Stumbles above 70 mph

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dave9543
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Joined: Sun Sep 30, 2012 5:09 am

Stumbles above 70 mph

Postby dave9543 » Sun Sep 30, 2012 2:31 pm

Purchased cb650cs 2 weeks ago. Runs, idles, rides great except above 70 mph. Bike is completely stock. Above 70 mph bike starts to lose power until switched to reserve then runs great. This my first 650 . Any ideas why this is gas starved?
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cb650
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Re: Stumbles above 70 mph

Postby cb650 » Sun Sep 30, 2012 6:31 pm

Sounds like the petcock is plugged. Be a good time to clean the tank too.
Did you clean the tank out?!?!?!?!
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dave9543
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Joined: Sun Sep 30, 2012 5:09 am

Re: Stumbles above 70 mph

Postby dave9543 » Sun Sep 30, 2012 7:50 pm

Tank is as clean as new. Would I be better rebuilding the petcock?
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cb650
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Re: Stumbles above 70 mph

Postby cb650 » Mon Oct 01, 2012 9:15 am

If they where rebuild-able yes. None of the internals are offered if you need them. See what flow you get out of it.
Did you clean the tank out?!?!?!?!
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Volker_P
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Re: Stumbles above 70 mph

Postby Volker_P » Thu Oct 04, 2012 2:23 am

Welcome here! :D

Try without the tank cap. Possibly the vent is plugged.
Petcock filter screen (inside the tank) is clean, too?
Kinked fuel line?
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum
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