An update on the zxr, not revving past 7k

[4Stroke]

Hi guys. Sorry to keep bangin on about this but would like to post an update in a new thread as the problem seems to be different to what previously thought.

Bike won't rev past 7k essentially it starts miss-firing and sounds like it starts running on 3/2 cylinders but it's varible sometimes it's 5k and sometimes its 8k. Occasionally it's been 2k. Seems to happen more when wet out but happens when bone dry also(like today).

I've now done the following.
Change HT leads and coils (but not the caps though they are in superb condition the fact i'm getting quoted £25 each is stopping me trying this)
New spark plugs.
Different igniter(cdi)
Charged battery.
Overhauled the carbs fully cleaned all jets and went back to factory default size jets and reset float height as per manual and reinstalled stanard needles to start with blank slate. Check carb diaphragms for splits etc also.
Contact cleaned and checked all wires to do with ignition etc.

Only things I've got on my list now are carb inlet boots and timing rotor and associated pickup coil on that.

Absolutely crazy and there must be a simple problem here somewhere.

[4Stroke]

[4Stroke]

[DaveH]

Also might be worth making sure that all the earth points are clean and tight.
____________________
https://www.timhastingsracing.co.uk/

ZX7R & ER6F

[thefallenange...]

not a reg/rec is it? Causing crazy electrical faults?

Rev up to 5k and put a meter across the output to the battery to check. Also check the battery voltage when revving incase it's goosed the battery too but i doubt it.
____________________
Past - CG125 ,KR1S, SV650s, Street Triple R - Current - Duke 390

r.bridge1988@gmail.com

[4Stroke]

[thefallenange...]

[4Stroke]

Took it out for a spin when the snow cleared just to get a feel for what its like again and under load when reving it definitely missfires on 1 or more. If you rev it freely then it will almost redline and rev higher than when under load.

Weak spark/ignition fault surely?

[4Stroke]

[Bikeless]

Sounds ignition related,either your timing not advancing or a faulty coil pack.

Check your pulse generator coil fixings and trace the wires back to the coils.

[4Stroke]

Yeh one of tje few things left on my list is pickup coil/timing rotor.

I've contact cleaned wires runing to pickup coil and I do have a spare on my other zxr but I can see it as being plug and play swap though admittedly haven't had a good look yet.

[4Stroke]

Right last night I spent from 8 till 12 on it.
I checked the plugs and revved it an the spark timing seemed to increase dramatically with the engine revs.

The spark also seemed to remain 'in time' with the engine note if that makes sense.

I checked out the fuel pump and fuel pump relay, pump seems to be working ok, tried another rely.

Found a load of wires and block connectors under the airbox near the startor and engine earth my haynes doesn't seem to mention, some of which were corroded so sorted them out.

Yet it's still exactly the same...

[DaveH]

Were the earths on battery, frame and engine all clean and tight - no dodgy looking wires?
____________________
https://www.timhastingsracing.co.uk/

ZX7R & ER6F

[4Stroke]

[4Stroke]

Is anyone in the devon/somerset area who could meet up to perhaps shed some light on this?

Maybe an outside opinion could work wonders very least I may be missing something but being too invovled.
Crate of bear? bottle of wine?

Just be grateful for a second opinion.
If not I'm going to see if I can live with it till next month then take it to someone once I have a little more cash.

[4Stroke]

Ok guys, a hopefully final update on this.

If we look back about when I first posted an issue with this the problem was misfiring and stuttering and reall running issues when it was wet and damp out.

As progress went on and I started delving deeper and swapping bits out and refurbing bits the problem kind of morphed into the OP above.

A final update... The initial issue of nasty running problems in the wet seems to have been solved, hell I rode it in todays downpour 25 miles and it didn't miss a beat.

Secondly the problem posted above was likely my own fault as I rebuilt the carbs in a vain attempt to eliminate them from the equation I didn't do two of the main jets back up (as I rejetted back to factory) so as a result of pulling the carbs again today I found two main jets rolling around the float bowls.

Screwed them back in the emulsion tubes and she's running great through-out.

Also I have hopefully eliminated the original issue as I have pretty much swapped out everything electrical and as I said earlier rode today in the down pour and was magic.

Big thanks to all who helped and the patience you guys had with me also.

[DaveH]

Good news and well done
____________________
https://www.timhastingsracing.co.uk/

ZX7R & ER6F