Quote:
Originally Posted by bosozoku
Thanks for the input! We’ll keep looking for vacuum leaks.
Yeah the other set of carbs may have the same or similar issue from sitting. We didn’t remove the pilot screws on the one carb. And the other one, which we did remove the screws from, seems to have been factory set at 1-5/8 rather than 2.5 – but we tried both settings – should be set around 2.5 turns out currently. The slides rise and fall smoothly and evenly. Pretty sure they sit down all the way but that’s something we can double check. Needle jets are in place. We didn’t bench sync the carbs – we left the carb sync as it was. Regarding the idle mixture passages, we shot carb cleaner down the pilot jet tube and confirmed it would come out in the venturi. Are there additional mixture passages to focus attention on? We didn’t remove the o-rings, but that is something we could look at. Is it just the o-ring in the pilot screw hole you are referring to? Or are there other o-rings to look at?
Just took the cover off the enricher, didn't see anything of interest there. Air cut off valve diaphragm looks fine. Were you referring to the actual choke - that we might want to look at that?
Thanks for the heads up on the petcock – I could see how that might be a pain.
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This section has a lot of info that may be helpful -
https://faq.ninja250.org/wiki/Intake
After removing the idle mixture screws, and confirming the o-rings are good and in place, you need to check that the passages are open. The o-rings sit on the screws, above the spring and washer (o-rings closest to the carb).
2.5 turns out on the idle mixture screws is a good place to start. Original adjustments vary, but are always on the lean (in) side.
Bench syncing the carbs is just a good starting point. Checking with a vacuum gauge later, when it's running well, should show it to be very close. If it's not there may be other issues (valve adjustment, vacuum leak, etc).