300ex to 400ex or 250r A-arm Conversion need Advice

[RideRed389]

I want to make my front end better and i need some help on which to pick. Should I go with 250r a-arms or 400ex a-arms or are they the same. also what is involved with the shocks. should i buy some 250r or 400ex front shocks and how should i mount them. i know that i need to raise the top shock mount up a little bit but do not know where to get the bracket from.

[300exOH]

I like the 87-88 250R a arms because they have adjustable camber. You can order custom shocks and use the stock mounts or you can buy(or make) a bracket to fit stock 400ex or 250R shocks. You can find the bracket on ebay. I think a search on ebay for 300ex a arms or just 300ex will do it. Also you nbeed to use the 300's bushings with the 400ex/250R arms. It's a pretty simple conversion. The worst is getting the ball joints loose without damaging the boots. Good luck.

[Butters]

how exactly did you get the ball joints loose without damaging the boot?

[300exOH]

You can use different size sockets(longer and shorter ones) to get the job done.


2 sockets, one long and one short and a 15-17mm ?wrench


I usually loosen the nuts till they are flush with the thread end then I put the socket in between and untighten the top or the bottom nut, and repeat for the other ball joint which is still stuck.(the second ball joint usually needs the longer socket to pop the 2nd one out)

when you do this, its a gamble on which ball joint will pop out, not that it matters.


If you hit the spindle and the ball joint pops out you run the risk of bending in the hole were the ball joints goes in.

Hope this helps. It worked well for me.

[Diedrich]

yeah get the 250r adjustable ones..thats what i got..yeah gotta use the 300ex bushings but that was no problem