Timing Question? Help

What does .195 BTDC 341/2Degrees mean?I am trying to reset points. No fire.

Re: Timing Question? Help

BTDC = Before Top Dead Center. Top dead center is when a piston is at the exact top of its stroke. BTDC is typically specified in degrees of crankshaft rotation or as the .195 seems to indicate, .195 inches(??) before the piston reaches top dead center.

I have no idea what the 341/2 means other than 341 divided by 2 but that makes no sense when adjusting points. Since there are 360 degrees in a circle (also equal to one crankshaft revolution) I suppose a piston that is .195 inches from top dead center might also be at a point where the cranshaft has turned 341 degrees and therefore BTDC. Points are set using a feeler gauge with the rubbing block on the movable arm of the contact set sitting on the high spot of the cam lobe.

Lastly -- what in are you working on. Think that might help us a bit?

Re: Timing Question? Help

Thank You Silvertip This is a 9.8 110 merc. Serial 3612603 No spark Had spark till
i cleaned points I will buy new if necessary but I would like to set the one I have.
New are 40..00 a set!

Re: Timing Question? Help

I would like to add the 341//2 is a typo
It should be 34 and one half Thanks.