Gentlemen,
It's been a while, this little 1970 motor has been working great over the past 7 years runningup and down the Trinity river. But not it has given up on me. It's been in the garage for the past 9 months or so. Cowl on, closed up. It's always fired up after a few month sitting with no problem. On Saturday I mixed up some fresh gas and it did start but didn't run very well, wouldn't stay running, wouldn't idle, it would die when I put it into gear (running is a water barrel). Then nothing at all. I took apart the carb, it looked good(I did replace the hollow plastic float a couple years ago). I replaced the bulb and fuel lines with new (I always have a spare bulb!!). Pulled the plugs and no spark. After some more wasting time I gave up. I brought the whole thing home and tore into it yesterday. I pulled the flywheel and found light oil around the points. And the point gap was maybe .005. I cleaned that up, filed and opned up the points a bit (not sure wat the setting is, I set them about .015-.020). Put it all together and am not getting serious spark across the flat style plugs. BUT...when I open the throttle, I get no spark. the system I have is 2 points, and the 2 orange coil packs off the back. After some more pulling and no firing I noticed the plugs were dry as a bone...but I was getting some fuel overflow out of the carb. The overflow is just a few drops after I stop pulling, not a continous flow. I pulled the choke off and tried to feel for suction, nothing. Since it's hard to feel and pull I put a paper towel in front of the venturi. No suction whatsoever. Weird. The engine has good compression, I haven't put a guage on it but it'll wear you out after a short time.
I found on the web some Seloc directions on setting the timing, it has a sticker on the pull starter that says .195 BTDC 34 1/2 degrees. I'll have to figure that out.
Not sure of the point gap so if anyone has that i could use it. Why I lose spark when I turn to WOT is a mistery (it always started best at WOT).
The non sucking carb has me really scratching my head. And the good compression. If I recall a 2 cycle will pull the air/fuel mixture into the crankcase, then it gets pushed onto the top of the piston for firing. My only thought is a crack somewhere or blown gasket and the air is being sucked from somewhere else? And it did run a little bit before I got nothing.
Any help would be greatly appreciated. I use to rebuild engines for a living so I'm handy around them. But this is my first ever boat engine. Only other 2 strokes were dirt bikes when I was young.
Sorry for the long post but the more details the better.
Thanks,
Rob
It's been a while, this little 1970 motor has been working great over the past 7 years runningup and down the Trinity river. But not it has given up on me. It's been in the garage for the past 9 months or so. Cowl on, closed up. It's always fired up after a few month sitting with no problem. On Saturday I mixed up some fresh gas and it did start but didn't run very well, wouldn't stay running, wouldn't idle, it would die when I put it into gear (running is a water barrel). Then nothing at all. I took apart the carb, it looked good(I did replace the hollow plastic float a couple years ago). I replaced the bulb and fuel lines with new (I always have a spare bulb!!). Pulled the plugs and no spark. After some more wasting time I gave up. I brought the whole thing home and tore into it yesterday. I pulled the flywheel and found light oil around the points. And the point gap was maybe .005. I cleaned that up, filed and opned up the points a bit (not sure wat the setting is, I set them about .015-.020). Put it all together and am not getting serious spark across the flat style plugs. BUT...when I open the throttle, I get no spark. the system I have is 2 points, and the 2 orange coil packs off the back. After some more pulling and no firing I noticed the plugs were dry as a bone...but I was getting some fuel overflow out of the carb. The overflow is just a few drops after I stop pulling, not a continous flow. I pulled the choke off and tried to feel for suction, nothing. Since it's hard to feel and pull I put a paper towel in front of the venturi. No suction whatsoever. Weird. The engine has good compression, I haven't put a guage on it but it'll wear you out after a short time.
I found on the web some Seloc directions on setting the timing, it has a sticker on the pull starter that says .195 BTDC 34 1/2 degrees. I'll have to figure that out.
Not sure of the point gap so if anyone has that i could use it. Why I lose spark when I turn to WOT is a mistery (it always started best at WOT).
The non sucking carb has me really scratching my head. And the good compression. If I recall a 2 cycle will pull the air/fuel mixture into the crankcase, then it gets pushed onto the top of the piston for firing. My only thought is a crack somewhere or blown gasket and the air is being sucked from somewhere else? And it did run a little bit before I got nothing.
Any help would be greatly appreciated. I use to rebuild engines for a living so I'm handy around them. But this is my first ever boat engine. Only other 2 strokes were dirt bikes when I was young.
Sorry for the long post but the more details the better.
Thanks,
Rob