MotoDromo Special II : New video! with ride...

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I didn't get much time to work on the bike today, but I did get a cool high compression cnc head in the mail from gasbike.net. Ive never tried one of these before but it was only $60 bucks and looks really cool imo...

Back to the rear stays, I kind of messed up with the frame jig and I didnt think about being able to get a rear sprocket on it, so I kind of shoved it in and got a close idea of where the chan will be. But I was able to align it to the front drive sprocket and because of the curvature of the top stays there are no clearance issues at all:thumbsup:. All I had time to do after that was cut up a small piece of scrap tube and do a quick mock up. I got a few options that wont interfere with the chain, and I was going to make a little idler sprocket anyway, so everything is looking good!


I think I'll make the dropouts and weld the top stays to the down tube before I start the trellis. But at least I know im good to go.


Thanks for looking! :)
 
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g-ratter said:
Keep an eye on your chain lines. I did something similar once and ended up with the chain scraping the frame.
Click to expand...
gowjobs said:
Is the engine's drive chain going to clear that stay, now that it's placed so low, or are you going to have to cut it and step it out a bit?
Click to expand...
Because the top stays have the same curve as the bottom ones there are no clearance issues:dance2: I definitely didn't expect that, and I was prepared for more chopping. I love it when things just fall into place:)
 
Got a lil bit of work done today and made a reinforcement tab for the seat stays. I started with some CAD design:grin:



Transferred it to some 1/4 in plate and cut it out...



Et voilà, I think that should be strong enough o_O even though Ill still shove a long seat post down in the seat tube for even more strength. Im going to need it because apparently the head I got bumps the power up to 4hp!



Thats all i got today:( but there were a few of you interested in my chain clearance, as luck would have it this is what I got without any modification:dance2:



And a bonus image with the fork and some wheels kinda on.
Thanks for looking!

 
I love the CAD*

*Cardboard Aided Design
 
A little more done today, but I got the important leveling and measuring parts done.
First I spaced the drop outs to match the upper stays' width...



Then I clamped them down and made sure everything was nice and level .



Busted out the cut off wheel again...



Everything was looking good so I went ahead and tacked it all up!



After this final cutting and tacking, the support tab I made a few days ago was too narrow. So out came the CAD tools again.



After a good amount of massaging and tweaking the tab fits like a glove.



I couldn't be bothered to make new drop outs as you can see, but I will clean these ones up and probably reshape them a bit.
That's all I got today. Thanks for looking!
 
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I got a lot done today and i'm quite happy with how things are going even though I still have a LOT of work to do on the bike. First I cleaned up the tab and ground down the edges a bit to help with the weld penetration.



Some welds...



Some more welds...



Then I cut off the original stay support and cut the ends of the stays a bit because it was interfering with the motor's clutch arm.



I tried to flip the frame around on the jig to mock up the rear wheel, but the forks ended up about 7 inches from my crappy jig bracket. So a little modification was in order...



Pretty simple but I think it should work fine.





I mocked up the rear wheel with one I grabbed from my other motorized bike and Ill also be using this little 10 tooth idler somewhere. Thankfully there is no interference with the chain after the final welding.



Now I could finally start the trellis struts to reinforce the "swingarm". I decided to use 5/16 solid rod instead of the 1/2 tube for a little extra clearance from the chain, and it should be just as strong...





Now all I have to do is finalize the angles and grind all the ends for a nice flush fit.



That's it for today. Thanks for looking!
 

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