stevie16v Posted April 2, 2014 Posted April 2, 2014 Looking for some help here, I've posted a thread on the deauville forum too but was hoping you guys could chip in.Long story short the bike in neutral will rev through the range, in 1st it will go up a fair bit (I haven't red lined it) In second the power dies off at 5-6k revs. In 3rd and above she just struggles to get over 5k revs. She doesn't misfire when she runs out of puff.Also when idling, every now and then she misses a beat and there's a click from the carb areaHere's a video"> So far I've done the followingStripped and cleaned carbs - No tears in rubber bits etcClean fuelRan without the fuel pump, and fuel filter to narrow it down.Checked to ensure no kinks in fuel pipes etcEnsured all carb rubbers are seated correctlyChecked throttle sliders are moving freely and also the butterflies open fullybalanced carbs and ensured fuel mix is close to factory setting.I'm at an end as to where to go other than possibly spark plugs, but I'm reluctant to throw money at her.Can anyone offer any suggestions? Quote
ApolloMozart Posted April 3, 2014 Posted April 3, 2014 Long time ago I remember having a similar issue with my car carburettor - I think I ended up cleaning some very narrow fuel channels in it - deposits blocked them and under load the fuel was not enough to rev the engine. was spinning ok under no load. Quote
V1P3R Posted April 3, 2014 Posted April 3, 2014 Don't know if it would help but what do the spark plugs look like? Are they giving a good spark? Just wondered if something other than carbs restricting engine as it sounds like you've done a good carb check. Quote
ApolloMozart Posted April 3, 2014 Posted April 3, 2014 I was just about to say the same! The mixture in cylinders is different when running with no load and under load, worn spark plugs may struggle "sparking" under load. Quote
stevie16v Posted April 3, 2014 Author Posted April 3, 2014 I've only been able to check one spark plug, the front one is a nightmare to get out without the correct tool. Which I'm currently waiting on. It seemed ok, no strange deposits etc.I'm at the point where I might strip the carbs back down AGAIN! and give it another cleaner through because it's really winding me up Quote
DreamytimeEscorts Posted April 3, 2014 Posted April 3, 2014 Is the mixture OK? Mine coughs a bit when the engine's cold and I take the choke off too soon. Quote
stevie16v Posted April 3, 2014 Author Posted April 3, 2014 I've set it to the factory (2 turns out) and at idle it runs fine apart from that occasional drop in the revs with the pop.It's strange, only way I can describe it is if you think about driving a car, if you've ever hit the rev limiter on it the power tails off as you reach it then it just sits at a set amount of revs. That's the closest I can think of Quote
V1P3R Posted April 3, 2014 Posted April 3, 2014 Ht leads ok? Battery fully charged? Air filter clear?On a car I would say air leak somewhere maybe. Quote
stevie16v Posted April 3, 2014 Author Posted April 3, 2014 HT Leads look ok but I haven't tested their resistance yet.Battery is good and fully charged.Air filter is pretty clean, certainly not dirty enough to cause problems from my experience.I've got to work today so it'll take a back seat until tomorrow and I'll go out and check again for air leaks, but I'm pretty sure it's all tight Quote
V1P3R Posted April 3, 2014 Posted April 3, 2014 I'm out of ideas now then! All the best with ffinding a solution. Hope it's not something like a limiter lol! Quote
Mr Fro Posted April 3, 2014 Posted April 3, 2014 Have you tried spraying some carb cleaner round the inlet rubbers while it's running?It does sound like something carby is blocked.fuel starvation or the timing is a bit iffy. Quote
stevie16v Posted April 3, 2014 Author Posted April 3, 2014 I'm going to try that tomorrow but I'm fairly certain everything is snug. Got new plugs on order too. Quote
Fozzie Posted April 4, 2014 Posted April 4, 2014 Main jet kicks in around those revs. Sounds blocked! Quote
stevie16v Posted April 4, 2014 Author Posted April 4, 2014 Main jet kicks in around those revs. Sounds blocked! It was spotless when I took it apart, but I think it might be an idea to do it again and clean them. For all the time it takes once the carbs are off the bike anyway Quote
Chrissb6 Posted April 4, 2014 Posted April 4, 2014 Hi is the motor revving clean in neutral or spluttering? is this fault immediate as soon as you go through the gears, or do's it come after a while of riding? Question question l know!It could it be that the fuel tank breather is blocked, fuel flow issues, maybe the air filter or even the exhaust might be choking the engine. Just a process of ticking them all off one by one.Hope you soon sorted. Quote
stevie16v Posted April 4, 2014 Author Posted April 4, 2014 I might be on to something...I don't think this is how it should look when you open the float bowl!!!http://i436.photobucket.com/albums/qq88/stevie16v/IMG_20151.jpgI'm hoping this is what the issue has been. Wish I'd opened up the carbs the last 3 times they were off!Fitted new plugs aswell. Unfortunately when I was cranking the bike the battery Ko'd. SO got it on charge just now but won't get a chance to take it out because I need to leave for work at 3. Fingers crossed! Quote
eastanglianbiker Posted April 4, 2014 Posted April 4, 2014 is that a brass carb jet under the float at the top of the pic and if so i would say its meant to be in the big hole and that will be the cause of it not revving as it will be just flooding Quote
stevie16v Posted April 4, 2014 Author Posted April 4, 2014 It certainly is, I must not have tightened it up properly. Silly person....... Quote
stevie16v Posted April 7, 2014 Author Posted April 7, 2014 Took it out today, pulls through the revs in every gear now. Sorted Quote
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