Quote:
Originally Posted by Gurr
Currently, the bike is out of the truck. I was able to start it up after that tank clean and petcock rebuilt. Unfortunately, it won't stay running. Starts and will stay running with the choke on, but once the choke is off, it just cuts out. Even after warming up. I might try just starting and running for several minutes every day to see if it blasts out whatever's going on, but something more involved may be needed.
Anyone know what the next step would be if that doesn't work? I'm worried it's double carb rebuild time. I tried to do a less involved cleaning by spraying carb cleaner into the fuel line, opening up the bowl drain plugs and blasting with some compressed air. Definitely got some crap out of there and I was just kind of hoping that would work. Any further thoughts? Does this sound like something that could be handled with a tuning or does this sound more like a bad diaphragm in the carb that has to get replaced?
Edit: I did just find this thread with a quick search. It does sound like I have to pull them off. Also, where are some common vacuum leak areas? |
There's two possibilities:
1. petcock flow - remove fuel-hose from carb-inlet and aim into measuring cup. Apply at least 10-in.Hg vacuum to petcock and measure petrol flow into cup for 30-seconds. You can suck on vacuum-hose and hold with tongue, use syringe or vacuum-tester with gauge (my preference). How much did petcock flow in that time? If we can rule-out petcock...
2. carbs - unfortunately, carb-cleaner spray nowadays has no strong cutting agents. It's just weak carrier solvents. So any dried petrol varnish won't be removed. You'll need mechanical scrubbing, ultrasonic soak and micro soda-blasting to clean out not just jets, but entire fuel-circuits inside carbs. Basically you want to scrub everywhere petrol flows from beginning to end. There's A LOT of stuff before and after jets that needs attention.
Vacuum leaks may occur in rubber manifolds between carb & head. Intake runners between carb & airbox. Every single vacuum-hose should be pressure-tested and re-installed with some kind of clamping mechanism; zip-ties or hose-clamps. Also should replace all rubber components, float-bowl seals, fuel-distribution pipe O-rings, pilot-jet adjustment-screw O-rings.
Check out
this thread for pictures of areas that needs cleaning. Also do search for "ducatiman clean carbs" for similar issues and really, really simple fix for your issue (takes no more than 10-minutes really).