Poor Running Engine? (Curvy 99)

[vardypeeps]

Morning.

Just like some suggestions on why my engine might be running poor, it feels like it's running on one and a half cylinders and then will fire fine for a turns and then back to one and a half and so on......

For a note I have yet to check the spark plugs to see if the mixture is incorrect etc but they are quite new (2500miles)

I have recently balanced my carbs and cleaned out the holes where my choke plugers go and they where working freely. Only thing is the rubber o-rings on them looked like they had degraded and had a few cracks in them, could this cause my engine to run poor? Can debris get into the carbs through the choke plungerand block the jets?

Other than that I'm not sure what else could be the problem? My battery is getting old now as I think it's the orginal and the bike has now done 20000miles.

Any suggestions as to what it could be? It's getting annoying and worse now and making the whole bike feel lumpy at all revs as well as putting strain on my drive chain with the power not being as smooth as it should be. :(:(:(:(:( :smt017

[AndyBrad]

check those plugs chap. it will tell all

[thinman]

Been out on the bike today and I'm getting a problem below 4000 revs where the bike pulses forward when I maintain the throttle. Any ideas? (02 curvey)

[vardypeeps]

Your's sounds like it may have a large tight spot in the chain? have you had a look at this?

[Stig]

Been out on the bike today and I'm getting a problem below 4000 revs where the bike pulses forward when I maintain the throttle. Any ideas? (02 curvey)

Stuck choke plungers?

[Stig]

Morning.

Just like some suggestions on why my engine might be running poor, it feels like it's running on one and a half cylinders and then will fire fine for a turns and then back to one and a half and so on......

For a note I have yet to check the spark plugs to see if the mixture is incorrect etc but they are quite new (2500miles)

I have recently balanced my carbs and cleaned out the holes where my choke plugers go and they where working freely. Only thing is the rubber o-rings on them looked like they had degraded and had a few cracks in them, could this cause my engine to run poor? Can debris get into the carbs through the choke plungerand block the jets?

Other than that I'm not sure what else could be the problem? My battery is getting old now as I think it's the orginal and the bike has now done 20000miles.

Any suggestions as to what it could be? It's getting annoying and worse now and making the whole bike feel lumpy at all revs as well as putting strain on my drive chain with the power not being as smooth as it should be. :(:(:(:(:( :smt017

Check the gap on the plugs as well as checking the condition of them. I'd go have another check of those plungers and ensure you have not caused them to stick as part of your reassemble

[thinman]

So after riding yesterday the oil pressure light came on and the bike wouldn't re-start. I've topped the oil up (it def had some in before I rode because the window got black after some running of the engine) but it still won't start. The manual says troubleshoot but I don't know where to begin!

[vardypeeps]

Check the gap on the plugs as well as checking the condition of them. I'd go have another check of those plungers and ensure you have not caused them to stick as part of your reassemble

I will check the gaps when I take them out and go over the plungers again just in case. I'm thinking that maybe since I cleaned the muck off they don't seal as well as they did with it there due to the degrading o-rings.

Also I had to run the petrol tank right down on the weekend due to trying to find a station so it might have pulled through some rust etc?

[vardypeeps]

So after riding yesterday the oil pressure light came on and the bike wouldn't re-start. I've topped the oil up (it def had some in before I rode because the window got black after some running of the engine) but it still won't start. The manual says troubleshoot but I don't know where to begin!

When you say the window got black after some running of the engine was this checked while the engine was running?
Just incase, your oil level should be checked on level ground with the bike upright and not in a paddock stand.

[thinman]

The bike had just stopped when the oil light came on. I was sat a stride the bike and looked down so sort of level?

[vardypeeps]

Just be aware that your oil level will raise up as it falls back to the bottom of the engine when it's not running. Have you maybe checked to see if the oil is over filled?

[Spoon]

So after riding yesterday the oil pressure light came on and the bike wouldn't re-start. I've topped the oil up (it def had some in before I rode because the window got black after some running of the engine) but it still won't start. The manual says troubleshoot but I don't know where to begin!

I think its normal that the oil light comes on after the bike stalls (if thats what happened) however I'm not 100% sure on this as its been a long while since I've stalled my curvy. If it came on when you were riding and the bike then stopped then it could be bad news...

With regards to checking the oil level though as mentioned before you need to do this with the engine stopped, bike level, checking that the oil level is between the top and bottom lines on the sight glass - i'm not sure what you mean by black after running the engine (overfilled maybe?). I think the manual says you need to wait 2 mins or so after stopping the engine to allow the oil to drain back to the sump.

Surging power on constant throttle could be a number of things - in addition to the other advice I've experienced this at 4-5k RPM with constant throttle after having the carbs off to clean the choke plungers (and hitting them with a big hammer to get the screws out) - balancing the carbs sorted this easily.

Finally - with regards to the bike not starting again - more info is needed, i.e. is it totally dead (i.e. nothing when you hit the starter), does it try and turn over but not fire, do you hear a clicking noise e.t.c. e.t.c.