Specifics:<br /><br />1) 83 Wellcraft CC (20" inch transom)<br />2) 78 Evinrude 175 (25" shaft) <br />3) Jack Plate (7 in set back, motor mounted in bottom hole).<br /><br />I have bought the items seperately and began some initial testing before going all out. This motor sat for 6 months and has an unknown service history, but looks cared for. Before it was mounted to the boat it ran on muffs (1 hour) and all was OK. Mounted the motor and ran at the ramp in gear (varied throttle) and was OK. Put the boat in the water 2 times and have an issue with bogging down at speed or moving from low speed. <br /><br />Symptoms:<br /><br />Boggs down at high speed or moving to high speed after motor warms up. It behaves like it is going to plane out then just stays in the bow up position and the motor just chugs and bogs but stays running (no tach at this time). I can put the motor in nuetral and it runs and rev's great and does NOT die. Put it back in gear and it bogs down when giving it throttle. I tried to choke it while it is bogging and the condition gets worse. The bulb is hard all the time. I'm not sure if it is a warming issue either or just that it is running for 5 - 10 minutes. The last time it was out I was running around 30mph for the first 3 mile run, I circled around at speed and the bogging started again. Kinda like something moved (crud maybe) and began blocking fuel. I Let the motor idle for 10 minutes or so while checking on a few things and then took off fine for a mile or so then began bogging again. During this last run I went thru 3 gallons of gas in the first 3 mile run at 30mph, which seems excessive. I would say it drank quite a bit of fuel in the driveway and at the ramp also. Just didn't keep track (darn)!<br /><br />Items to Consider:<br /><br />1) Fresh Gas in temp test tank (50:1 Synthetic)<br />2) Fuel Pump Filters cleaned<br />3) Bulb is hard at all times (new 6' long 3/8's id)<br />4) New Plugs J4C's at .030<br />5) Carbs NOT rebuilt (next step)<br />6) Motor telltale fine, water pressure at 10-15 psi, can hold my hand on the heads for a long time.<br />7) Old in line fileter (will be replaced)<br />8) New port side power pack.<br /><br />The issue seems to be fuel related but wanted thoughts on timing or anything else. From the timing perspective I wonder if the throttle return spring could be weak. Anyone dealt with the spring before? Could it be a temperature issue? Maybe the deflector tubes need replacing. Also, I have not checked thermostats yet either. Seems odd that I can hold my hand on the heads almost indefinetly (warm but not realy hot).<br /><br />Plans include rebuild carbs, new mainfold gasket, inspect reeds, replace fuel pump vacum hoses (the others are all new) and a new inline clear filter. I'm also rechecking all electrical connections and grounds. <br /><br />I don't want to just jump in start replacing alot of items with out knowing the cause. Your help and suggestions are most welcome and appreciated.
