Looks great. Neat project!
1966 Ducati bobber
- Thread starter DesmoDog
- Start date
DesmoDog
Been Around the Block
Thanks!
That's (the remains of) an engine from a 900ss or Monster, I've forgotten which. It came with my trackbike project. It may in fact become the new engine for my trackbike, but the fantasy is I will find the right 748 and it will provide a lot of parts to build a 900ss engine in a 748 case to come up with an air cooled "748". So far I haven't stumbled across any 748s that have been sitting in the back of someone's garage for 20 years with flaking rockers and need to be gone now, but it could happen.
That's (the remains of) an engine from a 900ss or Monster, I've forgotten which. It came with my trackbike project. It may in fact become the new engine for my trackbike, but the fantasy is I will find the right 748 and it will provide a lot of parts to build a 900ss engine in a 748 case to come up with an air cooled "748". So far I haven't stumbled across any 748s that have been sitting in the back of someone's garage for 20 years with flaking rockers and need to be gone now, but it could happen.
brad black
Been Around the Block
can you combine the tank rear hold down with the seat mount?
DesmoDog
Been Around the Block
I've looked at that but the angles are a little off. If I had thought about when I was doing th eseat mount it probably would have worked but at this point I'm just going with the bolt in the frame.
I plan to start working on this again soon. I got hung up on rebuilding a deck and it's taken twice as long as I ever expected. Yesterday I discovered on e more mistake that will require undoing what I thought was done and doing it differently... but I SWEAR I'm going to finsih that damn thing next week and get back to this.
DesmoDog
Been Around the Block
FINALLY getting back to this. No big strides but every step counts I suppose.
Since I had the frame stripped I hung it up on the scale. It's gone around once already so it's 28.5 lbs.
Now that the brake pedal shares a shaft with the centerstand, the pedal return spring wouldn't work in the stock set up, I had to move it out to clear the stand. I printed a few mounts and found that the spring would twist if it didn't have anything to sit up against, so I ended up with this to give the spring something to seat on.
Then I put it all togther and founr the spring doesn't sit on the surface after all. Oops. But I'm not changing it now.
The hardtail section of the frame interferes with the centerstand spring. I considered a few ways to get around this, but thought the simplest one would be to move the post on the frame and the attachment on the stand. That would change the geometry of how the spring acts on the stand. By moving it I'll lose some of the leverage it has to keep the stand up, but shortening the stand reduces the force needed to hold it up, so it shouldn't need as much leverage to hold it in place. So what's the best geometry that doesn't hit the frame? I modeled everything in Fusion and drew out the kinemtiacs, figuring the desired leverage needed due to the modified part's moment of inertia and then calulated the best position for the... yeah right. I held the old spring up to the frame, guessed where it might work, and drilled a hole for a new post. Grabbed some scrap rod from the pile, scraped a rounded slot in it with a modified cut off tool, and reamed the hole in the frame until I could jam the new post in.
After the mock up I found the change in length of the spring with the centerstand moving is less than I thought it would be. It might have worked, but today I mocked up Plan B instead. It's not perfect either but it should work fine. It's not a space shuttle.
Obviously that's pretty rough but it shows it will work. Problem solved in my book.
I'll be traveling a lot next month so probably won't get much done on this... but I hope it won't be another 7 months before I work on it again.
Since I had the frame stripped I hung it up on the scale. It's gone around once already so it's 28.5 lbs.
Now that the brake pedal shares a shaft with the centerstand, the pedal return spring wouldn't work in the stock set up, I had to move it out to clear the stand. I printed a few mounts and found that the spring would twist if it didn't have anything to sit up against, so I ended up with this to give the spring something to seat on.
Then I put it all togther and founr the spring doesn't sit on the surface after all. Oops. But I'm not changing it now.
The hardtail section of the frame interferes with the centerstand spring. I considered a few ways to get around this, but thought the simplest one would be to move the post on the frame and the attachment on the stand. That would change the geometry of how the spring acts on the stand. By moving it I'll lose some of the leverage it has to keep the stand up, but shortening the stand reduces the force needed to hold it up, so it shouldn't need as much leverage to hold it in place. So what's the best geometry that doesn't hit the frame? I modeled everything in Fusion and drew out the kinemtiacs, figuring the desired leverage needed due to the modified part's moment of inertia and then calulated the best position for the... yeah right. I held the old spring up to the frame, guessed where it might work, and drilled a hole for a new post. Grabbed some scrap rod from the pile, scraped a rounded slot in it with a modified cut off tool, and reamed the hole in the frame until I could jam the new post in.
After the mock up I found the change in length of the spring with the centerstand moving is less than I thought it would be. It might have worked, but today I mocked up Plan B instead. It's not perfect either but it should work fine. It's not a space shuttle.
Obviously that's pretty rough but it shows it will work. Problem solved in my book.
I'll be traveling a lot next month so probably won't get much done on this... but I hope it won't be another 7 months before I work on it again.