All,
I am once again calling upon your collective expertise as I am at my wit's end with this motor. I purchased the YAMAHA rebuild kits for my carbs and went through both of them.. While there was some shellac in the floarts and on the jets, nothing was REAL bad like I have seen on some carbs before. However, I still soaked all the brass parts and blew out all the ports with compressed air. I set the float drop on each float according to the chart in the SELOC manual (15.5 - 16.5mm) and put it all back together with new gaskets.
I ALSO purchased a brand new fuel pump just to be on the safe side and installed it as well.
I backed the boat into the water expecting a triumphant start and clean idle and NOTHING... The motor turned over, but would not start. I had to use starting fluid to FINALLY get it to catch (it is oil injected so no worries there). It started, but only after being choked and the throttle being set to 3/4 full. Then it would NOT idle below about 1400 RPM.. Anything below this and the motor just dies.
I bumped the idle up on the carb to 1200 and let it sit for a while idling. I then backed it off the trailer and motored out of the marina and into open water. Above 2000 RPM, the motor ran smoooooth as 20 year old scotch, but anything under that and it stumbles and threatens to die.
I get back to the marina and line up to load on my trailer and the darn thing died and REFUSED to restart, in spite of the fact that I was choking it and setting the throttle in various positions. It took another shot of starting fluid to get it to start and of course it still would not idle. I put it up on the trailer and parked it and this is where I sit now.
I set all 4 idle mixture screws (per the SELOC manual) to 1-1/2 turns from lightly seated.
The low speed idle jets were cleaned well and shiny when I put them back in.
What should I try next? What could be causing it not to idle?
The primer bulb firms up, but after running for a while does not stay firm, but is not deflated either. This is on new gas and everything.
Does anyone have any ideas? I would sure appreciate the help because at this point I am at a loss.
By the way, the motor won't rev any higher than 4200 while underway. This is on a 25ft pontoon boat that is very heavy so this may be the cause of the lack of top end but I am not sure if this is related.
I am once again calling upon your collective expertise as I am at my wit's end with this motor. I purchased the YAMAHA rebuild kits for my carbs and went through both of them.. While there was some shellac in the floarts and on the jets, nothing was REAL bad like I have seen on some carbs before. However, I still soaked all the brass parts and blew out all the ports with compressed air. I set the float drop on each float according to the chart in the SELOC manual (15.5 - 16.5mm) and put it all back together with new gaskets.
I ALSO purchased a brand new fuel pump just to be on the safe side and installed it as well.
I backed the boat into the water expecting a triumphant start and clean idle and NOTHING... The motor turned over, but would not start. I had to use starting fluid to FINALLY get it to catch (it is oil injected so no worries there). It started, but only after being choked and the throttle being set to 3/4 full. Then it would NOT idle below about 1400 RPM.. Anything below this and the motor just dies.
I bumped the idle up on the carb to 1200 and let it sit for a while idling. I then backed it off the trailer and motored out of the marina and into open water. Above 2000 RPM, the motor ran smoooooth as 20 year old scotch, but anything under that and it stumbles and threatens to die.
I get back to the marina and line up to load on my trailer and the darn thing died and REFUSED to restart, in spite of the fact that I was choking it and setting the throttle in various positions. It took another shot of starting fluid to get it to start and of course it still would not idle. I put it up on the trailer and parked it and this is where I sit now.
I set all 4 idle mixture screws (per the SELOC manual) to 1-1/2 turns from lightly seated.
The low speed idle jets were cleaned well and shiny when I put them back in.
What should I try next? What could be causing it not to idle?
The primer bulb firms up, but after running for a while does not stay firm, but is not deflated either. This is on new gas and everything.
Does anyone have any ideas? I would sure appreciate the help because at this point I am at a loss.
By the way, the motor won't rev any higher than 4200 while underway. This is on a 25ft pontoon boat that is very heavy so this may be the cause of the lack of top end but I am not sure if this is related.
Comment