Hi all. Hoping you can help a self confessed holly carb amateur here !!
long story short and after many many things tried so far...
Having a couple of issues remaining still after getting lots of issues sorted out already. I won’t go through everything but here goes
350 GM repower engine. One of two installed in 2012 but only had 12 hours on each when a friend bought the boat last year. It’s sat for ages unused due to previous owner taken Ill.
I can only presume it was running well after the new engines, but a few things put me off this.
So timing was off on both engines. Now set at 4o BTC. Despite me originally thinking it should be 8. Apparently these repower should be 4 ??
fuel tank empty and dried. All fresh fuel things got so much better.
fuel air set to spec and carbs cleaned but not since timing set properly though.
starboard engine now running perfectly and as it should.
port engine over fuelling. We have the back chamber a knock and the back two chokes now not flooding it with fuel as soon as we did.
Boat now planing with lots of power but starboard engine still lacking power near the top end (thinking carb again and HS Jet)
this engine also popping a little. Adjusted fuel air again a little. Popping stopped but still lacking power a little. Much lazier than starboard. As if second chokes maybe not opening.
noticed the engine running cold. New t stats on their way now. Was running as 122 degrees. Should be 165 or about that. Won’t be helping at all.
But just not being familiar with these holly carbs...anything else to look for ? It has a power valve ! Never seen that before.
open to all suggestions. Plugs all new and diz cap and leads new. New coils too.
Am I missing anything ?
Thanks.
long story short and after many many things tried so far...
Having a couple of issues remaining still after getting lots of issues sorted out already. I won’t go through everything but here goes
350 GM repower engine. One of two installed in 2012 but only had 12 hours on each when a friend bought the boat last year. It’s sat for ages unused due to previous owner taken Ill.
I can only presume it was running well after the new engines, but a few things put me off this.
So timing was off on both engines. Now set at 4o BTC. Despite me originally thinking it should be 8. Apparently these repower should be 4 ??
fuel tank empty and dried. All fresh fuel things got so much better.
fuel air set to spec and carbs cleaned but not since timing set properly though.
starboard engine now running perfectly and as it should.
port engine over fuelling. We have the back chamber a knock and the back two chokes now not flooding it with fuel as soon as we did.
Boat now planing with lots of power but starboard engine still lacking power near the top end (thinking carb again and HS Jet)
this engine also popping a little. Adjusted fuel air again a little. Popping stopped but still lacking power a little. Much lazier than starboard. As if second chokes maybe not opening.
noticed the engine running cold. New t stats on their way now. Was running as 122 degrees. Should be 165 or about that. Won’t be helping at all.
But just not being familiar with these holly carbs...anything else to look for ? It has a power valve ! Never seen that before.
open to all suggestions. Plugs all new and diz cap and leads new. New coils too.
Am I missing anything ?
Thanks.
