Jittery at low revs

[bikerboys]

have you draned the carbs worth a go might be some crap in the bottom of them 

[ElkWorks]

my thundercat did this for 35000 miles, didnt change the plugs, or anyhting, just kept on top of oil servicing and put up with it.

fazer does exactly the same, but all i do now, as i did with the cat, was change down a gear.

[darrsi]

GOOD NEWS 


I had a hunch after a while that even though i'd changed the air filter about 2 months ago, the bike felt like it had breathing issues.
So yesterday i changed the filter for a K&N, also noticing what a snug and perfect fit it was, compared to the one that was in there.
I just took the bike out for a blast and i can't believe the difference!
[size=1em]All the jittering and jerkiness has disappeared between the 2-3000rpm and when i opened it right up the response was awesome.[/size]
[size=1em]It was like i'd just fed the bike a whole packet of Fisherman's Friends. [/size] :b
[size=1em]The bike was always responsive anyway but now it feels brilliant, and overtaking was just a complete joy with full confidence[/size][size=0.7em].[/size]
[size=1em]Such a simple and cost effective mod. but with fantastic results, that's just made my day [/size]

[red98]

nice one darrsi,i take it your pleased with the filter then  ......just out of interest,what make was the old filter 

[darrsi]

From memory it was Hi-Flo something, but very ill fitting compared to the K&N, not something that bothered me really, as it's not like it was going anywhere.


A fantastic difference though, i highly recommend it by all means, and you don't even have to clean it for 50,000 miles!!!  :eek

[red98]

From memory it was Hi-Flo something, but very ill fitting compared to the K&N, not something that bothered me really, as it's not like it was going anywhere.


A fantastic difference though, i highly recommend it by all means, and you don't even have to clean it for 50,000 miles!!!  :eek

thanks for that DARRSI  [size=78%].....if you have been reading my stuttering post you will know ive got a simular problem[/size] :\ [size=78%],i noticed it shortly after replacing the filter and it sounds as if we had simular ones [/size] :rolleyes [size=78%].....iam trying a few other checks at mo but if i fail to cure the stutter i`ll treat it to a k+n [/size]
glad you got yours sorted..............enjoy your fazer  [size=78%] [/size]

[darrsi]

I'm wondering if there's still the possibility that i had a 'faulty' air filter before, or one that just wasn't the right spec that it should've been?


It's not something that i've ever heard of before but you can get faulty parts in absolutely anything!


Whether the paper was thicker than it should've been, i don't know, but it wouldn't take too much to be off to choke the airways like it obviously did!


@red98, why not just take your filter out and run it down the road for a quick test, preferably not in a sand storm?  :lol

[CRH]

makes sense darrs? if it was thicker..restricting air flow ?..then it would richen things up!!!....you could be on to sumat there??....i looked at my o/e filter itook out b4 changing to KnN and the paper is very thin on that?....sooooooooo :rolleyes

[darrsi]

When you buy something brand new you just presume that it's gonna be okay don't you?


Fortunately, as i've never had this problem before on any bike i've owned i realised that it had only started running rough since i'd changed the filter.


And if you think about it, as time goes on, anything it filters out will make the paper clog even more which is why mine was steadily getting worse.


By jove i think i've cracked it, it's all making perfect sense now!  :lol


So for anyone reading this now, the lesson to be learnt is don't bother buying cheaper paper filters, as firstly it makes no economical sense, and secondly there could well be a faulty/off spec batch floating about that can cause you a world of pain.


The K&N not only does wonderful things to your bike, but they're only £30, with a million mile guarantee, and they tell you not to clean it for the first 50,000 miles!!! Happy days! 


note: I don't work for K&N by the way, but i do think they should buy me a beer at least  :b

[CRH]

..........think you should be awarded .....2012 SALESMAN OF THE YEAR AWARD ...for that speech darrs!!! :rollin :rollin :rollin :rollin :rollin :rollin :rollin :rollin

[darrsi]

Ha ha  :lol


It does make you wonder how many poor sods have gone through a load of trouble because of bad manufacturing though doesn't it?
Like i said earlier if you buy something new you expect it to be good from the off, but with an air filter you can't physically see a problem so it redirects you elsewhere.
I hope red98 finds out that this is his problem too because i think he's just about suffered enough!
I never realised his first post was in March!
His bike won't need servicing for a while though, it's had the full monty done to it  :lol

[CRH]

yes your right what you say?....yam ones arnt cheap!! so i should imagine over 90% of us would opt out for a pattern one??....ok when they brand spanking !! but soon clog up!! like you say mabe thicker paper!!....but KnN is the way to go?...had them in all me bikes so far and only ever cleaned one and re,lubed it!! and that realy didn,t need doing??....yes poor old red as had his share hasnt he??...recon its aged him 10yrs??.....soon be his 60th!!!!!! :lol ....dont f,get a card?? :rollin :rollin :rollin :rollin :rollin :rollin :rollin

[red98]

yes your right what you say?....yam ones arnt cheap!! so i should imagine over 90% of us would opt out for a pattern one??....ok when they brand spanking !! but soon clog up!! like you say mabe thicker paper!!....but KnN is the way to go?...had them in all me bikes so far and only ever cleaned one and re,lubed it!! and that realy didn,t need doing??....yes poor old red as had his share hasnt he??...recon its aged him 10yrs??.....soon be his 60th!!!!!! :lol ....dont f,get a card?? :rollin :rollin :rollin :rollin :rollin :rollin :rollin

60th cheeky fkr  :eek ............................well put darrsi i agree with it all......all this work would have got me down if it was my sole bike....but i have the thou that puts a smile on my face [size=78%].....cant see me ever being without a bike....must be something in my blood[/size]

[red98]

I'm wondering if there's still the possibility that i had a 'faulty' air filter before, or one that just wasn't the right spec that it should've been?


It's not something that i've ever heard of before but you can get faulty parts in absolutely anything!


Whether the paper was thicker than it should've been, i don't know, but it wouldn't take too much to be off to choke the airways like it obviously did!


@red98, why not just take your filter out and run it down the road for a quick test, preferably not in a sand storm?  :lol

yes good tip    i`ll try that once ive had the test ride 

[elbrownos]

Old topic I know, but I gotta ask -
Who rides their Fazer at 2000-2500 rpm??
I don't go below 4000 because its rough as guts. I always thought this is because its outside the engine's rev range. Like trying to drive your car at 500rpm. Am I wrong?

[Dead Eye]

How about when pulling away from a stand still? Or crawling along in traffic that you can't overtake / filter past? Bike is usually idling at 1000-1250 for most of us... I know its being a bit pedantic but there are situations where it will apply.

[darrsi]

Old topic I know, but I gotta ask -
Who rides their Fazer at 2000-2500 rpm??
I don't go below 4000 because its rough as guts. I always thought this is because its outside the engine's rev range. Like trying to drive your car at 500rpm. Am I wrong?

Get your carbs balanced and it will feel like a new bike!!!
4000rpm is too high in traffic, and must be annoying as well.

[elbrownos]

4000 feels perfect to me, its ok down to 3000 and too rough below that. What rpm do you change at? I change up at 5000 (normal riding)

[darrsi]

4000 feels perfect to me, its ok down to 3000 and too rough below that. What rpm do you change at? I change up at 5000 (normal riding)

I just rode home from work and thinking about what you said earlier i looked at my RPM, (not something i normally do), and although i think i only went up to about 40mph due to rush hour traffic my revs didn't even touch 4000rpm!
The needle was bouncing between 2000 and 3400, but running along nicely at about 3200rpm.
So basically it sounds like you are either revving the nuts off it because your carbs are out of sync, or you are riding too aggressively, but my money is on the carbs after what i just saw on my own bike.
I'm not really one for watching the rev counter, i prefer to keep my eyes on who's about to walk out on me or pull out on me instead!

[Yamazer-92]

Just read this post and found it interesting, had a few hours spare so went out and got my air filter out to see what it is and the condition of it. Holy crap. The filter wasn't too bad, a bit dirty but nothing major for being on there almost a year but the airbox had loads of emulsified oil in. Not really sure why it was there, I cleaned it out anyway. There was also loads of oil dripping from the spongy bit of the bottom of the filter too so I dried all that out and applied a thin smearing of new oil. It's not a K & N one and I will put one of them in if I decide to keep the Fazer (looking likely unless I utterly love the test ride on a supermoto) but it's made a huge difference to how the bike feels low down and has stopped the revs dropping before I pull away.