussion starter · #1 ·
I am currently restoring a 1983 Z50R that I learned to ride on. For this project I am going as original as possible. After rounding up parts and doing research for that project I totally want to build something tricked out.

What model Z50Rs are similar to my '83 model? It looks like the '79 thru '87 are all pretty similar. Are there any years to 'look out for' ...for good or bad reasons? Do they make more aftermarket parts for some years than others in the '79 - '87 range?

Thanks
 
Keep in mind that the '79-'81 model years were short-rod engines and will take a different aftermarket big bore kit than the '82-'87 models, which are long-rod engines. The main difference is the deck height between the pistons.
 
Discussion starter · #5 ·
Keep in mind that the '79-'81 model years were short-rod engines and will take a different aftermarket big bore kit than the '82-'87 models, which are long-rod engines. The main difference is the deck height between the pistons.
That is very useful information. Is there an advantage to the long-rod engines vs short?
 
The only advantage that I can think of would be the ability to take a complete XR/CRF50 or 70 top end (cylinder, piston/rings, and complete head with a roller bearing cam) and bolt it right up to the '82-'87 lower end, but all of the above parts have to be used to make the swap.
 
Discussion starter · #7 ·
The only advantage that I can think of would be the ability to take a complete XR/CRF50 or 70 top end (cylinder, piston/rings, and complete head with a roller bearing cam) and bolt it right up to the '82-'87 lower end, but all of the above parts have to be used to make the swap.
Ok, I appreciate the pointers. Is there any difference in the frames? Could I take a 1979 frame and put an entire engine from an 85 on it? (just an example)
 
basicly that whole year range is for all intents exactly the same...heck even the 90s ones were the same just with different body and a few changed mount points...again going older its the same thing all the same but the tank/seat mounts change..bonus to the older stuff is big drum..bonus to the newwer stuff 12v with CDI ...no points
 
Discussion starter · #11 ·
basicly that whole year range is for all intents exactly the same...heck even the 90s ones were the same just with different body and a few changed mount points...again going older its the same thing all the same but the tank/seat mounts change..bonus to the older stuff is big drum..bonus to the newwer stuff 12v with CDI ...no points
That's interesting. I am sure this has been discussed, but how much trouble is it to add a new 12V with CDI motor to an old frame. For example: Let's say I bought a '79 frame and wanted to add a '97 stock motor? Or would it be easier to take a '97 frame/motor and add an metal gas tank from the early '80s? ...I am going for the retro look, but completely modified.
 
Very easy conversion to do, installing the 12V CDI-type engine in the older frame. You just have to hide the CDI box and use a 12V ignition coil with a long plug wire, like the 6V coil has. Below is a pic of my '83 with a 108 stroker 4-speed and CT70 wheels.



EDIT: I used an XR50 12V coil mounted to the airbox mount tab under the frame

 
Discussion starter · #13 ·
Very easy conversion to do, installing the 12V CDI-type engine in the older frame. You just have to hide the CDI box and use a 12V ignition coil with a long plug wire, like the 6V coil has. Below is a pic of my '83 with a 108 stroker 4-speed and CT70 wheels.

View attachment 178521

EDIT: I used an XR50 12V coil mounted to the airbox mount tab under the frame

View attachment 178529
That's freakin' cool! Do you have a thread showing the build?

Did you modify a Honda stock engine or is the entire engine aftermarket? The modified suspension and larger tires is something I want to do, but have not even started researching yet.
 
I used an '00 XR50 engine, and the TrailBikes 51mm stroker, TB 88cc kit, a Chinese E22 head, an '84 ATC70 4-speed, and the TB Shengway 20mm carb. The front forks have the XR/CRF50 +1 fork legs and HD springs, the swingarm is from an early 80's XR80, and the rear shocks are 330mm long.
 
Discussion starter · #15 ·
I used an '00 XR50 engine, and the TrailBikes 51mm stroker, TB 88cc kit, a Chinese E22 head, an '84 ATC70 4-speed, and the TB Shengway 20mm carb. The front forks have the XR/CRF50 +1 fork legs and HD springs, the swingarm is from an early 80's XR80, and the rear shocks are 330mm long.
Which model front fork +1 kit did you use?
 
Here are some additional differences I didn't see mentioned above....

1979 Z50's had actual bar clamps. The bars can be tilted forward and backwards, which cannot be done on the other Z50R's because the "bar mounts" are tack welded onto the bars so it is fixed in place at a specific angle. If you don't keep the stock bars on a z50r (besides the '79) , you can replace them with with 7/8 bar mounts, or find something that works. I did this on my 83 Z50 to give me the ability to run the Pro Taper Mini Racer Bars without spending the money on the bar mount kits. I believe the bar mounts I used were off of an XL70, snagged em on ebay for about 15 bucks and they polished up really nicely.

As Dirtbkr188 told me, The bars on the '79-'99 Z50R models are 7/8". The bar clamps used on the '79 are also used on the XR/CRF70 models from '97-'12, as seen here.

Another thing is the '79 did not have a number plate on the (right) exhaust side. I modded my 83 instead of my 79 for that reason specifically....I wanted to use number plates on both sides and that was important enough to me to be what led me to my decision. Not a hard thing to add, and you may be replacing the exhaust anyways, but that's just a minor little difference that actually did influence me in my decision sense my 79 and 83 were both in similar condition.

Like mentioned, different colors etc....Only real differences were decals, rim color, # plate and fender colors, and frame was white instead of red in 87. You can always find aftermarket seats, repop seats, or seat covers, plastic fenders in various colors, repro tanks, and so on...not a huge deal.

If you really do end up going crazy modding it, and you have motor mods/aftermarket motor, aftermarket forks, extended swingarm, rims, etc....The only thing that will matter at that point is the frame honestly! Haha! If you aren't planning on repainting the tank or frame, they did switch from Tahitian Red to Blaze Red in '82...(big whoop ;)) And like mentioned previously, The frames and motors will pretty much all go together besides the short rod and long rod stuff. In the long run that's not too important, you can easily find parts for both motors. Sky is the limit on craziness, I'm doing a totally custom CT70 build at the moment with frame mods, and all sorts of craziness that has never been done before (that I know of....and if it has, I guess I'm not the only idiot in this world!! :D) I've already invested over a grand into the frame, and motor. Not hard to have fun and get "a bit carried away" as my friends might say.

My advice is to try to go into it with a plan. I used to spend countless hours just looking through EVERY SINGLE PICTURE in the z50 or ct70 pictures threads. It'll give you a lot of ideas, you'll see parts you thought you wanted on someones bike and decide against it and see how bikes look with different suspension, wheel and swingarm set ups that you may like or want, etc. If you have a general idea of what you want, it'll make it much easier. You will change your mind many times along the way I'm sure, but at least having some sort of direction helps a lot.

I like to make an Excel spreadsheet and total up my investment in parts including shipping to know exactly what I have in each bike. (Custom build or not) That way if you do have a budget, it's harder to get carried away and if/when you decide to sell it, you have a better idea of what to ask or at least know what you have in it. I will say, after you pour your heart and soul into reviving a mini and making it customized to your own liking....you won't want to sell it. It's addicting...BRB, gotta go pick up another z50. I've been needing to take another hit. ;)

Aaron
 
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