Fudd
Member
Posts: 1733
MSF RiderCoach
Denham Springs, La.
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« on: November 24, 2011, 06:15:24 PM » |
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The bike has an intermitent miss. It seems to have started after a trip to the car wash. The owner changed the plugs and it maybe helped for a few minutes but not long. Anyway, the old plugs looked fine, with no contamination or cracked insulators.
When it starts to miss, it feels like it is not getting gas to one cylinder. The cycle of "miss, run, miss, run, miss" can happen too fast for me to think it's fuel related. Slowing down to a crawl in high gear until it starts to bogg, and then going wide open throttle seems will cause it to continually miss until releasing some throttle. Then it catches up, it runs smooth and accelerates fast, even when you go wide open.
The owner has removed the two ignition coils and checked the resistance according to the book. All checked out ok. He has run techron in the fuel to ungum the slow jets.
The Suzuki manual suggests to remove the ECM module and have it tested at a stealership.
Anybody have any other suggestions of things to check?
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 Save a horse, ride a Valkyrie |
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The Anvil
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« Reply #1 on: November 24, 2011, 06:26:00 PM » |
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Car wash? Was high pressure water sprayed on the bike? Because that should NEVER happen.
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Boxer rebellion, the Holy Child. They all pay their rent.
But none together can testify to the rhythm of a road well bent.
Saddles and zip codes, passports and gates, the Jones' keep.
In August the water is trickling, in April it's furious deep.
1997 Valk Standard, Red and White.
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Fudd
Member
Posts: 1733
MSF RiderCoach
Denham Springs, La.
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« Reply #2 on: November 24, 2011, 06:28:56 PM » |
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Car wash? Was high pressure water sprayed on the bike? Because that should NEVER happen.
Yes, it was. Too late. Now were do we go from this point? |
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Save a horse, ride a Valkyrie |
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Skinhead
Member
Posts: 8731
J. A. B. O. A.
Troy, MI
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« Reply #3 on: November 24, 2011, 08:02:56 PM » |
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I had a 71 650 yamaha that had a similar miss, only on a hard acceleration just off idle. I checked a lot of things and finally was cleaning the toad dust off of the coils and noticed a crack in one where the dust collected.
Perhaps the water got on a hot coil and cracked it. worth a second look.
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 Troy, MI |
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t-man403
Member
Posts: 1677
Valk-a-maniac
Calgary, Alberta, Canada.
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« Reply #4 on: November 25, 2011, 09:03:42 AM » |
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I highly doubt it's the ECM. If it's a Vol, it's carbed and the gas pump works on vacuum. He should check for cracked vac lines as it sounds like at low rpm he may not have enough vacuum for the pump to work properly. Maybe he got some water in the tank .... put in some gas line anti freeze to absorb any moisture. There is a fuel enhancement knob \ choke, he can use to feed more gas and see if that helps. Tell him to pull it out a notch while riding.
When was the last time he adjusted the valves? Very important!!! Their to be done every 7500 miles.
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"Men are like steel. When they lose their temper, they lose their worth". Chuck Norris
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The Anvil
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« Reply #5 on: November 25, 2011, 09:11:49 AM » |
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Car wash? Was high pressure water sprayed on the bike? Because that should NEVER happen.
Yes, it was. Too late. Now were do we go from this point? You live and learn. if you damaged some electronics with water there's really nothing you can do but replace it. Drain the fuel tank and change the oil as well, pull the plug wires and make sure the tips are dry and spray all wiring harnesses with a dielectric contact cleaner (they displace water). If you didn't actually damage any components then you just might have some water in there causing trouble. Is the Volusia chain drive? If so then be sure and lube the chain. Keep an eye/ear on the bearings (wheel and steering stem) etc. Basically any area that got lube could now be compromised. But it's really the electrics you've gotta worry about. You typically won't force grease out of bearings and pivots unless you get really close with the pressurized water. |
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Logged
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Boxer rebellion, the Holy Child. They all pay their rent.
But none together can testify to the rhythm of a road well bent.
Saddles and zip codes, passports and gates, the Jones' keep.
In August the water is trickling, in April it's furious deep.
1997 Valk Standard, Red and White.
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Hoser
Member
Posts: 5844
child of the sixties VRCC 17899
Auburn, Kansas
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« Reply #6 on: November 25, 2011, 09:13:40 AM » |
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Sorry, I don't know nuthin about V twins, even the metric ones. Hoser
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I don't want a pickle, just wanna ride my motor sickle  [img width=300 height=233]http://i617.photobucket.com/albums/ |
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Fudd
Member
Posts: 1733
MSF RiderCoach
Denham Springs, La.
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« Reply #7 on: November 25, 2011, 02:29:05 PM » |
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FOUND THE PROBLEM
The sparkplug cap on the front cylinder had a hairline crack in it about 1/2" long. Most of the crack was consealed by a rubber boot. When checking the resistance value with an ohm meter the cap checks out OK.
Anvil, just so you can sleep tonite, there's no sign that water ever got anywhere around the plugs, the coils, or any of the electronics under the seat. Seriously, thanks for the suggestions.
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Save a horse, ride a Valkyrie |
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The Anvil
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« Reply #8 on: November 25, 2011, 03:34:06 PM » |
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FOUND THE PROBLEM
The sparkplug cap on the front cylinder had a hairline crack in it about 1/2" long. Most of the crack was consealed by a rubber boot. When checking the resistance value with an ohm meter the cap checks out OK.
Anvil, just so you can sleep tonite, there's no sign that water ever got anywhere around the plugs, the coils, or any of the electronics under the seat. Seriously, thanks for the suggestions.
I'm gonna start calling you Neo because you dodged a bullet!  |
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Logged
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Boxer rebellion, the Holy Child. They all pay their rent.
But none together can testify to the rhythm of a road well bent.
Saddles and zip codes, passports and gates, the Jones' keep.
In August the water is trickling, in April it's furious deep.
1997 Valk Standard, Red and White.
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t-man403
Member
Posts: 1677
Valk-a-maniac
Calgary, Alberta, Canada.
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« Reply #9 on: November 25, 2011, 05:16:21 PM » |
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FOUND THE PROBLEM
The sparkplug cap on the front cylinder had a hairline crack in it about 1/2" long. Most of the crack was consealed by a rubber boot. When checking the resistance value with an ohm meter the cap checks out OK.
Anvil, just so you can sleep tonite, there's no sign that water ever got anywhere around the plugs, the coils, or any of the electronics under the seat. Seriously, thanks for the suggestions. Nice find!! Your buddy posted on the Vol site your discovery as well. Got to like it when a plan comes together!  BTW, I power wash mine all the time and have never had any problems.  |
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"Men are like steel. When they lose their temper, they lose their worth". Chuck Norris
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The Anvil
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« Reply #10 on: November 25, 2011, 05:21:49 PM » |
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BTW, I power wash mine all the time and have never had any problems. And it's still a bad idea. Get s sponge. |
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Logged
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Boxer rebellion, the Holy Child. They all pay their rent.
But none together can testify to the rhythm of a road well bent.
Saddles and zip codes, passports and gates, the Jones' keep.
In August the water is trickling, in April it's furious deep.
1997 Valk Standard, Red and White.
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t-man403
Member
Posts: 1677
Valk-a-maniac
Calgary, Alberta, Canada.
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« Reply #11 on: November 25, 2011, 05:49:42 PM » |
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BTW, I power wash mine all the time and have never had any problems. And it's still a bad idea. Get s sponge. Your probably right! I have basted the Valk for a couple months now as well ..... so far so good. |
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"Men are like steel. When they lose their temper, they lose their worth". Chuck Norris
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The Anvil
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« Reply #12 on: November 25, 2011, 06:40:48 PM » |
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I once found out the hard way that you don't pressure wash motorcycles. Fortunately it was a two stroke motocross bike so the damage was cheap and easy to fix but I shudder to think of what might have happened were it one of my streetbikes.
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Logged
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Boxer rebellion, the Holy Child. They all pay their rent.
But none together can testify to the rhythm of a road well bent.
Saddles and zip codes, passports and gates, the Jones' keep.
In August the water is trickling, in April it's furious deep.
1997 Valk Standard, Red and White.
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t-man403
Member
Posts: 1677
Valk-a-maniac
Calgary, Alberta, Canada.
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« Reply #13 on: November 26, 2011, 11:25:45 AM » |
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Hmm ....... I'm wondering if you didn't just have something fluky happen. I have an old IT250 I still ride every now and then. That bike has been under water  and always needs to be blasted after riding. My buddies have quads that get blasted each and every time we get back from riding. Now my car engine ..... that's another story! |
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"Men are like steel. When they lose their temper, they lose their worth". Chuck Norris
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