1996 ZX6R Engine Probs

[Guest]

Hi,

Hoping someone can point me in the right direction here.

Bought a 1996 ZX6R recently that has been streetfightered.

Previous owner admitted the engine had been running rough. A change of sparkplugs hadn't helped and he didn't think there was a coil problem.

Bike is inconsistent with the problem. Sometimes I can start it and it runs fine then starts missing after a short while. Sometimes it runs rough then it will run smooth for awhile. It will do this several times on a 10 mile run. I find that lower revs definitely makes the problem worse.

If I am on the motorway doing a decent speed it will mostly run OK - until you wind on and off the throttle then there is a massive lag before the revs pick up again.

I took the tank off to have a look at the wiring - was also going to have a look at the carbs but a previous owner has rounded off the screws holding the covers on. Didn't want to strip them just yet in case there is a more obvious answer.

The bike has an after market can on - a motad viper - could this cause these problems.

Plus it doesn't matter if the engine is either hot or cold - it will still start missing.

I can get by with basic bike mechanics but this has me stumped - plus I don't have a lot of tools or equipment to check electrics etc.

Does anyone have any ideas?

[mattycoops43]

Intermittent problems, I have had exactly the same with my XJ. It will be fuel related, check for crap in the carbs, blocked jets, does it have a paper fuel filter? they are rubbish, mine was letting clods of old paper through into the fuel pump and carbs.

Float height in the carbs, and balance too.

[Guest]

The fuel filter looked okay - but it looks as though I am going to have to strip the fuel system down and have a proper look. Thanks for the tip.

[Stu]

Does it have a fuel pump? If so check it out I know some older zx6's suffer with the fuel pump not sure which year though

Also check wiring connections as it could be just a loose wire

And as above check fuel system