Curvy running issue.
 

I took the SV out last week and it was running fine but I ran out of petrol pretty much as I turned into my drive when I got back.

Have put some fresh petrol in this morning, it starts and idles at about 1k but if I try and rev it a little it'll go to about 2.5k and then dies if I try it with the choke it wont even start.
When it is idling it feels fine but when I raise the revs it feels quite lumpy like it's running on 1 cylinder

Any ideas?

Re: Running issue
 

Water in fuel?

Re: Running issue
 

i suppose it coud be, what's the best way to sort it?

Re: Running issue
 

Drain carbs until you get clean fuel coming through

Re: Running issue
 

Cool cheers YC i'll dig out the haynes manual so I can see where the drain screw is

Re: Running issue
 

You ridden it with elka shock yet?

Re: Running issue
 

Yeah not with any real purpose if you see what I mean? Only took it out last week for it's MOT.

Feels much better (even with mismatched tyres) especially with the SRAD front end which I 've also done only a hand full fo miles on.

Re: Running issue
 

Are the SRAD forks revalved or stock?

Re: Running issue
 

Standard USD forks but had new seals and oil last year

Re: Running issue
 

I am revalving mine soon. Will let you know how much difference it makes. It is not hard to change.

Re: Running issue
 

Well here we are several months down the line and I still haven't sorted this yet!

Might go out and look at it again in a minute, although I also need to build some shelves in the van this morning

Re: Running issue
 

could have dragged a loada crap through the carbs when it ran out of fuel. Try the water thing though.

Re: Running issue.
 

Could someone do me a picture of where the drain screws are on the carbs please, I've misplaced my Haynes manual at the mo.

Thanks

Re: Running issue.
 

Finally got round to doing this, 1st job was to find my Haynes only took me half an hour!

Got the tank up, airbox off and started to lok for the drain off. Found them and the rear was nice and easy to drain and there was loads of water in it. Then it started to rain of course.
Front one was a right pain to get at it to loosen it off.
Both carbs drained now just waiting for the battery to charge up so I can try starting it! Fingers crossed it works

Re: Running issue.
 

good luck

Re: Running issue.
 

This maybe teaching you to suck eggs so apologies if it is but if there's water in the carbs, there's prob water in the tank and if this is the case then most likely your drain pipe from the filler cap is blocked or the T-piece is blocked. Worth a check.

Re: Running issue.
 

or it could be down to the slightly naff race style petrol cap on it at the mo

Re: Running issue.
 

My SV is running very lumpy this morning, but I have water coming out of the exhaust. I think the last few wet rides have made everything damp inside. Need to take it for a blast and boil off the water. It is amazing that such a tiny amount can have such an effect on the engine.
:D

Re: Running issue.
 

You would find it less amazing and more annoying if it was sat in your carb!

Re: Running issue.
 

Isn't that the truth!

Re: Running issue.
 

Bugger wouldn't start.

Engine turns over but doesn't catch

Re: Running issue.
 

Because carbs are now empty. Try again in a bit, that cranking should have got some fuel into them.

Re: Running issue.
 

Been out and drained more water from the carbs, then it fired up no problem and revved freely.


It then died after a few minutes, had more water in the carbs! Drained them again. Same thing happened again started up ran for a few minutes then died.

So drained the carbs and the tank this time. Drained the tank into a bucket and the petrol looked fairly murky (although the bucket did have some remnants of cement in it to start with). Can still hear a tiny amount of petrol/water in the tank when I shake it around.

Also checked the rubber hose coming of the bottom back of the tank for the water to drain and the drain pipe inside the tank, couldn't see any rust at the top of it and it felt fairly solid when I gave it a good wiggle

Will get some petrol tomorrow and try again

Re: Running issue.
 

After burning petrol, I'd be very worried if you didn't have water (vapour) coming out of your exhaust.

Re: Running issue.
 

It has been a day of adventures today, we put the full power ECU back in and went for a good ride. However the bike was running lumpy to start with. I thought it was just a bit of water making her rough, so we headed off and hit the motorway. On the other side of the Bridge, just about to hit the Welsh Toll and the motor died.

It would not idle and would only run if kept at above 2K on the revs, managed to get to the services and switched off and then watched steam float up from the exhaust and water drip from the can for a further ten minutes.

We then started her up and she was fine, however she was idling at about 1.5K, slightly higher than usual. We carried on going and she just got smoother and more friendly.

A quick shoot around South Wales and then back over the bridge and off to see a friend in Bristol and she still ran smoothly. We stayed at our friends place for a few hours in which time I cuddled her new born baby and cooed at him, while the bike stood outside in the cold.

Time to go home and the bike started with the first push and held her usual idle, then back on the motorway home. It was like this morning had never happened.

I think that she had cobwebs this morning and a lot of water inside somewhere. The steam coming out of the exhaust was a worry for a while, but as soon as it stopped doing that, she was fine. I guess this is why occasional use over the winter is bad, water builds up inside and does not boil off.

A dying motor on the motor way was a moment, thankfully she kept going once we got her started again. I think that I want to live somewhere warm and dry.

Re: Running issue.
 

Draining the tank and carbs has sorted it all out now, not sure if it was bad fuel or water maybe even a combination of both. But it's running nicely now except a bit of popping from the exhaust.

I even changed the rear plug whilst the tank was up, I would've changed the front one as well but could only find the 1 plug in my box of spares hopefully I'll find time to give it an oil anf filter change this week as well

Re: Running issue.
 

Well here we are a year down the line and I've only just properly sorted this problem out. Went to start it a few weeks after draining the carbs etc and it wouldn't start. Didn't have the time or inclination to sort it out at the time. But I've been outthis afternoon and fixed it. Though it might be water in the carbs still as it's been sat in the garage sulking for the past year. Put some wynns dry fuel inthe tank with some fresh petrol. Attempted to drain the carbs to find they're still drained. Turns out the fuel tap wasn't working so a quick strip down and clean up of that (some jelly like stuff in it) and all is running well again.
Now just need to get it insured, mot and tax.

Re: Running issue.
 

Well the story continues...

Finally got it running ok although there was a fair bit of popping and banging last time I was out on it. So this morning I took the tank and airbox off and found this
http://i181.photobucket.com/albums/x...psb8f3a73f.jpg
I would say that would be the cause of the popping.
Was also going to take out the carbs to change the float bowl seals but one of the choke plunger screws is Erm screwed! I knew I should've changed them last time while they were out

Re: Curvy running issue.
 

That collar is fubar'd, drill time DD for the screw (don't mess around with impact drivers etc...) once the heads off you should have just enough screw left to mole grip it off.
Front or rear plunger?

Re: Curvy running issue.
 

The collar has gone back to its original shape.

It's the front plunger screw that's fubarred. Worst thing is I had the carbs off not so long ago and thought about replacing the screws but didn't do it for some reason

Re: Curvy running issue.
 

I'm sure those screws are made of chocolate

Re: Curvy running issue.
 

Hard chocolate
90 minutes it took me and Berlin to remove the front one, off my old carbs

Re: Curvy running issue.
 

Glad I did mine when I changed the choke cables & cleaned the choke plungers

Re: Curvy running issue.
 

Don't do this as a first option.

Having done "a few" of these...

Try screwdriver first
Then you can try some sharp taps on the side of the small plate that retains the choke plunger, this can loosen them on it's own in seconds!
Then impact driver.

Drilling is my absolute last resort here, the carb metal is so soft that if you miss by a fraction then you are proper f***ed.

Re: Curvy running issue.
 

Drilling is always my last resort. Got the carbs off last night so will have a bash at it at some point.

New choke cable on order as it was a bit stiff as well as refurb bits for the fuel tap and float bowl seals for the carbs

Re: Curvy running issue.
 

Erm and while your doing all this to 'your' bike dd dont you have a daughter breathing down your neck ;) ;)

Re: Curvy running issue.
 

Yep, certainly do! I just keep telling her we're waiting for nice new shiney parts :rolleyes:. The PW is pretty much finished now though

Re: Curvy running issue.
 

She will get you back as she grows up the shiney parts just get more and more expensive :) Be nice to see the green machine up and running again good luck with the fixing up.

Re: Curvy running issue.
 

The sv was running albeit a bit badly constantly banging and popping due to me making a mess of fitting the rubber collar things. Yesterday was an attempt to solve that problem but created more in the process of doing that

Re: Curvy running issue.
 

Sounds like my day to day tbh ;) I had the same carb rubber error last time i had mine off doh! Replaced all the cheese screws then apart from two on the front bowl as i ran out sigh so it will all have to come off again at some point just to do those and im bound to nacker something else to do it but thats the fun of diy, stubby fingers and a slow brain ;)