motiondave
Recruit
- Joined
- Oct 4, 2020
- Messages
- 5
Hi there people. I have a 2008, 30hp 2 stroke that bogs under load.
we have , as follows.
compression is perfect on both cylinders, 150 psi.
Its been to two mechanics and came back with two different answers. one said replace several ignition parts and coils under and above the flywheel, supposedly faulty, did that, no success
another said replace fuel pump, carby, fuel lines, clean everything, no sucess
We have replaced..
CDI, exicter coil, (charge coil shows right voltage) , coil for spark, recitfier. new plugs (tried different gaps)
spark overall seems good according to spark tester. no fouled plugs, they are the right colour
It was suggested we run a DVA meter, but as said, both coils under flywheel are either replaced or checked to be good.
new carby, new fuel pump, all new fuel lines,
new tank, new fittings.
Still bogs, like too much fuel, gets to 10 knots and bogs, but does not stall. (which is weird as I tried BRAND NEW carby) , we did try, with boat on trailer, running it in gear and spraying fuel into carby and it bogged more, so not lack of fuel.
reed plate has been inspected and checked to be ok.
prop is standard 9.9 x 11 , and we are only pushing a 9 foot boat with it.
fuel, weve tried 60:1 mix instead of 50:1, unless its supposed to be something different (70?100:1?)
we are trying, as time allows, changing the jet sizes to see if we get results.
Is there anything, apart from a full tear down of the power head , its been suggested gasket leaks between crank cases(would rather not go to that) , have we missed anything to test or check?
Kindest Regards, David Lane.
we have , as follows.
compression is perfect on both cylinders, 150 psi.
Its been to two mechanics and came back with two different answers. one said replace several ignition parts and coils under and above the flywheel, supposedly faulty, did that, no success
another said replace fuel pump, carby, fuel lines, clean everything, no sucess
We have replaced..
CDI, exicter coil, (charge coil shows right voltage) , coil for spark, recitfier. new plugs (tried different gaps)
spark overall seems good according to spark tester. no fouled plugs, they are the right colour
It was suggested we run a DVA meter, but as said, both coils under flywheel are either replaced or checked to be good.
new carby, new fuel pump, all new fuel lines,
new tank, new fittings.
Still bogs, like too much fuel, gets to 10 knots and bogs, but does not stall. (which is weird as I tried BRAND NEW carby) , we did try, with boat on trailer, running it in gear and spraying fuel into carby and it bogged more, so not lack of fuel.
reed plate has been inspected and checked to be ok.
prop is standard 9.9 x 11 , and we are only pushing a 9 foot boat with it.
fuel, weve tried 60:1 mix instead of 50:1, unless its supposed to be something different (70?100:1?)
we are trying, as time allows, changing the jet sizes to see if we get results.
Is there anything, apart from a full tear down of the power head , its been suggested gasket leaks between crank cases(would rather not go to that) , have we missed anything to test or check?
Kindest Regards, David Lane.
