Yamaha YTM Front Shock Disassembly How-To

[onformula1]

Today I took apart a spare fork I have to refresh myself as to how they work. Simplest fork in the works and possibly the crappiest as well.

So here's the thing; I know these are never going to do anything but bounce up and down, but what's driving me nuts is the noise mine are making, particularly when they top out. The bottoming I can live with and maybe even eliminate with enough oil in them, but when they rebound back to open after either a good bounce, or if I pull the front end up for a wheelie they make a terrible metallic noise.

I was concerned that my steering head had come loose, but it's fine. I replaced the ed out balls with tapered rollers when I rebuild it and have checked it since.

I don't recall these noises when the trike was new. Could it be as simple as changing to 30W oil? (using 20 at the moment) or maybe the underside of the stock seals have more rubber that the seals I installed and this deadens the impact?

Was thinking of adding a Teflon washer under the seal as well and maybe one for bottoming out as well. Do any of yours make these sounds? Has anyone gotten rid of them?
Attachment 223433

Your best bet would be to swap to 225 forks, they are superior.

The 200 forks don't have a top out spring, so it's metal to metal.

Stock oil weight was 10WT, if you are using 20WT, I would switch to 30WT it will help and mask some of the worn internals as well.

[El Camexican]

Your best bet would be to swap to 225 forks, they are superior.

The 200 forks don't have a top out spring, so it's metal to metal.

Stock oil weight was 10WT, if you are using 20WT, I would switch to 30WT it will help and mask some of the worn internals as well.

I guess someone pulled a fast one on me. The spare fork I took apart was alleged to be off a 225 Oh well, I got the straight tube I needed out of the other one. I don't think I'll bother with the 225 upgrade. Let me try the 30W. Thanks!

[onformula1]

I guess someone pulled a fast one on me. The spare fork I took apart was alleged to be off a 225 Oh well, I got the straight tube I needed out of the other one. I don't think I'll bother with the 225 upgrade. Let me try the 30W. Thanks!

The 225 has a real (Modern for 1985ish) damper rod, top out spring, valving and bottoming cones, they even made a Terry Cable Kit for them back then with extended travel and heavier fork springs.

[El Camexican]

The 225 has a real (Modern for 1985ish) damper rod, top out spring, valving and bottoming cones, they even made a Terry Cable Kit for them back then with extended travel and heavier fork springs.

I know what you're trying to do! Stop it!

[onformula1]

I know what you're trying to do! Stop it!

You too funny!

They are much better if the right deal ever comes your way.

[El Camexican]

You too funny!

They are much better if the right deal ever comes your way.

Just bought a set. I hate you!!!! Now please tell me I don't need a different wheel, hub and brake and I might upgrade you to "piss me off" status.

[onformula1]

Just bought a set. I hate you!!!! Now please tell me I don't need a different wheel, hub and brake and I might upgrade you to "piss me off" status.

They are the same, now you can run 15WT. fork oil.

[El Camexican]

They are the same, now you can run 15WT. fork oil.

1983 200
Hub, Front 29U-25111-00-00
Spacer, Bearing 29U-25117-00-00
Plate, Brake Shoe SILVER 21V-25121-00-35
Axle, Wheel YTM200K21V-25181-00-00
Oil Seal, Swo-Type 93110-30013-00


1984 225
Hub, Front 29U-25111-00-00
Spacer, Bearing 29U-25117-00-00
Plate, Brake Shoe U.R. Silver for cpy 21V-25121-00-35
Axle, Wheel 29U-25181-00-00
Oil Seal, Swo-Type 93110-30013-00

Yep, only issue might be the axle. Not sure why the P/N change. I hope they aren't bent too badly.

[YamaBoss]

I know the 225 is not a bolt on upgrade like some claim. The 200 forks have a skinnier base then the 225. I swapped a set of 225 to my 200e and had to get a custom axle made to fit it. As far as I know you would have to do the same with the chain driven 200's.

The axles are different as far as I can tell, I think the 225 axle might be a bit longer. Definitely a reason for that part number difference.

[YamaBoss]

Gold is a 200 fork
Black is a 225 fork


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[El Camexican]

If it was easy everyone would be doing it... so I keep preaching to my coworkers.

Thanks for the heads up

[onformula1]

Nico , Si no funciona te haré un eje personalizado wil un cambio rápido Euro configurado. Usted sabe el número.

HaHa!

[El Camexican]

Nico , Si no funciona te haré un eje personalizado wil un cambio rápido Euro configurado. Usted sabe el número.

HaHa!

Ta bueno guey. Te aviso cuando tengo oportunidad a revisar los nuevos amortiguadoras, pero creo que puedo hacer un eje aqui.

Saludos

[El Camexican]

Finally got this project together. The first set of forks I bought were in amazing condition. Unfortunately I managed to damage one of the tubes and had to buy a second set to get one good inner tube. The eBay seller took the better part of a month to put it in the mail and then removed the brake cable holder that was clearly shown in the eBay pictures before he shipped it. When they arrived one fork was bent about .200" and the other about .050". I left it like that as my fork straightening endeavors have never worked out well (I need to learn how one day). I had to remove one of the caps by drilling it out like the OP of this thread, worked great!

I used the down time to strip the black paint off the fork legs. I was going to powder coat them, but as always seems to be the case I can't resist polishing aluminum, so they got buffed out.

OnF1 shared a few tips that were executed to improve the feel of the forks and they seem to have worked very well. The difference over the 200 forks is night and day. Thank you Milner!

So, anyone looking to do this needs to get an axle from the 225. That's the only part that changes because the 225 axle is longer than the 200 axle. You also need to run the forks about 7/8" above the tree or the front brake cable will be too short. This is because the 225 forks are a little longer than the 200 forks. The tab that holds the brake cable is discontinued, but you can cut the one that is welded to the 200 fork off and drill it to fit the 225 forks which is what I ended up doing.

[onformula1]

Wow!, as usual Primo work.

That trike is good looking.