99 suzuki katana 600 exhaust issue startup problem.. any expert to help ?

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j s

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Hey Folks!
I've recently acquired a '99 Suzuki Katana 600, which I'm totally loving being on.. however, there's couple of things which do makes me a bit uncomfortable, and I can't help thinking of fixing them somehow..
just fyi.. I've recently got the Jets changed (replaced a new kit) with the fuel flowing richer than usual..
Now, for starters, I'm facing ignition / startup problems in the morning.. although it's cold here, but still it takes quite a while, and after starting the first time, the rpm gets lower and lower and ultimately the engine stops.. (even using choke)
Then comes the part where I have to throttle it a bit to start, and it gives out quite some smoke too..
Soon after it's up, I still get the engine cutting off on me at certain points, as if the exhaust is choked.. there's quite a lot of backfire pops from the exhaust.. and that continues for the whole time I ride it afterwards..

So, I hope you've got the scenario, and can guide me in the right direction.. :)

Thanks in advance..

J.
 
did you think to check the timing after re-jettting the carbs? Sometimes (almost always) when you re-jet your carbs the timing needs to be changed to coincide with more gas going into your cylinder and your combustion chamber has more fuel going in to it causing things not to jive, you need to take your cover off at your points and mark it before you move anything (this giving you a point to always come back to) . loosen your screws to adjust the timing plate and start the bike, then after it is warmed up (approximately 5 minutes) make an adjustment, rotating it left or right to see how it sounds, if it sounds like it's running good, and you will know, because it sounds smooth. the next thing you need to do is see that it still starts up easily, and if it starts hard you need to re-adjust the timing until they both coincide, to find a happy medium. Just remember it is no different than a lawnmower engine (4 stroke) , and if you introduce more gas as it is going through it's cycle the spark has to be at the proper time (coincide) to produce a continuous cycle to sustain running. I have worked on engines for 35 years and i am only 44
 
sounds like your too rich.Why did you change jets?Did you fit an after market race exhaust?If not put the standard jets back in.Upjetting a bike than cannot draw more air than standard won't make it run faster ,all that will happen is the extra fuel now being metered into the mix will flood the engine killing performance and costing more to run the bike.The back firing is the unburnt fuel being ignited by the hot exhaust.If you check your plugs they will almost certainly be black with soot,so if it were my bike I'd fit std jets ,clean the plugs and take it fof a blast to clean it out.
 
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