Revving higher than intended can mean it's sucking in extra air somewhere:
1. yes, rubber-boot leaking between carb & head can suck in extra air.
2. throttle-cables too tight? Can you rotate throttle couple of degrees before it starts pulling on cable?
3. idle-adjuster set? Adjust to lower idle?
4. throttle-plate stop on carb? Need adjusting?
5. carbs synced? all sync ports capped off?
6. choke on or off? Verify choke-plungers are sealing all way down.
7. carb-slides stuck
8. non-stock jetting?
9. pilot-circuit mixture-screws not adjusted properly
10. throttle-shaft seals new? Using too much starter-fluid, or carb-cleaner or too much hot-tanking will destroy the seals and create vacuum-leak there.
11. clogged starter-jets will cause high idle as well.
12. clogged low-speed jets will cause high idle also, or clogged low-speed circuit feeding jets
13. jets for main and pilot circuits swapped? Can actually do that on this model.
14. leaking accelerator pump
Basically if you don't buy brand-new factory-fresh carb in OEM box, it will be used unit and will need disassembly and thorough cleaning. Given age, that's a step that should be automatic. Running bike on used carbs without full refurb can risk destroying engine due to lean mixtures and detonation.
Last futzed with by DannoXYZ; June 10th, 2019 at 03:43 AM.
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