Question about Harley Davidson FXDBI Street Bob Motorcycles

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2007 street bob bike starts hard after a few starts and it warms up sounds like grinding had to replace pinon gear and ring gear because they got chewed up then starter clutch then put new battery now bike is doing it again

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I'm not going to tell you that what I'm about to say is going to solve your problems but it sounds like the starter motor is starting to spin before the jackshaft (pinion gear) is engaged with the ring gear. On the backside of your starter is a 5-sided plate held on by three 3mm screws. Remove this plate and you'll see the solenoid plunger and spring behind it. You can take these out. You'll see two large copper contacts in the solenoid. If these contacts are not flat but turned a bit, the plunger will make contact and start the starter motor spinning before the jackshaft is all the way out and engaged fully with the ring gear. Disconnect the battery and then loosen the nut that holds the battery cable to the starter solenoid. Push back on the copper contact strip until it's flat against the backside of the solenoid. Do the same with the contact that goes to the starter motor. Replace the plunger and spring and the end plate. Reconnect the battery. Maybe this will help but it is a long shot. The only other thing that I can think of is a misalignment of the outer primary cover causing a bind in the jackshaft and preventing it from coming out and engaging the ring gear properly.

Good Luck
Steve

Posted on May 23, 2011

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Well, I would suggest to get faster to a Dealer in order to check out the Primary chain case ,verify the clutch basket , also check for the starter motor...Who did the first issue???

Posted on May 23, 2011

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Posted on Jan 02, 2017

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Hello Anonymous...

To inspect the teeth on the ring gear requires the inspection to check the full 360 degrees of the ring gear. Looking past the inspection cover to examine a small portion of the ring gear may reveal no issues, but only for that section. Eventually the ring gear will end up positioned above the starter drive gear which will skip across the bad teeth creating your grinding noise when you try and start the Astro,.

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Grind at 19 mph in primary


I would think that if the noise was being made by your transmission, it would start whenever you put the transmission in second gear and continue until you shifted to another gear, not at 19 mph only.

This sounds like a vibration that is specific to the engine rpm at that speed. It may sound like a grind but may actually be a vibration noise. Try to recreate the noise with the bike sitting still in neutral. Be careful not to allow the engine to overheat though.

Try other things to help you narrow down the source of the sound. When it starts, gently touch the brakes while maintaining the speed to try to eliminate the brakes. Does the noise change if you accellerated slightly or back off the throttle slightly.

It's very unusual for a transmission to make a noise in only one gear. I've found that if a transmission is making a noise, it makes the noise all the time but maybe louder at some speeds than others.

Good Luck
Steve

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1 Answer

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If it does it only when the tank is stating to get low, you have a hole in the fuel line, which should be covered under warranty. listen to the tank when the level is low. If it sounds like water being sprayed in the tank, then more than likely that's your problem, The problem won't generally present itself when the tank is full, because the gas helps cover the hole in the line keeping the pressure higher than when it's low on fuel.

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