1987 Pro V 150 Yamaha

[mikesfreetime]

My Prov will not idle. I have replaced the fuel pumps and rebuilt the carbs. I changed the gas with fresh, changed plugs. It will run when idled up but will not idle at all. I have adjusted the 1 jet I see on the carb. Am I missing something>?

 

[WillyBWright]

Re: 1987 Pro V 150 Yamaha

Welcome to iboats. <br /><br />Have you checked cylinder compressions? Are you getting water on any of the sparkplugs? Maybe a bad cylinder, may be a bad head gasket. Maybe a buncha other things including no spark on a cylinder or two.

 

[mikesfreetime]

Re: 1987 Pro V 150 Yamaha

I have not checked cylinder compression, will tomorrow. I did think i saw some water on the plugs, what would that mean.

 

[mikesfreetime]

Re: 1987 Pro V 150 Yamaha

I have checked compression and they are all the same so thats not the issue. I have found one thing if I pull the front cover off the carbs and manually give it a partial choke it will run and idle. The bottom carb seems not to be getting gas like it should. I have rebuilt them. Any Suggestions?

 

[andy6374]

Re: 1987 Pro V 150 Yamaha

If you choke em' and it runs then your carbs are dirty. You are bypassing the carbs.<br /><br />If you pump the primer bulb and it runs then your fuel pumps needs a rebuild. By pumping the primer bulb you are bypassing the fuel pump.

 

[mikesfreetime]

Re: 1987 Pro V 150 Yamaha

I have just rebuilt the carbs. Thouroughly cleaned. The bottom carb I removed again and verified it was clean. Also I have just installed BRAND new pumps.

 

[mikesfreetime]

Re: 1987 Pro V 150 Yamaha

Also, is there a idle valve or setting in the carb? Maybe thats my issue?

 

[Ray Neudecker]

Re: 1987 Pro V 150 Yamaha

There is a float valve setting required. After over fourty years of dealing with outboard carbs, I have still not been trained well enough to look at a carb and determine the inner passages are clean. Many people seem to think if the bowl is clean that the carb is fine. My experience says this isn't so.

 

[mikesfreetime]

Re: 1987 Pro V 150 Yamaha

I had another guy speak of the inner passages. I have ordered some carborator soak. I will pull the carbs back apart and let them soak this time. Maybe that will clean the inner passages.

 

[rodbolt]

Re: 1987 Pro V 150 Yamaha

on the bottom of the fuel bowls is a brass screw, remove it and DO NOT lose the gasket as they are not in the kit.<br /> this allows acess to the idle fuel jets, I try NOT to remove them as they like to snap off. however I will take a single strand of copper wire and clean the passages. be careful how long ya soak the carb bodies as they have some rubber and plastic parts that can be affected.<br />the bowls you can soak as long as needed.

 

[mikesfreetime]

Re: 1987 Pro V 150 Yamaha

I will definitly try that.