fuel/air mixture?

[carrier]

A brand new problem.. or is it related?


So it's had two episodes where it was hard to start, had to run the starter for a while and then a nice loud back fire then could ride no problems. The other time it started but wouldn't rev up when I turned the throttle, it would hesitate for a bit and then it would open up. I'm guessing my fuel/air mixture is too rich and I'm flooding the engine... should I play with the screw?


Thanks!

[Dead Eye]

I have this issue - if I get the bike to start straight away then I have to hold the throttle open a bit until the revs begin to climb. Then I can safely put the choke on. If it doesn't start first time, or it dies then it becomes a bugger to get started. I end up thumbing the starter and rocking the throttle open and closed slightly until it catches and starts up. I've kind of gotten used to it and this is only the case when the bike is cold

I don't think I have a fuel mixture issue though, as it was definitely over-fuelling before and after its been adjusted the problem still exists

[carrier]

If I touch the throttle I can forget it starting and will have to wait, so I don't think it's the same thing

[Dead Eye]

Ah fair enough, sounded similar

I'd be inclined to check your spark before looking at the fuel mixture. As the fuel mixture, unless its completely out of wack should still allow you to start and run the bike - albeit potentially roughly / badly

[carrier]

poop, it runs fine... just starting it. I'll try snipping the cables see if that helps. Thanks deadeye!

[Dead Eye]

I knew mine was over-fuelling before because it would bog down a bit at higher revs and didn't pull anywhere near as well as my previous Fazer. After the adjustment its running a lot better but I still have the starting issue.

I changed two plugs a couple of months ago and that seemed to help a little - I would have done all 4 but the two inner ones (on cylinders 2 + 3) were quite tight and I didn't want to risk snapping them

[carrier]

Is it just when it's cold that you have the starting problem? Me it doesn't matter if it's hot or cold. I could go for an hour ride and turn it off for a second and will be difficult to start.

[rufus t glasgow]

i have a similar problem.


she will start fine, but if i quickly open the throttle the engine will die. Also, unless i have the choke on so that she is reving around 2k-2.5k the engine won't rev past 3.5k-4k.


tis a bugger.


I need to put new carb rubbers on the engine and the carbs could probably do with a good clean.

[darrsi]

i have a similar problem.


she will start fine, but if i quickly open the throttle the engine will die. Also, unless i have the choke on so that she is reving around 2k-2.5k the engine won't rev past 3.5k-4k.


tis a bugger.


I need to put new carb rubbers on the engine and the carbs could probably do with a good clean.

Have you just solved your own problem?
Any air leaks from carb rubbers will give the feeling of bogging down on hard acceleration.
I found this out when a mechanic managed to fold a rubber in half on reassembly!

[rufus t glasgow]

[quote author=rufus t glasgow link=topic=7833.msg76512#msg76512 date=1368714269]
i have a similar problem.


she will start fine, but if i quickly open the throttle the engine will die. Also, unless i have the choke on so that she is reving around 2k-2.5k the engine won't rev past 3.5k-4k.


tis a bugger.


I need to put new carb rubbers on the engine and the carbs could probably do with a good clean.

Have you just solved your own problem?
Any air leaks from carb rubbers will give the feeling of bogging down on hard acceleration.
I found this out when a mechanic managed to fold a rubber in half on reassembly!
[/quote]


not yet. I've gotta sort out ma blowing exhaust then sweet talk some lectuers so i can take her into the uni workshop and put the new ones one. Also from reading this post i've probably got some water in the tank.

[darrsi]

[quote author=darrsi link=topic=7833.msg76519#msg76519 date=1368716459]
[quote author=rufus t glasgow link=topic=7833.msg76512#msg76512 date=1368714269]
i have a similar problem.


she will start fine, but if i quickly open the throttle the engine will die. Also, unless i have the choke on so that she is reving around 2k-2.5k the engine won't rev past 3.5k-4k.


tis a bugger.


I need to put new carb rubbers on the engine and the carbs could probably do with a good clean.

Have you just solved your own problem?
Any air leaks from carb rubbers will give the feeling of bogging down on hard acceleration.
I found this out when a mechanic managed to fold a rubber in half on reassembly!
[/quote]


not yet. I've gotta sort out ma blowing exhaust then sweet talk some lectuers so i can take her into the uni workshop and put the new ones one. Also from reading this post i've probably got some water in the tank.
[/quote]

There is an alternative way to sort water in the tank, buy a litre of 99% Isopropyl Alcohol and put in 300ml per full tank of petrol.
It binds with water and gets burnt off as fuel. 

[rufus t glasgow]

[quote author=rufus t glasgow link=topic=7833.msg76521#msg76521 date=1368717044]
[quote author=darrsi link=topic=7833.msg76519#msg76519 date=1368716459]
[quote author=rufus t glasgow link=topic=7833.msg76512#msg76512 date=1368714269]
i have a similar problem.


she will start fine, but if i quickly open the throttle the engine will die. Also, unless i have the choke on so that she is reving around 2k-2.5k the engine won't rev past 3.5k-4k.


tis a bugger.


I need to put new carb rubbers on the engine and the carbs could probably do with a good clean.

Have you just solved your own problem?
Any air leaks from carb rubbers will give the feeling of bogging down on hard acceleration.
I found this out when a mechanic managed to fold a rubber in half on reassembly!
[/quote]


not yet. I've gotta sort out ma blowing exhaust then sweet talk some lectuers so i can take her into the uni workshop and put the new ones one. Also from reading this post i've probably got some water in the tank.
[/quote]

There is an alternative way to sort water in the tank, buy a litre of 99% Isopropyl Alcohol and put in 300ml per full tank of petrol.
It binds with water and gets burnt off as fuel. 
[/quote]


i'll defeinently give that a try one i got the end can and carb rubbers sorted.

[darrsi]

Make sure it's 99+% and not the 70% one, otherwise you'll be adding 30% water into the tank!!

[carrier]

shall I consider this thread thoroughly hijacked?

[rufus t glasgow]

Make sure it's 99+% and not the 70% one, otherwise you'll be adding 30% water into the tank!!

will do

shall I consider this thread thoroughly hijacked?

possibly, but its all good info anyways

[Dead Eye]

Is it just when it's cold that you have the starting problem? Me it doesn't matter if it's hot or cold. I could go for an hour ride and turn it off for a second and will be difficult to start.

Nope, mine only does it when cold. Can go out for 20 mins, park up for half an hour and it will start fine - sorry I can't be more helpful

I'm surprised, it's usually me doing the hijacking  :hijack :lol


I guess at the end of the day it couldn't hurt to try and fiddle with the mixture screws but be warned they are made of cheese so are difficult to adjust unless you remove the carbs (which isn't a particularly quick job). Stuffing some 99% alcohol in to the tank as darrsi suggested isn't a bad move and won't do any harm and whilst you're at it you may as well drain the float bowls if going this route. If this doesn't help, I'd start looking at the electrics / spark as I mentioned earlier

Let us know how you get on

[WookieoToole]

Scuse me for poppin me 2 penneth in but ah BET its an air leak either from perished inlet rubbers or loose clips on the air box rubbers --just fettled 2 bikes with identicle probs -- however also the idle jet could be varnished up so its carbs off and clean the gallerys with a good solvent -- also if you are running a freeflow zorst and or a K&N air filter it would pay you to raise the carb needle one notch ------hope this helps
WoOk 

[carrier]

thanks, but turns out it's actually the starter solenoid acting weird. If I wait for it to "tick" bike starts fine, if I don't it just turns.