85 and 86 CR250

MaxPower
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2646
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8/15/2006
Location
NJ US
1/13/2017 3:20am
I know cylinders and exhaust valves differ between the 85 and 86 250 Honda. My question is will exhaust pipes swap between years?
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reded
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3685
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3/26/2011
Location
KS US
1/13/2017 3:36am
I doubt it. The '85 model used the ATAC exhaust system where the power valve was a bolt on exhaust chamber. The '86 was updated to the HPP system where the power valves were contained in the cylinder. The exhaust port/flange is a completely different style between the two bikes.
Bent206
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10/1/2016
Location
Coventry, RI US
1/14/2017 4:32am
The pipes are different. See picture 86 bottom- 85 top.

MaxPower
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2646
Joined
8/15/2006
Location
NJ US
1/14/2017 8:32am Edited Date/Time 1/14/2017 8:36am
Thank you for taking the time to post that pic
I imagine the 86 had to make better power with the new power valve over an attac chamber
1/15/2017 7:59am
86 had much wider spread of power almost a electric feel to it. 87 had a tad more hit but very linear as well. 85 think John Deere more of a grunt motor with little up top but stump pulling power down low to mid the signed off.

The Shop

Hudweiser9
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445
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4/8/2014
Location
Ormond Beach, FL US
1/19/2017 2:16pm
I have an '85 CR250. Removed the ATAC, installed a DG pipe / silencer with a special exhaust manifold for bypassing the ATAC system. Runs great, more top than with the ATAC stock pipe setup. I have a Pro Circuit pipe that works with the ATAC, have not tried it.

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