jgriner
Petty Officer 2nd Class
- Joined
- Jul 22, 2010
- Messages
- 146
ive got a johnson stinger that when i got wot, it surges, misfires, and will not reach top speed.
sunday when i took it out its top speed going out on the lake was right at 16 mph according to my phone gps. comeing back in its top speed was 19 mph, it would pause at 16 for a while then surge to 19 and hold it.
wednesday its top speed going out again was 16 but come back in was only 14 at times it would surge down to only 11mph
I would think that this 20ft pontoon boat should get about 30 mpg on a 75hp
details details details from day one.
i got this boat 3 weeks ago, the old man who had it before me could not get it running right so he missed with stuff. he had the timming way off and the the idle turned way up.
we bought a generic book on the net, it said to set the timming to 18? - 20?
I also put new spark plugs in the boat.
Checked the compression 147-150 psi on all 3 cylinders
I took it to the lake it would only go about 1/4 trottle and it would bog down and it not gain any more speed.
took it home and checked the carbs the high speed jets were clogged, I pushed it out with air. took it back to the lake and she ran good, top speed, probably about 30 mph
took it to the lake the next weekend and at about 3/4 throttle she starts missfireing ,and surging again
ive taken the carbs off 3 more times now and all jets are open and clear, replaced many hoses, ive replaced the tanks, main fuel line and pump, cleaned the fuel pump screen.
ive talked to a local tech and he said shoot starter fluid in the carbs if it bogs down then the carb is getting plenty of fuel, if it takes off then its not getting enought.
when we did that test the 1st carb would bog the engine a little bit. 2nd carb killed the engine every time. and the 3 carb would bog it down quit a bit.
one more tab bit of info.
on wednesday when i took it out, it started at the ramp and ran good to the rock quarry, i turned it off and went swimming, after bout an hour got back in and tried to leave, it would not start the battery would turn the motor over but not fast enough(the battery had always struggled to turn over the motor), i had someone jump me, thats when going back was only 14mph
yesterday i bought the biggest battery wallmart had, I also put new spark plugs in it and tested it at the river on the trailer still same problems.
thanks guys for all the help
sunday when i took it out its top speed going out on the lake was right at 16 mph according to my phone gps. comeing back in its top speed was 19 mph, it would pause at 16 for a while then surge to 19 and hold it.
wednesday its top speed going out again was 16 but come back in was only 14 at times it would surge down to only 11mph
I would think that this 20ft pontoon boat should get about 30 mpg on a 75hp
details details details from day one.
i got this boat 3 weeks ago, the old man who had it before me could not get it running right so he missed with stuff. he had the timming way off and the the idle turned way up.
we bought a generic book on the net, it said to set the timming to 18? - 20?
I also put new spark plugs in the boat.
Checked the compression 147-150 psi on all 3 cylinders
I took it to the lake it would only go about 1/4 trottle and it would bog down and it not gain any more speed.
took it home and checked the carbs the high speed jets were clogged, I pushed it out with air. took it back to the lake and she ran good, top speed, probably about 30 mph
took it to the lake the next weekend and at about 3/4 throttle she starts missfireing ,and surging again
ive taken the carbs off 3 more times now and all jets are open and clear, replaced many hoses, ive replaced the tanks, main fuel line and pump, cleaned the fuel pump screen.
ive talked to a local tech and he said shoot starter fluid in the carbs if it bogs down then the carb is getting plenty of fuel, if it takes off then its not getting enought.
when we did that test the 1st carb would bog the engine a little bit. 2nd carb killed the engine every time. and the 3 carb would bog it down quit a bit.
one more tab bit of info.
on wednesday when i took it out, it started at the ramp and ran good to the rock quarry, i turned it off and went swimming, after bout an hour got back in and tried to leave, it would not start the battery would turn the motor over but not fast enough(the battery had always struggled to turn over the motor), i had someone jump me, thats when going back was only 14mph
yesterday i bought the biggest battery wallmart had, I also put new spark plugs in it and tested it at the river on the trailer still same problems.
thanks guys for all the help
