Hey kids, thought I would create a new post to differentiate from my most recent one on Solex jetting and my issue with poor bottom end performance.Zspryte got me thinking about timing and I had to dig back to earlier posts I'd made to refresh my memory...being old you know!
Back in January of '24, my first actual drive and plowing action at home, plowing my driveway. It ran fine, none of the bogging down off idle when feeding throttle.
Then around mid March '24 I started tuning the basics and noticed the timing was at 20°BTDC (spec is for 6°BTDC, vacuum hose disconnected at idle), so of course I reset timing to spec and adjusted idle sped and mix screw accordingly. Idled fine sitting in the driveway but I never took it for a spin down the road. It did have a substantial bog/cough if I punched the throttle too hard, which was not an issue during my earlier snow plowing a couple months prior and before I retarded the timing.
All this past winter I had to keep the rpms up in granny gears or she would bog down. I just lived with it....but it's not right!
Blah blah blah. Why was there so much (20°) timing initially from the previous owner? My vacuum advance canister seems functional....if I manually put vacuum to it, the timing advances. So the 20° I had with hose disconnected was all baseline at the distributor and theoretically would advance even more when on throttle and pulling vacuum from the carburetor port.
Next trip up to the cabin I'll be adding some advance to see what that does...not as much as 20° but more than the 6° I'm currently at. And I'll check the actual vacuum at the carb port.
More to come...comments always welcome.
Back in January of '24, my first actual drive and plowing action at home, plowing my driveway. It ran fine, none of the bogging down off idle when feeding throttle.
Then around mid March '24 I started tuning the basics and noticed the timing was at 20°BTDC (spec is for 6°BTDC, vacuum hose disconnected at idle), so of course I reset timing to spec and adjusted idle sped and mix screw accordingly. Idled fine sitting in the driveway but I never took it for a spin down the road. It did have a substantial bog/cough if I punched the throttle too hard, which was not an issue during my earlier snow plowing a couple months prior and before I retarded the timing.
All this past winter I had to keep the rpms up in granny gears or she would bog down. I just lived with it....but it's not right!
Blah blah blah. Why was there so much (20°) timing initially from the previous owner? My vacuum advance canister seems functional....if I manually put vacuum to it, the timing advances. So the 20° I had with hose disconnected was all baseline at the distributor and theoretically would advance even more when on throttle and pulling vacuum from the carburetor port.
Next trip up to the cabin I'll be adding some advance to see what that does...not as much as 20° but more than the 6° I'm currently at. And I'll check the actual vacuum at the carb port.
More to come...comments always welcome.
