I know its not the same bike(mines a 1985 GPz750A3) but I have had issues with poor bike idling and starting after rebuilding the carbs. I am now 99% sure it is the air filter not sitting properly in the air box( standard airbox and new genuine Kawasaki filter).. I think the plastic air box has dist...

MoT passed today.

Nearly finished the rebuild of my GPz750. Taken off the road in 1999 by the previous owner and left in his garage until I bought it in early 2015. Stripped down, cleaned and re-assembled using new parts where needed. Bought the Harris pipe before I bought the bike. Repaired and re-chromed that aswel...

Had the bike running again today and it does seem a bit better. The main problem I found initially was that the plastic air filter cap didn't sit down properly. It looked to be in position, and I had the bike ticking over at 1000 rpm. I then pushed down on the filtercap and the revs suddenly shot up...

I have a Harris pipe to fit to my GPz750A3. (Genuine harris not a repro). Tried fittting it with standard exhaust collars but hardly any stud is pokeing through the clamp. They are new standard kawasaki collets, the clamps that came with the bike and the correct head exhaust studs. Anyone else had t...

Thanks for the info. Checked the float valves against the old ones and the new ones are about 1mm shorter. The depth of the drilling in the brass bit is shallower. So I guess this allows for it. The floats aren't catching on anything. I put one of the floats in water last night and it seemed fine. I...

If I drain the fuel from each bowl I am getting about 60ml of fuel out of each carb. Looking at the tang with the carbs fitted to the bike and the bowl removed the tang is bent towards the floor.i.e away from the needle valve, so the float has to rise further to shut the valve off. Increasing the fu...

I'm really struggling now. When I took the float bowl off the bowl was full of fuel, like 6-7mm from the top of the bowl..when i take the fuel height measurement its still 20mm from the split line of the bowl/carb. Any ideas?

Replaced everything in the kit. I did have to bend the float tangs a long way from where they were to get the book figure of 18.6mm. Gravity fed the carbs last night and had 20mm fuel height from the carb split line. Will try again and open the tank cap just to see if the breather is blocked. If the...

Been a while, but I have rebuilt the engine now.
I have checked the fuel levels and they seem to be 20mm below the carb split line. Book says 3mm. Float heights are as per book at 18.6mm. Bike is GPz750A3. Carbs are BS34 Mikunis. Rebuilt with Keyster kits. Any ideas anyone?

Does anyone know where can I buy a rotor remover and holding tool from?(to remove the rotor from the crank) Its for a GPz750A3.
Thanks

I'm thinking it may be piston to bore clearance rather than ignition, unless the piston is getting too hot and expanding to fill the bore. There are no signs of detonation.

Took the head off today, then removed the barrels. No.1 cylinder looks like it has seized on the skirt and has deposited ally on the wall of the cylinder. No.4 is also showing signs. No.s 2&3 look OK. Don't think its the carbs as the pilot galleries are all clear. Probably look to re-bore it lat...

These are uk spec carbs. From memory tge pilot jets were replaced but i will check when i remove the float bowls. Pressure in my air line is 5 bar or approx 75psi. Might remove the heads and relap the valves in if necessary.

They were new o rings from the keyster kits. Clearances were ok with one cylinder at 0.025mm, two cylinders at 0.076mm and the rest in spec. In process of changing these now.
I havn't measured compression yet. Its a standard air box with standard new filter.
Yes 34mm CV carbs.