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Post by huggyg71 on Sept 3, 2010 22:42:51 GMT
Hi there, I have been having an ongoing annoying problem with my restricted 600n. I have had this problem from I got the bike in May of this year but seems like its been getting steadly worse and I need to fix it asap as I think its actually quite dangerous.
The bike is used every day and has started up every single morning without fail so far with either the first or second press of the button with no choke required so far and it generally runs nice and revs to 8k + if needed easily but when stopped at traffic lights for a few mins though when im commuting, the bike will sometimes choke and splutter when trying to pull away and cuts out on me if im not quick enough to pull the clutch and blip the throttle a bit. It decided to do this to me tonight when I was turning right from a busy main road into a side road just at the point where I started to lean over :-)
I changed the spark plugs with iridium ones and a new air filter just a week or so after I got the bike along with an oil change and then I left it into the local dealers a few days later and got the valve clearances checked with no adjustment needed I was told and the carbs balanced, which I was told just needed a wee tweak and the problem unfortunatly has remained and over this past 1800 ish miles it seems to have got steadily worse.
After reading up a bit it seems it could be water or dirt in the tank or maybe something else but was thinking of trying to drain the tank first as a place to start anyway.
What would be the best way to drain the tank and also get rid of any water or dirt in it?
The haynes manual says if I remove the tap assembly I will need to buy a new o ring which means ordering one up and waiting ages. Would a garden hose as a syphon work instead do you think?
Its my only means of transport and I do not have the time or skill for stripping carbs and so on myself so if it comes down to that ill have to leave it in. Any help would be great thanks.
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Post by Boots O'Lead on Sept 3, 2010 23:45:48 GMT
Hi there,
If you're concerned about water in the fuel system the first thing I would do is check the carbs (drain screw at bottom of float chamber lid - see haynes manual) then to check the fuel tank disconnect fuel pipe (if you can be bothered faffing about disconnect from the filter inlet so you can use that bit of pipe to avoid spillage) and use the Prime setting on the fuel tap to drain some fuel into a jar. A couple of inches depth should do the job, then allow it to settle for a few minutes and any water/dirt present should show at the bottom of the jar. If all is OK then reconnect pipes (and if fuel is clean and water free then throw it back into the tank)
If that doesn't show up any problems have a check for air leaks between carbs and engine (too much air will give an over lean mixture which could cause idling/throttle pick up problems especially when warm)
hope this helps
Jules
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Post by bobh on Sept 4, 2010 21:54:58 GMT
Both my 600's have shown a tendency to stall when trying to pull away after idling for more than 10-15 seconds, particularly after a spell at speed (e.g. coming off a dual carriageway and having to wait at a roundabout). I put it down to spark plug fouling, and got into the habit of blipping the throttle every so often to clear it, which seemed to work.
The fact that your bike starts from cold without using the choke implies that it may be running a bit too rich on idle, which wouldn't help plug fouling.
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Post by pilgrim on Sept 4, 2010 22:23:56 GMT
I'd go for strictly fuel problem. I recently filled up at a supermarket and found the engine mis-fired at around 4-4.5k. I told my wife that I thought the bike budget might have to include new spark plugs but since another tank of fuel was purchased I've not had the problem again.........  Water in the petrol tank or inlet rubbers, I think.  Maybe......... |
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Post by huggyg71 on Sept 6, 2010 19:52:47 GMT
Thanks for the help folks.
I have let the tank run almost to reserve and taken a sample of petrol from the filter inlet hose and from the very bottom of the tank using a length of hose pipe and both samples are squeaky clean with no water or gunk.
bobh what you described sounds exactly like my problem. I will try a few blips while im sat at lights to see if it helps, no doubt get a few peeps thinking im after a race lol.
It has actually needed the choke this past few mornings for 20 secs or so to keep it idling as its been colder and then putting the choke on when warmed will make it conk out so I think thats as it should be.
I will hopefully get a chance to pull out the plugs out and also check the carb rubbers condition on Wednesday if the weathers anyway decent.
Thanks again.
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Post by huggyg71 on Sept 7, 2010 20:43:34 GMT
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Post by huggyg71 on Sept 24, 2010 18:28:34 GMT
Just thought I would post an update. I removed the plugs and they all looked pretty much ok to me although maybe a wee bit dark. here is a picture of two of them, the other two look pretty much the same.   I knew the air filter was fine as it was only changed a few months back but I checked it again just in case and I also removed the air box from the carbs and reseated it all just to see if that would help but unfortunately it didn't. The inlet rubbers were out of stock for a few days and when they arrived its been raining every day I have had off work so I only got a chance to do them today, not being a great mechanic I wasn't looking forward to it but I got stuck in to it anyway. I got the carbs off and the rubbers were not cracked all the way through but they didn't look like it would be long before they were. The holes in the restricting washers in the rubbers looked a bit strange though and after reading up a bit before I tackled this job, seem to remember a few people mention that the position of the holes in the washers might be important so I put them into the new rubbers with the holes at 12 o clock. Here is a pic of how they were.  It took a while getting everything seated again but wasn't the nightmare I was thinking it was going to be and start to finish with a few coffee breaks took me just over two and a half hours. Took it out and did almost 20 miles of stop start traffic to test it and so far there no hint of choking or spluttering. Hopefully thats it fixed, thanks again. |
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Post by teejayexc on Sept 24, 2010 20:52:27 GMT
Well done Huggy, always nice when work you do yourself bears fruition. Ps, don't think the positioning of the restriction holes would make any difference, but eh if it feels right do it  |
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Post by neilmud Lord Protector on Sept 24, 2010 22:59:48 GMT
BTW thats a good picture for all the people who come on here asking about restricting their 600 maybe a mod could make it fixed/sticky post for others reference.
Neil
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Post by huggyg71 on Oct 22, 2010 23:05:11 GMT
Guess I shouldnt have been so quick to post that I had fixed it lol. All was fine for a few days, almost a week and then pulling away from traffic lights it started again.
I can pretty much make this happen now to order. Travel 2+ milles at either 30 mph in 3rd or around the same at 40 in 4th and then sit for 20 secs at a traffic light and then when pulling away it will pretty much do it every time once the engine is warm.
Ive tried blipping a bit while sat at the lights as suggested but didnt work sorry. I can pull away ever so gently and its ok but if i give it 2000k or more it will bog down then after a few blips its ok again.
This is only a pain when commuting and it runs great otherwise but its annoying me now. I thinks its the restriction somehow causing it as its almost as if it cant breath for a few seconds,
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