Question about Honda CR 250 R Motorcycles
The ATAC valve you are talking about opens up when certaing RPM's are reached. ATAC Valve consists of a a
ball bearing- ramp system connected to the water pump shaft.
If the ATAC valve is stuck wide open, it is faulty or it is removed you get this kind of problems.
Rev going up suddenly, no idling, etc.
This happens because running at low RPM the expansion chamber doesn't have the right volume and it won't work as it should.
Remove the ATAC valve and try cleaning it, ensuring that it opens and close, or have it replaced.
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Posted on Jun 08, 2009
The butterfly is to help with low end power,the aftermarket pipe you have is mainly for upper rpm power,it will work just fine,but you may notice a loss of lower rpm power.
Posted on May 31, 2009
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Posted on Jan 02, 2017
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