CR500 motor in a ATC250R

[KB]

i want to put my cr500 motor in a 250r 3 wheeler. i know if i search 3wheelerworld.com i could find somethin about it, thought i'd ask here first. my main concern is the kick starter kicking back instesd of forward. i think i read somethin about just cutting the rear fender to allow for it. anybody here done it or know someone that has ? i wish there was a way you could make the cr500 motor kick forward.

[HondaATC]

Your looking at a whole lot of frame mods to use the 85-86 ATC250R frame. Theres 2 ways to go about it. You can hack off the entire bottom of the engine cradle and bend new tubing with enough room for the motor and mounts. Or, you can hack off all the stock motor mounts and beat the bottom frame cradles into oblivion onto the the motor fits in (This has been called "dimpling the frame" but its a whole lot more then a dimple believe me). If you reuse parts of the original engine cradle you also have to remove 2 angle braces that come from the back near the suspension linkage mount towards the front. I don't particularly like the idea of a more powerful engine and a weaker frame, I think a whole new engine cradle is a better idea.

Depending on what your doing with it though, its important to remember and design around the fact that you can't have the frame bottom out on a jump or big bump before the suspension does. Thats bad news, real bad news.

[KB]

Thanks for the reply, you've helped me out. You got me worried about the frame bottoming out though cause I weight about 250.
   How much more does the 500 motor weight than the 250, does the frame bottom out only when you dimple the frame or because of the weight of the 500 motor? also what do you do about the kickstarter ?
                                                                                                     Thanks again.

[HondaATC]

The CR500 engine is taller, and you'll only have the frame bottoming idea if you opt to remove and remake the bottom frame rails to fit the engine, versus bashing in the originals enough from the top for it to fit in. And Really, depending on how low/high you re-do the bottom frame rails you can probably get away with not having that problem. You'll just have to keep that in mind, and check your suspension travel as your working on it. I'm not sure on the exact weight of the CR500 motor. I know the 250R is around 60lbs, plus or minus a few. I'm guessing the CR500 weighs maybe 6-7lbs more. No counterbalancer, much smaller flywheel, and less kickstart gears, but a much larger crankshaft/rod/piston and clutch assembly.

Theres a couple different ways to approach the kick starter. Most people trim the plastics or make a flip up seat arrangement. You have to kind of use a short, small kick starter or it gets in the way of the exhaust pipe. I don't think theres any problems with it clearing the frame after you bend it a little bit. I'm running the original CR500 frame on mine so I don't have any of those problems, but I've got others like speed wobbles and tippieness from the frames high height and long rake out front.

[KB]

HondaATC,
                You should be gettin those stickers today or tomorrow.
                                                                                             Merry Xmas,
                                                                                                                Kelly


 p.s. I'll be calling you for help w/ my project when i get to it. thanks again.

[dnigels]

i want to put my cr500 motor in a 250r 3 wheeler. i know if i search 3wheelerworld.com i could find somethin about it, thought i'd ask here first. my main concern is the kick starter kicking back instesd of forward. i think i read somethin about just cutting the rear fender to allow for it. anybody here done it or know someone that has ? i wish there was a way you could make the cr500 motor kick forward.

You'll put your eye out!

[KB]

i want to put my cr500 motor in a 250r 3 wheeler. i know if i search 3wheelerworld.com i could find somethin about it, thought i'd ask here first. my main concern is the kick starter kicking back instesd of forward. i think i read somethin about just cutting the rear fender to allow for it. anybody here done it or know someone that has ? i wish there was a way you could make the cr500 motor kick forward.

You'll put your eye out!

 Your right, I might dnigels,  Or maybe even someone else w/ the roost it'll boost.

[Young Gun]

Man that thing would haul serious but

[emullen]

Do you need a chassis?
I have one that I was about to part out.

   -also-


as an FYI Saber racing makes a 500cc kit for the 250r bottom end  big$$$ but you may want to check them out if you have a high or limitless budget.

[ATOMCRF450]

From what i have seen and heard you can use the whole dirt bike frame and mod the rest of the suspenshion to fit onto the dirt bike frame. That is supposed to be the easiest way.

[KB]

From what i have seen and heard you can use the whole dirt bike frame and mod the rest of the suspenshion to fit onto the dirt bike frame. That is supposed to be the easiest way.

Thank's, I think that's how HondaATC built his.

[yz3961986]

i got just what you need!!!!!!!   (the best looking fastest one in the south)   waycross georgia

[FoxHondaRider]

I cant imagine how fast that would be!  A cr500 is fast and it spins the tires.  but now you have 2 tires that are wider to spin and get traction.  That has to be the fastest thing around!

[yz3961986]

ATC250R WITH CR500 MOTOR WITH 3MIL CRANK  PACKARD INT. DID THE MOTOR 44MM ELICTRON CARB CUSTOM CPI DRAG PIPE 1-3 OVERRIDE TRANS. HAND SHIFT 4&5TH LONESTAR DRAG AXLE WITH +10 CROME LONESTAR SWING ARM  POLISHED CYLINDER  WITH ALL ALM. RIMS  RUNS 4.20'S WITH 200LB RIDER 300 FEET DIRT DRAGS  WAYCROSS GEORGIA         FOR SALE  $4000.00 FIRM    BEST LOOKING FASTEST ONE IN THE SOUTH!!!!!!!!

[ATOMCRF450]

Any pictures? I know a lot of poeple that like 3 wheelers and might be intrested.

[yz3961986]

give me your email and i will send you some pics

[dynodon]

ATC250R WITH CR500 MOTOR WITH 3MIL CRANK  PACKARD INT. DID THE MOTOR 44MM ELICTRON CARB CUSTOM CPI DRAG PIPE 1-3 OVERRIDE TRANS. HAND SHIFT 4&5TH LONESTAR DRAG AXLE WITH +10 CROME LONESTAR SWING ARM  POLISHED CYLINDER  WITH ALL ALM. RIMS  RUNS 4.20'S WITH 200LB RIDER 300 FEET DIRT DRAGS  WAYCROSS GEORGIA         FOR SALE  $4000.00 FIRM    BEST LOOKING FASTEST ONE IN THE SOUTH!!!!!!!!

If Alex says its NICE, then I would have to say its NICE !!!!!!
Worth a look for that price anyways

[HondaATC]

Heres a couple pics of mine from this weekend up in Indiana. I had it running awesome with the alcohol finally, but I got teamed up with this 900RR conversion thing in my first elimination. I got it off the line, but it of course toasted me from about a 1/4 track on.

http://www.3wheelerworldforums.com/coppermine/displayimage.php?album=lastup&cat=2&pos=3

[yz3961986]

some pics in the forsale form on this web site

[Turboderf]

i am sure it can be done!!! there was a guy that put a cr500 in a quad frame honda 250r 86 that raced ftr last year the thing was fast the beast had a lot of power

[yz3961986]

ALREADY DONE LOOK IN THE FOR SALE FORM ON THIS SITE!!!