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This blog is chronological description of my 78 CB750 chopper project which I began in April 05. SOHC (Single Over Head Cam) CB750 motors were produced by Honda from 1969-1978.
Thursday, August 11, 2005
Day 131
Wanted to get a quick update in before the weekend sneaks up on me. Got my parents in town and I'm going down to Florida for a little R/R this weekend. So here is where we are. Spent all day last Saturday getting the frame and oil tank primed up:
http://pg.photos.yahoo.com/ph/marklocklear/detail?.dir=8c67&.dnm=c289.jpg&.src=ph
...this is with the etching primer on it...I put a coat of El Cheapo flat black on it just so it looks a little better. I also did a quick mock up:
http://pg.photos.yahoo.com/ph/marklocklear/detail?.dir=8c67&.dnm=5679.jpg&.src=ph
...I know...looks pretty crappy, but you get the idea. The lines are what I wanted. With the forks slid down in the triple trees I figure I need about 6 over forks. I have a lead on a set from a guy off Hondachop, so we'll see if that pans out.
As far as the neck goes I think I solved my problem. If you recall the diameter of the neck was to large for the dust cover. So I used my angle grinder to take about 1/8 of an inch off the top of the neck...heres a pic:
http://pg.photos.yahoo.com/ph/marklocklear/detail?.dir=8c67&.dnm=b149.jpg&.src=ph
I was pretty proud of myself with this. The dust cover fits nice and slug over the neck now. I ordered a set of aftermarket sealed bearings for the neck. Hopfully they will be here today or tomorrow. I'm hoping they come today, I'd like to bolt it up tonight and see how it fits. Just checked ups.com and they left Illinois yesterday at 2pm...so I'll keep my fingers crossed.
So the rear wheel situation is pretty dyer. If you recall problem #1 was my axle did not fit the holes in the frame. Well the problem there was the axle holes are 3/4 inch, and the stock Honda axle is 22mm (or was it 20?). At any rate the axle is slightly larger than 3/4". The was a pretty easy fix. About 20min of grinding with my Dremel fixed the frame right up and I was able to get the axle through. So now I can bolt up my stock CB750K wheel. Well, with it all bolted up the wheel is off center by about an inch! In the immortal words of Goose to Maverick in Top Gun, "This is not good Mav!" Turns out the stock Honda hub is just to wide for frame. A fellow chopperhead on Hondachop has a cycleone frame, and he went throught the same thing. He says he has rear wheel from a CM400 that he is using that fits like a glove. So I'm working on two fronts now. One if I can find a CM400 wheel, the other is to use a sport bike wheel. I originally wanted to go with a sport bike rear wheel, but was concerned about how much work it would be to make it fit. Since it looks like I'm gonna to have to do some fabrication any, I might as well go with what I want. I won't be able to do it this weekend, but I plan on going out to Rad Cycles ( www.radcycles.com ) , they have a pretty robust bone yard with a ton of wrecked sport bikes. I have all the measurements in hand and if I can find something that will work, I'll give it a try. So all in all, I'm pleased, still running into problems, but nothing I havn't been able to solve.
Cheers!!!
http://pg.photos.yahoo.com/ph/marklocklear/detail?.dir=8c67&.dnm=c289.jpg&.src=ph
...this is with the etching primer on it...I put a coat of El Cheapo flat black on it just so it looks a little better. I also did a quick mock up:
http://pg.photos.yahoo.com/ph/marklocklear/detail?.dir=8c67&.dnm=5679.jpg&.src=ph
...I know...looks pretty crappy, but you get the idea. The lines are what I wanted. With the forks slid down in the triple trees I figure I need about 6 over forks. I have a lead on a set from a guy off Hondachop, so we'll see if that pans out.
As far as the neck goes I think I solved my problem. If you recall the diameter of the neck was to large for the dust cover. So I used my angle grinder to take about 1/8 of an inch off the top of the neck...heres a pic:
http://pg.photos.yahoo.com/ph/marklocklear/detail?.dir=8c67&.dnm=b149.jpg&.src=ph
I was pretty proud of myself with this. The dust cover fits nice and slug over the neck now. I ordered a set of aftermarket sealed bearings for the neck. Hopfully they will be here today or tomorrow. I'm hoping they come today, I'd like to bolt it up tonight and see how it fits. Just checked ups.com and they left Illinois yesterday at 2pm...so I'll keep my fingers crossed.
So the rear wheel situation is pretty dyer. If you recall problem #1 was my axle did not fit the holes in the frame. Well the problem there was the axle holes are 3/4 inch, and the stock Honda axle is 22mm (or was it 20?). At any rate the axle is slightly larger than 3/4". The was a pretty easy fix. About 20min of grinding with my Dremel fixed the frame right up and I was able to get the axle through. So now I can bolt up my stock CB750K wheel. Well, with it all bolted up the wheel is off center by about an inch! In the immortal words of Goose to Maverick in Top Gun, "This is not good Mav!" Turns out the stock Honda hub is just to wide for frame. A fellow chopperhead on Hondachop has a cycleone frame, and he went throught the same thing. He says he has rear wheel from a CM400 that he is using that fits like a glove. So I'm working on two fronts now. One if I can find a CM400 wheel, the other is to use a sport bike wheel. I originally wanted to go with a sport bike rear wheel, but was concerned about how much work it would be to make it fit. Since it looks like I'm gonna to have to do some fabrication any, I might as well go with what I want. I won't be able to do it this weekend, but I plan on going out to Rad Cycles ( www.radcycles.com ) , they have a pretty robust bone yard with a ton of wrecked sport bikes. I have all the measurements in hand and if I can find something that will work, I'll give it a try. So all in all, I'm pleased, still running into problems, but nothing I havn't been able to solve.
Cheers!!!
Posted by: Lumbee / 6:43 AM 
