Engine Revs Drop

[Kevin]

Hi all
I have just got my Z900 back up and running and I am hoping to bring it to the rally in Ireland. The following are the problems I am suffering since I took it for a test ride. When the bike is stationary and you open the throttle there is a small delay in the response to the throttle also when the engine is running and you select first gear the revs drop so low that you have to open the throttle further to get enough revs to start moving. If you don't open the throttle it sounds like the engine is going to die. I also notice that when I close the throttle the revs don't drop immediately again there is another delay in response to the throttle. I have had the carbs off the bike for servicing and this was the first time I took the bike for a spin

On the road the bike seem to run OK. Has anyone ever suffered this before, if so what was the problem. I would appreciate any help or advise as to what the problem is.

Thanks

Kevin

[paul doran]

Kevin have you balanced the carbs since you refitted them
If not give me a call and I will loan you my vacum gauges

[Garn 1]

Kevin, I have had a similar problem. Regret balancing wasn't the answer to my problem.
These were some of the recommendations I was given to look at:

Check for sticking trottle cables.
Check the manifolds with carb spray... Should change in revs if leaking!
Changed out the whole plate new points and condensor.
Reset carbs idle and set air bleeds at 1.5 turns.
Check springs on advance/retarding mechanism - arms not retracting all the way because springs are slack. Swap out with a tighter spring.
I was also told that a leaking exhaust can cause this lack throttle response.

There is nothing like a crisp throttle reponse!
RegardZ

[paul doran]

well I had similar problem's with my Z1B and carb balancing sorted it
a process of elimination really
or it could be dodgy pilot jets

[Kevin]

Thanks Paul, Garn 1,
I will take the advice and go through the process of elminating each possiblity reason which may cause the problem. I will check the setup of the throttle cables etc and see where that takes me. Paul I will give you a call ref the balancing of the carbs. I will let you know how I get on.

Thanks Again

[paul doran]

okay guys went down to Kevin;s house today armed with my vacum gauges
reset the carbs and mixture screws
problem solved
Kevin's bike looks great by the way

[Garn 1]

Paul, I will bow to that 'carb-balancing' diagnosis. Great that Kevin's problem is solved. Was one carb miles out, or was it just a general out of balance?

RegardZ.

[paul doran]

Garn
just one carb was out and the mixture screw's were way out

[paul doran]

it is amazing what a few small adjustment's can do