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Post by scottyrob on May 27, 2024 20:33:44 GMT -5
   Work travel, college graduations and some other real life stuff have kept me away from the project. But rainy memorial day weekend provided some shop hours to work on it. I vapour blasted some fasteners and fittings. More progress removing "flame spray" coating from the supertrapp. I fitted the new swingarm bearings, then fitted the swingarm to the frame. I also used 2 stage clearcoat on the crankcase, oil filter and countersprocket covers. Nice having a paint booth to work in. I have marzocchi piggyback shocks AND progressive shocks. The progressives ride better and don't need any work other than the cleanup I gave them. One of marzocchis has a blown piston seal. But I'm really fond of the marzocchis, may have the one rebuilt. The major blocker on re-assembly right now is the steering head, the ball bearing races haven't arrived yet. Once they do, it will be a rolling chassis in short order. |
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Post by scottyrob on May 27, 2024 20:35:07 GMT -5
  A couple more pix here. I still need to sort out the fender and fork brace situation. I'd rather have a fork brace integrated into the front fender like the Lossa Deus SR500... |
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Post by scottyrob on May 27, 2024 20:58:19 GMT -5
Well if you've got Yamaha roller bearings and they match the thumper stuff ones for height then great. My experience height-wise was similar to others (posted on the old version of the forum.) My test was to stack the upper & lower bearings on top of each other and read the height. The roller bearings came out 3mm taller overall, than the loose balls in their cones that came off the bike. That 3mm height difference is a problem when reassembling! The issue with the neck fitting is a mystery, unless the tight interference fit of the originals is easily achieved in the factory with a press, which none of us have at home. When I tried fitting the inner race of some aftermarket roller bearings I had the same problem you have. That was the clincher for me and instead fitted cones/balls, except I used caged balls. I'm guessing you could take a file to the neck until the inner race fits. Not elegant but strength of the part would not be reduced by the removal of such a small amount of material. Just a thought. I figured out why when looking at the Clymer manual again. My '78 has a steering stem that tapers right above the dust cover and lower ball bearing race. The Clymer manual shows a straight/no taper steering stem with cassette bearings bottom and top (the manual says to replace the cheap OE loose balls with quality cassette bearings), but I've had a '78, '80 and '81 and I THINK they all had tapered steering stems. I have two sets of cassette steerer bearings, no idea what bike they fit, if anyone wants them (hehe). I'll post the yamaha part numbers next time. |
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Post by scottyrob on Jun 9, 2024 20:18:19 GMT -5
I created a big problem for myself, I lost the top chrome nut for the upper triple and it took me at least two hours to find it (had rolled under one of my shelving units, I kept checking my parts bins thinking I MUST HAVE overlooked it). But then I cleaned up some gunk and corrosion from it using the buffer, and then cleaned up all the fasteners for the triples to hold forks etc. Good progress today and will be coming together quickly as I have all the gaskets for crankcase covers etc, and previously cleaned up all the engine mount brackets and hardware.
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Post by scottyrob on Jun 16, 2024 7:20:53 GMT -5
She's a roller. Very rainy here lately, more shop time than anticipated. Also placed the crankcase covers, magneto, flywheel, counter sprocket (engine in background). Fitting various frame items. Still haven't figured out the front fender/fork brace situation.  |
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Post by scottyrob on Jul 4, 2024 20:50:49 GMT -5
More rain in these parts, so more project happenings. I figured out that rear caliper placement, but my hose binding up was confusing me. Then I noticed that I had mounted the old front caliper instead of the rear caliper. The banjo is on opposite sides of the calipers. Had to redo that. I finished cleaning up all the fasteners with a wire wheel and the last parts rattle canned in satin black. So more assembly of frame brackets etc. Then I spent a couple of hours cleaning the motor, and then mounted it today. This is the third time I've placed the motor back in, first time was after boring it out and placing the 540cc wiseco piston and rings. The jigsaw of swinging it into the frame and setting iti in the bottom engine mounts gets easier though I'm not as strong as the first time I did it 20 yrs ago! More rain this weekend so will probably mount the chain and get the sprocket cover back on, along with the shifter and other bits. And mount the mikuni carb and k&n. Does anybody have a good diagram of the frame mounts? The yamaha parts fiche on partzilla is great for finding parts and lousy for where/how they're placed on the frame.  |
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