Official Atc 480r Build

[Williejamehufff]

Hey guys. I've finally uploaded the pics of the start of my 2nd gen 480r build. First off I'm using a 1984 Atc 250r frame. I'm swapping out the motor and using a 1982 Cr480r motor. This is the 4 speed version of the 480's(supposedly more torque). The engine is basically completely new. I've gone through it completely and replaced almost everything, crosshatching, reeds, reed cage, etc. Custom +5 swingarm. 1 inch spacers on the axle.

[Dirtcrasher]

Thats great work!! Awesome design and TIG welding on the swinger!! What did you have to clear on the left side?? Allot of torque to that rear axle!

That motor has a serious light switch power band hit, so hang on!

Thanks for all the pics!!

DC

[6speedthumper]

I agree with DC, superb work on that super custom swinger! Keep this thread up, bud! I wanna see her progression to completion!

[ColtonGG33]

Lookin good! Can't wait to see it all done! That motor 480 motor is huge compared to that 250 lol

[slashfan7964]

Nice work!!

[Gripit'n'ripit]

That is going to be one ANGRY wheeler. A destructive three wheeled force. Thanks for the pics!

[M.Pargiello]

Love it, great build!

[Williejamehufff]

I didn't have to clear much since I'm going to leave an open air box. I'm going to have to come up with some sort of foam sponge for when I go to the dunes with it. But other than that clearance issues haven't come up yet.................





Thats great work!! Awesome design and TIG welding on the swinger!! What did you have to clear on the left side?? Allot of torque to that rear axle!

That motor has a serious light switch power band hit, so hang on!

Thanks for all the pics!!


I didn't have to clear much since I'm going to leave an open air box. I'm going to have to come up with some sort of foam sponge for when I go to the dunes with it. But other than that clearance issues haven't come up yet.................

DC

[Williejamehufff]

180313180314180315180316180317I've got some exciting news for the build. When using an '82 Cr480 rear motor mount. The 250r frame accepts the mount as a direct bolt in with the rear and bottom mount. I'm going to have to hog out the center a little bit so the center mount will slide in without hammering. Instead of fabricating a blend of the 250r frame mount and 480 mount I can just weld on a bracket for the rear shock. The only concern is the front sprocket clearance with the swingarm. I think it will work but it will be tight.

[Williejamehufff]

180577180578180580180579Made carboard temp. of the mounts that will bolt into the bottom and top mounts of the Cr480 using 1/4 in steel.

[Williejamehufff]

I will be shaving off the existing shock mount. the only mount will be to the engine and bottom mount

[JasonB]

freaking awesome build man! That swinger is a thing of pure BEAUTY! looking forward to your finished 480R!!!!

[Williejamehufff]

Thanks so much. Btw who made your pipe?
freaking awesome build man! That swinger is a thing of pure BEAUTY! looking forward to your finished 480R!!!!

[Williejamehufff]

Does anyone have experience with the 480r head? should I make a decompression head

[JasonB]

That pipe was for the 310 big bore 250r, came through nos_350x. custom sectional pipe, i love it!

and on the decomp, i asked the guy doing my engine work if he could do a decomp on an aircooled motor and he said no problem! I am PM'd you his cell phone number, text or call him to see about details and cost but he did my decomp on my 500 and his welds are beautiful

[oscarmayer]

good looking build sir.
i do have one thought, it appears the engine is "leaning" forward, i am concerned this may cause an oiling issue with the bottom end. i was wondering if there was a way to correct the slight forward leaning angle or is that how it is supposed to be?

[Williejamehufff]

There's two sets of pictures. One with the engine just laying in the frame and the other where it's bolted up. The second should be fairly upright. I don't see any issues with the case. More than likely the front end will be in the air so that should compensate it. Haha

[Williejamehufff]

got the new carb on 181502181503181504181505

[joesouth]

Nice to see a big air cooled motor used, a little different than the liquid cooled versions.

[Williejamehufff]

Thanks I appreciate it. Hopefully it will be one of a kind. I've never seen a completed 480 big bore in a 2nd gen
Nice to see a big air cooled motor used, a little different than the liquid cooled versions.