RySem's Restomod Build

[RySem]

I have officially begun making progress on my restomod build. I am using a 71 CT70H frame as my basis (thank you to VWbusman for the frame!). It was nasty to start out. Had about 7 layers of various spray paint on it...sprayed right over the original decals. Was an original candy blue green bike. Anyways, you can see some before and after pics of the frame. I just bead blasted it today. I will be priming it with etching primer and then painting it with Daytona Yellow single stage urethane. I picked up a set of carbon-look K0 decals and side badges from boosted1 and they look pretty sweet. I will be adapting a YSR50 race front end to the the frame and will be using some sort of standard motorcycle or BMX type bars. For engine I will be using a TRX70 lower end as the base. It will be a 4spd automatic with 12V CDI and some sort of stroker and big bore setup. I have a trailbuddy thumper exhaust on the way courtesy of HymieP (thanks again Jamie!). That is my plan so far. For now here are the frame pics before and after sandblasting.

[makotosun]

Nice to see someone else has a shop as messy as mine!

Keep up the posts and pics!

[bjatwood]

Looks like a good start! Keep up the info and keep the pics coming.

[RySem]

Originally Posted by makotosun

Nice to see someone else has a shop as messy as mine!

Keep up the posts and pics!

You have no idea. There are car parts everywhere. We bought out an old AMC dealership, so half the basement is filled with NOS AMC parts as well as various GM muscle car parts. Aside from that we have: a south bend lathe, bridgeport milling machine, small cnc lathe, 3 stamping presses, a 50 ton hydraulic arbor press, manual arbor presses, sheetmetal shear, pneumatic notcher, sandblast cabinet, pedestal buffer, belt sander, band saw, and the commerical compressor pictured. It gets cluttered pretty quickly. There is just too much going on in this house at one time between car restorations, making the repro AMC parts, and projects like my ct70.

[rfranks]

Off the subject of ct70's. You don't happen to have a 69 AMC AMX ss/c factory drag car by any chance. I had the chance to see one once that was unrestored with 246 miles and the date coded tires still one the car. That thing was beautiful.........................

[RySem]

No SS/AMX but my father does have an original 69 Hurst SC/Rambler (one of 1,512), a 70 AMX (one of 4,116), and a 67 pro street Rambler Rogue 2dr hardtop (also a 72 nova SS with 454 and 4spd and a 68 corvette roadster). I have a 68 Rambler American 2dr sedan with AMC 360, T10 4spd, and ford 8.8 rear with 3.73 posi (work in progress).

[RySem]

New plan! It's funny how things change so quickly. The TRX engine build is out. I just bought a complete XR50 engine. It has never been raced and has very low hours. It has takegawa 88cc bore kit and big valve head with vent kit, tak high volume oil pump, carb, intake, filter (this was all a takegawa kit from two bros. racing supposedly). it also has HD clutch, takegawa hyper CDI, coil, kicker, shifter, peg mount bolts, aftermarket twist throttle and cable. I got all of that for $385 including shipping. I was figuring what it would cost to build up the other engine using a lot of china parts and this seemed like a no-brainer. Anybody want a TRX bottom end?

[RySem]

Got my new front end in today and I'm pretty excited. It is a full race setup from a YSR50 with team calamari springs, ohlins fork oil, new seals, powder coated lower legs, rebuilt caliper and kevlar brake line. The steering stem is too short on the YSR triple so I dug out a K3 frontend I had kicking around and I'll be able to open up the holes a little bit and use those triple trees with no problem. The diameter needs to be opened up an additional .080" to accept the YSR forks. I'll take pics when I get working on that (maybe tomorrow). The challenge will be getting a brake rotor on the CT wheels. I know there are the hubs from disc brake kits like trailbuddy sells, I'll just have to figure out how to get my hands on one. Maybe they'll sell me just that part if I ask nicely.

[racerx]

Upgrading to a real fork & shocks makes a huge difference. You've gone this far down the quality, name-brand-OEM, road - way past cheap & chineezy for this project. If you have the need for a disc brake, go for a real disc brake & hub. Otherwise, the stock Honda hub & drum brake is at least a known quality setup (i.e. quality castings & real alloys) with readily available replacement parts. It is possible to machine a Honda front hub, there's little-to-no cost savings in the end, but you do gain flexibility for a one-off project. Assuming you also got a brake caliper with the fork, your least expensive route to a real disc brake will be to adapt the OEM brake rotor to a CT70 front hub. That'll give you a real OEM disc brake and retain the OE Honda speedo drive at the same time. The limiting factor is going to be inside width between the axle flanges. The original CT70 dimension is really tight and requires a fair bit of machining to get everything to fit & centered. Late model dirt bikes seem to run even narrower fork leg spacing.

[RySem]

I'm looking into all possible options, one of which is making some sort of modification to a stock hub as you said. I have to get the forks setup in the triple tree with the caliper bolted on and stare really hard at it.

--Just looked at the fork stuff again. The length of the YSR forks is pretty much perfect for CT70. It is 1/8" longer, if not less than a CT70K3 fork. The fender mount brackets are a little bit higher up on the ysr forks on account of the 12" wheel but should work just fine with a ct70 low-mount fender (maybe just a slight bit of hole slotting). Just as a comparison for haha's I looked at the triple clamp spacing between the yamaha one and the ct70 one and the ct70 is actually has 1/4" wider stance. So far so good as far as I'm concerned. I'm thinking I may make my own CNCed top clamp. I'll have some photos tomorrow.