yamaha 175 hp

[burliosully]

Why can't I find any posts on yamaha 175TLRG out boards? Carbs are leaking and I've tried EVERYTHING. Does any one know this engine?

 

[burliosully]

Re: yamaha 175 hp

I've checked compression on all cyls. rebuilt all six carbs twice and used separate gas source and carbs still spill gas out under power.

 

[cousinabe]

Re: yamaha 175 hp

did you adjust the floats according to spec?

 

[burliosully]

Re: yamaha 175 hp

the first rebuild on the caebs was done by a shop the other me. It's possible I didn't do it properly but same issue after six rebuilds?

 

[burliosully]

Re: yamaha 175 hp

just went down to start the boat after it died on me yesterday. The boat used to start fine but starve for gas as it was always spilling out one of the carbs. pump the bulb and it ran fine stop pumping and it would die. This morning it would not start at all. seems like it is not getting any gas even when choked.

 

[99yam40]

Re: yamaha 175 hp

sounds like fuel pump problems if you had to pump bulb,

if fuel runs out of carbs when you pump primer bulb or when running you have a problem with the float hung up, bad float, or not adjusted properly
or bad needle and seat, trash in between needle and seat.

Hope you have a manual to help you adjust everything when you reinstall carbs

 

[burliosully]

Re: yamaha 175 hp

Is it possible the fuel pump sent too great a volume of gas for the carbs to handle?

 

[99yam40]

Re: yamaha 175 hp

no, the float just stops the flow with the needle and seat

 

[burliosully]

Re: yamaha 175 hp

Thank you all!!!

Fuel pump diaphram tear in both pumps

replaced and running fine now