350X 400EX Transplant Build!

[Shawn Powell]

Love the pegs but not feeling the bars, thinking they're too narrow

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Matt, I went with the renthal vintage bends. About 1” maybe more wider than my 400ex bends. Also a wider clamping area. I like them a lot. Fee a lot better than the 400ex bend ones did.


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[captainweezy]

Matt did you get this puppy finished?

[Matt85'350x]

Matt did you get this puppy finished?

Sadly no, it's still in my garage. I've somewhat lost interest unfortunately. I know I have to finish it though cause I can't sell it in it's current state lol.

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[Merge_88]

Update on this project with the permission of Matt.

I followed Matt's build on this transplant from the start with the intentions of building my own 350X/400EX to the point of getting the motor mounts, donor 400EX, and 350X rolling chassis. Long story short, I got side tracked by building a WR450 trike conversion and never built the intended 350X/400EX conversion. I sold off all the parts I had to build the 350X/400EX to fund the WR. After finishing the WR, I decided I still wasn't happy with it for an everday/all day trail machine. The WR is awesome in it's own right, but is just too much for the tighter technical trails I like to ride. This got me thinking about the 350X/400EX conversion again, a few messages back and fourth with Matt and we came to a deal on the sale of this project. About a month later and with the help of Captain Weezy, I was able to get this trike back to Illinois and in my shop. So I'll pick up right where Matt left off on updating the build of this transplant.

I basically got the trike in boxes and have been piecing it together. Since receiving the trike, I've mounted up the carburetor, shortened custom air box (from eBay) and oil tank. I've also installed the oil cooler and ran some temporary rubber oil lines so I can at least get the engine started soon.(I'll be looking into getting some stainless lines made in place of these rubber hoses). I've also been working on getting the brakes installed along with the throttle, cables, levers, chain, etc. My next step will be to run the wiring harness and electrical parts. Once that is complete, I should be at the point of trying to fire it up.

Overall, I don’t plan to change much of this build as Matt already put a lot of time and thought into making it all work together. I’ll just be adding some decals and detailing the engine once it’s a runner and mechanically sound.

[BOB MARLIN]

It's funny how things work out. Glad to see someone take over that project. Did Matt just get burned out on it ?. It looked like it was coming out real nice.
I'm kinda just the opposite of you. I have three 350x's and haven't ridden any of them or my 250r since I finished my WR450 trike. It's been 2 years now and I have no desire to ride anything but the 450. I'm assuming you ride a lot of tight trails, where as I ride all sand and open desert. If you want to sell that 450 there is probably someone out west that would snap that thing up.

[Merge_88]

It's funny how things work out. Glad to see someone take over that project. Did Matt just get burned out on it ?. It looked like it was coming out real nice.
I'm kinda just the opposite of you. I have three 350x's and haven't ridden any of them or my 250r since I finished my WR450 trike. It's been 2 years now and I have no desire to ride anything but the 450. I'm assuming you ride a lot of tight trails, where as I ride all sand and open desert. If you want to sell that 450 there is probably someone out west that would snap that thing up.

You are correct, we ride tight technical trails here in the Midwest. The 450 doesn’t like to be lugged in stuff like that. I’ll probably hang onto my 450 with hopes of a desert trip someday. I do play in the open fields on it, hard to not like it’s torque and top end!

[ICS Vortex]

Update on this project with the permission of Matt.

I followed Matt's build on this transplant from the start with the intentions of building my own 350X/400EX to the point of getting the motor mounts, donor 400EX, and 350X rolling chassis. Long story short, I got side tracked by building a WR450 trike conversion and never built the intended 350X/400EX conversion. I sold off all the parts I had to build the 350X/400EX to fund the WR. After finishing the WR, I decided I still wasn't happy with it for an everday/all day trail machine. The WR is awesome in it's own right, but is just too much for the tighter technical trails I like to ride. This got me thinking about the 350X/400EX conversion again, a few messages back and fourth with Matt and we came to a deal on the sale of this project. About a month later and with the help of Captain Weezy, I was able to get this trike back to Illinois and in my shop. So I'll pick up right where Matt left off on updating the build of this transplant.

I basically got the trike in boxes and have been piecing it together. Since receiving the trike, I've mounted up the carburetor, shortened custom air box (from eBay) and oil tank. I've also installed the oil cooler and ran some temporary rubber oil lines so I can at least get the engine started soon.(I'll be looking into getting some stainless lines made in place of these rubber hoses). I've also been working on getting the brakes installed along with the throttle, cables, levers, chain, etc. My next step will be to run the wiring harness and electrical parts. Once that is complete, I should be at the point of trying to fire it up.

Overall, I don’t plan to change much of this build as Matt already put a lot of time and thought into making it all work together. I’ll just be adding some decals and detailing the engine once it’s a runner and mechanically sound.

So glad to see you updated the thread! (I've been talking to you on Facebook about the reverse cable - I'm Nick Weeks). As for the stainless oil lines, I am also opting that route on mine. I purchased like 20ft of stainless steel braided AN6 on eBay for $25.00, which seems like it is going to fit well. I'm just a bit worried about the steel being a little like sand paper against the frame whenever I have it powder coated.

[BOB MARLIN]

The 350x's are well worth putting the effort in, that's why I have 3 of them.

[67Sport]

Is that a parking brake built into your ASV lever? Any idea what P/N that is? I don't see that setup on their website.

This was a nice build Matt had on the go, glad to see it carry on.

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[captainweezy]

FYI a 350x will fit in the crew cab of a Chevy! Matt and I removed rear swinger, grab bar, pegs and front wheel assembly. It would have fit in the bed but I picked up a couple green bikes for Mr swatland as well. It was an uneventful trip and I was able to buy all my gas under 2$ a gallon so that was a plus.

[Merge_88]

Is that a parking brake built into your ASV lever? Any idea what P/N that is? I don't see that setup on their website.

This was a nice build Matt had on the go, glad to see it carry on.

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That's actually a "hot start" lever like used on some dirt bikes, that particular one is not made by ASV though. It is made by NiceCNC. I'm using it to activate reverse. If you just google hot start levers there will be many to choose from. The trick is finding a cable to use. The stock 400EX reverse cable is too short since it is mounted in the right front fender on the quad. I just so happened to have a twist throttle off a 2005 WR450F that I converted to a trike. I was able to use one of the cables and make it work. For reference, the cable I used measures 45-1/2" long. Hope this helps!

[67Sport]

That's actually a "hot start" lever like used on some dirt bikes, that particular one is not made by ASV though. It is made by NiceCNC. I'm using it to activate reverse. If you just google hot start levers there will be many to choose from. The trick is finding a cable to use. The stock 400EX reverse cable is too short since it is mounted in the right front fender on the quad. I just so happened to have a twist throttle off a 2005 WR450F that I converted to a trike. I was able to use one of the cables and make it work. For reference, the cable I used measures 45-1/2" long. Hope this helps!

Thank you. I’ll look into that.

[Matt85'350x]

That's actually a "hot start" lever like used on some dirt bikes, that particular one is not made by ASV though. It is made by NiceCNC. I'm using it to activate reverse. If you just google hot start levers there will be many to choose from. The trick is finding a cable to use. The stock 400EX reverse cable is too short since it is mounted in the right front fender on the quad. I just so happened to have a twist throttle off a 2005 WR450F that I converted to a trike. I was able to use one of the cables and make it work. For reference, the cable I used measures 45-1/2" long. Hope this helps!

I'm glad you found a cable to work. I ordered a hot start cable off of a kx450f but it too was just too short! You're doing awesome and I'm glad it's coming together for you

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[Merge_88]

Little update:
Over the weekend I was able to run the oil lines and wiring harness, filled her with oil, tapped the starter button and she ran! I was thrilled to hear it fire up, a bit nervous though that the oil would circulate properly. I ran it for quite a while and all seems to be working as Matt had planned. I hope to get some time this weekend to tidy up the wiring harness along with some other small details. I'm waiting on a few other parts to get here but overall she's complete.

[mcgyver331]

is the cad file available?