engine will not plane boat w/o choking

[dgreene]

I have an 83 evinrude 35hp that I cant get to rev to high rpms without choking. I have rebuilt the carb and then had it apart again to make sure it was cleaned well. I then rebuilt the fuel pump, and I have replaced the primer bulb and line. still same problem, I have to choke the dang thing to get it to plane, and leave it choked or I lose rpms fairly quickly.<br /><br /> I have also done a comppression check and it reads fine 105&110

 

[DJ]

Re: engine will not plane boat w/o choking

You still have a fuel restriction. Is your tank vented?

 

[Barnacle_Bill]

Re: engine will not plane boat w/o choking

Check you fuel tank vent to be sure its clear and all hoses for cracks. Especially close to clamps.

 

[dgreene]

Re: engine will not plane boat w/o choking

I have an old metal tank how do i check the vent?<br /> I have taken the pick up off the tank to make sure it is not clogged. the screen on it is clear

 

[DJ]

Re: engine will not plane boat w/o choking

If you have a restriction, on the tank side of the pump, the primer bulb will usually go flat.<br /><br />You are running lean. When you removed the carb, did you replace the gasket behind it?

 

[dgreene]

Re: engine will not plane boat w/o choking

yes it was part of the rebuild kit<br /><br /> not sure if this matters but it will rev fine in nuetrel.

 

[ob]

Re: engine will not plane boat w/o choking

Revving in neutral does not require the same fuel volume demand as revving in gear(under load).

 

[DJ]

Re: engine will not plane boat w/o choking

OK. Did you replace the float?

 

[dgreene]

Re: engine will not plane boat w/o choking

I'm not so sure about that, cant remember if it came with the kit. I'm thinking not

 

[OBJ]

Re: engine will not plane boat w/o choking

Are you sure the throttle plate is coming all the way open when you go to WOT?<br /><br />With the engine not running, put it in gear and push the throttle or tiller hand twist grip to WOT. Take a look at the throttle plate. It should be horizontal or flat in the carb throat. If it isn't...that is your problem.

 

[dgreene]

Re: engine will not plane boat w/o choking

that was a good idea! one i hadn't thought of but, unfortunately thats not the issue, I just checked it this morning hoping that it was that simple<br /> could it be that the air/fuel mixture is incorrect? I've seen where some of you explained this procedure, and I haven't done this quite exactly like it has been described here. I only have one adjustment on this carb and I'm assuming that it is the slow speed or idle aadjustment

 

[dwest]

Re: engine will not plane boat w/o choking

I had a similar problem with the same carburetor. Unfortunatley, I would suggest taking the carb off again and make sure everything is clean. I inadvetently fouled a fresh rebuild reconnecting the old fuel supply line.