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Discussion Starter · #1 ·
hi guys. I wonder if any of you I know why my bike cuts out when doing 80 sometimes but not all the time. it seems to cut power to the fuel pump everything works ok except bike won't 're start.. until left about 10 to 20mins or so.. many thanks guys
john
 

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Shot in the dark, system relay? Swap it with turn signal relay and see what happens...
 

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thanks for the reply. already tried that but it still done it while on the dyno..
You should run data diagnostics while on the dyno to capture serial data events.

The inability to restart is what doesn't make sense. I haven't heard of a "time-out" issue except what's related to the TSM/TSSM/HFSM "tip-over" shut down and this shouldn't occur on a dyno.
 

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Discussion Starter · #5 ·
many thanks for the input. it has done it to me while on the road both times I was doing 80ish and would only restart after left a while.. all electrics seem to work but not fuel pump.. it's strange to me that it's doing it
 

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many thanks for the input. it has done it to me while on the road both times I was doing 80ish and would only restart after left a while.. all electrics seem to work but not fuel pump.. it's strange to me that it's doing it
I can see the 80ish being a symptom of cutting out but catching when it spools back down from lack of fuel flow or psi but time delay makes no sense. Sounds like something in the pump electrical is going open circuit. Doubt it's the pump itself but could be. Here's what I'd do that might help find which it could be. Quite sure you could hook up two wires to a VOM taped to the bars it would show a power interupt. If the bike cuts out the vom will show a voltage drop. If not, the problem is in the pump itself.
Could even be something stupid like the pump fuse having a crack that opens with the right amount of heat internally or around it if it loses B+ during the test. Did you replace it?
Ron
 

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many thanks for the input. it has done it to me while on the road both times I was doing 80ish and would only restart after left a while.. all electrics seem to work but not fuel pump.. it's strange to me that it's doing it
I can see the 80ish being a symptom of cutting out but catching when it spools back down from lack of fuel flow or psi but time delay makes no sense. Sounds like something in the pump electrical is going open circuit. Doubt it's the pump itself but could be. Here's what I'd do that might help find which it could be. Quite sure you could hook up two wires to a VOM taped to the bars it would show a power interupt. If the bike cuts out the vom will show a voltage drop. If not, the problem is in the pump itself.
Could even be something stupid like the pump fuse having a crack that opens with the right amount of heat internally or around it if it loses B+ during the test. Did you replace it? Same could be said for any plugs or wiring itself.
Ron
 

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Discussion Starter · #8 ·
many thanks Ron. I checked the fuses and they seemed ok. I also checked the 3 pin triangular plug and traced the wires down behind the rear cylinder.. the wires felt rough so I pulled it through to look closer and I could see bare wire where it melted from the exhaust.. think it's the vss.. could that cause it ?
john
 

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many thanks Ron. I checked the fuses and they seemed ok. I also checked the 3 pin triangular plug and traced the wires down behind the rear cylinder.. the wires felt rough so I pulled it through to look closer and I could see bare wire where it melted from the exhaust.. think it's the vss.. could that cause it ?
john
I wouldn't think so if just a bare wire not touching anything else. VSS controls speedo, IAC over run function and fuel calculations/level on the gauge. All that is working right? Fix bare wire and retest but my hunch is a power interupt to the pump. That VOM test will show what's up. I would replace the fuel pump fuse, just because it could have a flaw.
Ron
 

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Discussion Starter · #10 ·
ok Ron I think the vss wires were touching the exhaust and it did melt through to bare wire. but I don't want to cut it and 're solder unless I have to. I couldn't find a fuse for fuel pump.. but I may just replace them all and see.. then try the vom test
many thanks
john
 

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ok Ron I think the vss wires were touching the exhaust and it did melt through to bare wire. but I don't want to cut it and 're solder unless I have to. I couldn't find a fuse for fuel pump.. but I may just replace them all and see.. then try the vom test
many thanks
john
Not sure what year your bike is but my 13 it's under the seat. There are also fuses behind the right air inlet near the forks.
Should have a labeling in some form to identify what fuse is what.
Ron
 

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hi guys. I wonder if any of you I know why my bike cuts out when doing 80 sometimes but not all the time. it seems to cut power to the fuel pump everything works ok except bike won't 're start.. until left about 10 to 20mins or so.. many thanks guys
john
Sounds like a fuel pump and also could be coil issue. High speed miss, breaking down under load Check spark plugs and the coil boot where the spring attaches to the coil(s) it self.
 

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Discussion Starter · #13 ·
thanks for the input guys..I haven't ridden the bike again yet but will later to see if it happens now I sorted the bare wires..the bike is.VRSCA model 2002 for info..I will let you all know what it was that caused it..
john
 

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Discussion Starter · #14 ·
hi folks. well I think I have fixed the problem. it was the vss wires touching the exhaust so was killing the engine at 80 I have been for a ride hitting over a 100 and it didn't do it .. many thanks for the advice
john
 

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Discussion Starter · #15 ·
hi again folks. well I thought I had fixed the problem. but now it does it when it's very hot either when the bike is very hot or in the hot weather. so I'm guessing it's electrical as its fine when the bike cools down a bit. it kills power to the fuel pump .. it's a warboro pump and there guaranteed for life. so they must be good. not to say it's not that tho I wonder if the vss has gone bad when it was shorting out..I got another coming in 2weeks time.. what does the vss do ?
vrsca 2002 model..
john
 

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hi again folks. well I thought I had fixed the problem. but now it does it when it's very hot either when the bike is very hot or in the hot weather. so I'm guessing it's electrical as its fine when the bike cools down a bit. it kills power to the fuel pump .. it's a warboro pump and there guaranteed for life. so they must be good. not to say it's not that tho I wonder if the vss has gone bad when it was shorting out..I got another coming in 2weeks time.. what does the vss do ?
vrsca 2002 model..
john
It's primary function is to tell you how fast you are going. A secondary feature it is used likely with speed and rpm to give the IAC steps a bump when closing the throttle at speed, so the idle isn't an abrupt slam back to 1250 or what it's set for. Gives it a hair hang time. If the speedo functions and the coming back to idle from speed doesn't cause the engine to die out slowly, I doubt the issue is the VSS. It's almost starting to sound like the pump itself. Did you ever do that VOM voltage check at the pump connection to see if the power is interrupted when it quits?
Ron
 

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Discussion Starter · #17 ·
hi Ron. maybe it is the pump. if it can get hot. I have a spare brand new pump ..I haven't tried the vom test yet.. guess I'll have to try it
whatever it is heat is a big factor and the bike has been getting very hot as its nearly 30 degrees here
 

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Have you tested the fuel pressure yet? Could be a pin hole leak. Autozone or Advance have fuel line pressure gauges you can borrow free of charge for testing. They screw directly into the throttle body. Takes about 2 minutes to see if you have a leak or not.
 

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Discussion Starter · #19 ·
also I just checked my codes again after seeing another post and recognised the code he has was the same as mine. b1005 is the fuel pump and related wiring is that right ?
john
 

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