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Engine power issue


Glorian
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Ok i've had this happen before. Long story short, Riding down A12 this morning at about 60 cause traffic sucks. Decided to overtake, opened throttle to move out and got nothing from the engine, pulled back in dropped a gear and revved, nothing but a few splurty revs. So thankfully near a slip road i pulled into the marks tey petrol station. Got off, filled up (£5 not even 1/3 a tank) started up shook the bike a little and set off. Bike was absolutely fine.


Now when this happened last time it was my coil, guy who checked for me (came out from local garage) touched the down pipes to see if they were hot, 2 of them were not. So i decided to try this today and they were all hot.. Now the only other thing i can think it might be is a slight fuel blockage? That cleared once i added more fuel and shook the bike around. In which case will i need to empty the tank and clean it?


Any suggestions appreciated =)

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Is it cold?


It will be carb icing


It will clear when you stop and the heat melts the ice on the jets in the carbs


You can get some profst additive to stop it

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I had let the engine warm up for about 5-10 minutes and had been riding for 10 minutes when it happened, It wasn't overly cold around my area this morning could it still be a cause?


http://www.amazon.co.uk/SILKOLENE-SYSTE ... B006MVFV46


This the stuff? is it worth using anyway to help the bike?

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Sounds similar to what happened to my bike when I had water in the fuel, it would start and idle fine and would even ride until I opened the throttle more then it would splutter and not much would happen. Turned out to be a blocked fuel cap drain so water was collecting around the cap and then when I opened it the water dribbled in.


Might not be the problem but once the water passes through the engine the bike will be fine afterwards.

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If it cleared afterwards, a dodgy coil won't be found using the downpipe trick...


I think at this stage lets see if the problem worsens.


I wondered about carb icing as cold air and the way carbs function mean they can ice up. Unless your bike is modern enough to have carb heating.


Right now it sounds fuel related, or coil. If it keeps on doing it let us know!

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Well i have to ride to my mates tonight and then home from his, so will have plenty of time to tell. Only just had a replacement coil stupid question as tbh before it broke i never knew about coils :D So is there just the 1 or 2? if so it could be the other needs changing to.

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For 4 cylinder engines they either have coil packs attaching directly to the spark plugs, so there will be 4. Or there will be 2 coils, each controlling 2 cylinders, usually one for the inner cylinders, and one for the outer.


If one goes, it is reasonable to assume the other could fail soon being a identical part with the same weaknesses.

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Think there is 2. as last time when it went the outer 2 cylinders stopped. I will see how it warms up later and check the coil. If it plays up again i'll order a new one. Is a coil tricky to replace? Dont mind taking fuel tank off as i need to put heated grips on and that will make doing that easier :)

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It makes no odds how long you warm the bike up


Carb icing happens due to the cold air and it gets colder in the carbs this with moisture in the air forms ice


It usually happens when you roll off the throttle and fuel flow decreases it allows the ice to form

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Could be carb icing but it's a little bit warm for that isn't it? Plus I would have though your bike would have carb warmers unless it's >20 years old!


I'm leaning towards a vent blockage in the tank - pressure released when you filled up. If it happens again, try popping the tank cap and see what happens.

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Could be carb icing but it's a little bit warm for that isn't it? Plus I would have though your bike would have carb warmers unless it's >20 years old!


I'm leaning towards a vent blockage in the tank - pressure released when you filled up. If it happens again, try popping the tank cap and see what happens.

 

Will try that. and post results.

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Its not too warm for carb icing a lot of it depends on the moisture in the air


The intake temp is rather cold at speed

It's quite a lot warmer down here in the south. :-)

 


have a read of this :thumb:


dont forget to scroll down and read the part that says car icing can happen at 38°c :wink:



everyday is a school day :)

carburettor_icing_chart.pdf

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Blimey, never knew it would cause issues at that sort of temperature :o


I'll order some of that stuff i linked earlier tonight i think. glug a blob into my engine and it might just help in general.

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it is apparently really good stuff although very hard to get local places will not stock it


its a preventative measure for winter riding as you never know when it will happen


the carb heaters on the bandit are shit in fact all suzuki carb heaters are shit!!


my gsxr600 had carb heaters and it was wrapped in fairing so more protected and suffered really badly from carb icing!


as I say though its not how warm the bike is its how cold the air is inside the carbs


think of wind chill :)

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personally


I wouldn't bother!!


I have done a few winters on bikes and for the amount of times carb icing actually happens it wont hurt to sit and wait for them carbs to warm up


although its a nice added safety feature as you dont want it stopping in the middle of no where in pitch black! or mid corner!


its your choice :thumb:

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Hi, have you check that all the hoses are ok and not gone soft? In particular the vacuum hose to the automatic fuel cock if this has gone soft when you twist the throttle you will create a higher vacuum than normal in this pipe, the pipe if soft might be sucked flat causing the fuel valve to close just a thought. I doubt very much your problem is due to carb icing.

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