throttle / fueling problem .

[JulianWerner]

Hi guys

I could really use some help.

I bought the bike in oktober 2012, but because of bad carbs +++ and snow i never actually tried it out.

So i bought some carbs of ebay, and cleaned them.
New spark plugs, new fuel filter, ned HT- leads ++++

And then the other day i finally got it running. so i balanced the carbs and the day after i took the bike out for a spin.
I noticed some things like, when i take the clutch fully in the bike dies (in speed) so i give it some gas when i want to change gear.
But the odd thing is that the bike has a good idle when in neutral on side stand in my garage. (?)

Also when i for example stop at a red light and i am going to start driving again, it a struggle to keep it alive.
When i give to much throttle it dies.

Now for my main problem.

The day after my first ride, the bike was outside in the storm all night.
The bike fires up with choke, and when i take in the clutch and take it to 1 gear and slowly releasing the clutch it just dies. ??

after several tries the bike dosent start, not even after 2 days.


I talked with some friends saying that maybe it is old gasoline or water in the tank or something.
And i realized that i drove it on reserve (i think ?!).

Anyway, what should i do? the bike was sitting when i bought it, and been in my garage since oktober with a half tank of gas.

Some ideas ???

I really appreciate replies !

[banner001]

sounds like you are lean on the idle/pilot circuits hence the need for choke to get the bike going, and it sounds like you are rich on midrange/top end...before i sorted my bike i needed to open the clutch at high rpm to get the bike runnig properly, if i tried to slow down then it died when i pulled in the clutch.

to check:-
how many turns counterclockwise, from fully turned in (thats clockwise), are your pilot air screws?

what main jets are you running?

what air filter/downpipes/exhaust are you running?

what needles are you using, dynojets or standard, and have you shimmed them?

and yes, dont run the bike with stale fuel, it will give you all sorts of wierd readings, so only try the bike with fresh fuel.

[JulianWerner]

Hi.

thank you so much for the answer

my pilot screws are 2 , 1/4 turns out .
i have the original pipes, exhaust and standard air filter.
needles are standard.

i emptied the fuel from my carbs and charged my battery.
It fired, instantly !!
when i drive about 60 km/h and give it full throttle its no problem.
but sometimes the revs is living its own life


its cold and rainy outside, and when the bike is hot i noticed the radiator "smoking" a little bit, and underneath one of the down pipes its also steaming a little bit.
is this something to be worried about?

[ross46]

Check the front of your engine, just changed my head gasket because I had an external leak from the front of the engine, I noticed it after coming back after caning the bike with my mate on the back (shook him up when I scraped his footpeg on the floor!) I got of the bike and heard sizzling where coolant was dripping from inbetween the head and cylinders onto the exhaust, have you checked your coolant levels? If you havnt got enough coolant then the engine will run alot hotter changing the ratio and making idle erratic when warm, check your coolant levels, top up both rad and expansion bottle, go out for a ride and check when you get back (let it cool first obviously), if its dropped then there's a problem somewhere

[RedexRobB]

If its raining then its perfectly normal for the radiator to steam. Water on a hot surface will steam of course.

[JulianWerner]

Hi guys ..

Thanks for replying

Redex, i noticed today driving my Aprilia RS 125. But thanks for letting me know for sure

Ross, i checked the coolant level, its fine.

I took out my spark plugs today, was quite good. (changed them last month)
I put fresh fuel in my tank, and emptied the carbs.

Charged the battery and still no fire !
Its like its now even trying.

It ran okay, but when i ran out off fuel yesterday, it havent started since.


I am thinking of buying a new battery, i read here somewhere that the zxr need alot of power to start.
Maybe the one in my bike is getting bad.

Some more ideas?

It is killing me,

[ross46]

is it sparking? nice strong spark? it could be youve got water in some connectors somewhere and thats shorted it out somewhere?

[JulianWerner]

Hi, thanks for reply!

It don't get it, why wouldn't the spark plugs fire anymore.
just out of thin air.

The coils are not old, new HT leads, new plugs.

Could it be the valves ?
I haven't checked them, and i don't know when they were checked last time. And i really don't know how to check / adjust them.
Watched some youtube vids. but i am no mechanic :p

On my aprilia i just screw out the spark plug, and layed it on metall and pressed the starter. to check for spark.
Is it the same on the ZXR ?

[Darkzy43]

Yup same procedure on any engine

[JulianWerner]

I tried some starter gas in the air intake, and it fired up, but died 2 seconds later.
So i have spark, i am now cleaning the carbs.

But, when i took the carb bowls off, and cleaned.
Now i can not get the gasket back on, its to big / stretch ??
The gaskets are 1 month old !?


Do someone know how to fix this ? if not i have to wait like 2 weeks to get new ones.

[RedexRobB]

Chances are its swollen because fuel has gitten on it. Youll have replace them id have thought.

[ross46]

Is your fuel pump working? Are both coils working? Sparking on all cylinders?

[JulianWerner]

Cleaned my carbs, now it working again ..

I also changed oil and oil filter.

EDIT:

I also ordered a cam cover gasket from Ebay. Because mine is leaking a little bit..
Was fuel (ish) drop coming out, so i gonna change it.

When the bike is cold, it need full choke when driving, and if i give gas it is sort of drowning, but after 1 - 2 minutes, i take the choke off, and "force" the bike over 6 k rev.
And after that its running nicely.
Steady in the revs.

Whats wrong ?
Fuel / air mix ?

[banner001]

if you need choke to get the bike to idle its either incorrectly adjusted idle speed cable (by your right leg) or your pilot air screws are very lean, screw all 4 counterclockwise by 1/2 a turn and see what happens...that should richen your idle circuit, you want the bike to be idling about 1100-1400 rpm.

if you need choke whilst riding then you are lean (not good) so you either have 1. a fuel blockage or 2. too small jets/needles too lean.

if you need choke from idle - 4k rpm and with low throttle openings of ~1/4 open, then you are probably lean on the pilot air screws - but as you will be adjusting these above only change these if necessary.

if you need choke in the midrange, so with ~1/2 throttle and rpm of 4-8k rpm then your needles are probably lean (the N77S is a lean needle), buy some M3 shims and shim the needle up between 1-4 shims (0.05 - 2mm higher than before), this will richen the midrange.

if you need choke from 8k rpm upwards with full open throttle then your mains are too small, go up in 2 size increments and see if that changes things, i.e. if you have 95's fit 100's and see if that changes things.

if its still bad its most likely a blockage of one of the small passageways in the carb...