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  #1 (permalink)  
Old 09-30-2017, 03:57 PM
STEINBVG's Avatar
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Location: ATLANTIC CITY, NJ
Bike Year, Make, Engine: 2010-14; MYSELF; 96",113",120",127"
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Compression release valve modification

It appears that regular manual compression release valves, (nock offs from chain saw valves )may be ' spitting out' too soon to be effective in big cubic inch motors during start.

I hear people hold them down to get momentum, use some improvised holders etc.
I disassembled mine and discovered the problem that can be easily fixed

There 3 balls under springs hold the piston against the groove in the sealed position . But in the open position, the balls simply hold the shaft without any groove.
Therefore there,s a little resistance to hold it open.
I simply machined a tiny shallow groove on the shaft where the balls would rest in open position.( approximately in the middle between the main groove and the top groove designed for blue handle.)
Because I had cut the tin cover that held the balls / springs assembly in place, I used a hose compression spring clamp of right size to reassemble the unit.( somebody might come up with a better design)

Instead of blue handle, I just used a snap ring. Also I filed 2 flats on the body( for 9 mm wrench) , because it,s tough to use the existing hex with the Ultima- it,s in a deep inaccessible niche .

If I was ordering chain saw valves for bikes , I would rather use McCullough ones, quite rare. I think they are designed better.
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  #2 (permalink)  
Old 10-01-2017, 04:51 PM
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Nice innovation..always welcomed..
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  #3 (permalink)  
Old 10-02-2017, 04:47 PM
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so the McCullough release valves have same thread as what is in our big twin heads?
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