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Old 15-01-2008, 08:07 PM
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Default Running odd

The Stubborn B*tch is running badly and I am not sure if I know why...

I ended up not using her for nearly a month, so Sunday I took her out and ran the old fuel through, and filled up with a tank of V power (apparently Optimax is no more). Ran some of it through on the way back from Nottingham on a good fast run, and then ran it to work and back yesterday, was fine this morning, but today on the way home from work she was not in a good mood! Ran her with the choke til she warmed up, reduced it down as usual, was idling fine, then just coughed and gave up (this does happen sometimes).

She coughed and spluttered all the way home, and when i stopped at lights she just died every time. There was a bit of a funny smell at one point but nothing i could identify...

Any chance this could just be crap from the old petrol and it'll cure itself or does it sound like it could be anything worse?
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Old 15-01-2008, 08:18 PM
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Might be dirty plugs, Kylie. Take them out, give them a good clean and check they are gapped properly. try running the bike again and if its still coughing then it might either need new plugs or the carbs might need balancing. Do the easy stuff first.
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Old 15-01-2008, 08:20 PM
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Plugs were new in September - Andy changed them when he serviced it.

Balancing the carbs goes back to a previous problem.....
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Old 15-01-2008, 08:28 PM
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And when was the last time you gave it a damn good thrashing?
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Old 15-01-2008, 08:31 PM
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how long was the old fuel in there? could be water (moisture) from the tank gone thru to the carbs...
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Old 15-01-2008, 08:32 PM
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Thrashing on Sunday/Monday

Fuel goes through the tank roughly every 10 days, and tank was nearly full so most it would be would be 5 weeks the old fuel was in there - enough to upset my bike, but surely not that much.
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Old 15-01-2008, 08:35 PM
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could be bad fuel at the last fill up then? seems strange to run ok then start playing up soon after filling up! (im going for the easy fix 1st - )
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Old 15-01-2008, 08:36 PM
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Quote:
Originally Posted by v8_trike
could be bad fuel at the last fill up then? seems strange to run ok then start playing up soon after filling up! (im going for the easy fix 1st - )
She got half way through the tank before playing up, and it was expensive stuff in the hope it might just help her forgive me for not riding her over xmas
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Old 15-01-2008, 08:43 PM
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ok then, the funny smell - electrical burning or oily overheating type smell,
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Old 15-01-2008, 09:09 PM
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Quote:
Originally Posted by v8_trike
ok then, the funny smell - electrical burning or oily overheating type smell,
Pass... wierd and almost possibly of rubber but that was only a slight hint, and i'm not 100% sure it was there or that it was even me (lots of cars about)
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Old 15-01-2008, 09:13 PM
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Do the plugs have an R in the plug number?
If they do then they have a resistor built into them and it can break down under load and give a rough run. I would change for similar but without a resistor
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Old 15-01-2008, 09:28 PM
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check your tank is breathing properly. ie if it packs up, open the tank listen for a hiss as you do, it could be vapour locking. if so look for the lil hole in the rubber seal and blow it clean ,you know how to blow baby dont ya, you just put your lips together and .................. whoopes distracted, but you get the idea.
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Old 15-01-2008, 09:48 PM
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Had problems with the tank breathing before - something to do with andy putting the wrong pipes on the wrong holes in the tank... no hissing like that.


Don't know the answer about the plugs tho...
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Old 16-01-2008, 10:24 AM
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You had the fuel pipes off then? Jester had a similar thing with a Triumph - turned out the vacuum pipe to the carbs wasnt on right. Did a similar thing - would stall at junctions, sometimes even cut out when running.

Has it ever run right since the pipes were replaced?
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Old 16-01-2008, 10:34 AM
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Quote:
Originally Posted by minxy
You had the fuel pipes off then? Jester had a similar thing with a Triumph - turned out the vacuum pipe to the carbs wasnt on right. Did a similar thing - would stall at junctions, sometimes even cut out when running.

Has it ever run right since the pipes were replaced?
Yeah thats the wierd thing - i use her every day, so she's run perfectly since end of September (once Andy corrected his little mistake with the pipes). I'm not on her today cos i'm going boozing after work, so I won't know til tomorrow if it was literally just a blip or whether its a continuing problem.

She does like to rattle bits off though, so its possible that something has come loose/off just from general vibration/potholes etc.
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Old 16-01-2008, 11:24 AM
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Quote:
Originally Posted by Kylie
Plugs were new in September - Andy changed them when he serviced it.
Still got the old ones?

The most likely time for a vehicle to develop a problem is immediately after it's been serviced. Just because stuff is new and in a box, doesn't mean it's any good!

I bought a Ducati once, rode it home and it died as I got on the drive.

No spark.

Did loads of stuff to it, couldn't get a spark, but had to leave it due to being in the Air Force.

Some months later, not being in the Air Force any more, I set about it again.

I'd left the plug as it was a spanking new one and sparked merrily on other things.

In desperation, fitted a new plug.

Fired up straight away.

At least to the end of the road where it died again.

Light dawns. Rang guy I bought the bike from, turns out the new plug he fitted came from the same place as the one I fitted.

Box of duff plugs.

Stuiffed grotty used plug in there. No more problem.

Well, not with the plug anyway........
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Old 16-01-2008, 11:26 AM
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No, Andy didn't give me any of the old parts, and we kind of don't see each other any more!

It still seems odd that the plugs would go duff after more than 3 months rather than just after they were changed...
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Old 16-01-2008, 11:34 AM
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Quote:
Originally Posted by Blackjack
Still got the old ones?

The most likely time for a vehicle to develop a problem is immediately after it's been serviced. Just because stuff is new and in a box, doesn't mean it's any good!

I bought a Ducati once, rode it home and it died as I got on the drive.

No spark.

Did loads of stuff to it, couldn't get a spark, but had to leave it due to being in the Air Force.

Some months later, not being in the Air Force any more, I set about it again.

I'd left the plug as it was a spanking new one and sparked merrily on other things.

In desperation, fitted a new plug.

Fired up straight away.

At least to the end of the road where it died again.

Light dawns. Rang guy I bought the bike from, turns out the new plug he fitted came from the same place as the one I fitted.

Box of duff plugs.

Stuiffed grotty used plug in there. No more problem.

Well, not with the plug anyway........
It's the Resistor type that can be iffy. I get it all the time with them. I try to fit non resistor ones when i service stuff as it is less likely to give me grief
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Old 16-01-2008, 11:35 AM
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So how does one find out if they are the resistor type?
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Old 16-01-2008, 11:37 AM
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They'll have an R in the plug number
http://www.britchopper.co.uk/forum/viewtopic.php?t=7704
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Old 16-01-2008, 11:44 AM
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Hmm if i mandp search for my bikes spark plugs it comes up with these

DR8ES NGK Spark Plug

So looking possible....

arse!
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Old 16-01-2008, 05:55 PM
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I'm probably going to upset a lot of people on here..but if you have K&N filters they have been known to cause problems in wet weather...If you have had it standing outside or have pressure washed it you may have water in the carb/s flushing the tank without emptying the float bowl/s can be a waste of time..Just a thought...someone with more knowledge than me might like to comment...John
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Old 16-01-2008, 07:12 PM
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Quote:
Originally Posted by John Hopkins
I'm probably going to upset a lot of people on here..but if you have K&N filters they have been known to cause problems in wet weather...If you have had it standing outside or have pressure washed it you may have water in the carb/s flushing the tank without emptying the float bowl/s can be a waste of time..Just a thought...someone with more knowledge than me might like to comment...John

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Old 16-01-2008, 08:20 PM
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As I've stated elsewhere I've got S&B filters on the 550 and I've had very few problems with them in the wet.......
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Old 16-01-2008, 09:39 PM
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Kylies bike has the standard airbox.
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Old 16-01-2008, 09:51 PM
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I have a standard box
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Old 17-01-2008, 09:33 PM
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Kylie has a standard box? Kylie smells burning rubber? what the f***....?


Kylie just change the damn plugs and all will be fine, first clue, its done it before, second clue, you have not ridden it for a month, third clue, you is a girl!

Trust me, cos you ride in town a lot change the plugs (NOT 'R' ones unless you redline all the time) every 1500 miles, its worth it.

When I had a bike shop....(yeah yeah..) I found around 1 plug in 10 failed rather quickly, you have 4 plugs.... odds are one at least is duff now.
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Old 17-01-2008, 10:02 PM
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She's running fine now.... except for the idle speed isn't constant, it keeps dropping below 1000 revs.

And I don't think I've done more than about 1000 miles on her since the service.

See what she does over the next few days, if it doesnt improve i may have to change the plugs. Did wonder about twiddling the idle speed knob but didnt know if the fact its changed was indicative of something else that i should worry about
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Old 17-01-2008, 10:05 PM
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*cccccccccc* (noise of air being sucked through teeth)

That sounds expensive luv!!!




















Probably sucking air somewhere to affect idle speed
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Old 18-01-2008, 07:16 AM
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Quote:
Originally Posted by Kylie
She's running fine now.... except for the idle speed isn't constant, it keeps dropping below 1000 revs.

And I don't think I've done more than about 1000 miles on her since the service.

See what she does over the next few days, if it doesnt improve i may have to change the plugs. Did wonder about twiddling the idle speed knob but didnt know if the fact its changed was indicative of something else that i should worry about
check the vacuum takeoff hose hasnt gone soft, they can go soft which causes them to collapse and restrict the fuel flow, easy to check, squeeze the tube lightly and rev the engine, it should stay solid, if it feels soft then change it.
But I still bet its the plugs.
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