honda cl77 305 scrambler ignition timing problem

Tony1257 · Post by **Tony1257** » Thu Oct 04, 2012 11:16 pm

I recently purchased a non running 1966 Honda cl77. It was supposedly rebuilt but had been sitting for some time. It has good compression 150lbs. It will fire on first or second kick but will not run for long or idle. When I checked the static timing i cannot rotate the timing plate counterclockwise enough to line up with the LF or F mark on the stator. Does this mean that the timing sprocket may be off a tooth or two? I am hoping there is a simple fix, but fear that I will need to pull the engine and look at the top end. Any suggestions or advice would be appreciated. Thanks, Tony

FluteTears · Post by **FluteTears** » Fri Oct 05, 2012 4:01 am

I am not sure that timing is your problem if it starts and then cut out could it be more of a gas problem? A bad timed engine that starts can run just not as good but it will run.
Check your carb if it's been sitting that would be the first place I would look. Providing it ran before siting in the barn.

Tango911 · Post by **Tango911** » Fri Oct 05, 2012 8:21 am

agree with the above reply. if it starts and runs well for a short time , the timing is not far off. Your carb needs cleaned.

Tony1257 · Post by **Tony1257** » Fri Oct 05, 2012 9:08 am

Thanks for the suggestions, but this does not explain why the timing marks "LF" and "F" are so far off from the pointer. The carbs have been cleaned and it does not run very well at all. It is sporadic at best. Thanks for the input. Tony

davomoto · Post by **davomoto** » Fri Oct 05, 2012 9:37 am

With the rotor on F, the line on the points cam should be at 12 o clock. If it is at 11, or 1 o clock, the cam timing is off and you'll ahve to remove the engine. take a pic and post it if you can.

Davo

jleewebb · Post by **jleewebb** » Fri Oct 05, 2012 10:38 am

try this: adjust the points plate to center of its range first, then set right point gap and proceed per Ed's tuning recipe here: http://www.honda305.com/cb77_700/cb77-716.htm

I think that's how I handled the problem, been a while, good luck... --Lee

Tony1257 · Post by **Tony1257** » Fri Oct 05, 2012 6:42 pm

Davo and Lee, Thanks for the suggestions. With rotor on F the line on the cam lines up at 9:00 or 3:00. With the rotor on LF the line on the cam lines up at 12:00 or 6:00. I suspect that something must be off in the alignment of the cam sprocket. I am surprised that it fires at all and that the piston is not hitting the valves. I was hoping against hope that I would not have to pull the engine. Thanks, Tony

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honda cl77 305 scrambler ignition timing problem

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