1986/87 cr 250 cylinder differences

DynoDan22
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775
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9/7/2011
Location
Victorville, CA US
DynoDan22 2/28/2015 9:26pm
2/28/2015 9:26pm
The '87 cylinder has the rear boost port directly opposite the exhaust port. The '87 case also has the lead port for this boost port and the difference can be seen in the main case gasket. All of my '87 cylinders had the "E" letter on the intake manifold, but this only denotes the mold # for that given year. The power valves are slightly different between the two years. I personally liked the '87 motor over the '86 so I would stick with the '87 cylinder if you have the matching '87 bottom end.
ZOOK250
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221
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9/17/2010
Location
Oakbank,Mb CA
ZOOK250 3/1/2015 9:35am
3/1/2015 9:35am
Great thanks Dan. The bottom end has the boost port like you described. The guy I bought the bike from included an 86 cylinder, he probably thought it was an 87. Good thing I bought another 87 cylinder from another Vital member. I thought it would be good to have a spare. Anyone looking for a good 86 cr 250 cylinder?

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