SV cut out twice...should I worry?

[hongman]

Just remembered this actually...

On the AR rideout, first leg, was in 2nd gear giving it some beans around 8k rpm and twice it cut out for maybe 2s before it picked back up again.

Happened within minutes of each other. When I say cut out I mean it felt like I rolled off the throttle completely.

Now I have done a fair few hundred more miles, and nothing of the sort since.

Anything to worry about, or anything I should check out just in case?

[andrewsmith]

Was it both cylinders or just the one that cut out?
I would hazard a guess at a spark plug issue but I dont think it that

I definitely check it out as could do it in a situation that could have you off

[hongman]

No idea if it was one or two. Wasnt wet when uit happened btw.

No idea what to check to be honest.

[andrewsmith]

thinking about it, there could be a few things that could cause it

edit: you run the bike on super expensive or regular unleaded?
- Spark Plug: Tbh it would be v. obvious and the bike would rough running
- Loose HT lead
- Faulty alternator
- Loose battery connection

all could be causes and could not be.

i would consider giving it to a mechanic if your concerned

[hongman]

I normally use normal unleaded, but I did fill up with super at one point (cant remember when), becuase I pulled up at a pump that only had super.

Bike runs fine as far as I can tell. And I have covered lots of miles since, and it hasnt happened again. I'll give the bike a quick once over tomorrow, if it happens again I'll revisit.

Cheers buddy

[yorkie_chris]

You don't need expensive petrol.
Did I pass you at any point on the ride? If so, did that look like a bike that has had the living b*llocks battered out of it for 75000 miles on the cheapest fuel you can get? It should.

Were the clocks going mental when it happened? Loss of rev counter signal? Loss of all electrical power?

[hongman]

Hi YC

I know I dont need expensive petrol - as above, I only filled up with super once becuase I couldnt be bothered to find a pump that had normal.

You probably did pass me, but I can only recognise a handful of bikes! ;)

I didnt notice if the clocks went mad or not, it all happened so quick...I think I remember seeing the rev counter needle dropping for those 2s it lost power, but I'm afraid I'm not even too sure on that.

[Sid Squid]

Unless it keeps doing it, no, don't worry.

Is it running OK now? If yes then come back and ask again when there's a problem to find.

[Mr Speirs]

Mine did that once. Totally bizarre.
Pulled into a side road and Binky asks me why we have stopped.
I tell him my bike has cut out!!
He gives me a funny look and I look down at my bike and it's working perfectly and had fired back up just before I stopped.
Oh well and carried on.

[Rob969]

Could the side stand switch cause this?

[yorkie_chris]

Unless it keeps doing it, no, don't worry.

Is it running OK now? If yes then come back and ask again when there's a problem to find.

Possibly dangerous fault IMO. I would have general check over bike, maybe it is something obvious and easy to fix now before it decides to cut out mid-corner and punt you off!

[hongman]

I'm inclined to just forget it but a bit of me does keep wondering YC's scenario, lol.

Sidestand is fine as far as I know, no problems before - was a smooth bit of road, wasnt going over any bumps at the time. Been over a few big bumps since (speed humps) and no problem.

Doot doot doot...

[sv4me]

I've been having what sounds like the same problem :smt013

Just got my curvy back in 1 piece and on the road. was fine for a few rides then went to start it and the dash wouldnt light up, no juice at all. I turned the bars a few times and the power came back on and fired up no problem. Had 1 trouble free ride then yesterday it was cutting out on the throttle, and making an almighty feckin bang with it! Could easily have me off so i'm sorting it

I'll check the basics like the plugs but i'm guessing its a faulty ht lead like a few people have found on here. I'll let you know what I find out hongman

[hongman]

Ok thanks, although my problem doesnt seem as severe as yours.

Hope you get it sorted!

[independentphoto]

SV4ME - sounds like you need to have a real close look at your wiring looms around the headstock and under the tank just to make sure that theres no damage there. Also check the wiring specifically around the ignition barrel and the kill switch. Check their contacts too for green fur or similar. Good luck with this.

Garry

[Milky Bar Kid]

My SV did this once. Completely randomly and then never did it again!

[hongman]

My SV did this once. Completely randomly and then never did it again!

Lets hope this is the case with me!

As I said, happened at the beginning of the rideout, hasnt done it since.

Touch my wood.

[warrenhewitt10]

The sv with the bars wiggling, mine did this, turned out to be a dodgy connection in the big green ignition wire connector block down in front of the air box. As for the cutting out problem it sounds very very similar to what mine does when the tps starts messing around, just stops for no reason then is ok again.

[RobH13]

When i first got my curvy, i had loads of niggles with it, had done all the cleaning of contacts etc, the only thing that did eventually require replacing was the Reg/Rec....

I'm not technically minded and can't say if this is the problem, but mine did cut out the odd time and ever since the reg/rec was replaced it's been fine.

Rob.

[hongman]

Ah, should of mentioned this - my r/r had already been replaced with a gsxr one when I bought it. I guess it *could* be having issues again though.

Gonna give it a good going over this weekend hopefully.

[-Ralph-]

My XT did it about 5 mins into the AR rideout. Just wrenched round the twistgrip and given it full throttle for a overtake (not unusual behaviour on a 43bhp single), on full throttle and the power died away, initially thought the throttle cable had snapped. I coasted to the bottom of the hill, tried the throttle again - nothing, and pulled in the clutch the revs dropped straight down to zero and the engine died. Coasted to a stop and tried to restart it, no response from the starter motor. Did all the usual checks, neutral, ignition off and back on, killswitch off and back on, look at the sidestand (Yahama's don't need the clutch in), still nothing. Try the indicators and realise I've got no power at all. Off the bike, helmet off, gloves off, just about to reach for the toolkit to pull the sidecover off and look at the battery and Luckypants pulls up. "What's the matter?", "Completely dead no electrics at all, look", switch on the ignition, "Well you've got lights now", "Oh!", press the starter button and the bike fires :smt102

Never done it before, hasn't done it since. I'm going to clean, grease and re-tighten all the battery connections, as the bike does go off road and get wet and dirty.

Other than that I've no idea what it could be, but I know how you feel, in that if you don't know what it is, you never know when it is going to do it again.

In your case it could be as simple as a slight sticking fault or moisture in your kill switch or sidestand switch, or as people have said it could be a spark plug or a coil on it's way out. It doesn't need to be raining for you to have moisture problems, did you wash it before the AR? Bikes can even suffer from damp & condensation from being sat in the garage, but that's usually a winter thing. I used to live in one of the wettest parts of Central Scotland, and I could go out to the garage and find the whole bike as wet as a single glazed window on a winter morning, but the garage was dry but a detached prefabricated concrete unheated building, it's just because the atmosphere was so damp. I used to chamois leather off the bike, then have to do it again the next day.

Some breakdown cover will give you peace of mind if you are worried about it happening again.

[hongman]

Thanks Ralph.

In answer to your questions:

Havent washed the bike at all since I've had it (shhhh)
I did ride in torrential rain a few days ago, but I would have thought it would have dried off by then - esp with the long ride up to the AR and everything getting very hot!

I got breakdown cover for the AR, but I'm a little concerned it'll do it just at the wrong time (i.e...hot into a corner)

I'll give everything a once over, but I have a feeling I'll never get to the bottom of this lol.

[-Ralph-]

I did ride in torrential rain a few days ago, but I would have thought it would have dried off by then - esp with the long ride up to the AR and everything getting very hot!

It could still be moisture getting in, in fact if in torrential rain, especially when there is a lot of spray from other vehicles, it's quite likely. Your side stand and kill switches don't get hot.

[Sid Squid]

The possible reasons suggested in this thread include reg/rec, (see my sig), ignition switch, and TPS, (but that's stunningly unlikely as you have a carbed bike, and that's more important with FI bikes).

Maybe your bike was a bit cold when it happened, perhaps you fluffed a change, I don't know and it doesn't, (right now), matter. Only you can answer these and I'm not sure that in your self confessedly little experience there aren't other, perhaps very important, factors that you did not relate.

Whatever, you're still looking for a problem that doesn't, right now, exist.

Good luck.

Like I said; if it does it again, give us more detail and I'm quite certain you'll be offered a hundred more irrelevant causes and prophecies of doom and maybe, just maybe, some sensible suggestions as what - if anything - is amiss.

Stop worrying.

[Messie]

The possible reasons suggested in this thread include reg/rec, (see my sig), ignition switch, and TPS, (but that's stunningly unlikely as you have a carbed bike, and that's more important with FI bikes).

Maybe your bike was a bit cold when it happened, perhaps you fluffed a change, I don't know and it doesn't, (right now), matter. Only you can answer these and I'm not sure that in your self confessedly little experience there aren't other, perhaps very important, factors that you did not relate.

Whatever, you're still looking for a problem that doesn't, right now, exist.

Good luck.

Like I said; if it does it again, give us more detail and I'm quite certain you'll be offered a hundred more irrelevant causes and prophecies of doom and maybe, just maybe, some sensible suggestions as what - if anything - is amiss.

Stop worrying.


Hong - this man speaks sense. Listen to him and follow his advice!

[yorkie_chris]

TPS, (but that's stunningly unlikely as you have a carbed bike, and that's more important with FI bikes).

The carbys are fine without any TPS connection at all.

[-Ralph-]

That's good advice, Specialone said to me on Saturday afternoon after the rideout, are you not going to look at your battery connection now? I said no, it's been fine the rest of the rideout, I can't be ar$ed right now 'cos I just got my tent up and I want to drink beer, and I have breakdown cover in case it does it on the way home tomorrow.

I know Sid Squid is not actually saying ignore the problem completely, but it could be read that way and that wouldn't be good advice, he is saying don't WORRY about it! It would still be recommended by any sensible person giving the bike a once over whenever you get a spare 1/2 hour, next weekend, whenever, checking cables are secure, sidestand switch not sticking, a bit of lubrication here and there if needed. It's something you should be doing periodically anyway as part of maintaining your bike and anyone saying you shouldn't be looking over your bike from time to time needs to be stood up and shot, but if you don't find anything amiss don't worry about it.

[hongman]

Sorry :s Natural born worryer, me.

I'll just wait 'n see.

[Sid Squid]

The carbys are fine without any TPS connection at all.
Correct.