[dirt_dog]

Ok I no some of whats needed to switch over from 300ex to 450r a-arms and shocks but, could someone break down a detailed list of everything to help me out,and for a 450r swingarm switch with shock?I no its alot of work and it needs mods to work.I have time and it needs a complete rebuild so if any1 can help thank you.

 

[tomgodd]

I would suggest 400EX A arms. THey bolt up. Not sure about 450 arms. You will need a shock relocation kit from a company like Diamond J Customs | Quad-Rodding Systems & Suspension Kits to bolt the shocks up properly and give them the proper working angle.
I have no Idea of what to do to the rear of the machine to make the switch. A 450R works with a linkage and the 300EX does not. Somebody may chime in with an answer.
Welcome to the Family!

 

[dirt_dog]

Well from the reading,so far I know that the 450r a-arms will fit as long as I use 450r tirerods and shocks with relocation kit.The swingarms on 400ex and 450r both have linkage on them and 300 dont so I would have to weld a mount to the frame,but I would need a linkage that would fit and I cant find that info from where I have looked.I also cant find any pictures of the set up being done or done so far.I also no I would have to use all the 450r spindles and stuff.I just dont want to did this switch over blinde and guessing.So if anyone has done this switch over or a 300ex to 400ex please put what you know and pictures if you have them. Thank You

 

[kellyturtle]

it can be done

i just finished my 450r swingarm on a 87 250x. there are a few tricks to it but nothing a good shadetree couldnt do. if your interested i can walk you through it

 

[69quadracer]

Well from the reading,so far I know that the 450r a-arms will fit as long as I use 450r tirerods and shocks with relocation kit.The swingarms on 400ex and 450r both have linkage on them and 300 dont so I would have to weld a mount to the frame,but I would need a linkage that would fit and I cant find that info from where I have looked.I also cant find any pictures of the set up being done or done so far.I also no I would have to use all the 450r spindles and stuff.I just dont want to did this switch over blinde and guessing.So if anyone has done this switch over or a 300ex to 400ex please put what you know and pictures if you have them. Thank You

I have a set of like new 07 450 a-arms and tie rods less the ends and a stock linkage for a 07 450 swing arm pm me if interested will make you a good deal.

 

[838xcracer#1]

We run 400ex a-arms on our 300 they are awesome. Also Rathracing makes the best front shock relocator. I do know you have to use the 300 spindles. The 400 spindles won't work right. We used all 400ex parts on the a-arms like tire rods and ends.The brake lines do work with stock a-arms.

 

[my5sons]

We run 400ex a-arms on our 300 they are awesome. Also Rathracing makes the best front shock relocator. I do know you have to use the 300 spindles. The 400 spindles won't work right. We used all 400ex parts on the a-arms like tire rods and ends.The brake lines do work with stock a-arms.

Wait, those are aftermarket 400ex arms right? And they are adjustable? Because I heard that the STOCK 400ex arms screw up the geometry and cause all sorts of issues on the 300ex. I never got anyone on here to confirm or deny that. I want to buy stock 400ex arms off a guy here. Many on other forums have said that it kills them to ride like that, and then when they go with the aftermarket 300ex extended arms, problems solved.

Hear anything about that?

 

[mdb1971]

I had 300ex stock a-arms with 450R shocks for a while it worked,but you cant really adjust the ride height.I now have 400ex stock a-arms & I think there great,I really like them

 

[mdb1971]

I'd like to know about putting the400ex swing arm and shock set up on my 300ex.

 

[stallion81]

450r A Arms WONT work on a 300ex.... without modification. The frame mount side is too wide. In order to work, you have to cut off the a arm bearing housing, and move them closer together. It has been done, and can be, but you need a good clean cut, long threaded rod to hold both a arm end housings at the right distance apart. Tricky to get it right, but it can be done.

Ive got a complete 400ex front on mine now, and it is fine. I was worried about the negative camber, but rode it, got it on a level floor with both fronts at 30psi. Its not that bad. Sitting at about negative 3.5-4 degrees. "Heard" the 300ex spindles work better, but... 450r front shocks on it(diamond J) dialed in on first try. Hugs and no more tippy feeling.

Cant comment on the swing, got a steal of some ITP offset beadlocks for the rear with the 450r front shocks. Widened the rear, no need to extend it for the wife =). Just gonna slap a 01' raptor 660 rear shock on it and call it good.

BTW, I do have a set of 450r a arms I need to sell(cheap). Balljoint seals are not perfect on all, but if any one wants to try and mod for a 400ex or 300ex, might as well go all the way, and mod the balljoint sides to accept aftermarket balljoints. This has been done also.

If you are, or know a good welder/or just sharp with figuring stuff out, anything can be done. Fabbing stuff that "wont" work is the a fun part of the hobby. My Yamaha Blaster has 450R shocks all the way around, GSXR rear brakes(not modded by me), and YFZ 450 heel guards =).

 

[838xcracer#1]

Like I said u have to run the 300ex spindles. The 400 spindles are the problem. The 400ex a-arms work fine.

 

[Redracer]

Ive got a complete 400ex front on mine now, and it is fine. I was worried about the negative camber, but rode it, got it on a level floor with both fronts at 30psi.

Holy Crap, 30PSI??? I run 4-6PSI.:r_c:

 

[stallion81]

I dont run at 30psi, tires hold 36psi. You get a more accurate camber reading with the tires full. 4-6 PSI? Wouldn't that be hard to turn and easy to blow a bead?

 

[Redracer]

LOL, ok. I was gonna say that kind of air pressure is nuts.

4-6 PSI in a set of Razr2's up front and the thing corners like it's on rails. The harder packed and smoother the race course, I might bump the fronts up to 7 or 8. Have you ever tried to break the bead seal on an ATV tire??? I have never had any issues running that kind of air pressure. Everyone i race with rides close to the same.

 

[Drsprocket]

Just finished installing a 2005 450R swingarm on my 1994 300EX frame. Slid into my frame perfectly. Had to use the 300EX bolt, since the rear brake pedal installs on it. Also, used the pivot spacer (tube) for the 300EX, since it is the correct length, and the inside diameter of it is the right size for the bolt. I used the 450R link, and welded a bracket to my frame to bolt the link to. Used a 1988-89 TRX250R rear shock. Had to machine a bushing for the bottom shock eye, and had to cut out the upper shock mount from the frame, and re-work that area, but the end result is worth it. The swingarm is 3-1/2" longer than stock, and the axle is 3 inches wider. Used 400EX lower front control arms, 1987 250R upper control arms (they have adjustable ball joints), and 400EX front shocks with JB shock mount bracket. Also had to move my rear sprocket outward to get my chain alignment correct with the 300EX engine. I had a sprocket mounting plate made from 1/4" aluminum, and bolted it to the OUTSIDE of the sprocket mounting hub. Then, bolted my sprocket to the INSIDE of this plate. This puts your sprocket right in line with the sprocket mounting hub, instead of along side of it. Perfectly aligned the chain.

 

[Toxicaftermath]

Would 450r shocks front and back fit on 300ex?

 

[TRX2fiveO]

Would 450r shocks front and back fit on 300ex?

rear no
front yes with fab work or a relocator kit like from diamond j customs

 

[Toxicaftermath]

Thank you I appreciate it.

 

[TRX2fiveO]

Thank you I appreciate it.

click the link at the bottom of my sig. . . I ride a 250X but it's the same exact quad