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Post by trumpetdude on Apr 10, 2014 18:12:53 GMT
So, not quite looking for answers yet but wanting to ask if I might be missing something off my list. Just heading out today and the bike began stuttering, (I did hear a tick tick tick sound just as I was moving off, though it may been a stone stuck in the wheel.) About 500 yards down the road the divvy stutters as though short on fuel, switched to reserve and it felt as though it was taking ages to come through. Long story short it eventually cut out. Checked the tank and there was fuel in it. Started after a couple of attempts, (actually put it back to main tank just incase  ), and headed home. Within about 200yards from the driveway it died, tried on reserve (whislt coasting bump and on the starter) and nothing. Thankfully I live down hill from that junction  I've looked in the tank proper this time and there's definitely fuel in there, at least 2 liters, more than enough. Here what I'm thinking. Blocked vacuum / breather (The bike ran and revved freely on the stand when I got it home, albeit after opening the fuel tank). Blocked fuel filter / fuel line (Fuel filter was changed less than 1000 miles ago) Badly adjusted carbs (had a beautiful 60 mile ride at sun down last night, all through the power band with no problems) Carb diaphragm / vacuum - Hmm Air filter (Unless I'd hoovered up four leaves I doubt I'd have a total failure). Spark - Plugs, plug cables, CDI... (why would it fire fine at home - rev to 9k quite happily?) Anyone got anything else I could be missing? I'm really short on time for the rest of the day, and tomorrow, so I'll do a pokey visual check first. Cheers folks. |
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Post by trumpetdude on Apr 10, 2014 18:55:37 GMT
So, fuel in the air filter. I know it's fuel as I've just popped a bit of red ex in. I know it's not Mr Muscle but it can help. What is it that causes this problem again?
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Post by m40man on Apr 10, 2014 18:59:49 GMT
Anyone got anything else I could be missing? From the symptoms & your comment it runs fine after opening the cap, I'd go with a blocked vent in your fuel cap as a 1st check. Tested by riding off until it stutters again, maybe completely cuts out, then quickly stopping & opening the fuel cap. If you hear a 'whoosh' as a vacuum in the tank is replenished with air - it's the fuel cap vent being blocked. If not, it's summat else. |
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Post by trumpetdude on Apr 10, 2014 19:07:16 GMT
Cheers Groovy, not entirely sure that the breather is in the cap (no hole, pipe etc) but there must be one somewhere. Afraid it'll be a few days now before I can examine.
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Post by pilgrim on Apr 10, 2014 20:29:55 GMT
Hi, If the problem is sporadic or random it could be an air vent problem at the tank but it's difficult to imagine the petrol flow being severely disrupted if pumped. Try m40mans test for sure though, there is a vent in the cap. Have a good look at the carb inlet rubbers. My 'N' played up and there was no logic at the time other than it just got worse. If nought else you can eliminate it as the cause. |
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Post by CD on Apr 10, 2014 21:06:26 GMT
A weak battery can do strange things because it affects the spark igniter box.
Also check the TPS as that affects the spark advance.
A volt meter on the dash is always worth having. The LED type cost only a few £s and easy to fit. Get one with a decent scale - red amber green is more of a farkle than a useful gauge.
Fuel pump can give trouble especially the vacuum driven type. It's easy enough to fit a D900 electric pump.
Sent from my phone with mangled spelling
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Post by trumpetdude on Apr 10, 2014 23:48:59 GMT
Cheers Chaps. Dunno where that breather is but I'll check it out. Hopefully that'll be it as I'll be lucky to get right into the carbs this weekend.
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Post by neilmud Lord Protector on Apr 10, 2014 23:57:26 GMT
Check out fuel lines (filter & pump), tank breather, drain carbs (maybe drain tank if you run low maybe full of water),unlikely carbs will go out of adjustment suddenly, check for gunge in airfilter And if you have had tank off check for trapped/kinked breather/fuel pipes. Also one of my favourites cracked/split carb rubbers  Neil Sent from my PC using one finger |
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Post by trumpetdude on Apr 11, 2014 8:40:03 GMT
Cheers Neil, gutted I can't get into it today. It's Sunny. In Scotland! The main concern about the carbs is the fuel on top of the air filter. I think this only just happened when I was heading out as there was no residue in the bottom of the filter box.
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Post by Doom on Apr 12, 2014 7:33:37 GMT
Cheers Chaps. Dunno where that breather is but I'll check it out. Hopefully that'll be it as I'll be lucky to get right into the carbs this weekend. Sent from my GT-I9505 using Tapatalk Some people who were with me on a Worcestershire-ish sort of run a few years ago (paricularly Mac who was back-marking) will remember me having trouble with a kinked breather pipe on the Mighty XJR. I would have thought it would run a bit further than a few hundred yards with only a couple of litres in the tank. However it sounds like a reasonable bet though it doesn't account for fuel in the filter. Martin's trick should be an indicator. FWIW (and the point of my post) the breathers on the Mighty XJR are two long rubber pipes that exit the bottom of the tank (and get caught on a cross member (presumably Aardy ) if the tank is removed and re-fitted incorrectly). One is attached to a vent in the fuel cap assembly. Yours might be similar. |
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Post by trumpetdude on Apr 12, 2014 8:50:25 GMT
Aye, I think you're right, I do remember that running that pipe, can't think how it would have got kinked but definitely on the check list. Got time to get into today so hopefully I'll get back with a few more posts.
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Post by CD on Apr 12, 2014 10:34:33 GMT
It might be the fuel tap is clogged with crud. It could then fill the carbs slowly so it runs after a delay but won't feed fast enough to run properly. You can buy new seal kits
Sent from my phone with mangled spelling
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Post by trumpetdude on Apr 12, 2014 12:52:01 GMT
Fuel breather is fine, blew from the mucky end into the tank and it's pretty free blowing. Whilst moving the tank about I noticed something rattling inside the tank so it's getting drained after lunch to see if I can get the best of crap out. That could have been it. Carb rubbers (upper) appear to be fine I'll check the lowers when it running later in the dark with a torch. There a wee bit of white gunk at the join of the crank breather to airbox but as it was a very short run on Thursday and a bit of tick over on Friday it might just be a bit of condensation. Sprayed some Carb cleaner in with it of and will do again with it running. Don't have the time this weekend for a full strip, (or anytime just now!). It may have to be a garage job. With fuel tap in reserve or full position fuel is held in the tank and runs freely on prime so all seems fine there. Also check the fuel flow once the wife gets up. Quiet mornings when there's a nice get shift in the house. Any further ideas greatly appreciated! Sent from my GT-I9505 using Tapatalk Attachments:
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Post by teejayexc on Apr 12, 2014 13:51:39 GMT
The loose thing rattling about is probably the gauze strainer that fits over the tap outlet in the tank, common occurence for those to work loose. Could have let a bigger piece of crap into your fuel line if it was absent, hopefully you've blown it clear now.
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Post by trumpetdude on Apr 12, 2014 15:00:58 GMT
So, weird wee disc black thing came out of the tank after much shaking and dancing in the back garden with an upside down tank. There was something else in there but it either came out without me knowing or got stuck else where. I put about 2 1/2 liters of fuel in and ran it, seemed fine until it cut out again. This was on main at the fuel tap. Switched to reserve and it ran fan. Fuel gently pulsing through the filter. I put about another 3 liters in ans switched to main. Started fine, ticked over and revved fine. Fuel going through the filter as it should. I took it out for a very short spin and no problems. Left it ticking over for a few more minutes and decided it would probably do that all day if I let it. I've also changed my mind about the air box, I think it was a bit of oil, or at least hot oil gas residue from the crank breather mixing with the my air filter oil which is a K&N, hence the slight red texture to the oil. Not redex in petrol which would have totally evaporated. After all this I think it may have been a random bit of fuel starvation so as I'm away loads this year I might just put it into Eclipse in Tranent for a carb service. I'm not going to be around so it won't be missed. I'll maybe get out for a more adventurous run tomorrow, up hill Cheers folks. |
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Post by watcher1 on Apr 12, 2014 17:06:43 GMT
So, weird wee disc black thing came out of the tank after much shaking and dancing in the back garden with an upside down tank. There was something else in there but it either came out without me knowing or got stuck else where. I put about 2 1/2 liters of fuel in and ran it, seemed fine until it cut out again. This was on main at the fuel tap. Switched to reserve and it ran fan. Fuel gently pulsing through the filter. I put about another 3 liters in ans switched to main. Started fine, ticked over and revved fine. Fuel going through the filter as it should. I took it out for a very short spin and no problems. Left it ticking over for a few more minutes and decided it would probably do that all day if I let it. I've also changed my mind about the air box, I think it was a bit of oil, or at least hot oil gas residue from the crank breather mixing with the my air filter oil which is a K&N, hence the slight red texture to the oil. Not redex in petrol which would have totally evaporated. After all this I think it may have been a random bit of fuel starvation so as I'm away loads this year I might just put it into Eclipse in Tranent for a carb service. I'm not going to be around so it won't be missed. I'll maybe get out for a more adventurous run tomorrow, up hill Cheers folks. Well thats another tracker down the pan. Watcher |
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Post by CD on Apr 12, 2014 22:41:21 GMT
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Post by trumpetdude on Apr 12, 2014 23:13:58 GMT
A 98, looked into that and it's actually on the to do list. I'll await the verdict from Eclipse.
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Post by trumpetdude on Apr 12, 2014 23:14:24 GMT
Watcher.. Enemy of the state.. Under the radar now...
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Post by trumpetdude on Apr 13, 2014 9:14:24 GMT
RFID for datatag allegedly!
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), and headed home. Within about 200yards from the driveway it died, tried on reserve (whislt coasting bump and on the starter) and nothing. Thankfully I live down hill from that junction 
