Info Video on Pilot Air/Fuel Screw Adjustment explanation.

Quick update. Did a little bit of fine tuning yesterday. Ended up going leaner by half a turn on the pilot screw.

Went for a ride this afternoon and what a difference that made. Bike goes much better now. Also smoother with noticeably less vibration throughout the whole bike.

Before the adjustments, I could feel the vibrations through the fuel tank, foot pegs - the right footpeg being quite bad and the handlebars - which was why I added the heavy bar end weights.

After going another 1/2 turn leaner, the overall vibration throughout the bike has very noticeably decrease a large amount. It's only just noticeable now even at 8000rpm (100kph in 6th gear). Bike revs very nicely. Revs drop to idle with no hanging over idle or dipping below idle. Choke works and I can now take off in 1st gear without revving it up too much.

About the only thing I might be tempted to do now is to change the needle height slightly - just to see what happens. Again, the bike isn't a fire breather, but is now running noticeably much better than it was before.

Now to try and sort out that temp gauge. But if not, I might buy a cheap digital one from ebay/aliexpress. I've already checked and cleaned all the electrical connections on the temp gauge wiring and @Murdo installed a new temp sensor and thermostat during the build - so that rules out those parts possibly being faulty I would think.

 

Yes. You read so much about putting larger jets in bike to make them perform better.
My experience, backed up by tuning on the dyno, is that you often fine a bit more performance by going leaner.
My track bike has smaller jets than standard.

 

Hi,

Just came across this thread. Really interesting! I have a Suzuki GSX250 Bandit that I've just got back on the road after a 5-year layup and I'm having exactly the issues that @BlueDragon described with his ZZR250. The video is really informative. I've cleaned the carbs and they are most definitely fuel pilot screws. I've got them at just 1 turn out (as specified here - http://www1.synapse.ne.jp/s-hara/bandit/ban-sdatae.html#carburetor) and the bike appears to be running rich (bogs/stalls at low rpm). At only 1 turn out, there's not much room to turn further in. I think I'll invest in a carby adjustment tool and have a play...

 

UH OH, you mentioned the 'larger jets', beware there may be an incoming @maelstrom - LOL