HELP.. Power lag issue

S

sp1012

Well-known member
Hello Everyone,

Bike in Q is 1998 ZX-6R.

Problem : When I am going at constant speed (e.g 100kph) for a bit, and I try to give it by turning the throttle fast.. it experiences sort of a power loss for 2-3 seconds before it picks it up and goes. I have experienced this few times now so I figure its not me.

Note: I recently changed spark plugs.

It would be great if anyone can guide me in right direction in what should be looking at.

Thanks in advance
 
sp1012 said:
Hello Everyone,

Bike in Q is 1998 ZX-6R.

Problem : When I am going at constant speed (e.g 100kph) for a bit, and I try to give it by turning the throttle fast.. it experiences sort of a power loss for 2-3 seconds before it picks it up and goes. I have experienced this few times now so I figure its not me.

Note: I recently changed spark plugs.

It would be great if anyone can guide me in right direction in what should be looking at.

Thanks in advance
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Is it like that in every gear , or just a particular one?

I found on my ol kawi that one of the jets was starting to clog. You can try running Seafoam through your bike.
 
Also, it is old and carbed so that could be it. dont wanna spend too much time and money taking it apart.
 
sp1012 said:
Also, it is old and carbed so that could be it. dont wanna spend too much time and money taking it apart.
Click to expand...

If it makes it run like it should why on earth not??? Unless its old and decrepit. Even then if its the bike I had to work with make it run.

If your rpm's are too low when you throttle down its gona lag until it picks up speed. Where do you cruise at
 
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You made a point of mentioning that you recently changed the spark plugs. Did you mean to imply that the bike ran fine before the spark plug change, and now it doesn't? Did the problem start immediately after the plug change? Or was it a preexisting condition? Or did it start sometime after the plug change, but not immediately after? If it was after the plug change you might want to go back over what you did, and make sure you didn't loosen or accidentally pull off any vacuum lines from the carbs, or mess up any other connections / hoses, or pinch any lines.
 
hows the fuel pump / tank on your bike?
 
Slipping clutch, worn out plates possibly
 
Power loss or power lag? How does the engine sound while this is happening? Did the replacement of spark plugs make it any better? Also, are there any other symptoms?

If your bike is EFI (some bikes in 1998 were) It could be a voltage related problem. Try charging the battery completely and take it for a ride immediately after. See if it still lags. If yes then it is either the battery or an electrical component thats gone wonky and is draining your battery.
 
I'd put money on fuel starvation. Sounds like what happened to me when a fuel line was clogged. Check out the fuel system like infernobuster and freakeyguy said.
 
I started noticing this after i changed plugs. so I will be opening her up to see whats going on. going to follow the check list
- check plugs and gap
- check vacuum lines
- clean air filter and re oil (k&n)
- run seafoam
- fuel pump ( it seems to be after market .. prob previous owner put it in)
i will report back to see if it took care of it..
 
ok so I could not get to all of it but did check plugs gap cleaned air filter (still waiting to dry and re oil and install today)

meanwhile, I noticed this T-piece came out of carbs (attached drawings) .. I wonder if this could cause the lag

tsts.png

ucko.png
 
sp1012 said:
ok so I could not get to all of it but did check plugs gap cleaned air filter (still waiting to dry and re oil and install today)

meanwhile, I noticed this T-piece came out of carbs (attached drawings) .. I wonder if this could cause the lag
Click to expand...

It's hard to tell from the diagram, but detached hoses and connections of any kind(that normally are attached) will generally result in a poor running bike. Hook it up, double check all the other hoses and connections that could have been dislodged or loosened, and give it a go. Let us know.
 
If the hose in question is what I think it is ... it is part of the ram-air system, which is meant to equalize the pressure in the carburetor float bowls to the ram-air pressure in the intake duct. If that is not connected to the carbs, it WILL make the bike run very badly at higher speed. It will run okay at lower speeds or when stopped (e.g. on a dynamometer) but higher road speeds will result in a fuel-starvation condition.

Make sure all the ram air hoses are connected properly all the way from the ram air ducts to the carb vent hoses!
 
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