[DannoXYZ]

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.