O.K. here it is.
1996 Mariner 115 that stalls/stumbles when in the holeshot from idle to 2100 rpm's when the #3 and #4 carbs kick in and it then it runs awesome.
It stalls and stumbles all over itself. Idle seems a bit rough and uneven. I'm mechanical. This one has me and the boat mechanic(2 of them) stumped. It's like the #1 and #2 carb are not doing their job properly. The boat runs great after all four carbs are kicked in.
Recent work.
new regulator
new impeller
prop pulled and hub checked
carbs cleaned
link and sync
throttle cable adjusted for WOT
this is when the problem started
now everything to fix problem
fuel sample taken = good
carbs re-built with new gaskets and needles
floats checked for proper measurement
new link and sync including dyno
oil pump adjusted(was a bit rich)
fuel accelerator new and gap checked
fuel pump rebuilt
compression good and even
1/2" spark
new plugs NGK and gapped .0400
new fuel filters
thermastat replaced(running kinda cool, but continues to do so w/ new part)
the carbs don't seem to hold adjustments very well. Each time the motor is turned off the carbs seem to need new adjustments after motor cools. Minor adjustments not major.
It's not really a holeshot problem, so please don't blame it on the prop. It's from idle to 2100prm's which just happens to include the holeshot. It's any acceleration up to 2100rpms.
Boat info: 1996 Champion 171 with Mariner 115. Great holeshot before. Trophy 24P stainless prop. Runs 48mph @ 5000 rpm's at 17-19 water psi. 5 or 5.5 inches below pad. (I think it needs to be 3.5 inches) Will address this after this problem here gets fixed. Motor has been in great shape since new. Very clean and maintained.
There may be more just can't remember right now. Any ideas? Thanks
1996 Mariner 115 that stalls/stumbles when in the holeshot from idle to 2100 rpm's when the #3 and #4 carbs kick in and it then it runs awesome.
It stalls and stumbles all over itself. Idle seems a bit rough and uneven. I'm mechanical. This one has me and the boat mechanic(2 of them) stumped. It's like the #1 and #2 carb are not doing their job properly. The boat runs great after all four carbs are kicked in.
Recent work.
new regulator
new impeller
prop pulled and hub checked
carbs cleaned
link and sync
throttle cable adjusted for WOT
this is when the problem started
now everything to fix problem
fuel sample taken = good
carbs re-built with new gaskets and needles
floats checked for proper measurement
new link and sync including dyno
oil pump adjusted(was a bit rich)
fuel accelerator new and gap checked
fuel pump rebuilt
compression good and even
1/2" spark
new plugs NGK and gapped .0400
new fuel filters
thermastat replaced(running kinda cool, but continues to do so w/ new part)
the carbs don't seem to hold adjustments very well. Each time the motor is turned off the carbs seem to need new adjustments after motor cools. Minor adjustments not major.
It's not really a holeshot problem, so please don't blame it on the prop. It's from idle to 2100prm's which just happens to include the holeshot. It's any acceleration up to 2100rpms.
Boat info: 1996 Champion 171 with Mariner 115. Great holeshot before. Trophy 24P stainless prop. Runs 48mph @ 5000 rpm's at 17-19 water psi. 5 or 5.5 inches below pad. (I think it needs to be 3.5 inches) Will address this after this problem here gets fixed. Motor has been in great shape since new. Very clean and maintained.
There may be more just can't remember right now. Any ideas? Thanks