1996 6hp runs on with 3/4 choke

[Sherman]

I have replaced the following and it will only run or start with the choke out 3/4 and it runs poorly even then and often dies. This is a kicker motor and runs on the same gas supply through a filter seperator and the big motor runs great. With much help from you guys.<br />Compression is 90 89<br />I pulled the exhaust cover and the ring and pistons look great.<br />New carb kit and cleaned three times <br />New fuel pump kit checked flow at output ok<br />New hoses and hose fittings<br />Did link and sync<br />I installed a new head gasket<br />I installed a new thermostat<br />New spark plugs NGK BP5HS which is what it came with when it was new.<br />Pumping the primer bulb does not help<br /><br />I have the factory manual but no ideas.<br />I am down to the wire on this as I am leaving on a fishing trip in a week and have to have this working.<br /><br />Any ideas would be very helpful THANKS.<br />Sherm

 

[phatmanmike]

Re: 1996 6hp runs on with 3/4 choke

you have an air leak. its running too lean, hence it will only run with the engine choked.<br /><br />check all your gaskets and seals around the carb. check reeds valves too.

 

[Sherman]

Re: 1996 6hp runs on with 3/4 choke

I found what I thought was the problem. One of the carb studs was not down far enough. I think the nut was bottoming out on the uncut portion of the stud which made the gasket not seal. <br /><br />Now I can get it to idle fair but when I give it any throttle it dies. This is with the idle adj. screw out three full turns as per the book. If I change this even the slightest it starts to pop and run poorly.<br /><br />Maybe I should be looking at ignition or something else I am really lost on this one.<br /><br />Thanks

 

[phatmanmike]

Re: 1996 6hp runs on with 3/4 choke

are you running this under a load( on a bot in the water) or just on the muffs at home( out of the water)

 

[Sherman]

Re: 1996 6hp runs on with 3/4 choke

Right now I am running it on muffs but last week I was running it in a trash can. This morning I think I will pull the flywheel and just take a look. I also think I should figure out wheather it's firing at the right time. I did do the spark test and it jumps 1/2 inch with no problem.<br />Thanks so much for the help.<br />Sherm

 

[phatmanmike]

Re: 1996 6hp runs on with 3/4 choke

if your 96 is anything like my 89, you cant do anything to the spark timing excepte mix up the plug wires.<br /><br />with the way its "bogging" when you give it throttle, it sounds like it is too rich.<br /><br />turn your mixture screws back in again, and slowly, turn outwards 1/4 turn ata time untill its starts to sound good.

 

[Sherman]

Re: 1996 6hp runs on with 3/4 choke

I just spent another hour turning the idle screw in and out slowly but if it will idle as soon as I give it throttle it dies. If I adjust the screw to where it will run at high rpms then when I back the throttle off it dies. Perplexed, confussed and dumbfounded.<br /><br />I did pull the flywheel just to take a look to make sure I didn't have a sheared key or the like but it looks perfect.<br /><br />Thinking of ordering another carb kit and starting over as I have gone down this road too far already. Or pulling the reed plate although I can see them fair through the carb hole.<br /><br />Sherm