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This got me reminded of just how fantastic that gun is, but also how important the bits are! You'll never make a better tool investment than getting quality JIS (Japan Industrial Standard) screwdrivers if working on Japanese cars or motorcycles. And this is even more important when getting...

A nice bunch of new toys for cheap! I really like air tools as well, though no doubt it's psychological. I do like some electric tools though. I have an industrial Black and Decker screw gun that I use to remove 'impossible' to remove Philips (JIS) screws without damage. It has a variable...

Here is one where the foot peg is really far back similar to yours. The cable mount is on the foot peg bracket, not the frame because it's so far back, but technically it's chassis mounted. There is zero cable showing because the threaded cable end is resting on the housing fixture which acts...

I really like cable actuated brakes. Solves a lot of problems, lots of design flexibility, and super cheap and reliable. Your setup is really interesting. Fantastic idea mounting the brake end cable housing mounting bracket to the brake stay/torque arm! Seems obvious now that I see it, but...

Some good choices. Keep in mind, you can use all sorts of media in any blasting system, though the mess doesn't magically disappear (eventually) like baking soda. Good argument for a cabinet, though changing media is a pain. Every media is different, so you have to test them out for yourself...

'73, '74, and '75 models are very nearly identical, and as far as I know, are 100% interchangeable. Notable differences that could get you are the carburetor tops. The '75s had tall caps to allow longer slides. No tuning change, the longer slides reduce/eliminate the slides sticking/jamming...

So, by sandblaster, do you mean a cabinet or a total loss (outdoor) rig? A cabinet is vastly more useful, but you're probably not going to get one large enough for a frame! This is a picture of a slightly altered RD frame ready for finishing. (The spot that looks rusty is some kind of wierd...

Seems like a lot of trouble (and expense!) to paint bits and bobs with 2K. Single stage 2K Urethane will (unless altered) be super shiny compared to any OEM black frame paint. I like engine paint spray cans for quick little parts. Cheap, super easy, and pretty durable if you bake it. If...

70% is in the range for me. There is kind of a lot going on that might influence a preference. In my experience, most people seem to like suspensions on the stiff side. Talking about regular street riders here. I think it's because it makes the bike feel more solid, or stable, (talking about...

There is another consideration that is important when designing the rear suspension. The chain drive is impacted by more than just the chain potentially rubbing on the swingarm, though the fact that this can happen keeps most designs out of trouble even if not considered. The issue is the fact...

Actual sandblasting is generally way too harsh for anything other than frames and swingarms. (kind of too harsh for them too!) If you have enough compressed air for a soda blaster, I'd like to recommend getting a glass beading cabinet. A bit of money, but vastly more useful, and you can use...

Looking good in primer! Now's the time to go over it with a fine tooth comb to deal with any rough edges. There's always welding spatter, mig wire, rough stamping edges, etc. that can clean up very easily with a file or Dremel. It's a small thing, but but makes the restored frame that much...

Definitely! All manner of intermittent and 'can't figure this out' issues from this. An obvious tear makes it not work at all, but a tiny hole can be not noticed and result in unfathomable behavior until you find it!

https://www.allballsracing.com/22-1007.html https://www.economycycle.com/product-category/yamaha-rd250350400r5ds6ds7-parts/frame-related/frame-bearings/steering-stem-bearings-bearings-yamaha-rd250350400r5ds6ds7-parts/ The bronze bushings are ok for the swing arm. (don't forget to paint this...

Good thinking on painting. I personally prefer it to powder coating on frames. Lot's of good advice here, and good results too. Here's what I do. First, go over the entire frame carefully, and with a file - sander - grinder to smooth over any defects/hard corners/ mig welding wire/welding...

The plungers unscrew via the hex on the plunger body. Very likely they are a self contained unit with a piston that seals at the bottom against the carb body. There will be a passageway into the fuel bowl, and another into the bore. Both must be clear for the enricher to work (obviously). I...

Wow that's a lot of work! Nicely done. Definitely have to get it running properly. I failed to mention previously, starting fluid is pretty good for finding vacuum leaks if you still have some. It's ok as long as the engine is already running. When hunting vacuum leaks, be aware that air...

Trouble shooting and diagnosis is by far the most difficult task most bike owners have to deal with. You can be very skilled taking things apart and fixing them, but determining what actually needs fixing can be exasperating. So it's helpful to have a methodical approach. Engines are complicated...

First, I suggest avoiding using any sort of starting fluid other than the fuel the engine is designed to run on. I realize that opinions vary intensely on this, but having designed and built engines for over 50 years, I've never used it. Any engine not starting pretty much straight away always...

Feel like I missed something. I believe the frames on '73, '74, and '75s are identical. Some trivial differences in the complete bikes, but not the frames. Certainly the frames are functionally interchangeable, so positive id, aside from registering, would seem unimportant.