How to change the suspension on a YZ 125 05?

Question

The suspension on my YZ 125 is really tight and im wondering how easy is it to loosen it up and what kind of tools I need?

Answer 1

There is a lot to know about suspension setup. You have to get your static, race sag, compression and rebound all set correctly. The only tools you need are a screwdriver and a spanner wrench. Do some reading and post questions if necessary on the site below. Getting your race sag (amount the shock compresses when you stand on the pegs in full riding gear) set correctly is the first step. It is not very hard but you will need one person to help. Once race sag is set you check the static sag (the amount the shock compresses under the bikes weight only). If the static sag is incorrect then your spring needs to be changed to a heavier or lighter rate. Generally a 125 is sprung for a 160 lb to 180 lb rider so if you fit in that category you should be fine. Trying to adjust rebound and compression without first getting your sag right is about as useful as pi$$ing in the wind.

http://www.thumpertalk.com/forum/forumdisplay.php?f=47

Answer 2

First, bleed the air out of forks, Then set the sag per manual. Yo set the sag in the forks by changing spacers. On the shock by turning the double stop rings. After that, if it's still too "tight" go to pro-action's website and check that you have the correct spring rates front and rear for your weight and riding style. After that you can fine tune using the clickers and if you have to get a hair more precise you can change fork oil weight. It's supposed to be pretty firm for MX track use. You should get a service manual. It will have pictures of the tools you need. All you need is basic tools to remove the forks and take them to your local performance shop for tuning. Probably not worth doing major work to the back unless it's real bad. You should start with the rate and sag before you hit the clickers though.

Answer 3

You'll need a center stand, a large socket or box end wrench the size of your fork caps and a rear shock tool or large channel locks.
For the front, put the bike on the stand, remove the fork caps( using caution as the may have spring tension behind them). Remove and shorten the pre-load spacers 1/4".
Rear, loosen the lock nut on the rear shock spring and loosen the adjustment nut 1/2 turn and re-tighten lock nut.
Repeat these steps until you like it.
If you wanted to you could drain and replace the fork oil with ( Light oil).

Answer 4

definite they might desire to. relies upon on if yamaha substitute the physique style of the one hundred twenty five between the two years. i dnt think of they did however. you may desire to be stable. i understand for an 80 5 plastics from 02 to 09 have been the same. in basic terms verify online wish this facilitates

Answer 5

Suspension tuning -
http://www.brucessuspension.com/
If this sounds confusing, purchase a shop manual -
http://www.motocom.com/motorcycles/