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+--- Thread: Restricted??? (/showthread.php?tid=71639)
Re: Restricted??? - Silverlegacy - 24-02-15
(24-02-15, 10:27 AM)Fazerider link Wrote:Is it running on all 4 cylinders?
If not, that might account for the vibration and lack of power.
Try changing the spark plugs... the condition of the old ones should tell you if the problem lies with one particular cylinder.
Yeah it seems to run fine, I did a carb sync last week and running ok and even, the pipes all get nice and warm from start.
I havent tried the spark plugs yet though.
I read somewhere saying that theres an easy way to get to the carb inlet rubbers to check for restrictor washers? is it worth checking? or too much hassle for someone with limited mechanical know how.
Although I was going to check the air filter at lunch so is this something i could do while ive got a few bits off the bike
Re: Restricted??? - Punkstig - 24-02-15
For someone with little knowledge I'd advise setting aside a whole day to look at it, not just an hour or so!
As for the air filter, take it out and run the bike without it if there's no change then it's not the air filter!
When it's running out of steam have you got the throttle fully open? Or are you opening it more and nothings happening?
How far round does it twist - imagining released its at 12 o'clock - does it twist back to 9? 8?
Re: Restricted??? - Silverlegacy - 24-02-15
I live about 8 miles from where i work, so if i removed the air filter and rode home to test it out would this work?
The bike itself seems to get up around 5-6kRPM and then just seems to struggle, but feels the same in pretty much every gear, once you get up to around 8-9kRPM it feels like its running out of power and youve reached your limit for that gear and then have to change up, I remember on my last fazer i could push it beyond that, very much doubt i would even attempt to redline it as it feels stressed at around 8-9K.
The throttle seems to to be fine and twists freely and is about the same as other bikes i have rode.
Re: Restricted??? - noggythenog - 24-02-15
Has it had an oil change recently ie with car oil?......just curious if it could be the clutch slipping at higher revs if it has the wrong oil in..........or was it running well before & then started doing it without any changes ie services?
Re: Restricted??? - Punkstig - 24-02-15
(24-02-15, 12:36 PM)Silverlegacy link Wrote:I live about 8 miles from where i work, so if i removed the air filter and rode home to test it out would this work?Well you'll know if it runs differently over that distance, and won't hurt anything- point is its a 'free' way of checking if the filter has anything to do with your problem before you go buying a k&n!
It's starting to point more in the direction of a restriction kit fitted though!
Re: Restricted??? - Silverlegacy - 24-02-15
(24-02-15, 12:40 PM)noggythenog link Wrote:Has it had an oil change recently ie with car oil?......just curious if it could be the clutch slipping at higher revs if it has the wrong oil in..........or was it running well before & then started doing it without any changes ie services?
Its had an oil and oil filter change about 5 months ago at a motorcycle dealer.
Its been running like it pretty much since ive owned it, I left it at the garage and the mechanic took it out and said its fine and nothing wrong with it mechanically? so would like to think that hes given me the right advice, rather than making up a list of things that could be wrong just to make money off me.
I will give the air filter thing a try, i did check it the other day and seemed clean enough, but my clean and other peoples clean might be two different things.
Dont have any other biker friends local who could at least take it out and give me there opinion and trying to find a big enough section of road to at least try and push bike a little
Re: Restricted??? - Ruby Racing - 24-02-15
Just a thought. There might be crap in the fuel tank blocking the fuel tap slightly so the bike isn't getting enough fuel to the carbs. It would be OK at low rpm as there would be enough fuel, but at higher rpm's it would struggle. Not had experience of this self, just read about it. So I may be wide of the mark.
Re: Restricted??? - noggythenog - 24-02-15
(24-02-15, 01:08 PM)Ruby Racing link Wrote:Just a thought. There might be crap in the fuel tank blocking the fuel tap slightly so the bike isn't getting enough fuel to the carbs. It would be OK at low rpm as there would be enough fuel, but at higher rpm's it would struggle. Not had experience of this self, just read about it. So I may be wide of the mark.
Good call
Also the fuel pipe that goes from the underneath of the tank could be kinked etc but if youve been doing carb balance etc then youve had the tank up and down so not likely.
Re: Restricted??? - Silverlegacy - 24-02-15
(24-02-15, 01:08 PM)Ruby Racing link Wrote:Just a thought. There might be crap in the fuel tank blocking the fuel tap slightly so the bike isn't getting enough fuel to the carbs. It would be OK at low rpm as there would be enough fuel, but at higher rpm's it would struggle. Not had experience of this self, just read about it. So I may be wide of the mark.
I will have a look into this also, typical that i filled up the other day so still loads if fuel in there, once i have ran it down a bit i will try and drain the fuel tank and give it a good clean out.
Re: Restricted??? - Silverlegacy - 24-02-15
Air filter looks ok to me? What you think??
Re: Restricted??? - darrsi - 24-02-15
Fuel filter could also be blocked, only a few quid to replace.
I could be off the mark here, but writing on parts indicates second hand to me?
Re: Restricted??? - Silverlegacy - 24-02-15
I took the fuel filter out and gave it a good blow through, so hopefully dislodged any junk in there, although looks in reasonable condition.
hard to tell what the numbers are on the air box, but like you say it might very well be a second hand one, although not sure how big the second hand market is on used generic air filters??
Running out of things to try that are with in my technical limits, i think checking carb rubbers for washers is beyond me looking at how they are attached and how to get to them.
Might be another trip to my local mechanic
Re: Restricted??? - Paulfzs - 24-02-15
what air filter is that?
mine looks nothing like it.
Re: Restricted??? - noggythenog - 24-02-15
If you wanna lose 15 minutes of your life then heres a vid i did on my 600 when i got a new camera.....ok the video is crap and the camera wrong way round but anyway it does illustrate the rev needle climbing way beyond 5k, shame you cant see 5 k on the vid but i reckon i was probably cruising around there as i like to hold gears a bit.
My engine needed a carb balance but was still powerful way beyond 5k
http://youtu.be/iAab4UxISiU
Re: Restricted??? - bigbluebear - 24-02-15
Why don't you get it Dyno'd, that will tell you plenty with what's maybe wrong with it.....will cost you £30-£40 and stop you second guessing and fannying around.
Re: Restricted??? - Jules-C - 24-02-15
It sounds to me like it is restricted either in intake or exhaust. Since either severely restricts the airflow it stops it revving out even in low gears. Only way to tell would be removing carbs and exhaust to check
Re: Restricted??? - Silverlegacy - 24-02-15
No idea what air filter it would is, whether it's a standard on or cheap replacement?
Might look into dyno if I can find somewhere local.
Hard to know much more about the bike as bought it as a part ex from a dealer so didn't speak to original owner and dealer knows very little about the bike.
Re: Restricted??? - Punkstig - 24-02-15
Good call with checking fuel lines, don't forget the fuel tap under the tank too- is that properly open?
Seems strange that a mech took it out and said it was fine, pop to another bike shop for a second opinion, just ask someone to take it for a quick ride!
Re: Restricted??? - Silverlegacy - 24-02-15
Cheers for all the help and info guys.
Bearing in mind i have been riding on and off for nearly 15 years i still dont know much mechanically about bikes.
Will try and take it to another bike mechanic and see what they have to say, it just doesnt feel right and its niggling at me as i really like the bike and its ok at the lower end, i just want to open it up sometimes.
Re: Restricted??? - darrsi - 24-02-15
(24-02-15, 03:50 PM)bigbluebear link Wrote:Why don't you get it Dyno'd, that will tell you plenty with what's maybe wrong with it.....will cost you £30-£40 and stop you second guessing and fannying around.
Make that £50 or £60 in London.