Been chasing a ghost for over a year now, still no success.
Symptoms:
- Coolant temp gauge reading very hot after only a few minutes of running, but no other signs of overheating
- After crawling along in low range a short while or flogging it up hills in high range, the engine misfires badly. It will stall if I push the throttle hard, but it'll still idle roughly. Adjusting the mixture (to make it more rich) seemed to make it slightly more tolerant
Parts replaced:
- engine oil
- thermostat
- fan clutch
- water pump
- belts
- hoses
- expansion tank cap
- radiator
- temp sender
- temp gauge
- fuel filter
- air filter
Tinkering thus far:
- rad & cooling jacket flush, forward & reverse
- attempted to rule out air lock; ran without rad cap while on incline to bleed
- attempted to rule out HGF; no bubbles/residue visible
- adjust ignition timing
- balance carbs
I'm not really convinced it's overheating. IR thermometer says the top hose is 82-85C with an 88C thermostat. Bottom hose reads about 75C. All seems spot-on, even tho the gauge reads past the red.
Last week I discovered the timing marks on the craft shaft pulley are off, so finding TDC and getting the timing just right is still a problem.
It's idling too fast. Just fitted a rev counter and it's idling at 1000-1500RPM; the timing is over-advanced (also getting pinging under load), so I'll retard the timing slightly and that should help.
Any ideas greatly appreciated!
Symptoms:
- Coolant temp gauge reading very hot after only a few minutes of running, but no other signs of overheating
- After crawling along in low range a short while or flogging it up hills in high range, the engine misfires badly. It will stall if I push the throttle hard, but it'll still idle roughly. Adjusting the mixture (to make it more rich) seemed to make it slightly more tolerant
Parts replaced:
- engine oil
- thermostat
- fan clutch
- water pump
- belts
- hoses
- expansion tank cap
- radiator
- temp sender
- temp gauge
- fuel filter
- air filter
Tinkering thus far:
- rad & cooling jacket flush, forward & reverse
- attempted to rule out air lock; ran without rad cap while on incline to bleed
- attempted to rule out HGF; no bubbles/residue visible
- adjust ignition timing
- balance carbs
I'm not really convinced it's overheating. IR thermometer says the top hose is 82-85C with an 88C thermostat. Bottom hose reads about 75C. All seems spot-on, even tho the gauge reads past the red.
Last week I discovered the timing marks on the craft shaft pulley are off, so finding TDC and getting the timing just right is still a problem.
It's idling too fast. Just fitted a rev counter and it's idling at 1000-1500RPM; the timing is over-advanced (also getting pinging under load), so I'll retard the timing slightly and that should help.
Any ideas greatly appreciated!