Thursday, February 24, 2011

More Spending

I ordered some stuff for this project.

A CL 70 frame! 



After tons of research and indecision, I chose this frame. It should give me good leg  room, while being short from front to back. It also has good ground clearance for smaller wheels. The CL 70 is also a very light bike; 150 pounds! The C70 and S65 frames look nice, but they have that metal rear fender and thicker middle which I'm sure adds some weight. I could cut those off, but I don't want to ruin anything that someone might have wanted to use in its stock form. Finally, this was the cheapest frame on Ebay at just 50 bucks!

I hope my C70 swing arm works with this frame. I will also be checking if the fork tube from the Z50 will fit. From this chart, it says it will. I also have an option of putting in the ct90 full fork. Lots of options really…


Choosing a fork is very scary. I don't fully understand what these numbers mean. Again, I don't know much about building bikes! I guess if the bikes are in the same lists, then they will interchange, or at least the diameters of the tubes are. 

I also ordered a ct90 head. I thought this would be good for an 85cc upgrade that I'd like to do later. After looking at the kits, they say to use the Z50 head though… maybe it was a waste of money. 

Prices:

CT90 Head :: $24.99
CL70 Frame:: $49.99
Shipping:: $50.00
Total :: - 124.98

Total Expenses so far:

$324.98


Ah, and here is a nice picture of my C70.



Re-Assemble!

After reading the shop manual, I had the idea that I needed flywheel puller to get this engine timed right. Here's the shop manual:


Join this group to download it.

But actually, thanks to "Alex the Man", this engine was designed very nicely so that I need not take off the flywheel. So I will follow this video:


Everything should apply perfectly, I just have a much dirtier engine. I'm sure I will be using many of this videos for this project. I recommend subscribing to his channel. He mentions in one of his comments that the Honda engines have a wasted spark ignition, so it sparks every time at top dead center. That's pretty cool. Makes everything easier to work with.


Ah, I had to make a makeshift gasket for the cam cover; the old one flaked away and would definitely not be holding any oil in. I read somewhere that you could use a cereal box as a gasket...






This might work for testing purposes... But if it holds oil for more than that, I will leave it! And here it is, going back into the cruddy frame. It kinds of makes me feel like it will work... probably not. Oh, and you can see my choices in reading here... not interested in American Labor History though, it was just a textbook for an online summer class that I failed. DON'T TAKE ONLINE CLASSES. They waste your money.


Stupid Disassembly

I took the head off for pretty much no reason. I suppose I wanted to see if the piston was feeling alright, but it was obvious from the start that it was. And it looks good. I cleaned some more things up, but I shouldn't have done this. The cylinder won't come off for some reason. Also, there are some collars on 2 of the 4 head studs. Did I lose the other 2? 






Ah I found out:


I only need 2. Strange. I will reassemble the engine next and build a new wiring harness.

Cleaning Up the Z50

This Z50 is super greasy and muddy. The gastank smells like varnish. Everything will need a good cleaning. I have no power tools so this will all be by hand and brush. 

I have a bucket, a brush, a few rags, Windex, baking soda, and some very weak carb cleaner. These are the results.




The carburetor seems to be clean now and should work. Probably lost a few braincells breathing in that carb cleaner spray...

Starting Point

Starting Point:

I stupidly bought a supremely messed up Honda c70 a while back, thinking I could fix it up. It looked okay, but in reality it was one of the most thoroughly damaged bikes in the universe. A group of karate masters had certainly practiced on this thing and then chucked it into the Sahara desert from a high flying cargo plane. 

But this is what I could salvage:

-Exhaust Pipe (kinda rusty)
-Front fender (cracked but fixable)
-A frozen carburetor
-Intake Tubing
-Front shocks
-Choke and Speedometer cables
-Rear cargo rack
-C70 handlebars 
-Gas tank and seat bracket
-Random nuts and bolts

The frame, trashed engine, fork, and wheels were stolen by the roving Mexican junk collector trucks. The frame and front fork were still good. Damnit!

Most of this will be useless on the new bike, except the exhaust pipe and possibly the shocks and cables. I want to try and use the plastic fender somehow as well. I'm imagining doing a frankenstein fix on it by sewing up the crack by drilling small holes and tying it up with fishing wire, then melting it a bit. Just a theory. 

As I said, I was planning to fix this c70, so I bought some stuff it needed. This stuff is all in good condition:

-Rear swingarm, faded red
-C70 solo seat
-Chain guards 

With both of these boxes of parts, you might get 1/6th of a bike. I was too lazy to sell all of this, so I bought another parts bike.



1973 Honda Z50 in very muddy condition. It had been sitting for 5 years. It was in the Suburbs and cost $200 total for the bike and shipping to my place. It looked like crap, but I'm discovering that it wasn't such a bad deal. 
My first expense for this project. 

- $200

I would say that most of the parts on this bike are usable. The engine is certainly in good shape and seems like it almost wants to start. I can tell by the sound that it's got good compression. I've kicked it over a few times and it sounds like the compression is good, has a nice "plowp-plowp" sort of sound to it, and I can feel puffs of air coming from the exhaust. 
The wiring looks very messed up so I'm assuming it's not getting spark. I'm sure the carburetor is very dirty as well. 

These are the parts I certainly want to keep for the build:

-50cc engine
-Carburetor
-Any random bolts I need

Here are some other parts that MIGHT fit on the new build:

-Front and rear brake hubs
-Front fork triple tree (it seems very sturdy, perhaps I could put in some longer legs?)
-Cute Z50 gas tank, totally rust free

Again, not THAT much stuff I can keep, but just for the engine and some other stuff, it's a pretty good deal. If I were in Thailand, I'm sure I could find a good working 50cc Honda engine for $20, but this is Chicago!

Here is the stuff I will sell for sure. I'll have to check ebay and see what's a good price:

-Z50 Frame and swingarm
-Z50 wheels, both nice and round
-Chain guard
-Rear fender for like $1, it's cracked. 
-Seat is split open but definitely salvageable
-Right handlebar and throttle assembly

If you're on my blog and want to buy any of this, I'll set a good price for you!

So this is the starting point for the project. I basically have an engine, carb, gas tank, and a swingarm. 

Tuesday, February 22, 2011

First Closet Honda Design


This is the hypothetical combination of parts from these bikes to make what I think is a perfect little motorcycle. 

Frame: CL 70 
Fork: CT 90
Swing arm: C 70 
Front Wheel: XL 70 16inch 
Rear Wheel: CT 90 17 inch 
Gas tank: Z50 (if it fits)

I mocked up what it might look like in Adobe Illustrator:

Introduction

Motorcycles are cool. I'm not that experienced, but I've ridden a few different types and developed a taste for bikes with the following characteristics: 

-Light and flickable (250 lbs and less, ideally less than 175 lbs)
-Low to the ground
-Small or thin wheels 
-Lots of vibrations 
-Non-obnoxious exhaust sound
-Simple, rugged engineering
-Low cost maintenance
-Fast is good but not necessary
-Knee-hug-able top tank

I currently ride a 1980 Honda C70 Passport which has nearly all of these characteristics. It's 100% stock and a blast to ride, even if the top speed is only 42 mph. Everything on it works great. 

But I need something to mess with and blow money on. Perhaps I could make this imaginary bike fit ALL of the above characteristics, and maybe look really cool too. 

Design Concept:

Small, horizontal 50cc-110cc engine Honda's seem pretty awesome. From a lot of research, it SEEMS like they have a lot of interchangeable parts between bikes in addition to the engines. This would make it easy to build up a "custom" or "frankenstein" bike by someone like me, who only has a large closet and some hand tools.

There are more than a dozen Honda motorcycles with the horizontal engines. 

Here are all that I can think of at this moment:

Z 50
C 50,70,100
CL 70,90
CT 90, 110
CT 70
ST 90
S 65, 90
SL 70, 90
SS 50
XL 70

It's a pretty diverse bunch. Lots of different frame, wheel, and suspension types. Again, they all SEEM interchangeable. This project will determine if they really are, and help others who want to build frankenstien/parts bin small Honda bikes. From hours of research, a lot of the information is very vague, so hopefully this blog can clarify some things for newbies like myself.