Slow day at the shop today... Everyone in San Antonio is at Fiesta Downtown and nobody's getting their cars fixed... I just can't understand why people would rather go to Fiesta instead of getting their cars fixed... anyway, all that free time means I get to tinker with My projects some...
Today I cut out the bad section of frame on my mountain bike and bent a new lower tube for it, the bend isn't too drastic, but should give me at least another inch of badly needed engine clearance... Before, my engine sat in there so tight that I had to pull the engine to remove the carb or even to remove a spark plug... I'm trying to get enough room that I can pull the head or the carb... or both with the engine still mounted in the frame...
Here's the bike with the bottom tube cut out... It's suprisingly strong enough to hold me without flexing like this, but there's no way I'd even pedal ride it like this...
Here's the bad section of frame that motivated me to do this in the first place...
And here's a trial fit of what the new tube will look like, I tried it with the bend closer to the bottom but liked the way it looks with the bend higher up, and this way offers the most room for the engine when I'm ready to put it back in... I'm gonna have LOTS of welding to do first tho...
Oops... almost forgot this one... This is just to show just how thin the wall thickness of these cheap Roadmaster Mountainbike frames really are... No wonder I blew a hole in the metal when trying to weld up the crack... and I had my amps and speed set really low too... I didn't measure the wall thickness, but if my eye calibration is still good enough, I'd say it's about .040" thick at best... I'll measure it tomorrow just to see if my eye calibration is as good as it used to be. The new tube has a .080" wall thickness so if anything breaks again, it won't be the bottom tube...
I've also been doing some of the more quick and easy stuff for the Stingray build like ordering the billet mount setup for the engine as well as the Manic hub & sprocket. I still need to get a seat for it and want to get a set of 14" ape hangers since it's a chopper after all. I'll also reenforce the welds in all the critical areas on this frame too since I have a really strong suspicion that it has the same thin wall tubing the roadmaster has... The lower tube of the Roadmaster is the exact same size and cross section as the Stingray bottom tube as well... More on that one as I go too...