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Author Topic: Help me identify this engine builder  (Read 7235 times)

Offline The norm

Help me identify this engine builder
« on: June 24, 2017, 07:24:50 PM »
A buddy just bought an 86 ATC250R for $500. It has a marking on the cylinder and I would like to find out who made it. The bike was originally bought in Oregon and the 2nd owner moved it to California. Thanks second owner is who my buddy bought it from. He said he bought it in Portland in the 90's and he never touched the motor. Any help is appreciated, Loren
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1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Online croat1

Re: Help me identify this engine builder
« Reply #1 on: June 25, 2017, 02:48:18 AM »
CW Racing Engines. Campbell, California

Joe
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A few Laegers
1987 oem
2025 Yamaha Raptor 700R
Mission: Back to Basics.  On the trail or dune

Offline The norm

Re: Help me identify this engine builder
« Reply #2 on: June 25, 2017, 12:38:51 PM »

CW Racing Engines. Campbell, California

Joe


I wonder if they left a way to know what porting the cylinder got? Kind of silly, it has stock exhaust and air box, but a ported cylinder
Logged
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Online croat1

Re: Help me identify this engine builder
« Reply #3 on: December 26, 2024, 04:43:47 PM »
Old thread but CW rRacung is still in business.

Find them on FB or Instagram.  I don’t see a website.

Joe

Logged
A few Laegers
1987 oem
2025 Yamaha Raptor 700R
Mission: Back to Basics.  On the trail or dune

Online croat1

Re: Help me identify this engine builder
« Reply #4 on: August 27, 2025, 09:19:21 AM »
Still in business

Logged
A few Laegers
1987 oem
2025 Yamaha Raptor 700R
Mission: Back to Basics.  On the trail or dune

Offline The norm

Re: Help me identify this engine builder
« Reply #5 on: August 27, 2025, 07:56:57 PM »
A few years ago I had Pete look at the porting and he said it was pretty good. I know it pulled pretty hard and was a bit better after I bumped the compression up.
Logged
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)
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