August update
Some of you may have been thinking I've dropped off the edge of the planet. Well, don't worry, I've just been upto a few other things plus a wee holiday abroad.
What's happened to the van since the last update? Nothing really. This update is about another little project I've been wanting to do for a long time but never got around to it for various reasons, but its time has now came. I wanted to just do one post about it so I've waited until it was finished and road legal.
When I was about 14, like a lot of kids I was into riding my BMX and I just heard about 'Beach cruisers' . They are bicycles styled like chopper/bobbers and I really wanted to build one but I never had the skills to do so back then. I did get so far to do a drawing of what I wanted. Which I happen to still have.
I kind of kept coming back to the idea of building one but as I grew older and lazier I thought it would be cool to have an engine in it. I started changing my plans to buying an older moped with pedals and a small 2 stroke engine and modifying that into chopper or bobber. I have even went so far as to going to look at some mopeds but they were either way over priced or missing loads of stuff so I put it all on the back burner.
Fast forward to about 3-4 months ago. I was at my friends garage buying a small hobby compressor off him for my brother. As I was leaving he said "you wouldn't be interested in a Honda CB 125 would you?" I wasn't, but I had a quick look over it anyway. It was a bog standard CB that had been MOT'd the year before but that had ran out. He just lost interest in it and had spent quite a bit on parts, new piston and barrel, new tyres etc..I told him I'd think about it but it wasn't really for me. He even told me he just wanted ยฃ100 to get rid of it, which made me a bit more interested but at the time I had no plans for another project.
A few weeks later, Jana and I went to Ibiza for a little break together. When I was there I just saw lots of small capacity bikes, all different styles and conditions. It started to peak my interest in that bike my friend was selling. Then it started to become my obsession. I looked up all the info on them much to the disdain of my sunbathing darling wife. Then it clicked!, I could use this bike for my foundation of the bobber / chopper I always wanted to build. A quick few txt's later and the bike was mine.
I had decided to make this as low budget as possible so I settled on a bobber style, this meant I didn't need to buy longer forks for a chopper. It had to be a hard tail and kept in an Old skool style. First task was to go pick it up. The day after I got back from holiday I borrowed the work van and collected it then took it back to the garage. Here it is the day I got it, a 1981 Honda CB125T.
Then I started to tear it down.
It came apart really easy, about an hour later I was down to a bar chassis. I then cut the rear sub-frame off.
Stripped it a bit more to leave just the frame then cleaned up left over bits from the sub-frame.
As I was going to hard-tail it I needed to set my fork height first. I wanted the front to sit a bit lower so I took the bolt off the top of the forks, pulled the springs out and cut an inch and a half off to drop it a bit.
I placed a sheet of stirling board on a bench I had to extend it and mocked up the basic lay out of the new hard-tail section. This is the standard wheel base. Oh, I had also went to my other friend who works in a motorbike scrapyard for some bits and bobs. Keen to keep the price down I also took along some of my stuff (tank, rear light/mudguard, lights etc..) to part exchange for some more bobber looking bits. I got a tank off a DT125 Yamaha with a few dents, 4 retro indicators, side stand, chrome headlight, chrome pod gauges and a few other things.
I settled on a 6 inch stretch. I wanted it to be long and low. That's a 5inch bit of box section the frame is on for reference.
I had some copper tubing found outside my garage that someone had dumped so I used that to mock up the frame.
MMhmm, seems uncomfortable enough.
I wasn't too sure how id do the exhaust but I did like the cone shape, I tried it on in its stock position as it was.
Once I was happy with the mock up I started to get serious. Preparing now would save me having to do it all over again so I wanted to get things as accurate as I could. I chalked a line down the board and marked the critical locations.
Tacked the frame to the box
Added a few tabs for adjustment.
Then squared the frame up.
To stop the front wheel from moving I boxed it in.
I cut the swing arm bits out that the wheel bolts to and tidied them up to re-use.
Then I fabbed up a replacement for the rear wheel that I could screw down into place.
Everything all set up its time to start on the rear frame.
I bought a few sections of 1inch thick wall tubing from my work for about ยฃ30 and used my pipe bender to bend it. I know a pipe bender isn't the best thing to use for structural stuff but as all my bends weren't huge angles it didn't kink the tubing at all. I done one side by eye then used that as a template for the other side.
With plenty of tacks in place I took the frame down and bolted the back wheel in to see how it looked.
Then I had to come up with a seat. I made a cardboard template for my butt, cut it out in 3mm plate and curved it slightly. As this was going to be hard tailed I wanted to make it as comfortable for my posterior as I could. My dad gave me a small shock absorber off a mountain bike he had so I welded in another bit of tubing and made a few brackets to join it all together. I used a bolt as a temporary pivot at this stage.
The old tank slipped into place with a little tab but the DT tank never had that so after rinsing the tank out with gallons of water (with a few nuts inside to dislodge any rust inside) I welded 2 M5 bolts to it then made appropriate brackets welded to the frame to hold it in place. The tank never had a fuel tap I could use either so I had to do something with that.
I got a tap of another DT125 but this was a completely different way off fitting to to the tank so I had to modify the tank a bit more.
I had to cut the old tap mount off, plate it, then used a bit of 10mm bar to make a new manifold to bolt the new tap to. It took a while as every time I made a weld I had to fill the tank up with water to make sure it was all fuel tight. Perseverance pays off though.
The tank also uses 2 rubbers at the front which under friction keep the tank in place so I had to weld 2 chunks onto the frame for that. I also found that an old foot pedal rubber was perfect to stop the tank rubbing on the from and keep it at the required height.
The steering lock was jammed so the easiest thing to do was to remove it and fill it with the Mig.
Next up is the foot pegs, I thought of moving them forward, just in front of the engine but as its a twin it never left me much room I stayed closer to the stock location.
I just tacked them into position for now but later made "cups" so they would still fold. The pegs I got from my dad as well.
I had to buy a new chain as the old one was now a tad too short. I also tacked the side stand on, which I also had to shorten by about 3 inch's, don't know what it was off originally.
The position of the exhaust was the next thing to sort out.
I had another length of exhaust with a nice curve in it so I welded that in place then cut the original cone down to a nice stinger style. The chrome on the down pipes was quite tatty plus the new section I welded in was just bare steel so to tidy it all up I ordered some exhaust wrap which arrived later.
My brother was down that day so I wanted to get the engine started and hear what it sounded like, he made a little video of it for me.
https://www.youtube.com/watch?v=PLFy8O4YtaA
It was quite loud so I made little silencer insert that I bolted down inside.
You can also see here that I had also added the 2 small chrome pods to the top of the bars. One of them has the idiot lights in them the other has a bicycle speedo I managed to modify to fit inside.
Oh, I also mounted the rear mudguard. Originally this was off the rear wheel on an older CB125, I pulled it apart and the profile was pretty much perfect for the tyre. Later on I would round off the brackets.
To make a bit more room for ground clearance I modified the rear brake lever.
Which turned out fruitless as it still never gave me the ground clearance I wanted. I then made up my own lever to go above the exhaust, don't have any specific photos of that though, keep an eye out later on for it.
I found an old aluminium fuse box that I was going to use as a battery/cable box but it just wouldn't sit symmetrically, nor would it have been big enough in hindsight. Did look cool though, may use it on something else later. I had to come up with another idea.
I thought id make my own box for all the bits I needed to hide, to begin I welded a floor in. The bike uses 6V electrics so the battery was tiny. The box would have to contain the battery, rectifier, ignition switch and various wires.
A few more measurements and templates I had the basic design of the box sorted.
I also got a phone call from my brother. He had found a pair of carb trumpets he had lying around in his garage and said I could have the, bonus!
Getting closer to the basic design being completed. One of the last things to do was the position of the rear light and indicators all round. I went for the classic bobber style of an off-set rear light to the right hand side. The indicators went where I thought looked cool.
And that was that, a complete mock up done.
Next up was to take it all apart, weld everything up then get it painted. I painted it at my work on a weekend. Going along with the retro them I mixed up 2 different shades of blue to get the colour I wanted. I also wanted it o be a 2 tone so I mixed a bit of white in there too. I never took many photos of this stage, infact only one of the frame before paint.
Once painted it was time to put it back together. I really enjoyed this bit, seeing it all starting to become a proper bike. I also wanted to have white sidewalls for that classic look. I used spray on Plasti-dip for that and they turned out very well. I also made a chain guard form a piece of stainless sheet that was a cooker hood at one point. I also bought a retro Honda decal off Ebay
I took the tank back into work to finish it off with the white and sprayed the rear wheel sidewall. The exhausts got the wrapping treatment. I covered the seat in some foam and vinyl I had lying around from when I done the pedal trike.
I spent the next few days after work sorting out the wiring and cables. I did have an issue with getting the bike to run properly. It seemed like it would only start up one one cylinder then the other would kick in at higher revs. I gave the carbs a good cleans but that didn't really do much. I messed about with the adjustment screws etc.. But still , it wouldn't run right. It wasn't until after checking a few forums about idle issues that I thought maybe the carb is has a leak. So I started the engine, let it warm up then sprayed carb cleaner around the carbs and noticed that the side that wasn't firing right would build up in revs. I took the carb apart from the actual flange on the engine side and noticed that who ever put it together the last time forgot to add an O-ring. One O-ring later and the bike ran sweet as a nut.
And that brings us up neatly to today, MOT day. The first proper test drive on the road was fun, I took it along to the MOT station and he sent me right back to go put a front mudguard on it. Fair enough, luckily the garage was only about a mile away. I put the mudguard back on and it passed first time, no issues! Then I took it for a nice drive around town. The Edinburgh festival is on in full swing right now so I was kinda showing off to all the tourists. I have had a really great day today, so happy the bike is now road legal and I can have fun with it, well, as soon as all this rain stops. Here's a few more pics of the finished bike.
Oh, another little thing. No retro bike would look retro unless the rider was suitably dressed. Old second hand leather jacket and Easy rider style helmet
๐ .