Well, an update.
I installed a new genuine Crank angle sensor, and while it seems slightly smoother, it hasn't fixed my issue @99fzj105.
It seems to be smoother, and a little less likely to falter or hesitate, but it still nearly stalls, or backfires, with any real application of the accelerator.
It is running a tad better though, and its one thing to tick of from the list of possibles.
Gee, that photo you provided must have been of an engine that had been steam cleaned and sand-blasted!
I discovered mine has a leaking sump gasket, from the look of it, lots of oil over everything down low, especially on the RH side, near the crank angle sensor connector.
Another thing to fix, and as its due for a oil change might as well do that as well then.
I pulled all the plugs and inspected - they were all NGK BKR5EKB-11, which seem suitable.
They all seemed OK, not very worn, no fouled or blackened plugs.
I've ordered a cheap fuel pressure gauge which should turn up next week, so I'll check that.
If that's fine, I'll replace the fuel filter, and open up the old one to see if there's any rust or other crap in the tank.
Mine does seem to get worse the lower the tank is.
As its dual petrol and gas, I assume the sub tank has been removed, so I cannot test petrol performance on that tank.
The PO said it never worked for her on gas, and I haven't tried it, other than to see it die if I switch to gas - I decided to focus on getting it running OK on petrol well first...
Only other thing I noticed is that in the LH front sidewall, near the other relays and that, there is an aftermarket device to do with the dual fuel setup.
It has a dial/ potentiometer to adjust with a screwdriver, and has the words gas and petrol printed on either side.
Not sure what it does, or if it could affect the performance on petrol.
Anyway, I'll keep at it.
I installed a new genuine Crank angle sensor, and while it seems slightly smoother, it hasn't fixed my issue @99fzj105.
It seems to be smoother, and a little less likely to falter or hesitate, but it still nearly stalls, or backfires, with any real application of the accelerator.
It is running a tad better though, and its one thing to tick of from the list of possibles.
Gee, that photo you provided must have been of an engine that had been steam cleaned and sand-blasted!
I discovered mine has a leaking sump gasket, from the look of it, lots of oil over everything down low, especially on the RH side, near the crank angle sensor connector.
Another thing to fix, and as its due for a oil change might as well do that as well then.
I pulled all the plugs and inspected - they were all NGK BKR5EKB-11, which seem suitable.
They all seemed OK, not very worn, no fouled or blackened plugs.
I've ordered a cheap fuel pressure gauge which should turn up next week, so I'll check that.
If that's fine, I'll replace the fuel filter, and open up the old one to see if there's any rust or other crap in the tank.
Mine does seem to get worse the lower the tank is.
As its dual petrol and gas, I assume the sub tank has been removed, so I cannot test petrol performance on that tank.
The PO said it never worked for her on gas, and I haven't tried it, other than to see it die if I switch to gas - I decided to focus on getting it running OK on petrol well first...
Only other thing I noticed is that in the LH front sidewall, near the other relays and that, there is an aftermarket device to do with the dual fuel setup.
It has a dial/ potentiometer to adjust with a screwdriver, and has the words gas and petrol printed on either side.
Not sure what it does, or if it could affect the performance on petrol.
Anyway, I'll keep at it.