Speed rebuild for mike

[Enginedoctor]

i already completed this project, but figured I'd post it up. I didn't really have time to take detailed pics, and usually I forget somewhere between the first few and last few bolts anyways..

So a friend of mine happens to be a painter at a body shop, and he's helped me out with some stuff in the past. ALSO this bike and I have some history. Back when I was 15 and had a z50 a friend of mine told me he also had a Honda mini bike, his one being a ct70. He brought it to me in non running condition, at which time I re ringed it, and did a valve job, along with the always important carb rebuild... we rode it for years, and it eventually got used and abused, both by us as well as the people it was "lent" to...
In fact here's a picture of a photo of me riding it at 15...

Anyways mike had bought this from future Olympian Jon c for $350. Here's what it looks like on arrival:

Not bad really I had already removed the muffler). Especially for the "friend" deal he got at 3.5 beans. Immediately yanked the engine guard, foot pegs, chain, and engine. Here's how dirty 15 years of neglect made things:

So, mike began to strip the frame, and in the meantime I split the wheels, and tore down the engine.. I was excited to see how resourceful I had been back in 2000 or whenever I had rehabbed this bike initially... LOOK at the RTV between the wheel halves! Made their current removal a piece of cake.

 

[Enginedoctor]

I hit my ten picture limit.... heres the other wheel half, as well as the original head and cylinder, which looked pretty good considering...

So apparently I gave Jon my z50 engine (which was a 70 at the time) since that was when I put the atc110 in the z50 chassis anyways. So the motor goes in the heated caustic wash...

Mike whipped the sticker off the original frame. It never ceases to amaze me in how beautiful the original paint is on these bikes, and the damage 50 years of occasional tanning really does.

So heres where the pictures dry up. Just one is worth a thousand words, so I'll try to keep it brief.
I did some work for a guy and he gave me a "junk" z50 engine with a broken case. Luckily, it had a TB 52mm piston, a 12v style (roller cam) head, a good starter shaft, manual clutch, and 3 speed crf style trans. I told mike I had this stuff, and he had asked me about the displacement on my existing bike. He wondered how I got to the 110cc displacement I had, and I explained the crank had to be replaced. So, he spring for a 3 speed style tb 51mm stroker, a complete big bore gasket set, high volume oil pump, and a knock off 20mm carb. I had to clearance the cylinder bore (which I wasn't pumped on) in the cases to make the 52mm cylinder fit.
I built the bottom end real fast and heres the results:

I like how the later style starter gear engages the transmission a little better, as well as the ratchet style engagement of the shaft....
Anyways give the cylinder a quick squirt:

Scrape off the excess, while mike was baking the last shot of "metal grey" (aka sort-of cloud silver)

And the one day turnaround engine looks like this:

Picture limit reached: see below

 

[Enginedoctor]

So, mike is simultaneously busy, having had the frame blasted, and fixing some of the dents in his tins... he still needs a set of k1 fork ears (bueller?...) he did a headlight bucket trim black (still wet in this photo) which happens to be redundant from above, assuming you clicked the thumbnail...

He did some bodywork, including cleaning up some pits on the swing arm, using glaze and some 320.

Before applying the metal grey, I took the flywheel cover and polished the center section. Here's the result:

So, we start blasting the frame with sealer, then gold base. He did some tins for Dustin too:

Then, of course, the ruby red:

Not bad for a quick blast....

 

[Enginedoctor]

Incidentals included a new 420 chain, decal kit (of course) some hardware store bolts, a reproduction wiring harness, battery, headlight, two tubes, and some other things I'm sure I'm forgetting. Here's the stages of the assembly;

To finish, he applied the sticker (crooked) while I wasn't there, for which I gave him an appropriate amount of grief. In reality only a $20 mistake...

Maybe 3 days total, if you don't count the week the sandblaster took....

https://instagram.com/p/Bc5eW75H2VE/

Hardest part in my opinion is both the availability of the booth (advantage us) and knowing what you'll need before you begin. Happy trails to all....

 

[mikejana]

Outstanding!

 

[cjpayne]

Way to go ED!!! Thats gonna look great.

 

[tcislander]

Great photo detail and summary of a project from start to finish. Well done!

 

[Cleato904]

Great work on the pictures and your restoration, posts like this will definitely get the fire going for those who want to start or finish a restoration