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Jay92 Started a new thread 1992 Yamaha yz250
11/19/2021 5:09pm Owned the bike since 2003-4, rebuilt the engine with all new bearings, seals, piston, rode a bit here and there until 2010, then bike sat in the garage for 10 years. Starting point, February 2021 Fresh gas, started on the 5th kick or so 
Idea was to do a full restoration in original colors but.. it went to...
Idea was to do a full restoration in original colors but.. it went to...
This forum thread has 29 replies.
Jay92 Added a reply to 1992 Yamaha yz250
11/19/2021 10:55am Good to see you working on the bike. Sandman and 450exc pretty much nailed it. Shock preload looks like its about the default, so normal for the era, measure/adjust preload before installing (forgot myself, extra work on the bike) .. and your dics is toast.
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450exc115 Liked a reply to forum topic 1992 Yamaha yz250
11/19/2021 10:43am
I have had 2 of 3 front disks on my late 80 Yamahas Spring like yours when removed from the hub. Just toss it and replace it. Back in the 80s and even 90s the OEMs used more damping and less spring rate when designing suspension so compared it to todays bikes I'm not surprised to see a bunch of preload on the spring for a rider to get the sag in the box.
This forum topic has 29 replies.
Jay92 Added a reply to 1992 Yamaha yz250
10/4/2021 3:42am So I finally got the bike to a semi-finished state. Still debating if I should go for all the decals/stickers. Its a version after all with the white frame, silver engine parts/covers, red spring, modern foot pegs.. so not a spitting image of the 1992 factory bike (the -93 would have been closer to factory -92). 
Jay92 Added a reply to 1992 Yamaha yz250
8/25/2021 11:43am Added disc and fork guard, UFO plastics. Looks like 2 bolts, 2 minutes and done but it was not
Needed to change the brake caliper bolt to a longer one (35 to 50mm), created threads inside the front axle (8M) and bought 2 x 7mm wide rubber grommets for the bolts so that the disc guard would sit correctly...
Needed to change the brake caliper bolt to a longer one (35 to 50mm), created threads inside the front axle (8M) and bought 2 x 7mm wide rubber grommets for the bolts so that the disc guard would sit correctly...
Jay92 Added a reply to 1992 Yamaha yz250
8/20/2021 12:53am As I wrote earlier, this is going to be a bit different, some new parts, some original, some traditional color schemes from the past (more on that later) but not a 100% copy.. it will be a combination. 
Shock has new bearings and was serviced, new bump stop. Painted the spring, several coats and clear on top as well...
Shock has new bearings and was serviced, new bump stop. Painted the spring, several coats and clear on top as well...
Jay92 Added a reply to 1992 Yamaha yz250
8/19/2021 11:18am Here are some added, not original parts. Modern larger foot pegs from https://www.vandijckmx.nl/ They also have oversized pin sets (I bought new originals as there was no play) Polished the original brake lever 
New HEL brake lines. Caliper was cleaned and new pads, pins etc 
HEL line in the front as well, new Renthal bar, cant remember the...
New HEL brake lines. Caliper was cleaned and new pads, pins etc HEL line in the front as well, new Renthal bar, cant remember the...
MX252 Liked a reply to forum topic 1992 Yamaha yz250
8/17/2021 10:49pm
Nice choice! I had one brand new early 92 raced it for two seasons loved that bike!, one of many one of my favorites we had great colors back in the day and so was our gear, keep the pictures coming looking forward to seeing the finished product.
This forum topic has 29 replies.
TooOld4WFO Liked a reply to forum topic 1992 Yamaha yz250
8/17/2021 10:48pm
That kind of help with the links is outstanding Jay. Thank you for that. I would have preferred the stock pipe but this one has a Bills. You did a great job with the rattle cans. This YZ will look fantastic brother. Great thread.
This forum topic has 29 replies.
vet323 Liked a reply to forum topic 1992 Yamaha yz250
8/17/2021 10:48pm
Were
This forum topic has 29 replies.
Jay92 Added a reply to 1992 Yamaha yz250
8/17/2021 12:17pm Thanks! Early 90´s Yamahas have low/mid power with the stock pipe, new FMF and PC pipes are readily available and can change the character quite a bit. For slow hobbyist like myself, its easy power to ride.. someone faster would want to put a PC pipe to make it rev longer with more top end power. Cmsnl is the premium...
TooOld4WFO Liked a reply to forum topic 1992 Yamaha yz250
8/17/2021 11:54am
Great job. I need to restore a 91 WR 250 so I am interested in this build. Hopefully you haven’t had any issue sourcing parts. That would be very encouraging. How were these early 90 motors? I’m thinking pretty tractable with loads of low end.
This forum topic has 29 replies.
buenavides Liked a reply to forum topic 1992 Yamaha yz250
8/17/2021 11:53am
Good luck with this build, keep us posted with more photos.
This forum topic has 29 replies.
Chance1216 Liked a reply to forum topic 1992 Yamaha yz250
8/17/2021 11:53am
There’s a few videos on YouTube that have helped me with bent radiators. I believe it was Cameron Niemela who had one for straightening them tacos out.
This forum topic has 29 replies.
Jay92 Added a reply to 1992 Yamaha yz250
8/17/2021 10:43pm Frame was done by a pro but all other parts and wheels were done by me. Wheels were painted with a can and have several clear coats, will see how they hold up. Brake cylinder has glossy black, several coats but no clear coat as they looked quite glossy enough without it. Radiators (and some other bits) plus clutch/power valve...
Jay92 Added a reply to 1992 Yamaha yz250
8/17/2021 10:47pm Radiators were a bit tacoed but they will have to do for now, cleaned and painted. 
New hose kit with a bit of color. Wiring was cleaned, it was in pretty good shape. 
Painted the front brake master cylinder, throttle housing etc. small bits and pieces. New throttle cable and some NOS spare parts like brake lever cover...
New hose kit with a bit of color. Wiring was cleaned, it was in pretty good shape. Painted the front brake master cylinder, throttle housing etc. small bits and pieces. New throttle cable and some NOS spare parts like brake lever cover...
Jay92 Added a reply to 1992 Yamaha yz250
8/17/2021 10:47pm Pipe welds were blued, was thinking about painting but I liked the raw look. Clutch, power valve and water pump covers were painted. 
Jay92 Added a reply to 1992 Yamaha yz250
8/17/2021 10:46pm All swingarm and linkage bearings/seals were removed. Old ones were pretty rusty. All bearing surfaces were protected and the swing arm was blasted as well. 
Rear rim was welded and rims were painted 
Rear rim was welded and rims were painted
Jay92 Added a reply to 1992 Yamaha yz250
8/17/2021 10:45pm Poor lighting but the frame was wet painted, I wanted the original color and also to be able to see cracks as the bike will be ridden. I tried to track down the original code for the paint but no luck. ”Purplish white solid 1” and its abreviations were the only thing to go by but the details/formula for the...
Jay92 Added a reply to 1992 Yamaha yz250
8/15/2021 9:04am Frame prepped for blasting/paint. 
Frame and pipe blasted, pipe dents fixed.. cleaned up nicely.. all the big dents came out so pretty happy with the result. 
Frame and pipe blasted, pipe dents fixed.. cleaned up nicely.. all the big dents came out so pretty happy with the result.