the wired George mod melted my coils

10% variability between cylinders might be OK

the manual should tell you. 140-160 might be ball park figures. When my Zed needed a rebore the compressions were 85-120 ish. But it was BAD . I rode from my house to a friend in East Kilbride and it used £15 of petrol and £20 of oil.

see photo

check the springs on the autoadvancer aren't weak - if they are, so the engine is running on full advance even at low revs, this will cause low speed hesitancy and good high speed running. With a strobe , check the timing at idling speed, then open the throttle slowly while watching the marks. By 23...

you mentioned the rubber bung is an easy push fit. Try swopping the bungs around, and seeing which one pops out. If its still No 1 cylinder, then the problem is there, if that bung continues to pop out wherever you put it , throw it away and get a new one ( it may be so loose it's letting air by and...

I knew I needed one too for my special project I'm working on so I looked on ebay for other clutch covers with a filler neck that sticks out a bit. GSX550 seemed to fit the bill so I bought it complete with cap ( cheap as it was scuffed and cracked at 1 bolt hole) and I hacksawed out the filler neck...

is the cam timing a tooth out? If the inlet valve was still a bit open as the piston was rising, then you'd get increased inlet tract pressure and it might blow the bungs out. Easy to get it wrong, and the diagrams aren't that clear in the manual - the thing to remember is that ( with No 1 piston at...

I'm not clear yet. Has the ignition been fully excluded as the issue? ( ie swop the dyna pickup feeds, AND swop the plug caps - put 1+4 onto 2+3 and vice versa . It'll still run , but it tests the opposite half of the ignition system - if the pipes that run cool change over too, its an ignition issue.

thinking back to your stuck pilot jet , I have 2 suggestions Both unfortunately involve pulling the carbs off and separating the carbs ( be careful you don't drop the 2 ball bearings on the choke slider bar) Once you have a stripped down No. 3 carb body in your hand, drop it into boiling water for 5...

I find that sometimes if you blow carb cleaner thru a pilot system, it won't clear the block because, going from the rear of the carb to the tiny hole in the carb throat just on the inside side of the slide, the channel get smaller so you're blowing an obstruction down a narrowing tube. I've found t...

I suppose it depends on what kind of restoration you plan to do - if you are entering contours, or just making it pretty good, to please yourself.
No harm in phoning Z power to see what they can do for you - they're very helpful in all Zeddish matters

Look at Z-power's website for your bike and search "stickers"

Tyre pressures make a surprising difference to how the handling feels- Back in the day I used 32 front and 36 back with the tyres of the time, but modern tyres seem to need 34-36 front and 40-42 rear - if your using worn but "modern" tyres, and the pressures you used to use in the 1980s, t...

Maybe the needle positions needs moved a notch ( carbs out job tho' - sorry) - do a plug chop at 1/4 -1/2 throttle open to see what the midrange mixture is looking like. Easy to tell if you have an air leak - some Easystart or other flammable spray eg carb cleaner , sprayed around the back of the en...