Wednesday, December 31, 2008
Sunday, December 28, 2008
I was able to build 3 of the 4 frame spars needed to secure the front of the engine. All in all, I was very happy at the "lack of gap" in the second tube on the RHS -- some slow and patient work with the bench grinder resulted in the joint you see at the left. I will have to trim the horizontal tube slightly to allow the radiator hose to clear (a 90 degree bend)... this will be taken care of when the frame is off for final welding.
The rear end shock strut needs to be a bit asymetrical to clear the carb mouth. I was able to scavenge a shock mount from another stalled project. The one side is braced with 5/8" tubing. The other side has a gusset made from 1 1/4" round. My eyeball engineering thinks that this should be plenty strong, as it is holding a shock, and does not have to withstand the stress of a rigid mount. As well, the entire assembly is pretty light.
There is not a pile of clearance under the tank for the oem carb. I'll have to see how well the flatslide fits. Might have to do some more relieving with with underside of the tank to make everything slot in nicely. Will also move the petcock. You can't see it in the photo -- its a typical Japanese two-bolt tap style. It won't be at the lowest point on the tank, and it is not far enough "in front" of the carb to get the fuel to flow poperly. I've got a couple of options up my sleeve.
Wood will be removed prior to finishing.
Now the question remains, what about the paint scheme...?
Rizla MotoGP, or...
2005 Laguna GP?
How about retro 500GP? Typical... frame isn't finished, bodywork isn't here, bike hasn't been run yet, and I'm already thinking about paint. I guess visualization is the key...
Friday, December 26, 2008
This is a kit from an NSR250. Also called an MC28 or MC21, the seller had imported it at tremendous cost to himself, and ended up not using it. This picture of the finished product in Repsol/Rossi colours captured my imagination. Somehow the same shapes with a Rizla paint scheme, or another MotoGP inspired idea seemed pretty cool...
Sunday, December 21, 2008
Tuesday, December 16, 2008
This side view appears to be a study in "mass centralization". The engine, shock and swingarm pivot area are all close to the centre of the bike, fore and aft. It all looks "long"... remember, a SZR660 yamaha engine was originally supposed to inhabit this frame, with a shorter KR1S swingarm. What I have here is a smaller, potentially more powerful, lighter powerplant. Wheelbase is similar to a late 90s 600 -- around 54".
The second-best use of a brass rod -- holding up the Hawk Shock. The shock will be fixed another 3/4 of an inch to the right. It will allow even more clearance to the carb (currently sealed in a plastic bag -- white blob at rear of engine). One more spacer needs to be made to get the engine lined up with the rear sprocket. It's lined up correctly in this photo -- notice alloy angle tool to line up sprockets.
It looks like I'll have acres of room for a radiator and the oil tank for the engine. A LTZ 400 part will flip the water hose on the cylinder head to face the opposite direction. This should allow me to use a stock ATV radiator, not the split rads used on stock DRZs. Less hose, less plumbing, less chance for a vapor lock in the cooling system.
Lots of clearance all around the engine from side to side as well. Nice! Have a pile of 4130 tubing to pick up at Dad's -- enough to build the front engine mount as well as the shock tower. The subframe for the seat will be fabricated out of the 5/8" 4130 I had left over from other projects. Should be plenty strong for even my lardy butt.
Saturday, December 13, 2008
Dave Bennet's Tigcraft. It has a aircooled 600 engine (I think -- I don't see a rad), and an oil cooler up top. My plan to mount the DRZ engine is pretty much identical.
Dave with another version of his bike? Frame looks the same, blue paint with different forks. If it IS Dave, well, thanks Dave! Information is power, and I've got some more information thanks to you. Cheers!
Saturday, December 6, 2008
This is, I promise, the absolute last bit of farting around with the front brakes I will ever do. EBC front wave rotor. FG/Disscaccatti single 6-piston fron caliper. Should stop well... or better than all the other manifestations I have come up with. Actually had to machine the mounting tabs of the front caliper to fit properly. Slid on perfectly.
Sunday, November 30, 2008
As well, I was able to get a neat 6-piston FG front caliper and a set of EBC wave rotors for cheap. The caliper needed a bit of machining to fit the fork properly, and so as I am only running a single front rotor, the other rotor went on to the DRZ -- fit perfectly! Radial caliper, wave rotor -- cool! As soon as the exhaust is fitted, I'll take some more snaps of the Ducati.
The DRZ has been a bit frustrating, as I used a crappy cheap caliper to measure the bore of the engine case -- at 16.4mm -- so I ordered some 16mm drill rod to use as a bolt... and its too small. Bugger -- must be 17mm. I HAD a nice 17mm rear axle from a Ducati that would work perfectly, but sold it on ebay. So there I went again to get a replacement. This means the frame will have to be bored out to 17mm (didn't want to bother with sleeving the engine case), as well as the brass swingarm bushes. Bugger! Waste of money, as the minor trimming needed to go from 15 to 17mm coulda been done the first time. Oh, if I only had a lathe!
Did get the engine in situ in the frame (rough mock-up), and it fits a treat -- lots of room on either side of the frame tubes, and tons of room for a nice radiator and the oil tank. Hooray! Pics to come soon.
Thursday, November 13, 2008
There is, of course, the gaping hole that the original linkage shock passed through. Note that the rod shown will also pass through the rear of the engine case. This got me thinking because if I mount the shock as above, it sits high in the frame -- would like to lower the C of G if possible, and it would be a much "cleaner" solution.
Sunday, November 9, 2008
Sunday, November 2, 2008
I'm also partial to this seat, actually from a Bimota. The built-in fender extension will double nicely as a place to mount a licence plate, and a small rectangular (LED?) tailight will fit just underneath the ductail. I could get a proper seat made, after moulding a base "pan" from this, and benefit from a real cushion for my butt -- rather than a slab of foam. Perhaps it can even curl down over the side of the seat like a real seat pad. Dimensions seem right (supersize the image to see), but this will be something I would have to get in my hands first, prior to building the rear subframe.
Sunday, October 26, 2008
This is a "true" MZ/MuZ tigcraft. Still powered by the same Yamaha 660 engine, but badged as a Muz supermono. Dave built this frame as well -- the stock factory Muz frames had glued lugs around the swingarm pivot point. Steel tubes glued and pinned into alloy extrusions. Saved production time dramatically (I assume). This one has been upgraded with lighter wheels, but I think still runs the KR1S swingarm.