Valve springs
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Valve springs
I have a 72 iron head motor in a chopper. It has S&S 4 5/8 stroker fly wheels, 20 over S&S pistons, Andrews Y grind cam, I belevie is has a .425 lift. Runs like a raped ape, but her is the problem. Getting it started, it eats kicker arms, Kicker shafts, right legs, and ankles, electric starters dont last long either, eats the splines right off the shafts. All ways thought that all the parts and knees were just offerings to the speed gods, but then I was talking to a bike builder in daytona he said something about i may have coil bind on my valve springs. Told me to try the stock valve springs. I am curently running .500 lift springs. Is this what is causeing the motor to turn over so hard. I am currently running compression releases to aid in starting
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Joined: Jul 2006
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RE: Valve springs
Hi 72 Chopper,
Lift off the back wheel, get the bike in 4th gear, undo spark plugs and spin rear wheel by hand, you'll then soon find out if you're got some tight spots in there that would indicate coil bind...
On the other hand, most strockers should be fitted with cams that give a lot of inlet closing angle, slow down compression to help starting with kicker. Don't know the Andrews Y grind, maybe it's like that already? Check with Andrews about the degrees ABC for inlet closing... 60 degrees or so should be OK IMO...
Patrick
Lift off the back wheel, get the bike in 4th gear, undo spark plugs and spin rear wheel by hand, you'll then soon find out if you're got some tight spots in there that would indicate coil bind...
On the other hand, most strockers should be fitted with cams that give a lot of inlet closing angle, slow down compression to help starting with kicker. Don't know the Andrews Y grind, maybe it's like that already? Check with Andrews about the degrees ABC for inlet closing... 60 degrees or so should be OK IMO...
Patrick
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Joined: Feb 2008
Posts: 18,575
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From: Norfolk, VA
RE: Valve springs
Instinct says that if your valve springs were binding you would have bent a pushrod or worse by now......just for ***** and grins, check your ignition timing....If it is too far advanced it will be a bear to start even with compression releases......4-5/8" stroke with 3-3/16" bore with +.020" O.S. puts you at 74 CI.....Now that is a SERIOUSIronhead! Not for the faint of heart and one helluva beast to start! Ride On!
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