Thread: Top End Rebuild
View Single Post
Old 09-17-2008, 01:04 AM   #5
No Worries
Keyboard Racer
 
No Worries's Avatar
 
Join Date: Feb 2008
Location: Mile High City
Moto: Old Superbikes
Posts: 1,016
Default

Quote:
Originally Posted by BobTheBiker View Post
good start. the CCT killed it the first time didnt it? or was it the burnt valves?
Older CBR's had a problem with CCT's. On the 600's, the CCT is on the outside of the engine and can be easily changed to a manual adjuster. The older 1000's, like mine, have the CCT under the cams.

Quote:
Originally Posted by Dave View Post
dead valves make me think of fueling issues. check your carbs and spark lately?
With most of my riding above 6,000 feet, lean conditions are rare. Exhaust valves usually burn when the valve can't transfer heat to the seat. Usually caused by a too tight clearance, if just one valve is burned, with the valve being held off the seat. If all the exhaust valves are burnt, the chain skipped a tooth and/or the CCT ain't working.

Quote:
Originally Posted by BobTheBiker View Post
Come to think of it, I believe he mentioned somewhere awhile back that the ignition gave him some kind of troubles, so spark is probably a culprit.
All bikes will have electrical problems sooner or later. When I couldn't beat the new liter bikes anymore, I cleaned the carbs. When the condition continued, I checked the ignition advance. Since I'm the only person on Earth who has and still uses a timing light, I saw that the ignition timing stayed at TDC while revving the engine. The pulse generator went bad. I bet it's a common problem. The bike starts and runs, but has no snap and the mileage goes down.
No Worries is offline   Reply With Quote