Check with Chuck Vogel, he helped me with spring issue's on my twin when I put it together. He has several spring combo's and retainers that will probably get you where you need to be. I have asked his advise and put my trust in him on many problems and always worked great 217-342-6949
http://vogelmanufacturing.com/
Talked to Chuck Vogel yesterday. he was very helpful, I am going to send him the info below. I finished getting it together today on the stock springs and valves I also measured the stock cam lift ( lobe height - base circle ) = .248 lift
Thanks Chuck (fx28)
Note: .375 lift would be .180" from coil bind I think that i read somewhere that .060" less than coil bind would be max you could go on the lift,
Does that sound about right? This is all only related to the spring, and doesn't take into account the piston to valve clearance.
Valves/Valve springs Kohler CV14-S Single OHV (Stock)
Valve springs
Intake exhaust
Free length 1.917” (1.857”) 2.197” (2.145”) (measured length)
Installed height 1.43” 1.680”
Diameter O/D 1.025” 1.025”
Diameter I/D .765” .765”
Seat Pressure 40 lbs 40 lbs
Open pressure
Open pressure was measured at (.375” lift), 1.055” for intake and 1.305 for exhaust.
Intake Exhaust
80 lbs 80 lbs
Coil Bind Intake Exhaust
.875” .875”
Valves
Intake Exhaust
Head diameter 1.39” 1.246”
Valve stem diameter .275” .275”
Overall length 4.147” 4.153”
Measured camshaft lift with a dial indicator (1.360”-1.128”) = .248” lift
The stock springs sure don't seem very stiff and a .060" shim only brought the seat pressure up by 5#
Am I missing anything?
