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frustration
larrythelathe - 12/5/08 at 07:55 AM

I still have my odd problem i drive along put my foot down and the engine goes burrrr burrr sometimes if i dip the clutch and rev it again it clears however sometimes it dies.

I have tried the following

new coils
new plugs
new rectifier (added a fan to keep it nice and coil.
Balance carbs they are spot on.

it's driving me nuts not being able to find the fault, any ideas will be most welcome.

BenB - 12/5/08 at 07:59 AM

Hesitation on WOT?
What engine / carbs are you running?

Usually I'd worry about the accelerator pumps but seeing as you're in the BEC section you're probably running CV type carbs which don't have any

larrythelathe - 12/5/08 at 08:00 AM

its a zx9r e series the carbs however are c series.

Mr Whippy - 12/5/08 at 08:04 AM

sounds more like and ignition fault, like a poor spark

BenB - 12/5/08 at 08:06 AM

This might help

http://www.highlifter.com/forum/m_1872049/mpage_1/key_/tm.htm

Then again it sounds like banjo playing cowboys. Yeeehaaaa!

I suspect the problem is more run of the mill than needing to drill out jet holes...

larrythelathe - 12/5/08 at 08:06 AM

it only does it after 8/9 miles of driving its driving me nuts.
if i stop for 30 seconds all returns to normal.

r1_pete - 12/5/08 at 08:09 AM

Are the carb slides sticking?

BTW what is 'WOT' an abbreviation for?

larrythelathe - 12/5/08 at 08:10 AM

so do i have these pilot screws on a zx9 carb?
I thought i could only changed the mixture by changing the jets?

[Edited on 12/5/08 by larrythelathe]

Triton - 12/5/08 at 08:17 AM

quote:
Originally posted by r1_pete
Are the carb slides sticking?

BTW what is 'WOT' an abbreviation for?


wide open throttle...by any chance?

andyharding - 12/5/08 at 08:17 AM

Think your looking to make a mountain out of a molehill sounds like fuel starvation to me. Either your fuel pump can't keep up of the pickup is in the wrong place. I.E. on tickover all is fine, driving you slowly empty the float bowls and then stopping for 30 secs is enough to allow them to refill.

Triton - 12/5/08 at 08:18 AM

Can change needle and springs with a dyno jet kit

Guinness - 12/5/08 at 08:18 AM

quote:
Originally posted by r1_pete
BTW what is 'WOT' an abbreviation for?


Wide Open Throttle, in other words the normal position

Larry, have you checked the fuel filter / air admittance into the tank? I had an old VW Scirocco that used to start fine, drive for 20 mins then splutter and die. Fine for my commute but I couldn't go any further! It would start again almost immediately and run for another 10 mins.

After loads of trial and error it turned out to be crud in the tank was being sucked towards the outlet from the tank and starving the fuel pump. I'd changed the fuel filters, but this was so bad it was blocking the outlet from the tank. Took the tank off, swilled it about and drained it off a few times cured it.

It could be crap being pulled into the filter?

Or an air lock in the tank? Do you have a breather / air admittance valve?

Failing that, possibly the spark plug leads breaking down when the engine warms up? But that wouldn't explain the ability to re-start and run OK.

Mike

larrythelathe - 12/5/08 at 09:00 AM

I will look into the fuel at lunch time
It is pumped from the tank thro to a regulator looks like a disc thing.
Also i will check to see if i have a filter in the system.

The wife had never heard me curse as much as yesterday!! for future reference she left me be for a good few hours after so i did learn something

JimM - 12/5/08 at 11:42 AM

I'd go with the fuel pump / filter problem as well. I had similar problem which was cured by changing pump and adding a regulator and setting to 3 psi. Check what pressure you have ...

larrythelathe - 12/5/08 at 11:53 AM

filter in the pump is nice and clean
i have a petrol king fuel saver
i needed to find out how to increase the pressure

Crazy Eddie - 12/5/08 at 05:51 PM

ZX9R could be different to blade but this I'll explaine my issues and see if anyone can confirm.

Did have facelet (or whatever the things are called) pump and Fuel pressure regulator. IMHO Bag of Sh*te and never got it working properly.
Got rid of the lot (pump and regulator) and just fitted a blade pump - all was sorted.
Hope this helps
Cheers
Eddie

larrythelathe - 12/5/08 at 06:12 PM

I upped to fuel pressure to 8 psi (gauge was made in 1921 for a old truck!! thanks Andy)
Sure thats too much but.........................

It works and at last i have been able to blast the E series and it goes like stink!!!!

Thanks to all who helped me with advice i am very grateful