I've searched the forum here and have not found quite this problem.
The motor starts easy and idles well. Idles OK when in gear. Runs strong and steady up to about maybe 1/3 to 1/2 throttle. Above that it starts skipping / running rough. Maintains about the same power as at part throttle...
It's a little more than an orifice question but not much.
This motor is at an Adirondack Scout camp - only gets used occasionally over two months of the year.
I came in this year to get it going and had to futz over it a while to get it to do that. Not too bad now, but it's still quirky and I...
Working on a 6R78B (1978 6HP with CD ignition)
No spark on the top cylinder. Motor starts and runs OK on bottom cylinder, but is weak as you might guess.
I switched the two HT coils and the top cylinder still does not spark. I basically got each coil to separately run the bottom cylinder...
Motor is a 50273C 1972 Lark with electric shift. I bought it used for a 16ft aluminum bowrider. I've had it out a bit - have put maybe 5-6 tanks of gas through it with no major problems until now.
I have had one minor problem - it came with the timing adjustment set so that there was almost...
Replaced the head on this motor last week (stripped spark plug thread). Pretty straightforward job - EXCEPT...
When I was torquing the far upper left bolt it just came up to 20 ft-lbs (240 in-lb) and kept on creeping. I got spooked and stopped turning after about 45 degrees of this. All the...
I have a Johnson 40 HP - late 60's or early 70's. Sorry, do not have the number just now but can get it if needed.<br /><br />The motor runs smooth and strong when first started cold - will run good for perhaps 15 to 30 minutes. Will then bog down, run a bit rough, and lose power as if I had...
