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Jetting Issues with 43f XT600 Jetting Issues with 43f XT600
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 12 Sep 2019
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Question Jetting Issues with 43f XT600
Quick description of issue: I have a supertrapp exhuast and air pod filters. I have fully cleaned the carb and rebuilt it.

I get a studder in throttle response around 4500rpm. I adjusted the fuel mixture screw to around 3 turns out and it runs better than if its the stock 2 turns out.

The weird part is im getting carbon builup on my exhaust. Running rich? But in order for it to run good it needs to be rich on the mixture screw... Any solutions. No hard starting or backfiring, idles great. Spark plug suggests possible slightly lean.
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Old 12 Sep 2019
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typical woes of deleting the airbox..... no easy solution. Supertrapps are also an odd system, they work by choking with the end plates, not first time i hear about issues with them
was the bike running right with these mods before? Or it all started after?
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Old 12 Sep 2019
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It had been running the same since I have gotten it. The supertrapp and air pods were already in place and I would like to keep them. I guess my best solution would be try different jet sizes and see what works best for the airflow. Also I believe the black smoke on the exhaust could also be oil burning off the top end and have nothing to do with the jetting. Im going to investigate further tomorrow.
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Old 12 Sep 2019
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you check jetting by reading the plug, put a fresh one, do some good undisturbed miles at WOT if possible. pull it out and that will tell you you are rich or lean on the main jet. once the main is sorted, mid throttle is more needle dependent. dont touch the needles until you have the right main.

problem with XT is that the CV side of the twin carbs doesnt like running without airbox. the slide carb side is easier to sort out.
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Old 13 Sep 2019
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Awesome thanks man! I actually just took it for a spin after adjusting the mixture screw out 3 turns. It works beautifully now. Seems I just didn't have it right for the pods.
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Old 13 Sep 2019
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Im going to rebuild the top end this winter as one of the lower gaskets is leaking some oil. Any suggestions for that job that I should know about?
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Old 13 Sep 2019
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Quote:
Originally Posted by Cheapxt View Post
Im going to rebuild the top end this winter as one of the lower gaskets is leaking some oil. Any suggestions for that job that I should know about?
just general things you normally need -
Service manual;
Proper tools including torque wrench, possibly couple special tools;
New parts (gaskets, seals etc, preferably a kit), oem or good quality ones (e.g. athena);
Readiness for doing rebuild further than planned (parts/time/money) according to condition you'll find there;
Good luck!

P.S.
Quote:
the black smoke on the exhaust could also be oil burning off the top end
can't agree as far as I know burnt oil gives more bluish color to the smoke, rather than black.
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Old 14 Sep 2019
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Yes, black smoke is rich mixture, blue smoke is burning oil.
__________________
Remember that Assumption is the mother of all f**k-ups.
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Old 14 Sep 2019
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Thank you so much guys! Its my first dual sport although I have wrenched on old sportbikes and dirtbikes. Just not exactly the same as big thumper haha
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Old 17 Sep 2019
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Af 4500rpms youre still mostly using the needles. Try to raise the main needle a notch, perhaps both of them.
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