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Need vacuum & fuel hose routing diagram

Far1da

New member
Joined
Aug 15, 2025
Messages
2
Helping out a friend with his used Zongshen RX3 that's running like it just woke up from a nap it didn't ask for. It starts, idles for a beat, then coughs whenever we crack the throttle. Petcock is flowing and other things seem to be good including compression. The part that is driving me nuts is the hose jungle, omewhere along the line a previous owner decided zipties were a philosophy and "close enough" was a routing strategy. Now we're chasing lines that loop into nowhere, this tee that looks wonky and a vacuum port that might be capped or might be starving the petcock.
What I'm hunting for is simple: to find the vacuum and fuel hose routing diagram for this RX3 so we can put everything back the way the factory intended instead of interpreting modern art in rubber. I've got the tank off, vacuum line from the intake boot located, and two vents on the carb that I'm 90% sure should just breathe to atmosphere down by the swingarm, but I know we have to stop guessing so if anyone has the OEM diagram, a clear photo of the page from the service manual, or even a clean shot of your correctly routed setup, I'm all ears.
Thanks
 
Been there with an RX3, those hoses can turn into spaghetti real fast. The vacuum line from the intake boot should go to the petcock, and yes, the two carb vents usually just hang down to breathe. If you can get your hands on the service manual, page with the routing diagram is super helpful.
 
That sounds frustrating and honestly, chasing down a tangled mess of hoses and zip ties can easily lead to missed connections or vacuum leaks. Are you worried about accidentally damaging something while trying to trace everything?
 
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