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**Grumpy old man** · 02-09-2016, 10:10 PM

Air flow from increased rpm's opens it further , you should be able to turn it easily when cold by hand using a light grasp .

02-09-2016, 10:10 PM	#2
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Heat Riser - Before I burn a valve... Air flow from increased rpm's opens it further , you should be able to turn it easily when cold by hand using a light grasp .