2007 street bob starts very hard
#23
Straight out of the repair manual, but this doesn't mention "when hot":
11. Valves sticking.
Starts Hard
1. Spark plugs in bad condition or have improper gap or are
partially fouled.
2. Spark plug cables in bad condition.
3. Battery nearly discharged.
4. Loose wire connection at one of the battery terminals, coil
or ECM connector.
5. Water or dirt in fuel system.
6. Intake air leak.
7. Fuel tank vent hose and vapor valve plugged.
8. Engine lubricant too heavy (winter operation).
NOTE
For cold weather starts, always disengage clutch.
9. Ignition not functioning properly (possible sensor failure).
10. Faulty ignition coil.
1. Spark plugs in bad condition or have improper gap or are
partially fouled.
2. Spark plug cables in bad condition.
3. Battery nearly discharged.
4. Loose wire connection at one of the battery terminals, coil
or ECM connector.
5. Water or dirt in fuel system.
6. Intake air leak.
7. Fuel tank vent hose and vapor valve plugged.
8. Engine lubricant too heavy (winter operation).
NOTE
For cold weather starts, always disengage clutch.
9. Ignition not functioning properly (possible sensor failure).
10. Faulty ignition coil.
11. Valves sticking.
#24
I have a 2008 CVO Road King with the same problem, starts hard when hot and sometimes sounds like metal on metal and grinding. I was told that it was electrical, checked connections, and even went ahead and replaced the battery as mine was at the 5 year mark. The problem has been getting worse, and sometimes takes a few minutes to get it to fire up. I also get a cough and plume of smoke out my air intake (recently installed heavy breather) when trying to start sometimes, and there is a little bit of oil getting spit up in to the air filter. I change the oil and check the level regularly and keep it at the low end of the dip stick, but still in the good range. I was told by a couple of dealers that both issues were just normal, but the hard starting has been getting much worse. I don't know if the issues are related, but I will try some of the suggestions previously posted. If anyone has any other suggestions, then I am all ears. Thanks.
#25
#26
I know I need a replacement battery, and need to install the new spark plugs also but with my Power Commander V I was given a solution that works for me. When the bike is cold, as in first ride of the day, turn on, hit run to let fuel pump prime then hit start just like is says in the manual. Other than that I never let my fuel pump prime. Basically when I hit run, I hit start right after and do not let the fuel pump prime. If I remember correctly with the map I am running I do not need as much fuel at start so I don't let the pump prime. When I do, I get the horrible grinding, clunking hard starting sounds described here. It's worth a try and won't you cost a thing.
#27
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PAUL MUSSO
Ignition/Tuner/ECM/Fuel Injection
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07-11-2012 10:39 AM