CR500 Engine + 250R Frame

**Paysts** · 08-05-2006, 06:06 PM

I would like to put a CR500 engine in to my 85 250R. Is this hard to do? The engine in my 85 250R is toast.

Also, what are some good years for the CR500 engine?

Post away. Thanks.

**Louis Mielke** · 08-05-2006, 09:37 PM

several people here have done it. lotsa work. lotsa welding. unless you're a balls to the walls kinda rider just rebuild your 250 engine. You'll be surpised how well your 250 will run with afresh rebuild.

**Yamaha Tri-Moto** · 08-05-2006, 10:36 PM

Agreed, lots of work. But it would be real fast.

**200x Basket** · 08-05-2006, 10:47 PM

i did it and love it. but it is not a good trials machine

**Orangecnty250r** · 08-06-2006, 12:06 AM

Thats one machine I've always wanted to do...I have to many projects going right now but maybe someday I'll tackle this one...My dream is to have it look like a 100% original 1986 ATC with the 500 motor painted the proper dark silver and Harlans atc 500 factory looking decals on it. Thats a dream machine for sure.......good luck with your project

**Aussieduner** · 08-06-2006, 01:30 AM

Originally Posted by 200x Basket

i did it and love it. but it is not a good trials machine

I love your 500r its one of my favorite trikes !

Aussie

**atcsteve** · 08-06-2006, 12:31 PM

One major problem is the vibration from the cr 500 motor,what a pain in the butt.They are fast,but my built 250r's will outrun a semi stock cr 500 all day long,with less problems!!There is a reason honda didnt put these in trikes!!

**gasmask** · 08-06-2006, 03:31 PM

do a search of 500r on here and 3wheeler.org. a few people on here has do it. basket and kasey i know for sure. basket show you step by step the process. i bought his first 250r/500 frame and only had one problem. that was 3 yrs ago. i reinforced the frame under the motor and that's all she wrote. no more problems...i believe kasey also has a step by step process. check both site and then make your decission. it's a fun ride but it will hurt you...

**KASEY** · 08-06-2006, 04:27 PM

One major problem is the vibration from the cr 500 motor,what a pain in the butt.They are fast,but my built 250r's will outrun a semi stock cr 500 all day long,with less problems!!There is a reason honda didnt put these in trikes!!

i wish i had a nickel for everytime i saw this,,,,,, DON'T BELIEVE IT FOR A MINUTE!!!!!! OH BY THE WAY STEVE they did have a ATC500R prototype in the works,,, and i would say it might have been on the dealers show room floor in 88 if things were different,,,,

**Louis Mielke** · 08-06-2006, 07:01 PM

Originally Posted by atcsteve

One major problem is the vibration from the cr 500 motor,what a pain in the butt.They are fast,but my built 250r's will outrun a semi stock cr 500 all day long,with less problems!!There is a reason honda didnt put these in trikes!!

Dude are you for real? My 500 vibration is barely noticable. Only after riding for several hrs are my hands even slightly sore.

I would be carefull what you say dude. I'm pretty sure you can no longer count the number of people with 500s on these boards with just one hand anymore.

**hoser** · 08-06-2006, 07:53 PM

Here you go 98 hp
http://www.cpindinc.com/products/hon.../TRX510R.html#

**Billy Golightly** · 08-06-2006, 09:04 PM

There is only one way in my opinon (take for what its worth

) to do this conversion correctly. Its not using the dirtbike frame like I did, or using the 250R frame. Its to make a whole new one specificly for what your trying to do. No matter how much you mod the 250R frame to fit the 500, or the 500 frame to be a trike, your still trying to change it from one thing to another and it will never be as good as something purpose built. The 250R frame conversions have the potential (although low) for stress and breakage due to the removal of two of the lower frame rail supports. The 500 frame conversions are tall, raked out to far, and wobbly although less likely of a failure...

You have 3 options, pretty much. Take your pick.

**Louis Mielke** · 08-06-2006, 09:59 PM

Originally Posted by Billy Golightly

There is only one way in my opinon (take for what its worth

) to do this conversion correctly. Its not using the dirtbike frame like I did, or using the 250R frame. Its to make a whole new one specificly for what your trying to do. No matter how much you mod the 250R frame to fit the 500, or the 500 frame to be a trike, your still trying to change it from one thing to another and it will never be as good as something purpose built. The 250R frame conversions have the potential (although low) for stress and breakage due to the removal of two of the lower frame rail supports. The 500 frame conversions are tall, raked out to far, and wobbly although less likely of a failure...

You have 3 options, pretty much. Take your pick.

Amen! Now get back to work, who said you could get on the internet? We need that aluminum prototype done!

**3Razors** · 08-06-2006, 09:59 PM

Originally Posted by atcsteve

One major problem is the vibration from the cr 500 motor,what a pain in the butt.They are fast,but my built 250r's will outrun a semi stock cr 500 all day long,with less problems!!There is a reason honda didnt put these in trikes!!

Im calling BS on this one. Wrong on both ends buddy. The vibration in a 3 wheeler is very minimal. It will take much more than your 250r with a 310 kit run down even a stock cr500. And as far as reliability?!! The cr500 motor is one of the most well built motors ever! It is stone ax reliable that can take lots of abuse.

**Billy Golightly** · 08-06-2006, 10:13 PM

Originally Posted by Louis Mielke

Amen! Now get back to work, who said you could get on the internet? We need that aluminum prototype done!

Aluminum is in the shop and am jigging up the welding table

Billy=

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CR500 Engine + 250R Frame