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Sweet build! As you ride for longer periods, does the gas get pretty warm from that pipe? I could see a heat shield being desireable under there. How do you like the VAPE? I was looking to do that with my DT3

I should have been more specific but you covered it anyway :) I was referring to the inner diameter of rotor matching the taper. Do you still have that reference available you found? I'd like to add it my library for future projects. If not, I'm sure I can find it with some keyboard work. Nice...

Impressive! How did you get the information regarding flywheel weight and inner diameter so you could do the retrofit?

What's the overall angle here? Saving money over other lightweight options or saving weight over other affordable options? I'm very intrigued by the project, but find myself asking....why?

Saving for potential project: Exhaust Calculator and Port Timing Max HP calc https://www.dragonfly75.com/moto/buy7calc.html Rear light option https://www.eaglelights.com/products/eagle-lights-led-auxiliary-taillight-upgrade-kit-w-integrated-turn-signals?_pos=1&_sid=a52926905&_ss=r

I refer to RBC Bearing's test when thinking of material and coatings for corrosion prevention. To quote the setup, "1.0 Testing Procedures Testing was conducted by Dayton T. Brown test facility in Bohemia, New York. The testing was done in accordance with RTCA/DO-160G, section 14.3.6.7...

Very nice!

First attempt resulted in THAT? Helluva nice outcome. You're making so many elements of the machine from scratch, I have to ask, are you making your own oil and gas as well :) ?

I'm sure I have the worst updates in terms of both timing and alignment with original topic. Why change now right? Here's the latest "progress" on the DT3: I kept hitting hurdles with the DT that required spacers or modification to existing pieces. Most notably making a complete swing arm...

Wow, that's some next level material usage. Usually metal guys don't get so crafty with other materials. Nice work.

What was the stick beating on the inner bridge all about toward the end? I love that can opener style rolling cutter. Gimme one of those!

It's measured from the bead-seat to bead-seat, also known as tire-mounting-surface.

Wow, best CB450 I've ever seen!

Welp, I thought I had some replacement rings but turned out they were 2.0mm instead of the 1.5mm I needed. In the true spirit of this scooter's "go crazy for cheap" manta - I use some muriatic acid to clean the aluminum off the nickel coated cylinder, sand papered the ring and piston groove...

I never updated this!?! That pipe was aweful. The peak RPM was WAAAY too high and as a result, I couldn't get the engine to climb into it's useable RPM range...it just didn't have the torque to get there. The next iteration of the pipe will be a bit larger diameter in the belly, shorter/sharper...

https://www.vintco.com/Yamaha-YZ250-1976-79-IT250-78-80-TY250-1974-78-DT250-74-79-MC250-73-75-Piston-Kit-70.5mm-0.5mm-Over

If you collect enough AF ratio info as you tune, I could see it being help in setting a target for future mods.

Well, another 6-7 months have passed and I still haven't made an inch of progress on the DT3. The good news is that I haven't forgotten about it nor has my wife come to expect it won't be the next money pit after I wrap up this sunroom insulation project. The bad news is that I'm still neck deep...

For better or worse - I'm not tired but keep running out of time in the day/night! It's been fun honestly. The biggest stumbling block is that we have a lot of built-in cabinets that are terrible for organizing the garage and shop, so I'm not able to get my welding / fab table setup & organized...

The lowest compression I've seen factory spec was on my 1984 JS550 twin Kawasaki Jet Ski. 115+/- 10 psi. It ran pretty good with 105psi and 87 octane. You have BAD compression. If I saw 95psi, I'd probably try to get it started by turning it over quickly and seeing if it' would take. Otherwise...